一种自适应MIMO信号发射与检测方法研究
doi: 10.3724/SP.J.1146.2007.00911
Research of an Adaptive MIMO Transmission and Detection Technique
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摘要: 无线通信中的多天线(MIMO)技术是提高系统容量的主要方法，在慢衰落信道下可以将接收端获得的信道信息(CSI)反馈到发送端以提高系统的性能。传统的反馈-预编码方案奇异值分解(SVD)法但受空间相关特性和传统VBLAST系统对收、发天线数目要求的影响而限制了它在实际系统中的应用。该文提出一种自适应多天线传输方案，其采用了统一信道参数反馈模型和空时分组编码(STBC)，实现了一种可以用于各种空间相关特性和各种收、发天线数的多天线传输方案可以克服SVD方案的以上缺点。文中仿真也验证了该系统的接收天线可以比发射天线少，并且能够在高相关性信道下工作。
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关键词:
- 自适应MIMO /
- 统一信道分解(UCD) /
- 空时分组编码 /
- 天线分组
Abstract: MIMO is a main capacity improving technique in wireless communication. In slowly fading channel MIMO receiver can feedback the Channel State Information (CSI) to transmitter for the purpose of improving system performance. Traditional feedback-precoding scheme Singular Value Decomposition (SVD) affected by spatial correlation and requirement of traditional VBLAST system about number of transmission and receive antennas, its application is severely restricted. This paper presents an adaptive MIMO transmission system, adopting uniform channel parameter feedback mode and Space-Time Block Code (STBC), this technique can overcome the drawbacks of SVD scheme mentioned above. The simulation results show this kind of system can work with receive antennas less than transmission antennas and perform well under high correlated channel. -
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