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removed redundant buffers

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This commit is contained in:
Ahmet Inan 2023-02-10 11:43:04 +01:00
commit a9d4249ea5
1 changed files with 5 additions and 7 deletions
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12
decode.cc
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@ -45,8 +45,8 @@ struct SchmidlCox
DSP::Delay<value, match_del> delay;
DSP::SchmittTrigger<value> threshold;
DSP::FallingEdgeTrigger falling;
cmplx tmp0[symbol_len], tmp1[symbol_len], tmp2[symbol_len];
cmplx seq[symbol_len], kern[symbol_len];
cmplx tmp0[symbol_len], tmp1[symbol_len];
cmplx kern[symbol_len];
cmplx cmplx_shift = 0;
value timing_max = 0;
value phase_max = 0;
@ -72,8 +72,6 @@ public:
SchmidlCox(const cmplx *sequence) : threshold(value(0.2*match_len), value(0.3*match_len))
{
for (int i = 0; i < symbol_len; ++i)
seq[i] = sequence[i];
fwd(kern, sequence);
for (int i = 0; i < symbol_len; ++i)
kern[i] = conj(kern[i]) / value(symbol_len);
@ -125,13 +123,13 @@ public:
fwd(tmp0, tmp1);
for (int i = 0; i < symbol_len; ++i)
tmp0[i] *= kern[i];
bwd(tmp2, tmp0);
bwd(tmp1, tmp0);
int shift = 0;
value peak = 0;
value next = 0;
for (int i = 0; i < symbol_len; ++i) {
value power = norm(tmp2[i]);
value power = norm(tmp1[i]);
if (power > peak) {
next = peak;
peak = power;
@ -143,7 +141,7 @@ public:
if (peak <= next * 4)
return false;
int pos_err = std::nearbyint(arg(tmp2[shift]) * symbol_len / Const::TwoPi());
int pos_err = std::nearbyint(arg(tmp1[shift]) * symbol_len / Const::TwoPi());
if (abs(pos_err) > guard_len / 2)
return false;
symbol_pos -= pos_err;