Pulse or digital communications – Receivers – Automatic frequency control
Patent
1996-08-21
1999-02-23
Chin, Stephen
Pulse or digital communications
Receivers
Automatic frequency control
375231, 375325, 375326, 375324, 375232, 375233, 375332, H04L 2706
Patent
active
058752153
ABSTRACT:
A carrier synchronizing unit for a coherent detection data communication system over non-frequency selective fading channels wherein the redundancy in estimation of a fading channel multiplicative distortion is reduced to improve the reliability of the estimation and compensate for an influence of a tracking delay in recursive least square estimation. The carrier synchronizing unit combines pilot symbols interpolation and recursive least square type phase and amplitude estimation. Carrier synchronizing unit comprises pilot symbol interpolation type phase and amplitude means for interpolating pilot symbols to estimate fading channel multiplicative distortion for the purpose of pre-detection, recursive least square type phase and amplitude estimation means to estimate fading channel multiplicative distortion in the second estimation stage, distortion compensation means to compensate fading distortion, symbol decision means for deciding a received data symbols using coherent detection, delay means for delaying a received signal, and means for periodically training of the recursive least square type phase and amplitude means. The fading channel multiplicative distortion is estimated in the second stage using a recursive least square method which minimizes a time-weighted square error.
REFERENCES:
patent: 5140615 (1992-08-01), Jasper et al.
patent: 5293401 (1994-03-01), Serfaty
patent: 5659578 (1997-08-01), Alamouti et al.
The Transactions of the Institute of Electronics, Information And Communication Engineers, vol. J72-B-II No. 1, Jan. 1989, pp. 1-62., Rayleigh Fading Compensation Method for 16QAM Modem in Digital Land Mobile Radio Systems, Seiichi Sampei.
The Institute of Electronics Information and Communication Engineers, Performance of Coherent RAKE Detection using Interpolation on DS/CDMA, Akihiro Higashi, Tsutomu Taguchi, and Koji Ohno, vol. 94 No. 312. Oct. 1994.
Chin Stephen
Le Tuan
NEC Corporation
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