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MMDVM
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Try the boxcar filter on all modes.

This commit is contained in:
Jonathan Naylor 2017-07-02 17:08:45 +01:00
parent ae9e35ccad
commit 316085f2a6
2 changed files with 26 additions and 82 deletions
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104
IO.cpp
View File

@ -22,16 +22,6 @@
#include "Globals.h"
#include "IO.h"
// Generated using rcosdesign(0.2, 8, 5, 'sqrt') in MATLAB
static q15_t RRC_0_2_FILTER[] = {401, 104, -340, -731, -847, -553, 112, 909, 1472, 1450, 683, -675, -2144, -3040, -2706, -770, 2667, 6995,
11237, 14331, 15464, 14331, 11237, 6995, 2667, -770, -2706, -3040, -2144, -675, 683, 1450, 1472, 909, 112,
-553, -847, -731, -340, 104, 401, 0};
const uint16_t RRC_0_2_FILTER_LEN = 42U;
// Generated using gaussfir(0.5, 4, 5) in MATLAB
static q15_t GAUSSIAN_0_5_FILTER[] = {8, 104, 760, 3158, 7421, 9866, 7421, 3158, 760, 104, 8, 0};
const uint16_t GAUSSIAN_0_5_FILTER_LEN = 12U;
// One symbol boxcar filter
static q15_t BOXCAR_FILTER[] = {3000, 3000, 3000, 3000, 3000, 0};
const uint16_t BOXCAR_FILTER_LEN = 6U;
@ -43,11 +33,7 @@ m_started(false),
m_rxBuffer(RX_RINGBUFFER_SIZE),
m_txBuffer(TX_RINGBUFFER_SIZE),
m_rssiBuffer(RX_RINGBUFFER_SIZE),
m_rrcFilter(),
m_gaussianFilter(),
m_boxcarFilter(),
m_rrcState(),
m_gaussianState(),
m_boxcarState(),
m_pttInvert(false),
m_rxLevel(128 * 128),
@ -64,17 +50,7 @@ m_dacOverflow(0U),
m_watchdog(0U),
m_lockout(false)
{
::memset(m_rrcState, 0x00U, 70U * sizeof(q15_t));
::memset(m_gaussianState, 0x00U, 40U * sizeof(q15_t));
::memset(m_boxcarState, 0x00U, 30U * sizeof(q15_t));
m_rrcFilter.numTaps = RRC_0_2_FILTER_LEN;
m_rrcFilter.pState = m_rrcState;
m_rrcFilter.pCoeffs = RRC_0_2_FILTER;
m_gaussianFilter.numTaps = GAUSSIAN_0_5_FILTER_LEN;
m_gaussianFilter.pState = m_gaussianState;
m_gaussianFilter.pCoeffs = GAUSSIAN_0_5_FILTER;
::memset(m_boxcarState, 0x00U, 30U * sizeof(q15_t));
m_boxcarFilter.numTaps = BOXCAR_FILTER_LEN;
m_boxcarFilter.pState = m_boxcarState;
@ -157,76 +133,48 @@ void CIO::process()
if (m_lockout)
return;
q15_t vals[RX_BLOCK_SIZE];
::arm_fir_fast_q15(&m_boxcarFilter, samples, vals, RX_BLOCK_SIZE);
if (m_modemState == STATE_IDLE) {
if (m_dstarEnable) {
q15_t GMSKVals[RX_BLOCK_SIZE];
::arm_fir_fast_q15(&m_gaussianFilter, samples, GMSKVals, RX_BLOCK_SIZE);
if (m_dstarEnable)
dstarRX.samples(vals, rssi, RX_BLOCK_SIZE);
dstarRX.samples(GMSKVals, rssi, RX_BLOCK_SIZE);
if (m_p25Enable)
p25RX.samples(vals, rssi, RX_BLOCK_SIZE);
if (m_dmrEnable) {
if (m_duplex)
dmrIdleRX.samples(vals, RX_BLOCK_SIZE);
else
dmrDMORX.samples(vals, rssi, RX_BLOCK_SIZE);
}
if (m_p25Enable) {
