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为了降低8×8的半正交代数空时(SAST)编码的译码复杂度,提出了一种新的适用于正交振幅调制(QAM)的8×8 SAST编码的编译码方法.该方法在发送端根据反馈信息将部分发送信号旋转适当的角度,实现了前半部分发送信号向量及后半部分发送信号向量的实部分量和虚部分量在传输过程中保持正交,从而其译码复杂度与调制阶数的平方成正比.仿真结果显示,该编码仅需反馈5 bit就极大地降低了译码复杂度.
In order to reduce the decoding complexity of semi-orthogonal algebra space-time (SAST) coding of 8 × 8, a new 8 × 8 SAST coding coding and decoding method suitable for quadrature amplitude modulation (QAM) is proposed. At the transmitting end, according to the feedback information, the part of the transmitted signal is rotated by a suitable angle to realize that the real part and the imaginary part of the transmitted signal vector in the first half and the transmitted signal vector in the second half are orthogonal during transmission, so that the decoding is complex The degree is proportional to the square of the modulation order, and the simulation results show that the coding only needs to feed back 5 bits, which greatly reduces the decoding complexity.