Study on Spectral Efficiency Improvement by Space Time Coding Technique for High-speed High-capacity Mobile Radio Communications

高速大容量移动无线通信空时编码技术提高频谱效率的研究

基本信息

批准号：
13450157
负责人：
YOSHIDA Susumu
金额：
$ 8万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

项目摘要

In this research, space-time coding and MIMO channel transmission are investigated in order to further improve the spectral efficiency of radio communication systems. In these techniques, multiple co-channel signals are transmitted at the same time from different transmitting antennas. This transmission technique offers diversity effect when the signals carry the same information; otherwise this scheme improves the spectral efficiency by simultaneous radiation of multiple signals modulated by different information. The trellis-coded co-channel interference canceller (TCC), which is proposed by our research group, is a form of space-time coding and MIMO channel transmission in multiuser communication scenarios. In this research, the number of antennas assumed in TCC is enlarged to extend the TCC to a more aggressive MIMO transmission scenario. Then the signal processing technique and coding technique areinvestigated for MIMO-TCC. Also inlab experiments using RF equipments are conducted to confirm the performance of the TCC. The major results of this research are as follows:1) In spatial multiplexing systems, TCC can outperform the well-known BLAST scheme because the TCC is based on the optimum signal processing approach, even when the complexity of TCC is reduced.2) TCC is confirmed to be robust against correlation among receiving antennas owing to its trellis coding technique.3) The coding scheme for TCC has much space to improve. In this research, new coding scheme is found to lower the bit error rate.4) The computational complexity of the TCC can be greatly reduced with a small penalty of performance.5) With channel estimation, TCC outperforms space-time coding, which offers good diversity gain by the multiple transmission of the same information.6) In-lab experiments of TCC are conducted, and the results agree well with that of computer simulations.

在这项研究中，研究了时空编码和MIMO通道传输，以进一步提高无线电通信系统的光谱效率。在这些技术中，从不同的传输天线从不同的传输天线传输了多个共通道信号。当信号带有相同的信息时，这种传输技术会产生多样性效果。否则，该方案通过同时通过不同信息调节的多个信号来提高光谱效率。由我们的研究小组提出的格子编码的共渠道干扰癌（TCC）是一种时空编码和MIMO通道传输的一种形式。在这项研究中，TCC中假设的天线数量扩大，以将TCC扩展到更具侵略性的MIMO传输方案。然后，对MIMO-TCC进行了信号处理技术和编码技术。还进行了使用RF设备的INLAB实验，以确认TCC的性能。这项研究的主要结果如下：1）在空间多路复用系统中，TCC可以胜过众所周知的爆炸计划，因为TCC基于最佳信号处理方法，即使TCC的复杂性降低了。2）TCC确认TCC在接收天线的相关性方面是牢固的。在这项研究中，发现新的编码方案降低了位错误率。4）TCC的计算复杂性可以通过少量的性能惩罚大大降低。5）5）随着渠道估计，TCC超过了时空编码，这可以通过同一信息的多重传输来获得良好的多样性获得。6）在TCC实验中进行了TCC实验，并与TCC实验进行了与计算机的良好同意。