摘要
介绍了多入多出系统中的空时、空频编码技术,并在此基础上将OFDM技术与MIMO系统相结合,研究了STBC-OFDM、SFBC-OFDM及VBLAST-OFDM系统。对该系统性能进行了分析和仿真,结果表明VBLAST系统传输速率最高,其速率至少是分组码MIMO-OFDM系统的2倍,但是其误码性能相对较差,误码率为0.001时,VBLAST-OFDM系统所需的信噪比比分组码系统要高9.3dB。
This paper introduces the space-time coding and the space-frequency coding technologies of a Multi-Input and Multi-Output（MIMO） system. We combine the Orthogonal Frequency divided Multiplex （OFDM） with MIMO system and research on several MIMO-OFDM systems, for example, Space-Time Block Coding （STBC） OFDM system, Space-Frequency Block Coding（SFBC） OFDM system, and Vertical Bell Laboratories Layered Space Time （VBLAST）-OFDM system. Analysis and simulation of these MIMO-OFDM systems＇ performance are examined. The results show that the data rate of the VBLAST-OFDM system is the highest, which is at least the twice as high as that of the STBC-OFDM or SFBC-OFDM system. However Bit Error Rate（BER） performance of the VBLAST-OFDM system is worse than that of the others. When BER is equal to 0.001, the required signal-noise ratio for VBLAST-OFDM system is 9.3dB more than that for the STBC or SFBC and OFDM system. On the other hand, the complexity of the VBLAST-OFDM system is higher than that of the STBC or SFBC and OFDM systems.
出处
《电子科技大学学报》
EI
CAS
CSCD
北大核心
2007年第2期176-178,206,共4页
Journal of University of Electronic Science and Technology of China
基金
国家自然科学基金资助项目(60672038)
关键词
多输入多输出
正交频分复用
空频编码
空时编码
multi-input multi-output
orthogonal frequency divided multiplex
space-frequency block coding
space-time block coding
