Coded unitary space-time modulation with iterative decoding: Error performance and mapping design

被引:17
作者
Tran, Nghi H. [1 ]
Nguyen, Ha A.
Le-Ngoc, Tho
机构
[1] Univ Saskatchewan, Dept Elect Engn, Saskatoon, SK S7N 5A9, Canada
[2] McGill Univ, Dept Elect & Comp Engn, Montreal, PQ H3A 2A7, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
bit-interleaved coded modulation (BICM); error bound; error performance; iterative decoding; signal mapping; space-time modulation; unitary constellation;
D O I
10.1109/TCOMM.2007.894092
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 studies the bit error probability of coded unitary space-time modulation with iterative decoding where neither the transmitter nor the receiver knows the channel fading coefficients. The tight error bound with respect to the asymptotic performance is first analytically derived for any given unitary constellation and mapping rule. Design criteria regarding the choice of unitary constellation and mapping are then established. Furthermore, using the unitary constellation obtained from orthogonal design with quadrature phase-shift keying (QPSK or 4-PSK) and 8-PSK, two different mapping rules are proposed. The first mapping rule gives the most suitable mapping for systems that do not implement iterative processing, which is similar to a Gray mapping in coherent channels. The second mapping rule yields the best mapping for systems with iterative decoding. In particular, analytical and simulation results show that with the proposed mappings of the unitary constellations obtained from orthogonal designs, the asymptotic error performance of the iterative systems can closely approach a lower bound which is applicable to any unitary constellation and mapping.
引用
收藏
页码:703 / 716
页数:14
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