Patent ID: 9258150
Filing Date: 2016-02-09
CPC Classification: H04L

Claim Text:
1. A method of obtaining a channel estimate in a receiver, comprising: receiving a baseband signal having a cyclic prefix, the baseband signal corresponding to a channel; removing the cyclic prefix from the baseband signal; transforming the baseband signal from a time domain to a frequency domain to yield a baseband signal in the frequency domain; compensating the baseband signal in the frequency domain by a first time offset of the received baseband signal to yield a compensated baseband signal in the frequency domain; extracting a subcarrier used to transmit the baseband signal from the compensated baseband signal in the frequency domain to yield a raw channel estimate; determining adjacent subcarriers having channel responses highly correlated to that of the subcarrier; compensating the raw channel estimate in the frequency domain by a second time offset to yield a compensated raw channel estimate, where the second time offset corresponds to a minimal angle of the autocorrelation function of the subcarrier and the adjacent subcarriers; and filtering the compensated raw channel estimate with a filter to yield the filtered channel estimate, wherein a filter length of the filter corresponds to a total number of the subcarrier and the adjacent subcarriers; wherein the filtering operation comprises: filtering, in frequency domain, the compensated raw channel estimate using a linear filter; and interpolating the compensated raw channel estimate using an interpolation filter.