mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-12-23 19:25:37 -05:00
Update wsprcpm simulator and decoder.
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@8603 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
This commit is contained in:
Steven Franke
parent
396aab7274
commit
1f9d73963b
@ -15,20 +15,23 @@ subroutine genwsprcpm(msg,msgsent,itone)
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integer icw(ND)
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integer id(NS+ND)
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integer jd(NS+ND)
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integer ipreamble(32) !Long sync vector
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integer isync(32) !Long sync vector
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integer ipreamble(16) !Freq estimation preamble
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integer isync(200) !Long sync vector
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integer itone(NN)
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integer*8 n8
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data ipreamble/1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1/
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data ipreamble/1,1,1,1,0,0,0,0,0,0,0,0,1,1,1,1/
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data first/.true./
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data iuniqueword0/z'30C9E8AD'/
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save first,isync,ipreamble
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if(first) then
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write(sbits,'(b32.32)') iuniqueword0
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read(sbits,'(32i1)') isync
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ipreamble=2*ipreamble-1
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isync=2*isync-1
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read(sbits,'(32i1)') isync(1:32)
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read(sbits,'(32i1)') isync(33:64)
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read(sbits,'(32i1)') isync(65:96)
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read(sbits,'(32i1)') isync(97:128)
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read(sbits,'(32i1)') isync(129:160)
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read(sbits,'(32i1)') isync(161:192)
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read(sbits,'(8i1)') isync(193:200)
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first=.false.
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endif
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@ -52,17 +55,16 @@ write(*,'(a6,b16.16)') 'icrc: ',icrc
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write(*,'(50i1,1x,14i1,1x,4i1)') msgbits
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call encode204(msgbits,codeword) !Encode the test message
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icw=2*codeword - 1 !NRZ codeword
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! Message structure:
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! s32 d200 p32
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itone(1:32)=isync
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itone(33:232)=icw
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itone(233:264)=ipreamble
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! do i=1,264
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! write(*,*) i,itone(i)
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! enddo
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! d100 p16 d100
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itone(1:100)=isync(1:100)+2*codeword(1:100)
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itone(101:116)=ipreamble+1
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itone(117:216)=isync(101:200)+2*codeword(101:200)
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itone=2*itone-3
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do i=1,216
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write(*,*) i,itone(i)
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enddo
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return
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end subroutine genwsprcpm
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@ -1,11 +1,11 @@
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parameter (KK=64) !Information bits (50 + CRC14) ?
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parameter (ND=200) !Data symbols: LDPC (204,68), r=1/3, don't send last 4 bits
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parameter (NS=64) !Sync symbols (2x32)
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parameter (NN=NS+ND) !Total symbols (264)
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parameter (NS=16) !Sync symbols (16)
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parameter (NN=NS+ND) !Total symbols (216)
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parameter (NSPS0=5300) !Samples per symbol at 12000 S/s
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parameter (NSPS0=6400) !Samples per symbol at 12000 S/s
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parameter (NDOWN=53) !Downsample to 100 samples per symbol...
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parameter (NDOWN=32) !Downsample to 200 sa/symbol (375 Hz) for candidate selection
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parameter (NSPS=NSPS0/NDOWN) !Samples per symbol
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parameter (NZ=NSPS*NN) !Samples in baseband waveform
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@ -1,4 +1,4 @@
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subroutine wsprcpm_wav(baud,xdt,h1,h2,f0,itone,snrdb,iwave)
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subroutine wsprcpm_wav(baud,xdt,h,f0,itone,snrdb,iwave)
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! Generate iwave() from itone().
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@ -23,23 +23,10 @@ subroutine wsprcpm_wav(baud,xdt,h1,h2,f0,itone,snrdb,iwave)
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sig=1.0
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endif
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dphi01=twopi*(f0-(h1/2.0d0)*baud)*dt
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dphi11=twopi*(f0+(h1/2.0d0)*baud)*dt
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dphi02=twopi*(f0-(h2/2.0d0)*baud)*dt
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dphi12=twopi*(f0+(h2/2.0d0)*baud)*dt
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phi=0.d0
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k=nint(xdt/dt)
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do j=1,NN
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if( mod(j,2).eq.0 ) then
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dphi0=dphi01
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dphi1=dphi11
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else
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dphi0=dphi02
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dphi1=dphi12
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endif
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dphi=dphi0
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if(itone(j).eq.1) dphi=dphi1
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if(k.eq.0) phi=-dphi
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dphi=twopi*(f0+itone(j)*(h/2.0d0)*baud)*dt
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do i=1,NSPS0
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k=k+1
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phi=phi+dphi
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@ -4,136 +4,89 @@ program wsprcpmd
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! WSPRCPM is a WSPR-like mode based on full-response CPM.
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!
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! Modulation Capabilities include:
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! support for multi-h cpm with two modulation indexes: [h1,h2].
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! h1,h2 (modulation index) are variable; h1=h2=0.5 is MSK, h1=h2=1.0 is standard
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! fsk intended for noncoherent demodulation.
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! demodulator uses noncoherent sequence detection with variable window size.
