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Research on concatenated trellis-coded modulation system combined with space-time coding over frequency selective fading channel

频率选择性衰落信道上结合空时编码的级联网格编码调制系统研究

基本信息

批准号：
15560321
负责人：
OGIWARA Haruo
金额：
$ 2.24万
依托单位：
Nagaoka University of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

项目摘要

1.Transmission DiversityThe transmit diversity system proposed by Lindskog, which is an extension of the diversity system proposed by Alamouti, has been extended for frequency selective fading channel. This research has studied combinations of the Lindskog system with parallel or serial concatenated trellis-coded modulation.Though the Lindskog system can separate signals from two transmit antennas, inter-symbol interference remains for frequency selective fading channel. When higher transmission speed is necessary, the inter-symbol interference happens over more symbols. Decision aided equalization has been adopted as it require practical amount of signal processing task even for such circumstance. Computer simulation results has shown that the system combined with parallel concatenated trellis-coded modulation realizes 6dB diversity gain by using two transmit antenna and 3.5dB coding gain at the bit error rate (BER)10^<-2>. It has also shown that the system combined with serial concatenated trellis-coded modulation realizes 4.5dB diversity gain and 10.5dB coding gain at BER=10^<-4>.2.Hardware design of concatenated trellis-coded modulationIn 2003, a hardware decoder for the concatenated trellis-coded modulation has been designed for 8-PSK modulation.In 2004 a hardware decoder which can be adopted for higher order modulation and requires less amount of signal processing task has been proposed and implemented on a field programmable gate array (FPGA).3.Optimization of codingOptimum code has been searched under the assumption of many diversity paths by using theoretically derived upper bounds of BER.

1.传输分集Lindskog提出的传输分集系统是Alamouti提出的分集系统的扩展，针对频率选择性衰落信道进行了扩展。本研究研究了Lindskog系统与并行或串行级联网格编码调制的组合。虽然Lindskog系统可以分离来自两个发射天线的信号，但频率选择性衰落信道仍然存在符号间干扰。当需要更高的传输速度时，符号间干扰会发生在更多的符号上。决策辅助均衡已被采用，因为即使在这种情况下，它也需要实际数量的信号处理任务。计算机仿真结果表明，该系统结合并行级联网格编码调制，在误码率(BER)10^<-2>下，利用两个发射天线实现了6dB的分集增益和3.5dB的编码增益。还表明，该系统与串行级联网格编码调制相结合，在BER=10^<-4>时实现了4.5dB分集增益和10.5dB编码增益。2.级联网格编码调制的硬件设计2003年，针对8-PSK调制设计了级联网格编码调制的硬件解码器。2004年设计了可采用的级联网格编码调制硬件解码器。提出并在现场可编程门阵列（FPGA）上实现了高阶调制并需要较少的信号处理任务。3.编码优化在许多分集路径的假设下，使用理论上推导的BER上限搜索了最佳编码。