kopia lustrzana https://github.com/xaelsouth/rtl-wmbus
517 wiersze
18 KiB
C
517 wiersze
18 KiB
C
/*-
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* Copyright (c) 2017 <xael.south@yandex.com>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <stdint.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <complex.h>
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#include <stdio.h>
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#include <errno.h>
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#include <fixedptc/fixedptc.h>
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#include "fir.h"
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#include "iir.h"
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#include "ppf.h"
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#include "moving_average_filter.h"
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#include "atan2.h"
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#include "net_support.h"
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#include "t1_c1_packet_decoder.h"
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#if defined(__SSE4_2__)
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#include <immintrin.h>
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#endif
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static float lp_1600kHz_56kHz(int sample, size_t i_or_q)
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{
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static float moving_average[2];
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#define ALPHA 0.80259f // exp(-2.0 * M_PI * 56e3 / 1600e3)
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moving_average[i_or_q] = ALPHA * (moving_average[i_or_q] - sample) + sample;
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#undef ALPHA
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return moving_average[i_or_q];
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}
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static inline float moving_average(int sample, size_t i_or_q)
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{
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#define COEFFS 12
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static int i_hist[COEFFS];
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static int q_hist[COEFFS];
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static MAVGI_FILTER filter[2] = // i/q
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{
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{.length = COEFFS, .hist = i_hist}, // 0
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{.length = COEFFS, .hist = q_hist} // 1
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};
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#undef COEFFS
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return mavgi(sample, &filter[i_or_q]);
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}
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static inline float lp_fir_butter_1600kHz_160kHz_200kHz(int sample, size_t i_or_q)
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{
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#define COEFFS 23
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static const float b[COEFFS] = {0.000140535927, 1.102280392e-05, 0.0001309279731, 0.001356012537, 0.00551787474, 0.01499414005, 0.03160167988, 0.05525973093, 0.08315031015, 0.1099887688, 0.1295143636, 0.1366692652, 0.1295143636, 0.1099887688, 0.08315031015, 0.05525973093, 0.03160167988, 0.01499414005, 0.00551787474, 0.001356012537, 0.0001309279731, 1.102280392e-05, 0.000140535927, };
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static float i_hist[COEFFS] = {};
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static float q_hist[COEFFS] = {};
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static FIRF_FILTER filter[2] = // i/q
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{
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{.length = COEFFS, .b = b, .hist = i_hist}, // 0
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{.length = COEFFS, .b = b, .hist = q_hist} // 1
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};
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#undef COEFFS
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return firf(sample, &filter[i_or_q]);
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}
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static inline float lp_firfp_butter_1600kHz_160kHz_200kHz(int sample, size_t i_or_q)
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{
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#define COEFFS 23
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static const fixedpt b[COEFFS] = {fixedpt_rconst(0.000140535927), fixedpt_rconst(1.102280392e-05), fixedpt_rconst(0.0001309279731), fixedpt_rconst(0.001356012537), fixedpt_rconst(0.00551787474),
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fixedpt_rconst(0.01499414005), fixedpt_rconst(0.03160167988), fixedpt_rconst(0.05525973093), fixedpt_rconst(0.08315031015), fixedpt_rconst(0.1099887688),
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fixedpt_rconst(0.1295143636), fixedpt_rconst(0.1366692652), fixedpt_rconst(0.1295143636), fixedpt_rconst(0.1099887688), fixedpt_rconst(0.08315031015),
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fixedpt_rconst(0.05525973093), fixedpt_rconst(0.03160167988), fixedpt_rconst(0.01499414005), fixedpt_rconst(0.00551787474), fixedpt_rconst(0.001356012537),
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fixedpt_rconst(0.0001309279731), fixedpt_rconst(1.102280392e-05), fixedpt_rconst(0.000140535927),
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};
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static fixedpt i_hist[COEFFS] = {};
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static fixedpt q_hist[COEFFS] = {};
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static FIRFP_FILTER filter[2] = // i/q
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{
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{.length = COEFFS, .b = b, .hist = i_hist}, // 0
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{.length = COEFFS, .b = b, .hist = q_hist} // 1
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};
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#undef COEFFS
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return fixedpt_tofloat(firfp(fixedpt_fromint(sample), &filter[i_or_q]));
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}
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static inline float lp_ppf_butter_1600kHz_160kHz_200kHz(int sample, size_t i_or_q)
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{
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#define PHASES 2
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#define COEFFS 12