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! symbol demodulation is done symbol-by-symbol - each symbol is
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! estimated using a data frame comprising N symbol intervals, where N can
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! be 1, 3, 5, 7, 9, 11. The central symbol is estimated and then the window
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! is stepped forward by one symbol.
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! soft symbols are decoded by log-domain belief propagation followed by ordered-
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! statistics decoding.
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!
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! Currently configured to use (204,68) r=1/3 LDPC code, regular column weight 3.
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! 50 data bits + 14 bit CRC + 4 "0" bits. The 4 "0" bits are unused bits that
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! are not transmitted. At the decoder, these bits are treated as "AP" bits.
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! This shortens the code to (200,64) r=0.32, slightly decreasing the code rate.
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!
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! Frame format is:
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! s32 d200 p32 (264) channel symbols
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! d100 p32 d100 (232) channel symbols
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!
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use crc
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include 'wsprcpm_params.f90'
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parameter(NMAX=120*12000)
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character arg*8,message*22,cbits*50,infile*80,fname*16,datetime*11
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character*22 decodes(100)
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character*120 data_dir
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character*32 uwbits
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character*68 dmsg
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complex csync(0:32*100-1) !Sync symbols only, from cbb
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complex cpreamble(0:32*100-1) !Sync symbols only, from cbb
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complex cp2(0:32*100-1)
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complex ctwks(0:32*100-1)
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complex ctwkp(0:32*100-1)
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complex c2(0:120*12000/53-1) !Complex waveform
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complex ctmp(0:4*32*100-1)
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complex cframe(0:264*100-1) !Complex waveform
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complex cd(0:264*100-1) !Complex waveform
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complex c1(0:9,1:2),c0(0:9,1:2)
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complex ccor(0:1,264)
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complex csum,cp(0:1,1:2),cterm
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complex ccohs(0:31)
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complex ccohp(0:31)
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complex c2(0:120*12000/32-1) !Complex waveform
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complex cframe(0:216*200-1) !Complex waveform
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complex cd(0:216*10-1) !Complex waveform
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complex c1(0:9,0:1),c0(0:9,0:1)
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complex ccor(0:1,216)
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complex csum,cterm
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real*8 fMHz
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real rxdata(ND),llr(204) !Soft symbols
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real sbits(264),sbits1(264),sbits3(264)
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real sbits(216),sbits1(216),sbits3(216)
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real ps(0:8191),psbest(0:8191)
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real candidates(100,2)
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integer iuniqueword0
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integer isync(32) !Unique word
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integer ipreamble(32) !Preamble vector
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integer isync(200) !Unique word
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integer isync2(216)
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integer ipreamble(16) !Preamble vector
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integer ihdr(11)
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integer*2 iwave(NMAX) !Generated full-length waveform
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integer*1,target :: idat(9)
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integer*1 decoded(68),apmask(204),cw(204)
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integer*1 hbits(264),hbits1(264),hbits3(264)
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data ipreamble/1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1/
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integer*1 hbits(216),hbits1(216),hbits3(216)
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data ipreamble/1,1,1,1,0,0,0,0,0,0,0,0,1,1,1,1/
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data iuniqueword0/z'30C9E8AD'/
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write(uwbits,'(b32.32)') iuniqueword0
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read(uwbits,'(32i1)') isync
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ipreamble=2*ipreamble-1
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isync=2*isync-1
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read(uwbits,'(32i1)') isync(1:32)
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read(uwbits,'(32i1)') isync(33:64)
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read(uwbits,'(32i1)') isync(65:96)
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read(uwbits,'(32i1)') isync(97:128)
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read(uwbits,'(32i1)') isync(129:160)
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read(uwbits,'(32i1)') isync(161:192)
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read(uwbits,'(8i1)') isync(193:200)
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fs=12000.0/NDOWN !Sample rate
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dt=1.0/fs !Sample interval (s)
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tt=NSPS*dt !Duration of "itone" symbols (s)
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baud=1.0/tt !Keying rate for "itone" symbols (baud)
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txt=NZ*dt !Transmission length (s)
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h1=0.80 !h=0.8 seems to be optimum for AWGN sensitivity (not for fading)
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h2=0.80
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h=1.00 !h=0.8 seems to be optimum for AWGN sensitivity (not for fading)
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twopi=8.0*atan(1.0)
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dphi11=twopi*baud*(h1/2.0)*dt
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dphi01=-twopi*baud*(h1/2.0)*dt
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dphi12=twopi*baud*(h2/2.0)*dt
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dphi02=-twopi*baud*(h2/2.0)*dt
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k=0
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phi=0.0
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do i=1,32
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if( mod(i,2) .eq. 0 ) then
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dphi1=dphi11
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dphi0=dphi01
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else
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dphi1=dphi12
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dphi0=dphi02
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endif
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dphi=dphi0
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if( isync(i) .eq. 1 ) dphi=dphi1
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do j=1,100
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phi=mod(phi+dphi,twopi)
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csync(k)=cmplx(cos(phi),sin(phi))
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k=k+1
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enddo
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enddo
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k=0
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phi=0.0
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do i=1,32
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if( mod(i,2) .eq. 0 ) then
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dphi1=dphi11
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dphi0=dphi01
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else
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dphi1=dphi12
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dphi0=dphi02
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endif
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dphi=dphi0
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if( ipreamble(i) .eq. 1 ) dphi=dphi1
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do j=1,100
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phi=mod(phi+dphi,twopi)
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cpreamble(k)=cmplx(cos(phi),sin(phi))
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k=k+1
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enddo
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enddo
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isync2(1:100)=isync(1:100)
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isync2(101:104)=0 ! This is *not* backwards.
