Patent ID: 8155250
Filing Date: 2012-04-10
Classification: H04L

Abstract:
1. A receive path in a receiver comprising: means for deriving at least a first stream of first digitized samples from a received analog signal at a first sampling rate, means for identifying a first frequency offset based on a plurality of parallel correlations, each correlation correlating the first stream of the first digitized samples with a different complex reference signal of a plurality of complex reference signals, wherein the plurality of complex reference signals differ from each other by phase offsets; a demodulator configured to demodulate symbols from the stream of first digitized samples wherein the demodulator references each demodulated symbol to a respective value for a central symbol in rotated decision areas that are set in accordance with at least the first frequency offset; means for identifying a second frequency offset based on tracking a demodulation accuracy for each symbol which is demodulated from the first stream of the first digitized samples; and means for adjusting a setting of the rotated decision areas in accordance with the second frequency offset.