Phase noise mitigation for wireless communications

摘要

A method and apparatus for tracking and mitigating phase noise in a communication receiver are disclosed. The phase noise tracking and mitigation apparatus operates in a recursive manner and includes a quantizer for determining data symbols from noise-compensated input values, a phase noise estimator for determining raw phase noise values from the data symbols and a first sequence of uncompensated input values, an error concealment module for removing unreliable samples from the raw phase noise values, a filter operable to filter the raw phase noise values to produce filtered phase noise values, and a phase-noise compensator for determining noise-compensated output values dependent upon the filtered phase noise values and the first sequence of uncompensated input values. Filter coefficients, and initial noise-compensated input values are determined from one or more second sequences of uncompensated input values corresponding to known symbols corrupted by phase noise.

主权项

1. A method for reducing phase noise in a communication receiver, the method comprising:
receiving a first sequence of input values, each input value comprising an unknown data symbol corrupted by phase noise; determining a first sequence of data symbols from the first sequence of input values; determining a sequence of raw phase noise values from both the first sequence of input values and the first sequence of data symbols; filtering the sequence of raw phase noise values to provide a first sequence of filtered phase noise values; and compensating the first sequence of input values using the first sequence of filtered phase noise values to provide a sequence of compensated input values; for one or more iterations until a termination condition is met, performing the elements:
determining a second sequence of data symbols from the sequence of compensated input values;determining a new sequence of raw phase noise values from both the sequence of compensated input values and the second sequence of data symbols;filtering the new sequence of raw phase noise values to provide a second sequence of filtered phase noise values; andcompensating the first sequence of input values using the second sequence of filtered phase noise values to update the sequence of compensated input values; andoutputting the updated sequence of compensated input values.