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isync2(105:112)=1
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isync2(113:116)=0
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isync2(117:216)=isync(101:200)
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dphi1=twopi*baud*(h1/2.0)*dt*10 ! dt*10 is samp interval after downsample
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dphi2=twopi*baud*(h2/2.0)*dt*10 ! dt*10 is samp interval after downsample
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cp(1,1)=cmplx(cos(dphi1*10),sin(dphi1*10))
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cp(0,1)=conjg(cp(1,1))
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cp(1,2)=cmplx(cos(dphi2*10),sin(dphi2*10))
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cp(0,2)=conjg(cp(1,2))
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do j=1,2
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if( j.eq.1 ) then
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dphi=dphi1
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! data sync tone
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! 0 0 0
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! 0 1 1
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! 1 0 2
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! 1 1 3
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dphi=twopi*baud*(h/2.0)*dt*20 ! dt*10 is samp interval after downsample
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do j=0,1
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if(j.eq.0) then
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dphi0=-3*dphi
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dphi1=+1*dphi
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else
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dphi=dphi2
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dphi0=-1*dphi
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dphi1=+3*dphi
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endif
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phi0=0.0
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phi1=0.0
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do i=0,9
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c1(i,j)=cmplx(cos(phi1),sin(phi1))
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c0(i,j)=cmplx(cos(phi0),sin(phi0))
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phi1=mod(phi1+dphi,twopi)
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phi0=mod(phi0-dphi,twopi)
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phi1=mod(phi1+dphi1,twopi)
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phi0=mod(phi0+dphi0,twopi)
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enddo
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enddo
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@ -156,14 +109,14 @@ program wsprcpmd
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iarg=iarg+2
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endif
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ncoh=1
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npdi=32
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npdi=16
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if(arg(1:2).eq.'-c') then
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call getarg(iarg+1,arg)
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read(arg,*) ncoh
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iarg=iarg+2
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npdi=32/ncoh
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npdi=16/ncoh
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endif
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write(*,*) 'ncoh: ',ncoh,' npdi: ',npdi
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! write(*,*) 'ncoh: ',ncoh,' npdi: ',npdi
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open(13,file=trim(data_dir)//'/ALL_WSPR.TXT',status='unknown', &
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position='append')
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@ -197,123 +150,43 @@ program wsprcpmd
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fa=-100.0
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fb=100.0
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fs=12000.0/53.0
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npts=120*12000/53
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nsync=32
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call getcandidate2(c2,npts,fs,fa,fb,fc1,xsnr) !First approx for freq
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fcest=fc1
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do iii=1,2
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izero=226
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dphi=twopi*fcest*dt