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static const float b[PHASES][COEFFS] =
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{
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{0.000140535927, 0.0001309279731, 0.00551787474, 0.03160167988, 0.08315031015, 0.1295143636, 0.1295143636, 0.08315031015, 0.03160167988, 0.00551787474, 0.0001309279731, 0.000140535927, },
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{1.102280392e-05, 0.001356012537, 0.01499414005, 0.05525973093, 0.1099887688, 0.1366692652, 0.1099887688, 0.05525973093, 0.01499414005, 0.001356012537, 1.102280392e-05, 0, },
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};
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static float i_hist[PHASES][COEFFS] = {};
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static float q_hist[PHASES][COEFFS] = {};
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static FIRF_FILTER fir[2][PHASES] =
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{
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{
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// i/q phase
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{.length = COEFFS, .b = b[1], .hist = i_hist[0]}, // 0 0
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{.length = COEFFS, .b = b[0], .hist = i_hist[1]} // 0 1
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},
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{
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// i/q phase
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{.length = COEFFS, .b = b[1], .hist = q_hist[0]}, // 1 0
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{.length = COEFFS, .b = b[0], .hist = q_hist[1]} // 1 1
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},
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};
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static PPF_FILTER filter[2] =
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{
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{.sum = 0, .phase = 0, .max_phase = PHASES, .fir = fir[0]}, // 0 =: i
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{.sum = 0, .phase = 0, .max_phase = PHASES, .fir = fir[1]}, // 1 =: q
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};
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#undef COEFFS
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#undef PHASES
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return ppf(sample, &filter[i_or_q]);
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}
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static inline float lp_ppffp_butter_1600kHz_160kHz_200kHz(int sample, size_t i_or_q)
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{
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#define PHASES 2
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#define COEFFS 12
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static const fixedpt b[PHASES][COEFFS] =
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{
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{fixedpt_rconst(0.000140535927), fixedpt_rconst(0.0001309279731), fixedpt_rconst(0.00551787474), fixedpt_rconst(0.03160167988), fixedpt_rconst(0.08315031015), fixedpt_rconst(0.1295143636), fixedpt_rconst(0.1295143636), fixedpt_rconst(0.08315031015), fixedpt_rconst(0.03160167988), fixedpt_rconst(0.00551787474), fixedpt_rconst(0.0001309279731), fixedpt_rconst(0.000140535927), },
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{fixedpt_rconst(1.102280392e-05), fixedpt_rconst(0.001356012537), fixedpt_rconst(0.01499414005), fixedpt_rconst(0.05525973093), fixedpt_rconst(0.1099887688), fixedpt_rconst(0.1366692652), fixedpt_rconst(0.1099887688), fixedpt_rconst(0.05525973093), fixedpt_rconst(0.01499414005), fixedpt_rconst(0.001356012537), fixedpt_rconst(1.102280392e-05), fixedpt_rconst(0), },
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};
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static fixedpt i_hist[PHASES][COEFFS] = {};
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static fixedpt q_hist[PHASES][COEFFS] = {};
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static FIRFP_FILTER fir[2][PHASES] =
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{
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{
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// i/q phase
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{.length = COEFFS, .b = b[1], .hist = i_hist[0]}, // 0 0
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{.length = COEFFS, .b = b[0], .hist = i_hist[1]} // 0 1
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},
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{
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// i/q phase
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{.length = COEFFS, .b = b[1], .hist = q_hist[0]}, // 1 0
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{.length = COEFFS, .b = b[0], .hist = q_hist[1]} // 1 1
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},
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};
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static PPFFP_FILTER filter[2] =
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{
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{.sum = fixedpt_rconst(0), .phase = 0, .max_phase = PHASES, .fir = fir[0]}, // 0 =: i
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{.sum = fixedpt_rconst(0), .phase = 0, .max_phase = PHASES, .fir = fir[1]}, // 1 =: q
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};
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#undef COEFFS
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#undef PHASES
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return fixedpt_tofloat(ppffp(fixedpt_fromint(sample), &filter[i_or_q]));
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}
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static inline float bp_iir_cheb1_800kHz_90kHz_98kHz_102kHz_110kHz(float sample)
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{
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#define GAIN 1.874981046e-06
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#define SECTIONS 3
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static const float b[3*SECTIONS] = {1, 1.999994649, 0.9999946492, 1, -1.99999482, 0.9999948196, 1, 1.703868036e-07, -1.000010531, };
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static const float a[3*SECTIONS] = {1, -1.387139203, 0.9921518712, 1, -1.403492665, 0.9845934971, 1, -1.430055639, 0.9923856172, };
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static float hist[3*SECTIONS] = {};
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static IIRF_FILTER filter = {.sections = SECTIONS, .b = b, .a = a, .gain = GAIN, .hist = hist};
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#undef SECTIONS
