【Key words】 space-time diversity； BER； power constraint； space-time coding； precoding；
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space-time diversity 空时分集
space time transmit diversity 空时发射分集 ; 空时分集
Space -time coding can increase channel capacity by using the space and time diversity technique.
空时编码技术通过空间和时间分集接收能有效增加信道容量。
In this paper, we mainly compare the performance of the two space-time codes in many aspects, such as design criterion, transmission rate, diversity gain, code gain and arithmetic complexity etc.
在本文中，本文对这两种编码方式在设计准则、传输速率、分集增益、编码增益和算法复杂性等方面进行了较为详尽的比较研究。
Performance comparison of space time trellis codes and space time transmit diversity is carried out under the same bandwidth efficiency in this paper.
本文在相同频带利用率下将空时格码与空时发射分集的性能进行了比较。
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