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ctwks=cmplx(0.0,0.0)
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ctwkp=cmplx(0.0,0.0)
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phi=0
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do i=0,nsync*NSPS-1
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phi=mod(phi+dphi,twopi)
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ctwks(i)=csync(i)*cmplx(cos(phi),sin(phi))
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ctwkp(i)=cpreamble(i)*cmplx(cos(phi),sin(phi))
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enddo
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imax=100
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xcmax=-1e32
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do it = -imax,imax
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its=izero+it
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ccohs=0.0
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do k=0,npdi-1
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is=k*ncoh*nsps
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ccohs(k)=sum(c2(its+is:its+is+ncoh*nsps-1)*conjg(ctwks(is:is+ncoh*nsps-1)))
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ccohs(k)=ccohs(k)/(ncoh*nsps)
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enddo
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! term1=sum(abs(ccohs(0:npdi-1))**2)
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itp=izero+it+232*100
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ccohp=0.0
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do k=0,npdi-1
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is=k*ncoh*nsps
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ccohp(k)=sum(c2(itp+is:itp+is+ncoh*nsps-1)*conjg(ctwkp(is:is+ncoh*nsps-1)))
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ccohp(k)=ccohp(k)/(ncoh*nsps)
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enddo
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csum=0.0
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terms=0.0
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do n=1,npdi-1
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do k=n,npdi-1
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csum=csum+ccohs(k)*conjg(ccohs(k-n))
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enddo
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terms=terms+abs(csum)
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enddo
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csum=0.0
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termp=0.0
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do n=1,npdi-1
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do k=n,npdi-1
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csum=csum+ccohp(k)*conjg(ccohp(k-n))
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enddo
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termp=termp+abs(csum)
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enddo
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!write(23,*) it,terms,termp
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xmetric=sqrt(terms*termp)
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if( xmetric .gt. xcmax ) then
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xcmax=xmetric
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ibestt=it
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fs=12000.0/32.0
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npts=120*12000.0/32.0
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nsync=16
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call getcandidate2(c2,npts,fs,fa,fb,ncand,candidates) !First approx for freq
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ndecodes=0
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do icand=1,ncand
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fc0=candidates(icand,1)
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xsnr=candidates(icand,2)
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xmax=-1e32
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do i=-5,5
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ft=fc0+i*0.2
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call noncoherent_frame_sync(c2,ft,isync2,is,xf1)
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if(xf1.gt.xmax) then
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xmax=xf1
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fc1=ft
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is0=is
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endif
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enddo
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call coherent_preamble_fsync(c2,ipreamble,nsync,NSPS,is0,fc1,fcest,xp1)