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#undef GAIN
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return iirf(sample, &filter);
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}
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static inline float lp_fir_butter_800kHz_100kHz_10kHz(float sample)
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{
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#define COEFFS 4
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static const float b[COEFFS] = {0.04421550009, 0.4557844999, 0.4557844999, 0.04421550009, };
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static float hist[COEFFS];
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static FIRF_FILTER filter = {.length = COEFFS, .b = b, .hist = hist};
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#undef COEFFS
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return firf(sample, &filter);
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}
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static float rssi_filter(int sample)
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{
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static float old_sample;
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#define ALPHA 0.6789f
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old_sample = ALPHA*sample + (1.0f - ALPHA)*old_sample;
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#undef ALPHA
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return old_sample;
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}
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static inline float polar_discriminator(float i, float q)
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{
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static float complex s_last;
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const float complex s = i + q * _Complex_I;
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const float complex y = s * conj(s_last);
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#if 0
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const float delta_phi = atan2_libm(y);
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#elif 1
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const float delta_phi = atan2_approximation(y);
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#else
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const float delta_phi = atan2_approximation2(y);
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#endif
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s_last = s;
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return delta_phi;
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}
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/** @brief Sparse Ones runs in time proportional to the number
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* of 1 bits.
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*
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* From: http://gurmeet.net/puzzles/fast-bit-counting-routines
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*/
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static inline unsigned count_set_bits_sparse_one(uint32_t n)
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{
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unsigned count = 0;
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while (n)
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{
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count++;
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n &= (n - 1) ; // set rightmost 1 bit in n to 0
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}
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return count;
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}
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static inline unsigned count_set_bits(uint32_t n)
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{
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#if defined(__i386__) || defined(__arm__)
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return __builtin_popcount(n);
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#else
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return count_set_bits_sparse_one(n);
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#endif
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}
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static inline int majority_votes_bitfilter(uint32_t unfilt_bitstream, uint32_t bits_in_unfilt_bitstream)
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{
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const unsigned ones = count_set_bits(unfilt_bitstream & bits_in_unfilt_bitstream);
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const bool odd = (ones & 1) > 0;
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const uint32_t bits_in_unfilt_bitstream_half = count_set_bits(bits_in_unfilt_bitstream)/2;
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if (odd)
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return (ones <= bits_in_unfilt_bitstream_half) ? 0 : 1;
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if (ones < bits_in_unfilt_bitstream_half)
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return 0;
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if (ones > bits_in_unfilt_bitstream_half)
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return 1;
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return unfilt_bitstream & 1;
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}
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typedef void (*OutFunction)(unsigned bit, unsigned rssi);
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static inline void to_stdout(unsigned bit, unsigned rssi)
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{
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(void)rssi;
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const uint8_t tmp = bit;
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fwrite(&tmp, sizeof(tmp), 1, stdout);
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}
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static const OutFunction out_functions[] = { to_stdout, t1_c1_packet_decoder };
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int main(int argc, char *argv[])
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{
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(void)argc;
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(void)argv;
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// --- parameter section begin ---
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// The idea behind the variables in the section is to make parameters
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// configurable via command line.
