MIMO-OFDM系统中联合时域和空间域信号处理的改进PTS算法

发布时间：2018-05-11 08:11

本文选题：部分传输序列 + 循环移位　；参考：《系统工程与电子技术》2014年12期

【摘要】：为了降低多输入多输出正交频分复用(multiple input multiple output orthogonal frequency division multiplexing,MIMO-OFDM)系统中传统部分传输序列(partial transmit sequence,PTS)算法的计算复杂度,提出了联合时域和空间域信号处理的改进PTS算法。在时域信号处理部分,通过信号子块循环移位实现备选序列的增加;在空间域部分,利用天线间信号子块交换实现峰均功率比(peak to average power ratio,PAPR)抑制。同时在接收端,利用子块相位旋转引起的相位差异,本方法通过比较接收信号与星座点的距离,可以实现信号的盲检测,从而有效提高MIMO-OFDM系统的频谱利用率。仿真结果表明,提出的方法能有效地抑制MIMO-OFDM信号的PAPR,而且明显降低了传统PTS算法的计算复杂度,同时可获得跟传统PTS方法已知边带副信息时相似的比特误码率(bit error rate,BER)性能。
[Abstract]:In order to reduce the computational complexity of the traditional partial transmit sequence (PTSs) algorithm for multiple input multiple output orthogonal frequency division multiplexing (MIMO-OFDM) systems, an improved PTS algorithm combining time domain and spatial domain signal processing is proposed. In the time domain signal processing part, the alternative sequences are increased by cyclic shift of the signal subblocks, and in the spatial domain, the peak to average power ratio (peak to average power ratio) suppression is realized by using the signal sub-block exchange between the antennas. At the receiving end, the phase difference caused by sub-block phase rotation is used. By comparing the distance between the received signal and the constellation point, the blind detection of the signal can be realized, and the spectrum efficiency of the MIMO-OFDM system can be improved effectively by comparing the distance between the received signal and the constellation point. The simulation results show that the proposed method can effectively suppress the MIMO-OFDM signal and reduce the computational complexity of the traditional PTS algorithm. At the same time, the bit error rate (bit error bit rate) of the proposed method is similar to that of the traditional PTS method when the sideband side information is known.
【作者单位】：电子科技大学通信抗干扰技术国家重点实验室;
【基金】：国家自然科学基金(61370012) 中央高校基本科研业务费专项资金(ZYGX2012J141)资助课题
【分类号】：TN919.3

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