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中文摘要：
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肘．与接收天线数肘，和准静态块衰落抽头数三的乘积．当发射天线数为4时，这种空时频码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折中．实验仿真结果验证了该结论．
英文摘要：
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 M,, 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.
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