cellular-infrastructure
/
osmo-trx
mirror of https://gerrit.osmocom.org/osmo-trx
9
0
Fork 0
Code Issues Projects Releases Wiki Activity
Osmocom GSM/GPRS/EGPRS transceiver, originally forked from OpenBTS transceiver. For building SDR based GSM BTS with osmo-bts-trx.
109 Commits 50 Branches 22 Tags 11 MiB
C++ 67.8%
C 23.5%
M4 4.2%
Makefile 1.9%
Assembly 1.2%
Other 1.4%
Go to file
ttsou bec41039bf Transceiver52M: Fix calculation of TS correlation for 2 sps and higher 
The correlation starting point for normal burst training sequence
calculation should be a scaled value of the same symbol regardless
of the samples-per-symbol used. Use of 2 samples-per-symbols double
the index values, but yields the following outputs, which results
in a late time-of-arrival value at the output of the correlation.

This patch modifies the parameter calculation accordingly.

1 sps parameters

maxTOA = 3
spanTOA = 5;
startIx = 61;
endIx = 87;
windowLen = 26;
corrLen = 7;

2 sps parameters (errant case)

maxTOA = 6;
spanTOA = 10;
startIx = 112;
endIx = 184;
windowLen = 72;
corrLen =13;

2 sps parameters (corrected)

maxTOA = 6;
spanTOA = 10;
startIx = 122;
endIx = 174;
windowLen = 52;
corrLen =13;

Signed-off-by: Thomas Tsou <tom@tsou.cc>

git-svn-id: http://wush.net/svn/range/software/public/openbts/trunk@5183 19bc5d8c-e614-43d4-8b26-e1612bc8e597
 		2013-04-04 23:35:08 +00:00
CommonLibs Synced sqlite3utils with private and fixed a small recursive bug in SIPEngine that was already fixed in private 2013-02-15 02:57:54 +00:00
Transceiver52M Transceiver52M: Fix calculation of TS correlation for 2 sps and higher 2013-04-04 23:35:08 +00:00