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Adding raw data stream BPSK - QPSK (#1534)

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* Adding raw data stream BPSK - QPSK
* minor code compact
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Brumi-2021 2023-10-30 11:32:34 +01:00 • committed by GitHub
parent a11929d2ca
commit be7b402c95
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3 changed files with 68 additions and 19 deletions
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56
firmware/baseband/proc_siggen.cpp
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@ -40,7 +40,7 @@ void SigGenProcessor::execute(const buffer_c8_t& buffer) {
if (tone_shape == 0) {
// CW
re = 127;
re = 127; // max. signed 8 bits value . (-128 ...+127), max. amplitude , static phasor at 0º
im = 0;
} else {
if (tone_shape == 1) {
@ -79,20 +79,58 @@ void SigGenProcessor::execute(const buffer_c8_t& buffer) {
if (counter == 15) {
counter = 0;
}
} else if (tone_shape == 7) {
// Digital BPSK consecutive 0,1,0,...continuous cycle, 1 bit/symbol, at rate of 2 symbols / Freq Tone Periode... without any Pulse shape at the moment .
re = (((tone_phase & 0xFF000000) >> 24) & 0x80) ? 127 : -128; // Sending 2 bits by Periode T of the GUI tone, alternative static phasor to 0, -180º , 0º
im = 0;
} else if (tone_shape == 8) {
// Digital QPSK consecutive 00, 01, 10, 11,00, ...continuous cycle ,2 bits/symbol, at rate of 4 symbols / Freq Tone Periode. not random., without any Pulse shape at the moment .
switch (((tone_phase & 0xFF000000) >> 24)) {
case 0 ... 63: // equivalent to 1/4 of total 360º degrees.
/* "00" */
re = (sine_table_i8[32]); // we are sending symbol-phasor 45º during 1/4 of the total periode
im = (sine_table_i8[32 + 64]); // 32 index = rounded (45º/360º * 255 total sin table steps)
break;
case 64 ... 127:
/* "01" */
re = (sine_table_i8[96]); // symbol-phasor 135º
im = (sine_table_i8[96 + 64]); // 96 index = 32 + 256/4
break;
break;
case 128 ... 191:
/* "10" */
re = (sine_table_i8[160]); // symbol-phasor 225º
im = (sine_table_i8[160 + 64]); // 160 index = 96 + 256/4
break;
case 192 ... 255:
/* "11" */
re = (sine_table_i8[224]); // symbol-phasor 315º , (315/360) * 255
im = (sine_table_i8[224 + 64]);
break;
default:
break;
}
}
if (tone_shape < 6) { // we are in periodic signals, we need tone phases update.
tone_phase += tone_delta;
if (tone_shape != 6) { //(all except Pseudo Random White Noise). We are in (1):periodic signals or (2):BPSK/QPSK , in both cases ,we need Tone updated acum sum phases to modulate in FM / or control phasor phase (BPSK & QPSK.)
tone_phase += tone_delta; // In periodic signals(Sine/triangle/square) we are using to FM mod. in BPSK-QSPK we are using to calculate each 1/4 of the periode.
}
// Do FM modulation
delta = sample * fm_delta;
if (tone_shape < 7) { // All Option shape signals except BPSK(7) & QPSK(8) we are modulating in FM. (Those two has phase shift modulation XPSK , not FM )
// Do FM modulation
delta = sample * fm_delta;
phase += delta;
sphase = phase + (64 << 24);
phase += delta;
sphase = phase + (64 << 24);
re = (sine_table_i8[(sphase & 0xFF000000) >> 24]);
im = (sine_table_i8[(phase & 0xFF000000) >> 24]);
re = (sine_table_i8[(sphase & 0xFF000000) >> 24]); // sin LUT is not dealing with decimals , output range [-128 ,...127]
im = (sine_table_i8[(phase & 0xFF000000) >> 24]);
}
}
buffer.p[i] = {re, im};