Patent ID: 6771722
Filing Date: 2004-08-03
Classification: H04L

Abstract:
A method for operating a channel estimator comprising the steps of:receiving by the channel estimator an information signal having a plurality of sequential symbols including a first plurality of sequential symbols forming a synchronous codeword and a second plurality of sequential symbols forming a data sequence, the first plurality of sequential symbols forming the synchronous codeword includes a first subset of sequential symbols and a second subset of sequential symbols; initializing a present channel estimate of the channel estimator and a rate of change of the present channel estimate of the channel estimator to a predetermined value at a symbol in the first subset of sequential symbols within the synchronous codeword; updating a future channel estimate of the channel estimator and the rate of change of the present channel estimate of the channel estimator over symbols in the first subset of sequential symbols within the synchronous codeword responsive to a first future channel estimate algorithm and a first rate of change of a present channel estimate algorithm, respectively, to cause the present channel estimate of the channel estimator to reach a steady state condition; initializing a rate of change of the future channel estimate of the channel estimator to a predetermined value at a symbol in the second subset of sequential symbols within the synchronous codeword; updating the future channel estimate of the channel estimator and the rate of change of the present channel estimate of the channel estimator over symbols in the second subset of sequential symbols within the synchronous codeword responsive to a second future channel estimate algorithm and a second rate of change of the present channel estimate algorithm, respectively, to improve a future accuracy of the channel estimator; and updating the future channel estimate of the channel estimator and the rate of change of the present channel estimate of the channel estimator over symbols in the second plurality of sequential symbols forming the data sequence responsive to a third future channel estimate algorithm and a third rate of change of the present channel estimate algorithm, respectively, to determine the present channel estimate of the channel estimator over the data sequence without substantially affecting the steady state condition of the present channel estimate or the future accuracy of the channel estimator.