A CODED 16-QAM SCHEME FOR FAST FADING MOBILE RADIO CHANNELS

被引：12

作者：

SUBASINGHEDIAS, D ^{[1
]}

FEHER, K ^{[1
]}

机构：

[1] UNIV CALIF DAVIS, DIGITAL COMMUN RES GRP, DAVIS, CA 95616 USA

来源：

IEEE TRANSACTIONS ON COMMUNICATIONS | 1995年 / 43卷 / 05期

关键词：

D O I：

10.1109/26.387411

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

An adaptive Viterbi algorithm, derived from a dynamic estimate of the fading channel is used for the decoding of a convolutional coded 16 QAM system in a mobile environment, The estimates are obtained by a sequence of known pilot symbols embedded in the-data stream, and perform compensation for Rayleigh fading. The likelihood criterion in the Viterbi decoder is also modified by these channel estimates through a metric weighting function. We demonstrate through computer simulations, that our new technique achieves a BER improvement of 7-10 dB at P-e=10(-3) in a fast flat Rayleigh fading environment compared to an uncoded system. The BER performance of our new technique in a CCI controlled environment is also studied, and the results show that it may achieve a 40% to 85% improvement in capacity over the standard modem scheme for the new U.S. digital cellular system, pi/4-QPSK.

引用

页码：1906 / 1916

页数：11

共 27 条

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