Patent ID: 9692587
Date: 2017-06-27
CPC Classifications: H04B,H04L

Claim:
1. A method of phase tracking in a communication system, the method including: performing, at a receiving apparatus of the communication system, an initial frequency correction based on received symbol samples, to output first corrected samples, wherein the initial frequency correction comprises performing at least one non-data-dependent frequency estimation and correction on a single packet-length's worth of the received symbol samples, wherein a number of the received symbol samples is greater than one packet length's worth of symbol samples, wherein the initial frequency correction further comprises iteratively stepping through packet-length sets of the received symbol samples to obtain the single packet-length's worth of received symbol samples, and wherein the iteratively stepping through packet-length sets of the received symbol samples comprises: extracting a symbol block containing one packet-length's worth of received symbol samples; performing non-data-dependent frequency estimation and correction on the symbol block to obtain frequency-adjusted symbol samples; correlating the frequency-adjusted symbol samples with a packet sync pattern; and identifying the packet start sample by the correlation value with maximum magnitude; performing, at the receiving apparatus, a second frequency correction and initial phase correction on the first corrected samples to output second corrected samples; and performing, at the receiving apparatus, pilot symbol-aided phase tracking/correction to the second corrected samples.