Phase correction method and apparatus for wireless spread spectrum receiver

摘要

Phases of the spread spectrum signal are corrected with a high degree of accuracy by a minimum of circuitry. One of phase correction circuits 31 - 34 of the receiver corresponds to each path. The I-component and Q-component of a despread output are supplied to the phase correction circuits 31 - 34. A phase error extractor 1 extracts the first phase error from a received pilot block. A phase corrector 2 corrects the phase error of a received information symbol using a correction vector that has been calculated based on the first phase error. The RAKE synthesizer 25 synthesizes the corrected received signal with outputs of the phase correction circuits of other paths and outputs the synthesized signal to a temporary determiner 3 which temporarily determines an information symbol to be processed. The phase error is modified in a correction vector modifier 4 using the temporary determination result. A new correction vector is calculated based on the modified phase error. In this way, the correction vectors are sequentially modified based on the temporary determination results for the information symbols.