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call noncoherent_frame_sync(c2,fcest,isync2,istart,xf2)
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write(*,'(i5,i5,i5,4(f11.5,2x))') ifile,iii,istart,fc0,fc1,fcest
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istart=izero+ibestt
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if(iii .eq. 2) goto 887
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ctmp=0.0
|
||||
ctmp(0:32*100-1)=c2(istart+232*100:istart+264*100-1)*conjg(ctwkp)
|
||||
call four2a(ctmp,4*32*100,1,-1,1) !c2c FFT to freq domain
|
||||
xmax=0.0
|
||||
ctmp=cshift(ctmp,-200)
|
||||
do i=150,250
|
||||
xa=abs(ctmp(i))
|
||||
if(xa.gt.xmax) then
|
||||
ishift=i
|
||||
xmax=xa
|
||||
endif
|
||||
enddo
|
||||
dfp=1/(4*5300.0/12000.0*32)
|
||||
delta=(ishift-200)*dfp
|
||||
! need to add bounds protection
|
||||
xm1=abs(ctmp(ishift-1))
|
||||
x0=abs(ctmp(ishift))
|
||||
xp1=abs(ctmp(ishift+1))
|
||||
xint=(log(xm1)-log(xp1))/(log(xm1)+log(xp1)-2*log(x0))
|
||||
delta2=delta+xint*dfp/2.0
|
||||
fcest=fcest+delta2
|
||||
enddo
|
||||
|
||||
887 write(*,'(i4,i5,5(2x,f9.5))') ifile,istart,xcmax,fc1,fcest
|
||||
xdt=(istart-226)/100.0
|
||||
if(abs(xdt).le.0.1) ngood=ngood+1
|
||||
xs1=xs1+xdt
|
||||
xs2=xs2+xdt**2
|
||||
fr1=fr1+fc1
|
||||
fr2=fr2+fc1**2
|
||||
nav=nav+1
|
||||
!**************
|
||||
! fcest=0.0
|
||||
! istart=226
|
||||
|
||||
do ijitter=0,2
|
||||
io=ijitter
|
||||
if(ijitter.eq.2) io=-1
|
||||
cframe=c2(istart+io:istart+io+264*100-1)
|
||||
do ijitter=0,4
|
||||
io=-10*(ijitter/2+1)
|
||||
if(mod(ijitter,2).eq.0) io=10*(ijitter/2)
|
||||
ib=max(0,istart+io)
|
||||
cframe=c2(ib:ib+216*200-1)
|
||||
call downsample2(cframe,fcest,cd)
|
||||
|
||||
dts=10*dt
|
||||
s2=sum(cd*conjg(cd))/(10*264)
|
||||
s2=sum(cd*conjg(cd))/(10*216)
|
||||
cd=cd/sqrt(s2)
|
||||
|
||||
do nseq=1,7
|
||||
if( nseq.eq.1 ) then ! noncoherent single-symbol detection
|
||||
sbits1=0.0
|
||||
do ibit=1,264
|
||||
if( mod(ibit,2).eq.0 ) j=1
|
||||
if( mod(ibit,2).eq.1 ) j=2
|
||||
do ibit=1,216
|
||||
j=isync2(ibit)
|
||||
ib=(ibit-1)*10
|
||||
ccor(1,ibit)=sum(cd(ib:ib+9)*conjg(c1(0:9,j)))
|
||||
ccor(0,ibit)=sum(cd(ib:ib+9)*conjg(c0(0:9,j)))
|
||||
@ -334,19 +207,17 @@ do ijitter=0,2
|
||||
if( nseq.eq. 6 ) nbit=11
|
||||
if( nseq.eq. 7 ) nbit=13
|
||||
numseq=2**(nbit)
|
||||
do ibit=nbit/2+1,264-nbit/2
|
||||
do ibit=nbit/2+1,216-nbit/2
|
||||
ps=0.0
|
||||
pmax=0.0
|
||||
do iseq=0,numseq-1
|
||||
csum=0.0
|
||||
cterm=cmplx(1.0,0.0)
|
||||
cterm=1.0
|
||||
k=1
|
||||
do i=nbit-1,0,-1
|
||||
ibb=iand(iseq/(2**i),1)
|
||||
csum=csum+ccor(ibb,ibit-(nbit/2+1)+k)*cterm
|
||||
if( mod(ibit-(nbit/2+1)+k,2) .eq. 0 ) j=1
|
||||
if( mod(ibit-(nbit/2+1)+k,2) .eq. 1 ) j=2
|
||||
cterm=cterm*conjg(cp(ibb,j))
|
||||
cterm=-cterm
|
||||
k=k+1
|
||||
enddo
|
||||
ps(iseq)=abs(csum)
|
||||
@ -366,7 +237,8 @@ do ijitter=0,2
|
||||
sbits=sbits3
|
||||
hbits=hbits3
|
||||
endif
|
||||
rxdata(1:200)=sbits(33:232)
|
||||
rxdata(1:100)=sbits(1:100)
|
||||
rxdata(101:200)=sbits(117:216);
|
||||
rxav=sum(rxdata(1:200))/200.0
|
||||
rx2av=sum(rxdata(1:200)*rxdata(1:200))/200.0
|
||||
rxsig=sqrt(rx2av-rxav*rxav)
|
||||
@ -401,6 +273,13 @@ do ijitter=0,2
|
||||
1202 format(8b8,b4)
|
||||
idat(7)=ishft(idat(7),6)
|
||||
call wqdecode(idat,message,itype)
|
||||
idupe=0
|
||||
do i=1,ndecodes
|
||||
if(decodes(i).eq.message) idupe=1
|
||||
enddo
|
||||
if(idupe.eq.1) goto 888
|
||||
ndecodes=ndecodes+1
|
||||
decodes(ndecodes)=message
|
||||
nsnr=nint(xsnr)
|
||||
freq=fMHz + 1.d-6*(fc1+fbest)
|
||||
nfdot=0
|
||||
@ -413,23 +292,138 @@ do ijitter=0,2
|
||||
enddo ! nseq
|
||||
enddo !jitter
|
||||
888 continue
|
||||
enddo !candidate list
|
||||
enddo !files
|
||||
|
||||
avshift=xs1/nav
|
||||
varshift=xs2/nav
|
||||
stdshift=sqrt(varshift-avshift**2)
|
||||
avfr=fr1/nav
|
||||
varfr=fr2/nav
|
||||
stdfr=sqrt(varfr-avfr**2)
|
||||
write(*,*) 'ngood: ',ngood
|
||||
write(*,'(a7,f7.3,f7.3)') 'shift: ',avshift,stdshift
|
||||
write(*,*) 'freq: ',avfr,stdfr
|
||||
|
||||
write(*,1120)
|
||||
1120 format("<DecodeFinished>")
|
||||
|
||||
999 end program wsprcpmd
|
||||
|
||||
|
||||
subroutine coherent_preamble_fsync(c2,ipreamble,nsync,nsps,istart,fc0,fc1,xmax)
|
||||
complex c2(0:120*12000/32-1)
|
||||
complex cpreamble(0:16*200-1)
|
||||
complex ctmp1(0:4*16*200-1)
|
||||
complex ctwkp(0:16*200-1)
|
||||
complex ccohp(0:15)
|
||||
integer ipreamble(nsync)
|
||||
logical first/.true./
|
||||
save dt,first,h,twopi,cpreamble
|
||||
|
||||
if(first) then
|
||||
baud=12000.0/6400.0
|
||||
dt=32.0/12000.0
|
||||
h=1.00
|
||||
twopi=8.0*atan(1.0)
|
||||
k=0
|
||||
phi=0.0
|
||||
dphi=twopi*baud*0.5*h*dt
|
||||
do i=1,16
|
||||
dp=dphi
|
||||
if(ipreamble(i).eq.0) dp=-dphi
|
||||
do j=1,200
|
||||
cpreamble(k)=cmplx(cos(phi),sin(phi))
|
||||
phi=mod(phi+dp,twopi)
|
||||
k=k+1
|
||||
enddo
|
||||
enddo
|
||||
first=.false.
