Phase correction method and apparatus for spectrum spread wirele

Details Phase correction method and apparatus for spectrum spread wirele Phase correction method and apparatus for spectrum spread wirele

1998-01-08

2000-06-27

Bocure, Tesfaldet

Pulse or digital communications

Spread spectrum

Direct sequence

375366, H04K 100

Patent

active

060815493

ABSTRACT:
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 A 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.

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"Rayleigh Fading Compensation Method for 16QAMMODEN in Digital land Mobile Radio Systems", Seiichi SAMPEI, The Transactions of the Institute of Electronics, Information and Communication Engineers, B-11, vol. J72-B-11, No. 1, pp. 7-15, Jan. 1989.
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"The Performance of Channel Estimation Method Using Weighted Multi-Symbol Averaging (WMSA) with Pilot Chanel in DS-CDMA", Sadayuki Abeta et al., Technical Report of IEICE, The Institute of Electronics, Information and Communication Engineers.
"A Smooth Envelope Parallel Modulation/Demodulation Scheme", Shigeru Tomisato et al., Technical Report of IEICE, The Institute of Electronics, Information and Communication Engineers, pp. 59-64.

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