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4根发射天线的MIMO-OFDM系统中速率为2的全分集的空时频编码设计

麻清华, 杨绿溪 , 何振亚   

  1. 东南大学 信息科学与工程学院，江苏 南京 210096
  • 收稿日期:2006-12-15 修回日期:2007-06-25 出版日期:2007-11-30 发布日期:2007-11-30

A Rate-Two Full Diversity Space-Time-Frequency Block Code (STFBC) for 4-Tx MIMO-OFDM Systems

MA Qing-hua ，YANG Lu-xi ，HE Zhen-ya   

  1. School of Information Science and Engineering, Southeast University, Nanjing 210096，China
  • Received:2006-12-15 Revised:2007-06-25 Online:2007-11-30 Published:2007-11-30

摘要： 为了利用频率选择性准静态块衰落的MIMO-OFDM系统中的完全分集度，利用代数空时码和Hadamard变换，给出一种空时频分组码，分集度为发射天线数 与接收天线数 和准静态块衰落抽头数 的乘积。当发射天线数为4时，这种空时频码能达到符号传输速率能达到2。针对4根发射天线的系统，本文所提出的STFC与其他STFC方案相比，可以在符号传输速率为1的STFC与符号传输速率为4的STFC之间达到一个很好的性能和复杂度的折中。实验仿真结果验证了该结论。

关键词: 空时频分组编码, 分集, 正交频分复用, 频率选择性衰落

Abstract: To get full diversity available in the MIMO-OFDM systems with frequency selective quasi-static block fading, the algebraic space-time coding and Hadamard transform are utilized to get a new space-time-frequency block coding (STFBC) to get full diversity. The full diversity is a product of the number of the transmit antenna Mt, receiver antenna Mr and channel taps L in a quasi-static block fading channel. When there are 4 transmitting antennas, the proposed STFBC can reach symbol transmission rate of two. Compared with other STFCs, it makes a good tradeoff between rate-one STFC and rate-four STFC in 4-transmitter MIMO-OFDM systems. Simulation results show validity of our technique.

Key words: space time frequency block coding(STFBC ), diversity, orthogonal frequency division multiplexing, frequency-selective fading