|
||||
endif
|
||||
|
||||
dphi=twopi*fc0*dt
|
||||
ctwkp=cmplx(0.0,0.0)
|
||||
phi=0
|
||||
do i=0,nsync*nsps-1
|
||||
ctwkp(i)=cpreamble(i)*cmplx(cos(phi),sin(phi))
|
||||
phi=mod(phi+dphi,twopi)
|
||||
enddo
|
||||
ipstart=istart+100*200
|
||||
ctmp1=0.0
|
||||
ctmp1(0:16*200-1)=c2(ipstart:ipstart+16*200-1)*conjg(ctwkp)
|
||||
call four2a(ctmp1,4*16*200,1,-1,1) !c2c FFT to freq domain
|
||||
xmax=0.0
|
||||
ctmp1=cshift(ctmp1,-200)
|
||||
dfp=1/(4*6400.0/12000.0*16)
|
||||
do i=150,250
|
||||
xa=abs(ctmp1(i))
|
||||
if(xa.gt.xmax) then
|
||||
ishift=i
|
||||
xmax=xa
|
||||
endif
|
||||
enddo
|
||||
delta=(ishift-200)*dfp
|
||||
xm1=abs(ctmp1(ishift-1))
|
||||
x0=abs(ctmp1(ishift))
|
||||
xp1=abs(ctmp1(ishift+1))
|
||||
xint=(log(xm1)-log(xp1))/(log(xm1)+log(xp1)-2*log(x0))
|
||||
delta2=delta+xint*dfp/2.0
|
||||
fc1=fc0+delta2
|
||||
return
|
||||
end subroutine coherent_preamble_fsync
|
||||
|
||||
|
||||
subroutine noncoherent_frame_sync(c2,fc,isync2,istart,ssmax)
|
||||
complex c2(0:120*12000/32-1)
|
||||
complex ct0(0:199),ct1(0:199),ct2(0:199),ct3(0:199)
|
||||
integer isync2(216)
|
||||
|
||||
twopi=8.0*atan(1.0)
|
||||
h=1.0
|
||||
dt=32.0/12000.0
|
||||
baud=12000.0/6400.0
|
||||
imax=370 ! defines dt search range (375 samples/s)
|
||||
ssmax=-1e32
|
||||
izero=375
|
||||
do it = -imax,imax,10
|
||||
! noncoherent wspr-type dt estimation
|
||||
dp0=twopi*(fc-1.5*h*baud)*dt
|
||||
dp1=twopi*(fc-0.5*h*baud)*dt
|
||||
dp2=twopi*(fc+0.5*h*baud)*dt
|
||||
dp3=twopi*(fc+1.5*h*baud)*dt
|
||||
th0=0.0
|
||||
th1=0.0
|
||||
th2=0.0
|
||||
th3=0.0
|
||||
do i=0,199
|
||||
ct0(i)=cmplx(cos(th0),sin(th0))
|
||||
ct1(i)=cmplx(cos(th1),sin(th1))
|
||||
ct2(i)=cmplx(cos(th2),sin(th2))
|
||||
ct3(i)=cmplx(cos(th3),sin(th3))
|
||||
th0=mod(th0+dp0,twopi)
|
||||
th1=mod(th1+dp1,twopi)
|
||||
th2=mod(th2+dp2,twopi)
|
||||
th3=mod(th3+dp3,twopi)
|
||||
enddo
|
||||
ss=0.0
|
||||
totp=0.0
|
||||
do is=1,216
|
||||
i0=izero+it+(is-1)*200
|
||||
p0=abs(sum(c2(i0:i0+199)*conjg(ct0)))
|
||||
p1=abs(sum(c2(i0:i0+199)*conjg(ct1)))
|
||||
p2=abs(sum(c2(i0:i0+199)*conjg(ct2)))
|
||||
p3=abs(sum(c2(i0:i0+199)*conjg(ct3)))
|
||||
p0=sqrt(p0)
|
||||
p1=sqrt(p1)
|
||||
p2=sqrt(p2)
|
||||
p3=sqrt(p3)
|
||||
|
||||
totp=totp+p0+p1+p2+p3
|
||||
! cmet=(p1+p3)-(p0+p2)
|
||||
cmet=max(p1,p3)-max(p0,p2) ! This works better near threshold SNR
|
||||
if(isync2(is).eq.0) ss=ss-cmet
|
||||
if(isync2(is).eq.1) ss=ss+cmet
|
||||
enddo
|
||||
ss=ss/totp
|
||||
if(ss.gt.ssmax) then
|
||||
ioffset=it
|
||||
ssmax=ss
|
||||
endif
|
||||
enddo
|
||||
istart=izero+ioffset
|
||||
return
|
||||
end subroutine noncoherent_frame_sync
|
||||
|
||||
subroutine getmetric2(ib,ps,ns,xmet)
|
||||
real ps(0:ns-1)
|
||||
xm1=0
|
||||
