Patent ID: 8019014
Filing Date: 2011-09-13
Classification: H04B,H04L

Abstract:
1. A pre-coding apparatus on account of adaptive estimation, being configured to make a transmitter compensate a transmitted signal in advance according to a channel information from an end-user receiver, to increase stability and efficiency of a communication system and decrease complexity of the end-user receiver, the pre-coding apparatus comprising: a plurality of channel-information detectors, being configured to estimate the channel information of a channel according to a known training sequence transmitted in advance; a reduction sampler, being configured to modulate number of sampling points of the channel information according to variation frequency of the channel, and properly reduce feedback data that feed back to the transmitter for pre-coding; a plurality of adaptive estimators, being configured to estimate, code, decode, and compress the channel information; an error-estimation averager, being configured to estimate average value of errors of estimations according to results of the adaptive estimators; and a parallel/serial transducer, being configured to transduce results of the adaptive estimators in parallel into a serial output for being fed back to the transmitter, wherein the plurality of adaptive estimators are an adaptive estimating coder of an end-user host and an adaptive estimating decoder of a base station respectively, and the adaptive estimating coder of the end-user host comprises: an adaptive filter an adaptive filter a step resolver, being configured to generate short-term variation of the step; an adder a multiplier, being configured to multiply the two step estimations by a previous feedback information bit to compensate correctly; an adder a subtracter, being configured to subtract an estimation value from the channel frequency response; and a decision unit, being configured to decide the previous feedback information bit.