空时频分组码的设计和GLRT解码算法

Design and GLRT decoding algorithm for space-time-frequency blocking code

基于多输入多输出(MIMO)天线和正交频分多路复用(OFDM),提出了空时频分组编码方法,发射端的编码和接收端的解码都不需要信道状态信息(CSI)。利用广义似然比检验(GLRT)解码算法,导出了成对符号错误概率(PEP)上限和码的设计准则。分析表明,在频率选择性MIMO信道中,这种码能充分利用空间分集和频率分集,而且只有较低的编解码复杂性。仿真结果证实,在频率选择性MIMO信道中,提出的非相干空时频码相对空时分组码性能有很大提高。

A space-time-frequency （STF） blocking code approach is presented based on multiple-input mul tiple-output （MIMO） antennas and orthogonal frequency division multiplexing （OFDM）, in which neither the receiver nor the transmitter needs to know the channel state information （CSI）. The chernoff upper bound of the pairwise error probability （PEP） and the code design criteria are derived by means of the generalized likelihood-ratio test （GLRT） decoding algorithm. Analytic results indicate that, by using the presented code, full spatial diversity and frequency diversity can be obtained on frequency-selective Rayleigh fading channels with low coding and decoding complexity. Simulation results confirm that the presented code improves the performance considerably compared with the space-time blocking code on frequency selective MIMO fading channels.