| 摘要 |
An RF receiver ( 12 ) includes a channel estimator ( 52 ). The channel estimator ( 52 ) includes a channel estimation filter ( 82 ), error signal generator ( 84 ), and normalized Least-Mean-Square (NLMS) filter-definition generator 36. The filter ( 82 ), error generator ( 84 ) and NLMS filter-definition generator ( 86 ) function together as an adaptive estimator. An error signal ( 90 ) is formed with a received signal ( 48 ). The filter ( 82 ) filters an estimated transmit signal ( 74 ) constructed from lower confidence decision data ( 66 ) and higher confidence known preamble data ( 30'' ). .An adaptive filter definition ( 94 ) is formed in a feedback, loop which minimizes correlation between the estimated transmit signal ( 74 ) and the error signal ( 90 ). A convergence signal ( 122 ) is modulated in synchronism with the changes between lower and higher confidence data in the estimated transmit signal ( 74 ).
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