US 7,548,587 B2 · Methods and apparatus for use in reducing residual phase error in OFDM communication signals

Abstract

Methods and apparatus for use in reducing residual phase error (RPE) in orthogonal frequency division multiplexed (OFDM) communication signals are described. One method includes the steps of calculating a phase of each one of a plurality of channel-compensated data symbols to generate a plurality of data symbol phases; performing a hard-decision on each one of the plurality of channel-compensated data symbols to estimate a plurality of information symbols; calculating a phase of each one of the plurality of information symbols to generate a plurality of information symbol phases; calculating a phase difference between each data symbol phase and its associated information symbol phase to generate a plurality of phase differences; and determining a residual phase error based on the plurality of phase differences.

Claims15

Dependent claims

A method for use in reducing a residual phase error in orthogonal frequency division multiplexed (OFDM) communications signals, the method comprising:

calculating a phase of each one of a plurality of channel-compensated data symbols to generate a plurality of data symbol phases;
performing a hard-decision on each one of the plurality of channel-compensated data symbols to estimate a plurality of information symbols;
calculating a phase of each one of the plurality of information symbols to generate a plurality of information symbol phases;
calculating a phase difference between each data symbol phase and its associated information symbol phase to generate a plurality of phase differences;
and
determining a residual phase error based on the plurality of phase differences.

3 more elements

An apparatus comprising:

a channel estimator configured to generate a channel estimate;
a first channel compensator configured to generate a channel-compensated signal at least partially based on a received signal and the channel estimate;
a residual phase error estimator configured to estimate a residual phase error at least partially based on a plurality of phases of the channel-compensated signal and a plurality of phases of a sliced channel-compensated signal and configured to correct the channel estimate at least partially based on the residual phase error estimate, to thereby generate a corrected channel estimate;
and
a second channel compensator configured to generate a compensated received signal at least partially based on the received signal and the corrected channel estimate.

2 more elements

A method comprising:

generating a channel estimate;
generating a first compensated received signal at least partially based on a received signal and the channel estimate to thereby generate a channel-compensated signal;
estimating a residual phase error at least partially based on a plurality of phases of the channel-compensated signal and a plurality of phases of a sliced channel-compensated signal to thereby generate a residual phase error estimate;
correcting the channel estimate at least partially based on the residual phase error estimate, to thereby generate a corrected channel estimate;
and
generating a second compensated received signal at least partially based on the received signal and the corrected channel estimate.

3 more elements

Dependencies are inferred from the claim text.

Methods and apparatus for use in reducing residual phase error in OFDM communication signals

Life of this patent

Methods and apparatus for use in reducing residual phase error in OFDM communication signals

Life of this patent

Abstract

Claims15