tree db531cac4588324ec341365fce794043147aa270
parent 6a2bf0d87b215860e76d1866885ae552b0ba63fe
author Alexander Chemeris <Alexander.Chemeris@gmail.com> 1432513011 -0400
committer Tom Tsou <tom.tsou@ettus.com> 1433199971 -0700

sigProcLib: Fix burst start phase.

R&S CMD57 complains about the start phase of bursts, particularly it shows
-15 to -30 deg of error for the bit 0.5 position (start tail bit). This patch
makes it happy. ETSI TS 145 004 section 2.2 describes this: "Before the first
bit of the bursts as defined in 3GPP TS 45.002 enters the modulator,
the modulator has an internal state as if a modulating bit stream consisting
of consecutive ones (di = 1) had entered the differential encoder."

Signed-off-by: Tom Tsou <tom.tsou@ettus.com>