Patent ID: 8982987
Filing Date: 2015-03-17
Classification: H04L

Abstract:
1. A method of operating an orthogonal frequency-division multiplexing (OFDM) receiver, comprising: receiving, via an antenna, successive pairs of OFDM symbols, the OFDM symbols of the successive pairs comprising pilot symbols on distinct respective subsets of a plurality of subcarriers, that are the same for both OFDM symbols in each pair, both OFDM symbols of each of the successive pairs having pilot symbols on a respective subset of the plurality of subcarriers, the pilot symbols of each of the successive pairs composing an orthogonal matrix, the respective subsets being symmetric about the center carrier frequency; estimating frequency responses at frequencies of the respective subsets of the plurality of subcarriers using the pilot symbols; and compensating for signal impairment based at least in part on the estimated frequency responses at the frequencies of the respective subsets of the plurality of subcarriers.