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Short moving average.

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This commit is contained in:
John Greb 2015-01-21 00:53:00 +00:00
parent c917ddf058
commit 3c9ab44d68
3 changed files with 28 additions and 15 deletions
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6
plugins/channel/lora/lorabits.h
View File

@ -4,7 +4,7 @@
*/
// Needs adjusting for different sizes
void interleave(short* inout)
void LoRaDemod::interleave(short* inout)
{
int i, index = 6;
short in[index * 2];
@ -18,10 +18,8 @@ void interleave(short* inout)
}
// Same sequence for any size
void make_gray(void)
void LoRaDemod::make_gray()
{
short gray[1<<8];
// short ungray[1<<8];
short k = 0;
for (short i = 0; i < 1<<8; i++) {
gray[i] = k;

31
plugins/channel/lora/lorademod.cpp
View File

@ -21,7 +21,7 @@
#include "lorademod.h"
#include "dsp/dspcommands.h"
//#include "lorabits.h"
#include "lorabits.h"
MESSAGE_CLASS_DEFINITION(LoRaDemod::MsgConfigureLoRaDemod, Message)
@ -45,7 +45,9 @@ LoRaDemod::LoRaDemod(SampleSink* sampleSink) :
loraFilter = new sfft(LORA_SFFT_LEN);
negaFilter = new sfft(LORA_SFFT_LEN);
//make_gray();
mov = new float[4*LORA_SFFT_LEN];
gray = new short[1<<8];
make_gray();
}
LoRaDemod::~LoRaDemod()
@ -54,6 +56,10 @@ LoRaDemod::~LoRaDemod()
delete loraFilter;
if (negaFilter)
delete negaFilter;
if (mov)
delete [] mov;
if (gray)
delete [] gray;
}
void LoRaDemod::configure(MessageQueue* messageQueue, Real Bandwidth)
@ -63,19 +69,21 @@ void LoRaDemod::configure(MessageQueue* messageQueue, Real Bandwidth)
}
int LoRaDemod::detect(Complex c, Complex a)
int LoRaDemod::detect(Complex c, Complex a)
{
int i, result, negresult;
float peak, negpeak;
int i, result, negresult, movpoint;
float peak, negpeak, tfloat;
float mag[LORA_SFFT_LEN];
float rev[LORA_SFFT_LEN];
loraFilter->run(c * a);
negaFilter->run(c * conj(a));
if (++m_count & 31)
return m_result;
// process spectrum every 32 samples
// process spectrum twice in FFTLEN
if (++m_count & ((1 << DATA_BITS) - 1))
return m_result;
movpoint = 3 & (m_count >> DATA_BITS);
loraFilter->fetch(mag);
negaFilter->fetch(rev);
peak = negpeak = 0.0f;
@ -85,10 +93,13 @@ int LoRaDemod::detect(Complex c, Complex a)
negpeak = rev[i];
negresult = i;
}
if (mag[i] > peak) {
peak = mag[i];
tfloat = mov[i] + mov[LORA_SFFT_LEN + i] +mov[2 * LORA_SFFT_LEN + i]
+ mov[3 * LORA_SFFT_LEN + i] + mag[i];
if (tfloat > peak) {
peak = tfloat;
result = i;
}
mov[movpoint * LORA_SFFT_LEN + i] = mag[i];
}
if (peak > negpeak) {
m_result = result;

6
plugins/channel/lora/lorademod.h
View File

@ -38,12 +38,14 @@ public:
void configure(MessageQueue* messageQueue, Real Bandwidth);
void feed(SampleVector::const_iterator begin, SampleVector::const_iterator end, bool pO);
int detect(Complex sample, Complex angle);
void start();
void stop();
bool handleMessage(Message* cmd);
private:
int detect(Complex sample, Complex angle);
void interleave(short* inout);
void make_gray();
class MsgConfigureLoRaDemod : public Message {
MESSAGE_CLASS_DECLARATION
@ -77,6 +79,8 @@ private:
sfft* loraFilter;
sfft* negaFilter;
float* mov;
short* gray;
NCO m_nco;
Interpolator m_interpolator;