US 8,045,600 B2 · Method and apparatus for compensating for processing timing misalignment in a communication receiver

Abstract

According to the teachings presented herein, a wireless communication apparatus compensates for timing misalignment in its received signal processing. In at least one embodiment, the apparatus estimates a set of path delays for a received signal and sets processing delays on the estimated path delays. The apparatus jointly hypothesizes combinations of fractional timing offsets for two or more paths, and computes a decision metric for each joint hypothesis that indicates the accuracy of the joint hypothesis. As non-limiting examples, the decision metric may be a signal quality metric, or a distance metric (such as between a measured net channel response and an effective net channel response reconstructed as a function of the combination of fractional timing offsets included in the joint hypothesis). The apparatus evaluates the decision metrics to identify a best estimate of timing misalignment, and correspondingly compensates coherent processing of the received signal.

Claims30

Dependent claims

A method of compensating for processing timing misalignment in a communication receiver comprising:

estimating a set of path delays for a received signal according to a first timing resolution, said set of estimated path delays corresponding to actual path delays of the received signal;
setting a processing delay on each estimated path delay according to a second timing resolution, such that each processing delay is aligned with a respective one of the estimated path delays;
estimating a timing misalignment between each one of two or more of the processing delays and the corresponding actual path delays by:
forming a number of joint hypotheses, each joint hypothesis being a particular combination of one fractional timing offset value for each of the two or more processing delays, each such fractional timing offset value representing a hypothesized misalignment between the processing delay and the corresponding actual path delay;
computing a decision metric for each joint hypothesis that indicates the accuracy of the joint hypothesis;
and
evaluating the decision metrics to identify a best estimate of timing misalignment for the two or more estimated path delays;
and
compensating coherent processing of the received signal according to the best estimate of timing misalignment.

6 more elements

A wireless communication apparatus configured to compensate for received signal processing timing misalignment, the wireless communication apparatus comprising one or more processing circuits configured to:

estimate a set of path delays for a received signal according to a first timing resolution, said set of estimated path delays corresponding to actual path delays of the received signal;
set a processing delay on each estimated path delay according to a second timing resolution, such that each processing delay is aligned with a respective one of the estimated path delays;
estimate a timing misalignment between each one of two or more of the processing delays and the corresponding actual path delays by:
forming a number of joint hypotheses, each joint hypothesis being a particular combination of one fractional timing offset value for each of the two or more processing delays, each such fractional timing offset value representing a hypothesized misalignment between the processing delay and the corresponding actual path delay;
computing a decision metric for each joint hypothesis that indicates the accuracy of the joint hypothesis;
and
evaluating the decision metrics to identify a best estimate of timing misalignment for the two or more estimated path delays;
and
compensate coherent processing of the received signal according to the best estimate of timing misalignment.

6 more elements

Dependencies are inferred from the claim text.

Method and apparatus for compensating for processing timing misalignment in a communication receiver

Life of this patent

Method and apparatus for compensating for processing timing misalignment in a communication receiver

Life of this patent

Abstract

Claims30