q15_t P25Vals[RX_BLOCK_SIZE];
::arm_fir_fast_q15(&m_boxcarFilter, samples, P25Vals, RX_BLOCK_SIZE);
p25RX.samples(P25Vals, rssi, RX_BLOCK_SIZE);
}
if (m_dmrEnable || m_ysfEnable) {
q15_t C4FSKVals[RX_BLOCK_SIZE];
::arm_fir_fast_q15(&m_rrcFilter, samples, C4FSKVals, RX_BLOCK_SIZE);
if (m_dmrEnable) {
if (m_duplex)
dmrIdleRX.samples(C4FSKVals, RX_BLOCK_SIZE);
else
dmrDMORX.samples(C4FSKVals, rssi, RX_BLOCK_SIZE);
}
if (m_ysfEnable)
ysfRX.samples(C4FSKVals, rssi, RX_BLOCK_SIZE);
}
if (m_ysfEnable)
ysfRX.samples(vals, rssi, RX_BLOCK_SIZE);
} else if (m_modemState == STATE_DSTAR) {
if (m_dstarEnable) {
q15_t GMSKVals[RX_BLOCK_SIZE];
::arm_fir_fast_q15(&m_gaussianFilter, samples, GMSKVals, RX_BLOCK_SIZE);
dstarRX.samples(GMSKVals, rssi, RX_BLOCK_SIZE);
}
if (m_dstarEnable)
dstarRX.samples(vals, rssi, RX_BLOCK_SIZE);
} else if (m_modemState == STATE_DMR) {
if (m_dmrEnable) {
q15_t C4FSKVals[RX_BLOCK_SIZE];
::arm_fir_fast_q15(&m_rrcFilter, samples, C4FSKVals, RX_BLOCK_SIZE);
if (m_duplex) {
// If the transmitter isn't on, use the DMR idle RX to detect the wakeup CSBKs
if (m_tx)
dmrRX.samples(C4FSKVals, rssi, control, RX_BLOCK_SIZE);
dmrRX.samples(vals, rssi, control, RX_BLOCK_SIZE);
else
dmrIdleRX.samples(C4FSKVals, RX_BLOCK_SIZE);
dmrIdleRX.samples(vals, RX_BLOCK_SIZE);
} else {
dmrDMORX.samples(C4FSKVals, rssi, RX_BLOCK_SIZE);
dmrDMORX.samples(vals, rssi, RX_BLOCK_SIZE);
}
}
} else if (m_modemState == STATE_YSF) {
if (m_ysfEnable) {
q15_t C4FSKVals[RX_BLOCK_SIZE];
::arm_fir_fast_q15(&m_rrcFilter, samples, C4FSKVals, RX_BLOCK_SIZE);
ysfRX.samples(C4FSKVals, rssi, RX_BLOCK_SIZE);
}
if (m_ysfEnable)
ysfRX.samples(vals, rssi, RX_BLOCK_SIZE);
} else if (m_modemState == STATE_P25) {
if (m_p25Enable) {
q15_t P25Vals[RX_BLOCK_SIZE];
::arm_fir_fast_q15(&m_boxcarFilter, samples, P25Vals, RX_BLOCK_SIZE);
p25RX.samples(P25Vals, rssi, RX_BLOCK_SIZE);
}
if (m_p25Enable)
p25RX.samples(vals, rssi, RX_BLOCK_SIZE);
} else if (m_modemState == STATE_DSTARCAL) {
q15_t GMSKVals[RX_BLOCK_SIZE];
::arm_fir_fast_q15(&m_gaussianFilter, samples, GMSKVals, RX_BLOCK_SIZE);
calDStarRX.samples(GMSKVals, RX_BLOCK_SIZE);
calDStarRX.samples(vals, RX_BLOCK_SIZE);
} else if (m_modemState == STATE_RSSICAL) {
calRSSI.samples(rssi, RX_BLOCK_SIZE);
}

4
IO.h
View File

@ -60,11 +60,7 @@ private:
CSampleRB m_txBuffer;
CRSSIRB m_rssiBuffer;
arm_fir_instance_q15 m_rrcFilter;
arm_fir_instance_q15 m_gaussianFilter;
arm_fir_instance_q15 m_boxcarFilter;
q15_t m_rrcState[70U]; // NoTaps + BlockSize - 1, 42 + 20 - 1 plus some spare
q15_t m_gaussianState[40U]; // NoTaps + BlockSize - 1, 12 + 20 - 1 plus some spare
q15_t m_boxcarState[30U]; // NoTaps + BlockSize - 1, 6 + 20 - 1 plus some spare
bool m_pttInvert;