Paired OFDM pilot symbols

摘要

Successive pairs of OFDM symbols are transmitted by an OFDM transmitter and received by an OFDM receiver. The successive pairs include a first pair of OFDM symbols. First and second OFDM symbols of the first pair both include pilot symbols on two subcarriers that are symmetric about a center carrier frequency. The two subcarriers are the same for the first and second OFDM symbols. The pilot symbols on the two subcarriers for the first and second OFDM symbols compose an orthogonal matrix. The OFDM receiver estimates frequency responses at frequencies including the frequencies of the two subcarriers and compensates for signal impairment based at least in part on the estimated frequency responses.

主权项

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.