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const unsigned CLOCK_LOCK_THRESHOLD = 2;
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const unsigned DECIMATION_RATE = 2;
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//#define USING_BITFILTER
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const uint32_t ACCESS_CODE = 0b0101010101010000111101u;
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const uint32_t ACCESS_CODE_BITMASK = 0x3FFFFFu;
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const unsigned ACCESS_CODE_ERRORS = 1u; // 0 if no errors allowed
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// --- parameter section end ---
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// Select function for output
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OutFunction out_function = out_functions[1];
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__attribute__((__aligned__(16))) uint8_t samples[4096];
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float i = 0, q = 0;
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unsigned decimation_rate_index = 0;
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int16_t old_clock = INT16_MIN;
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uint32_t bitstream = 0;
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unsigned clock_lock = 0;
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#if defined(USING_BITFILTER)
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uint32_t unfilt_bitstream = 0;
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uint32_t bits_in_unfilt_bitstream = 0;
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#endif
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#if defined (__SSE4_2__)
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__attribute__((__aligned__(16))) int16_t iq_samples[sizeof(samples)];
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const __m128i dc_offset = _mm_set_epi16(-127, -127, -127, -127, -127, -127, -127, -127);
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#endif
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//FILE *input = fopen("samples.bin", "rb");
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//FILE *input = get_net("localhost", 14423);
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FILE *input= stdin;
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if (input == NULL)
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{
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fprintf(stderr, "opening input error\n");
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return EXIT_FAILURE;
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}
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//FILE *demod_out = fopen("demod.bin", "wb");
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//FILE *demod_out2 = fopen("demod.bin", "wb");
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//FILE *clock_out = fopen("clock.bin", "wb");
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//FILE *bits_out= fopen("bits.bin", "wb");
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while (!feof(input))
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{
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size_t read_items = fread(samples, sizeof(samples), 1, input);
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if (1 != read_items)
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{
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// End of file?..
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return 2;
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}
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#if defined (__SSE4_2__)
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for (size_t k = 0; k < sizeof(samples)/sizeof(samples[0]); k += 8) // +2 : i and q interleaved
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{
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__m128i tmp = _mm_loadu_si128((__m128i const*)&samples[k]); // Hmmm, loading 8 byte besides of upper boundary?..
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__m128i cvt = _mm_add_epi16(_mm_cvtepu8_epi16(tmp), dc_offset);
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_mm_store_si128((__m128i *)&iq_samples[k], cvt);
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}
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#endif
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for (size_t k = 0; k < sizeof(samples)/sizeof(samples[0]); k += 2) // +2 : i and q interleaved
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{
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#if defined (__SSE4_2__)
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const int i_unfilt = iq_samples[k];
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const int q_unfilt = iq_samples[k+1];
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#else
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const int i_unfilt = ((int)samples[k] - 127);
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const int q_unfilt = ((int)samples[k + 1] - 127);
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#endif
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// Low-Pass-Filtering before decimation is necessary, to ensure
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// that i and q signals don't contain frequencies above new sample
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// rate.
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// The sample rate decimation is realised as sum over i and q,
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// which must not be divided by decimation factor before
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// demodulating (atan2(q,i)).
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#if 0
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i = lp_fir_butter_1600kHz_160kHz_200kHz(i_unfilt, 0);
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q = lp_fir_butter_1600kHz_160kHz_200kHz(q_unfilt, 1);
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#elif 0
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i = lp_ppf_butter_1600kHz_160kHz_200kHz(i_unfilt, 0);
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q = lp_ppf_butter_1600kHz_160kHz_200kHz(q_unfilt, 1);
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#elif 0
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i = lp_firfp_butter_1600kHz_160kHz_200kHz(i_unfilt, 0);
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q = lp_firfp_butter_1600kHz_160kHz_200kHz(q_unfilt, 1);
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#elif 0
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i = lp_ppffp_butter_1600kHz_160kHz_200kHz(i_unfilt, 0);
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q = lp_ppffp_butter_1600kHz_160kHz_200kHz(q_unfilt, 1);
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#elif 0
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i += lp_1600kHz_58kHz(i_unfilt, 0);
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q += lp_1600kHz_58kHz(q_unfilt, 1);
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#define USE_MOVING_AVERAGE
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#else
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i += moving_average(i_unfilt, 0);
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q += moving_average(q_unfilt, 1);
|
|
#define USE_MOVING_AVERAGE
|
|
#endif
|
|
|
|
++decimation_rate_index;
|
|
if (decimation_rate_index < DECIMATION_RATE) continue;
|
|
decimation_rate_index = 0;
|
|
|
|
// Demodulate.
