Code transmission happens only once, whereas data must be transmitted every time you encounter a validation problem at the other end.
代码传输只会发生一次，但每次在另外一端遇到验证问题时都要传输数据。
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。
Space-time code indicates a new idea of providing high transmission rate in wireless communication systems and has recently received considerable attention.
空时码的提出为解决无线通信系统中的传输速率问题提供了一条新思路，目前已经成为通信研究的一个热点。
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