Extended MLSE diversity receiver for the time- and frequency-selective channel

被引:20
作者
Hart, B
Taylor, DP
机构
[1] Department of Electrical and Electronic Engineering, University of Canterbury, Christchurch
关键词
diversity; fading; maximum likelihood; receiver;
D O I
10.1109/26.558693
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
This paper develops a maximum-likelihood sequence estimation (MLSE) diversity receiver for the time- and frequency-selective channel corrupted by additive Gaussian noise when linear constellations (M-ASK, M-PSK, M-QAM) are employed, The paper extends Ungerboeck's derivation of the extended MLSE receiver for the purely frequency-selective channel to the more general channel, Although the new receiver structure and metric assume ideal channel-state information (CSI), the receiver can be used wherever high-quality CSI is available, such as a comb of pilot tones or time-isolated symbols, The major contributions of this paper are as follows: 1) the derivation of a finite-complexity diversity receiver that is maximum likelihood (ML) for all linear channel models and sources of diversity, as long as ideal CSI is available; 2) a benchmark, in that the new receiver's performance is a lower bound on the performance of practical systems, which either lack ideal CSI or are not ML; 3) insight into matched filtering and ML diversity receiver professing for the time- and frequency-selective channels; and 4) bounds on the new receiver's bit-error rate (BER) for ideal CSI and pilot tone CSI, in a fast Rayleigh-fading channel with multiple independently faded paths. The new receiver can seamlessly tolerate square-root Nyquist pulses without a fading-induced ISI error floor.
引用
收藏
页码:322 / 333
页数:12
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