3 Nov
2017
3 Nov
'17
1:24 p.m.
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http://cgit.osmocom.org/libosmocore/commit/?id=c526dbc24f3ec95771085967b9e3…
commit c526dbc24f3ec95771085967b9e300c9f9d4fc1f
Author: Niro Mahasinghe <niroshan(a)cellXica.net>
Date: Fri Nov 3 12:24:30 2017 +0100
gsm0503_coding.c: Use majority vote in tch_efr_unreorder()
The EFR coding contains some repeated bits. In case there are
transmission errors, some bits may of course get corrupted. It looks
like there's an improvement can be made by taking a majority vote on
those "repetition bits", i.e. if 2 out of 3 bits are the same, then use
that instead of expecting to match all 3 bits.
See 3GPP TS 45.003 Section 3.1.1.3 for reference.
Change-Id: I2a28a4d7fb82aed4d39fe8efeea702effdba3858
http://cgit.osmocom.org/libosmocore/commit/?id=834e2ac0ead4544c207ed365151c…
commit 834e2ac0ead4544c207ed365151c8c898b5a949c
Author: Niro Mahasinghe <niroshan(a)cellXica.net>
Date: Fri Nov 3 12:22:34 2017 +0100
gsm0503_coding.c: Fix tch_efr_unreorder() of one bit
There's an error in tch_efr_unreorder() function in gsm0503_coding.c
that results in increased RBER. One of the indices used by repetition
bit recombining in this function doesn't match 3GPP TS 45.003 section
3.1.1.3, specifically "w(k) = s(223) for k = 231 and 232".
This bug resulted in RBER even under ideal conditions, with no
fading or AWGN present.
Change-Id: I153da7bbc1bb3e01ed31eb5a7417e90841cfcde3
-----------------------------------------------------------------------
Summary of changes:
src/coding/gsm0503_coding.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
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An utility library for Open Source Mobile Communications