@ -443,10 +437,10 @@ subroutine getmetric2(ib,ps,ns,xmet)
|
||||
end subroutine getmetric2
|
||||
|
||||
subroutine downsample2(ci,f0,co)
|
||||
parameter(NI=264*100,NH=NI/2,NO=NI/10) ! downsample from 100 samples per symbol to 10
|
||||
parameter(NI=216*200,NH=NI/2,NO=NI/20) ! downsample from 200 samples per symbol to 10
|
||||
complex ci(0:NI-1),ct(0:NI-1)
|
||||
complex co(0:NO-1)
|
||||
fs=12000.0/53.0
|
||||
fs=12000.0/32.0
|
||||
df=fs/NI
|
||||
ct=ci
|
||||
call four2a(ct,NI,1,-1,1) !c2c FFT to freq domain
|
||||
@ -454,14 +448,10 @@ subroutine downsample2(ci,f0,co)
|
||||
ct=cshift(ct,i0)
|
||||
co=0.0
|
||||
co(0)=ct(0)
|
||||
! b=3.4*0.875/0.715
|
||||
! b=2.6*0.5625/0.715
|
||||
b=12.0
|
||||
b=8.0
|
||||
do i=1,NO/2
|
||||
arg=(i*df/b)**2
|
||||
filt=exp(-arg)
|
||||
! filt=0.0
|
||||
! if( i*df .le. b ) filt=1.0
|
||||
co(i)=ct(i)*filt
|
||||
co(NO-i)=ct(NI-i)*filt
|
||||
enddo
|
||||
@ -470,72 +460,62 @@ subroutine downsample2(ci,f0,co)
|
||||
return
|
||||
end subroutine downsample2
|
||||
|
||||
subroutine getcandidate2(c,npts,fs,fa,fb,fc1,xsnr)
|
||||
parameter(NDAT=100,NFFT1=8*NDAT,NH1=NFFT1/2)
|
||||
subroutine getcandidate2(c,npts,fs,fa,fb,ncand,candidates)
|
||||
parameter(NDAT=200,NFFT1=120*12000/32,NH1=NFFT1/2,NFFT2=120*12000/320,NH2=NFFT2/2)
|
||||
complex c(0:npts-1) !Complex waveform
|
||||
complex cc(0:NFFT1-1)
|
||||
complex csfil(0:NFFT2-1)
|
||||
complex cwork(0:NFFT2-1)
|
||||
real bigspec(0:NFFT2-1)
|
||||
complex c2(0:NFFT1-1) !Short spectra
|
||||
real s(-NH1+1:NH1) !Coarse spectrum
|
||||
real ss(-NH1+1:NH1) !Smoothed coarse spectrum
|
||||
real w(0:NFFT1-1)
|
||||
real pi
|
||||
real candidates(100,2)
|
||||
integer indx(NFFT2-1)
|
||||
logical first
|
||||
data first/.true./
|
||||
save first,w
|
||||
save first,w,df,csfil
|
||||
|
||||
if(first) then
|
||||
pi=4.0*atan(1.0)
|
||||
do i=0,NFFT1-1
|
||||
w(i)=sin(pi*i/(NDAT-1))**2
|
||||
df=10*fs/NFFT1
|
||||
csfil=cmplx(0.0,0.0)
|
||||
do i=0,NFFT2-1
|
||||
csfil(i)=exp(-((i-NH2)/20.0)**2)
|
||||
enddo
|
||||
csfil=cshift(csfil,NH2)
|
||||
call four2a(csfil,NFFT2,1,-1,1)
|
||||
first=.false.
|
||||
endif
|
||||
|
||||
nspec=int((npts-NFFT1)/NDAT)+1
|
||||
df1=fs/NFFT1
|
||||
s=0.
|
||||
do k=1,nspec
|
||||
ia=(k-1)*NDAT
|
||||
ib=ia+NFFT1-1
|
||||
c2(0:NFFT1-1)=c(ia:ib)*w
|
||||
call four2a(c2,NFFT1,1,-1,1)
|
||||
do i=0,NFFT1-1
|
||||
j=i
|
||||
if(j.gt.NH1) j=j-NFFT1
|
||||
s(j)=s(j) + real(c2(i))**2 + aimag(c2(i))**2
|
||||
enddo
|
||||
enddo
|
||||
do i=-NH1+1+4,NH1-4
|
||||
ss(i)=sum(s(i-4:i+4))/9.0
|
||||
enddo
|
||||
! do i=-NH1+1+8,NH1-8
|
||||
! ss(i)=sum(ss(i-4:i+4))/9.0
|
||||
! enddo
|
||||
do i=-20,20
|
||||
write(52,*) i*df1,ss(i)
|
||||
enddo
|
||||
|
||||
smax=0.
|
||||
ipk=0
|
||||
fc1=0.
