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5 bit ramp-up/ramp-down

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This commit is contained in:
Alexander Chemeris
2015-06-30 19:47:57 -04:00
parent b4a046c901
commit 3f09245749
1 changed files with 4 additions and 3 deletions
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7
Transceiver52M/sigProcLib.cpp
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@@ -794,7 +794,7 @@ static signalVector *modulateBurstLaurent(const BitVector &bits,
* Generate shaping mask with squared-cosine pulse. Only 4 samples-per-symbol
* is supported here so use length of 8 samples or 2 symbols.
*/
int len = 8;
int len = 20;
float mask[len];
for (i = 0; i < len; i++)
mask[i] = 0.5 * (1.0 - cos(M_PI * (float) i / len));
@@ -807,7 +807,7 @@ static signalVector *modulateBurstLaurent(const BitVector &bits,
* Delay ramp by 1 sample
*/
i = 0;
int start = 8 + head * sps - len + 1;
int start = 8 + head * sps - len + 1 + 4;
for (;i < len; i++)
c2_shaped->begin()[i] = mask[i] * c0_shaped->begin()[start + i];
@@ -820,7 +820,8 @@ static signalVector *modulateBurstLaurent(const BitVector &bits,
* 148 useful bits
*/
int j;
int end = len + 148 * sps;
int end = len + 148 * sps - 8;
assert(end + len < 625);
for (i = end, j = 0; i < end + len; i++, j++)
c2_shaped->begin()[i] *= mask[len - j - 1];
for (; i < 625; i++)