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sigproc: Expand RACH, TSC, and EDGE correlation windows 

Slightly widen the search range to accommodate timing jitter
on certain classes of devices. The expanded range minimizes
the possibility of missing bursts that arrive too early or
too late due to timing error.

Signed-off-by: Tom Tsou <tom.tsou@ettus.com>
This commit is contained in:
Tom Tsou 2016-06-21 16:14:39 -07:00
parent 3b093bb13b
commit e90c24c8d5
1 changed files with 10 additions and 10 deletions
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20
Transceiver52M/sigProcLib.cpp
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@ -1858,8 +1858,8 @@ int detectGeneralBurst(signalVector &rxBurst,
*
* Correlation window parameters:
* target: Tail bits + RACH length (reduced from 41 to a multiple of 4)
* head: Search 4 symbols before target
* tail: Search 4 symbols + maximum expected delay
* head: Search 8 symbols before target
* tail: Search 8 symbols + maximum expected delay
*/
int detectRACHBurst(signalVector &rxBurst,
float thresh,
@ -1872,8 +1872,8 @@ int detectRACHBurst(signalVector &rxBurst,
CorrelationSequence *sync;
target = 8 + 40;
head = 4;
tail = 4 + maxTOA;
head = 8;
tail = 8 + maxTOA;
sync = gRACHSequence;
rc = detectGeneralBurst(rxBurst, thresh, sps, amp, toa,
@ -1887,8 +1887,8 @@ int detectRACHBurst(signalVector &rxBurst,
*
* Correlation window parameters:
* target: Tail + data + mid-midamble + 1/2 remaining midamblebits
* head: Search 4 symbols before target
* tail: Search 4 symbols + maximum expected delay
* head: Search 6 symbols before target
* tail: Search 6 symbols + maximum expected delay
*/
int analyzeTrafficBurst(signalVector &rxBurst, unsigned tsc, float thresh,
int sps, complex &amp, float &toa, unsigned max_toa)
@ -1900,8 +1900,8 @@ int analyzeTrafficBurst(signalVector &rxBurst, unsigned tsc, float thresh,
return -SIGERR_UNSUPPORTED;
target = 3 + 58 + 16 + 5;
head = 4;
tail = 4 + max_toa;
head = 6;
tail = 6 + max_toa;
sync = gMidambles[tsc];
rc = detectGeneralBurst(rxBurst, thresh, sps, amp, toa,
@ -1919,8 +1919,8 @@ int detectEdgeBurst(signalVector &rxBurst, unsigned tsc, float thresh,
return -SIGERR_UNSUPPORTED;
target = 3 + 58 + 16 + 5;
head = 5;
tail = 5 + max_toa;
head = 6;
tail = 6 + max_toa;
sync = gEdgeMidambles[tsc];
rc = detectGeneralBurst(rxBurst, thresh, sps, amp, toa,