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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.

为了进一步提高无线通信系统的频谱效率，本研究对空时编码和MIMO信道传输进行了研究。在这些技术中，从不同的发射天线同时发射多个同信道信号。当信号携带相同的信息时，该传输技术提供分集效应；否则，该方案通过同时辐射由不同信息调制的多个信号来提高频谱效率。格状编码共信道干扰抵消器(TCC)是本课题组在多用户通信环境下提出的一种空时编码和MIMO信道传输方式。在本研究中，增加了TCC中所假设的天线数目，以将TCC扩展到更具侵略性的MIMO传输场景。然后研究了MIMO-TCC的信号处理技术和编码技术。此外，还利用射频设备进行了实验室实验，以验证TCC的性能。本文的主要研究结果如下：1)在空分多路复用系统中，由于基于最优信号处理方法的TCC在复杂度降低的情况下仍能获得比BLAST方案更好的性能。2)由于采用格状编码技术，TCC对接收天线间的相关性具有较强的鲁棒性。3)TCC的编码方案还有很大的改进空间。提出了一种新的编码方案，降低了误码率。4)在性能损失较小的情况下，TCC的计算复杂度大大降低。5)在信道估计方面，TCC的性能优于空时编码，后者通过多次传输相同的信息提供了良好的分集增益。6)进行了TCC的实验室实验，结果与计算机仿真结果吻合较好。