2024-02-09 07:15:15 -05:00
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module sfox_mod
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parameter (NMAX=15*12000) !Samples in iwave (180,000)
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integer MM,NQ,NN,KK,NS,NDS,NFZ,NSPS,NSYNC,NZ,NFFT1
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real baud,tsym,bw
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contains
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2024-02-25 10:10:51 -05:00
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subroutine sfox_init(mm0,nn0,kk0,itu,fspread,delay,fsample,ns0)
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character*2 itu
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integer isps(54)
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integer iloc(1)
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data isps/ 896, 960, 972, 980,1000,1008,1024,1029,1050,1080, &
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1120,1125,1134,1152,1176,1200,1215,1225,1250,1260, &
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1280,1296,1323,1344,1350,1372,1400,1440,1458,1470, &
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1500,1512,1536,1568,1575,1600,1620,1680,1701,1715, &
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1728,1750,1764,1792,1800,1875,1890,1920,1944,1960, &
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2000,2016,2025,2048/
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MM=mm0 !Bits per symbol
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NQ=2**MM !Q, number of MFSK tones
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NN=nn0 !Codeword length
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KK=kk0 !Number of information symbols
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NS=ns0 !Number of sync symbols
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NDS=NN+NS !Total number of channel symbols
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NFZ=3 !First zero
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jsps=nint(12.8*fsample/NDS)
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iloc=minloc(abs(isps-jsps))
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NSPS=isps(iloc(1)) !Samples per symbol
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NSYNC=NS*NSPS !Samples in sync waveform
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NZ=NSPS*NDS !Samples in full Tx waveform
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NFFT1=2*NSPS !Length of FFTs for symbol spectra
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baud=fsample/NSPS
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tsym=1.0/baud
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bw=NQ*baud
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fspread=0.0
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delay=0.0
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if(itu.eq.'LQ') then
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fspread=0.5
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delay=0.5
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else if(itu.eq.'LM') then
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fspread=1.5
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delay=2.0
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else if(itu.eq.'LD') then
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fspread=10.0
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delay=6.0
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else if(itu.eq.'MQ') then
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fspread=0.1
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delay=0.5
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else if(itu.eq.'MM') then
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fspread=0.5
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delay=1.0
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else if(itu.eq.'MD') then
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fspread=1.0
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delay=2.0
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else if(itu.eq.'HQ') then
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fspread=0.5
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delay=1.0
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else if(itu.eq.'HM') then
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fspread=10.0
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delay=3.0
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else if(itu.eq.'HD') then
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fspread=30.0
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delay=7.0
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endif
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return
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end subroutine sfox_init
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end module sfox_mod
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