在调制信号前采用数据预编码，对接收信号进行相应译码，以消除信道中噪声引起的差错传播。
Error propagation caused by noise can be avoided by precoding the data at the transmitter prior to modulation and decoding operation of received signals.
但由于空时分组码受正交条件限制，传输效率得不到提高，而BLAST系统存在差错传播制约着误码率的下降。
But the data efficiency of STBC is restricted to orthogonal transmission and the bit error rate of BLAST is high due to the error propagation.
同步标记可限制空域差错在视频帧之间传播。
Synchronization markers limit the propagation of spatial errors within video frames.
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