Journal of Computer Applications ›› 2011, Vol. 31 ›› Issue (03): 643-646.DOI: 10.3724/SP.J.1087.2011.00643
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ZHANG You-yan
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张莜燕
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Abstract: The antenna diversity based on Log-Likelihood Ratio (LLR) is a new technique which is better than that based on Signal-to-Noise Ratio (SNR) in code-error rate performance, and it provides a significant reduction in complexity and cost. In this paper, the new technique of transmit antenna selection based on LLR was studied and the expressions of transmit antenna selection schemes based on Symbol-LLR (SLLR) and Bit-LLR (BLLR) over Multi-Input Multi-Output (MIMO) Nakagami channel were derived. At the same time, the average Bit-Error Rate (BER) performance of M-ary modulated system was studied. The simulation results show that the BLLR scheme is optimum since it minimizes the BER of MIMO system. With the same total number of antennas, the system which possesses the higher diversity order exhibits better performance. Moreover, with the same diversity order, the BER performance is more preferable due to the higher number of receive antennas.
Key words: Log-Likelihood Ratio (LLR), transmit antenna selection, fading channel, Multiple-Input Multiple-Output (MIMO) system, antenna diversity
摘要: 基于对数似然比(LLR)的天线分集是误码性能优于传统基于信噪比(SNR)天线分集的一种新技术,并降低了系统的实现复杂性和成本。为此对基于LLR的发射天线选择新技术进行了研究,推导了多输入多输出(MIMO)Nakagami衰落信道上基于符号对数似然比(SLLR)和比特对数似然比(BLLR)的发射天线选择准则,并对M进制调制系统进行仿真研究。结果表明,基于BLLR准则的MIMO系统误比特率最小;采用SLLR准则和BLLR准则时,在保持发射端和接收端的天线总数不变的条件下,分集数量级大的系统误比特率性能好;数量级相等时,接收天线较多的系统性能较优。
关键词: 对数似然比, 发射天线选择, 衰落信道, 多输入多输出系统, 天线分集
CLC Number:
TP391
TP393.02
ZHANG You-yan. Transmit antenna selection based on log-likelihood ratio[J]. Journal of Computer Applications, 2011, 31(03): 643-646.
张莜燕. 基于对数似然比的发射天线选择[J]. 计算机应用, 2011, 31(03): 643-646.
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URL: http://www.joca.cn/EN/10.3724/SP.J.1087.2011.00643
http://www.joca.cn/EN/Y2011/V31/I03/643