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中文摘要：
针对Beyond 3G MIMO系统下行链路中发射天线数大于接收天线数的特点，通过构造码字结构，根据编码增益的表达式，得到具有高编码增益的参数，提出了一种适合于4根发射天线、具有低解码复杂度的全分集全码率空时编码方法．该方法具有编码增益高、误码性能好和解码复杂度低等优点．仿真结果表明，与传统的空时编码方案，如酉空时码、空时分组编码和全分集全码率空时编码方法相比，新编码方法具有很好的误码性能，同时具有很低的解码复杂度．
英文摘要：
A full diversity and full rate space time coding scheme for four transmit antennas with low decoding complexity was proposed for the downlink of the Beyond 3G MIMO system, where there are more transmit antennas than receive antennas. The code structure is constructed, then according to the expression of the coding gain, the parameters with high coding gain are obtained. The theoretic analysis shows that the proposed scheme has many advantages such as high coding gain, low bit error probability and reduced computational cost. Moreover, the simulation results testify that the new coding scheme can significantly improve the performance of MIMO system with low decoding complexity, compared with the traditional space time coding schemes such as unitary space time code, space time block code and the original full diversity and full rate space time code.
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