基于多输入多输出(MIMO)的空时编码技术可以充分利用无线通信信道中的多径,从而降低误码率、提高系统的可靠性.文中在空时编码技术的基础上,基于正交频分复用(OFDM)系统提出了一种空、时、频分组码的编码改进方案.经仿真证明:这种编码方案在误码率为10-2时,编码后的系统相对于空时分组编码( STBC-OFDM)系统所需信噪比约下降3 dB,提高了系统的可靠性.%The space-time coding technology based on the multiple-input multiple-output (MIMO) can make full use of the multipath of the wireless communication channel to lower her and improve system reliability. On the basis of the space - time coding technology and the orthogonal frequency division multiplexing (OFDM) ,the paper presents an improved coding scheme. Its simulation result shows that, with the ber of 10-2,compared with the signal-to-nosie ratio required by STBC-OFDM (space-time block code) system,the signal-to-noise ratio required by the improved coding system falls by 3 dB,indicating that the system reliability is improved.
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