Patent ID: 9537683
Date: 2017-01-03
CPC Classifications: H04L

Claim:
1. A method of residual carrier recovery of a received modulated signal performed by a digital signal processing apparatus implemented at least partially in hardware, the method comprising: performing a coarse carrier compensation of the received modulated signal to obtain a coarse carrier compensated signal; performing a trellis-based residual carrier recovery to estimate a residual phase noise of the coarse carrier compensated signal; and compensating the coarse carrier compensated signal based on the estimated residual phase noise, wherein performing the trellis-based residual carrier recovery comprises: constructing a trellis comprising L trellis stages and M states corresponding to M possible residual phase noise values of the coarse carrier compensated signal; and traversing the L trellis stages of the trellis to trace a most likely residual phase noise as the residual phase noise of the coarse carrier compensated signal.