|
|
float delta_phi = polar_discriminator(i, q);
|
|
|
|
//int16_t demodulated_signal = (INT16_MAX-1)*delta_phi;
|
|
//fwrite(&demodulated_signal, sizeof(demodulated_signal), 1, demod_out);
|
|
|
|
// Post-filtering to prevent bit errors because of signal jitter.
|
|
delta_phi = lp_fir_butter_800kHz_100kHz_10kHz(delta_phi);
|
|
//int16_t demodulated_signal = (INT16_MAX-1)*delta_phi;
|
|
//fwrite(&demodulated_signal, sizeof(demodulated_signal), 1, demod_out2);
|
|
|
|
// --- clock recovery section begin ---
|
|
// The time-2 method is implemented: push squared signal through a bandpass
|
|
// tuned close to the symbol rate. Saturating band-pass output produces a
|
|
// rectangular pulses with the required timing information.
|
|
// Clock-Signal is crossing zero in half period.
|
|
const int16_t clock = (bp_iir_cheb1_800kHz_90kHz_98kHz_102kHz_110kHz(delta_phi * delta_phi) >= 0) ? INT16_MAX : INT16_MIN;
|
|
//fwrite(&clock, sizeof(clock), 1, clock_out);
|
|
|
|
unsigned bit = (delta_phi >= 0) ? (1u<<PACKET_DATABIT_SHIFT) : (0u<<PACKET_DATABIT_SHIFT);
|
|
|
|
#if defined(USING_BITFILTER)
|
|
unfilt_bitstream = (unfilt_bitstream << 1) | bit;
|
|
bits_in_unfilt_bitstream = (bits_in_unfilt_bitstream << 1) | 1;
|
|
#endif
|
|
|
|
// We are using one simple filter to rssi value in order to
|
|
// prevent unexpected "splashes" in signal power.
|
|
float rssi = sqrtf(i*i + q*q);
|
|
rssi = rssi_filter(rssi); // comment out, if rssi filtering is unwanted
|
|
|
|
if (clock > old_clock) // rising edge
|
|
{
|
|
clock_lock = 1;
|
|
|
|
#if defined(USING_BITFILTER)
|
|
unfilt_bitstream = bit;
|
|
bits_in_unfilt_bitstream = 1;
|
|
#endif
|
|
}
|
|
else if (old_clock == clock && clock_lock < CLOCK_LOCK_THRESHOLD)
|
|
{
|
|
clock_lock++;
|
|
}
|
|
else if (clock_lock == CLOCK_LOCK_THRESHOLD) // sample data bit on CLOCK_LOCK_THRESHOLD after rose up
|
|
{
|
|
clock_lock++;
|
|
|
|
#if defined(USE_MOVING_AVERAGE)
|
|
// If using moving average, we would habe doubles of each of i- and q- signal components.
|
|
rssi /= DECIMATION_RATE;
|
|
#endif
|
|
|
|
#if defined(USING_BITFILTER)
|
|
// Bitfilter can be used to remove unwanted spikes in the demodulated signal.
|
|
bit = majority_votes_bitfilter(unfilt_bitstream, bits_in_unfilt_bitstream);
|
|
#endif
|
|
|
|
bitstream = (bitstream << 1) | bit;
|
|
|
|
if (count_set_bits((bitstream & ACCESS_CODE_BITMASK) ^ ACCESS_CODE) <= ACCESS_CODE_ERRORS)
|
|
{
|
|
bit |= (1u<<PACKET_PREAMBLE_DETECTED_SHIFT); // packet detected; mark the bit similar to "Access Code"-Block in GNU Radio
|
|
}
|
|
|
|
//fwrite(&bit, sizeof(bit), 1, bits_out);
|
|
out_function(bit, rssi);
|
|
}
|
|
old_clock = clock;
|
|
// --- clock recovery section end ---
|
|
|
|
#if defined(USE_MOVING_AVERAGE)
|
|
i = q = 0;
|
|
#endif
|
|
}
|
|
}
|
|
|
|
return EXIT_SUCCESS;
|
|
}
|
|
|