|
||||
ia=nint(fa/df1)
|
||||
ib=nint(fb/df1)
|
||||
do i=ia,ib
|
||||
f=i*df1
|
||||
if(ss(i).gt.smax) then
|
||||
smax=ss(i)
|
||||
ipk=i
|
||||
fc1=f
|
||||
endif
|
||||
enddo
|
||||
cc=cmplx(0.0,0.0)
|
||||
cc(0:npts-1)=c;
|
||||
call four2a(cc,NFFT1,1,-1,1)
|
||||
cc=abs(cc)**2
|
||||
call four2a(cc,NFFT1,1,-1,1)
|
||||
cwork(0:NH2)=cc(0:NH2)*conjg(csfil(0:NH2))
|
||||
cwork(NH2+1:NFFT2-1)=cc(NFFT1-NH2+1:NFFT1-1)*conjg(csfil(NH2+1:NFFT2-1))
|
||||
|
||||
xint=(log(ss(ipk-1))-log(ss(ipk+1)))/(log(ss(ipk-1))+log(ss(ipk+1))-2*log(ss(ipk)))
|
||||
fc1=fc1+xint*df1/2.0
|
||||
! The following is for testing SNR calibration:
|
||||
sp3n=sum(s(ipk-5:ipk+5))
|
||||
base=(sum(s)-sp3n)/(NFFT1-11.0)
|
||||
psig=sp3n-11*base
|
||||
pnoise=(2500.0/df1)*base
|
||||
xsnr=db(psig/pnoise)
|
||||
call four2a(cwork,NFFT2,1,+1,1)
|
||||
bigspec=cshift(real(cwork),-NH2)
|
||||
il=NH2+fa/df
|
||||
ih=NH2+fb/df
|
||||
nnl=ih-il+1
|
||||
call indexx(bigspec(il:il+nnl-1),nnl,indx)
|
||||
xn=bigspec(il-1+indx(nint(0.3*nnl)))
|
||||
bigspec=bigspec/xn
|
||||
ncand=0
|
||||
do i=il,ih
|
||||
if((bigspec(i).gt.bigspec(i-1)).and. &
|
||||
(bigspec(i).gt.bigspec(i+1)).and. &
|
||||
(bigspec(i).gt.1.15).and.ncand.lt.100) then
|
||||
ncand=ncand+1
|
||||
candidates(ncand,1)=df*(i-NH2)
|
||||
candidates(ncand,2)=10*log10(bigspec(i))-30.0
|
||||
endif
|
||||
enddo
|
||||
! do i=1,ncand
|
||||
! write(*,*) i,candidates(i,1),candidates(i,2)
|
||||
! enddo
|
||||
return
|
||||
end subroutine getcandidate2
|
||||
|
||||
@ -545,9 +525,9 @@ subroutine wsprcpm_downsample(iwave,c)
|
||||
! Output: Complex data in c(), sampled at 400 Hz
|
||||
|
||||
include 'wsprcpm_params.f90'
|
||||
parameter (NMAX=120*12000,NFFT2=NMAX/53)
|
||||
parameter (NMAX=120*12000,NFFT2=NMAX/32)
|
||||
integer*2 iwave(NMAX)
|
||||
complex c(0:NZ-1)
|
||||
complex c(0:NMAX/32-1)
|
||||
complex c1(0:NFFT2-1)
|
||||
complex cx(0:NMAX/2)
|
||||
real x(NMAX)
|
||||
@ -564,8 +544,7 @@ subroutine wsprcpm_downsample(iwave,c)
|
||||
enddo
|
||||
c1=c1/NFFT2
|
||||
call four2a(c1,NFFT2,1,1,1) !c2c FFT back to time domain
|
||||
c=c1(0:NZ-1)
|
||||
|
||||
c=c1(0:NMAX/32-1)
|
||||
return
|
||||
end subroutine wsprcpm_downsample
|
||||
|
||||
|
||||
@ -42,7 +42,6 @@ program wsprcpmsim
|
||||
fs=12000.0/NDOWN !
|
||||
dt=1.0/fs !Sample interval (s)
|
||||
tt=NSPS*dt !Duration of "itone" symbols (s)
|
||||
ts=2*NSPS*dt !Duration of OQPSK symbols (s)
|
||||
baud=1.0/tt !Keying rate for "itone" symbols (baud)
|
||||
txt=NZ*dt !Transmission length (s)
|
||||
bandwidth_ratio=2500.0/(fs/2.0)
|
||||
@ -55,25 +54,11 @@ program wsprcpmsim
|
||||
1000 format('f0:',f9.3,' DT:',f6.2,' txt:',f6.1,' SNR:',f6.1, &
|
||||
' fspread:',f6.1,' delay:',f6.1,' nfiles:',i3,2x,a22)
|
||||
|
||||
h1=0.80
|
||||
h2=0.80
|
||||
dphi11=twopi*(f0+(h1/2.0)*baud)*dt
|
||||
dphi01=twopi*(f0-(h1/2.0)*baud)*dt
|
||||
dphi12=twopi*(f0+(h2/2.0)*baud)*dt
|
||||
dphi02=twopi*(f0-(h2/2.0)*baud)*dt
|
||||
phi=0.0
|
||||
h=1.00
|
||||
c0=0.
|
||||
k=-1 + nint(xdt/dt)
|
||||
do j=1,NN
|
||||
if( mod(j,2) .eq. 0 ) then
|
||||
dphi1=dphi11
|
||||
dphi0=dphi01
|
||||
else
|
||||
dphi1=dphi12
|
||||
dphi0=dphi02
|
||||
endif
|
||||
dp=dphi1
|
||||
if(itone(j).eq.-1) dp=dphi0
|
||||
dp=twopi*(f0+itone(j)*(h/2.0)*baud)*dt
|
||||
do i=1,NSPS
|
||||
k=k+1
|
||||
phi=mod(phi+dp,twopi)
|
||||
@ -109,7 +94,7 @@ program wsprcpmsim
|
||||
!write(57,*) i,real(c(i)),imag(c(i))
|
||||
!enddo
|
||||
else
|
||||
call wsprcpm_wav(baud,xdt,h1,h2,f0,itone,snrdb,iwave)
|
||||
call wsprcpm_wav(baud,xdt,h,f0,itone,snrdb,iwave)
|
||||
hwav=default_header(12000,NMAX)
|
||||
write(fname,1102) ifile
|
||||
1102 format('000000_',i4.4,'.wav')
|
||||
|
||||
Loading…
Reference in New Issue
Block a user