Patch Set 1: > > Tom, could you explain why did you set search window to -/+6 > > symbols? My experiments showed that at least `tail` should be set > > to 3 in order for `max_toa` to actually represent maximum TOA. > And > > same for `head` - from my experiments I think it should be 3. > > Previous pre-search or 'head' settings on normal have come from > experimentation. > > In number of symbols: > > 5 - Original OpenBTS / Range Networks > 4 - Reduced during filter & SSE rewrite > 6 - Expanded in e90c24c8 to account for timestamp jitter in certain > configurations > > With 3 symbols, have you checked TSC timing stability in the 4/1 > sps mode where jitter is/was most severe?
That's an interesting point. I so far has tested in a receive only application where there is no Rx/Tx difference issues - we always do blind detection. Btw, if I understand correctly what you're talking about - it's not "jitter", i.e. it doesn't change in time, there is an error which is static after PLL has been locked. I think we should deal with it by setting max_toa accordingly instead of changing these fundamental values. -- To view, visit https://gerrit.osmocom.org/2765 To unsubscribe, visit https://gerrit.osmocom.org/settings Gerrit-MessageType: comment Gerrit-Change-Id: If3cb40d2311504a13c03e1fbccad663ac201d9a4 Gerrit-PatchSet: 1 Gerrit-Project: osmo-trx Gerrit-Branch: master Gerrit-Owner: Alexander Chemeris <alexander.cheme...@gmail.com> Gerrit-Reviewer: Alexander Chemeris <alexander.cheme...@gmail.com> Gerrit-Reviewer: Harald Welte <lafo...@gnumonks.org> Gerrit-Reviewer: Jenkins Builder Gerrit-Reviewer: Tom Tsou <t...@tsou.cc> Gerrit-HasComments: No
