基于OB-MMSE的空间调制系统检测算法研究

发布时间：2018-02-11 08:17

  本文关键词： 多输入多输出 空间调制 信号检测 检测性能 最大似然 格约减　出处：《南京信息工程大学》2016年硕士论文　论文类型：学位论文

【摘要】：为了满足未来移动发展需求,无线通信系统一直在追求更高的数据传输速率,研究的关键挑战是找到具有潜力的多天线传输技术。针对现有多输入多输出系统(MIMO)发射天线间的同步与信道间干扰等问题,提出了空间调制技术(SM)。为了实现更优的多天线传输,本文对空间调制技术进行了较为深入地研究,主要工作如下：第一,详细分析了空间调制传统的检测算法,包括最大似然检测以及分块排序最小均方误差(OB-MMSE)检测算法。现有的最大似然检测算法,由于其计算复杂度极高,严重限制了其在实际中的应用,而计算复杂度较低的分块排序最小均方误差(OB-MMSE)算法在高维发射天线检测性能较差。针对上面算法的不足,本文在OB-MMSE算法的基础上提出了两种新的算法。一种是空间调制系统格约减辅助检测算法(LR-OB-MMSE),该算法解决了OB-MMSE算法在高维度发射天线情况下性能较差和传统最大似然检测算法复杂度高的问题。另一种是在OB-MMSE基础上的一种高效计算集中最大似然检测算法,即CECML-OB-MMSE算法。该算法避免了冗余计算,使计算提前终止,降低了计算复杂度,而且检测性能没有明显下降。以上两种改进方案都是运用不同算法进行了联合检测,能在复杂度和检测性能之间取得良好折中。第二,对改进的算法进行仿真研究。首先,对SM系统收发天线数目、检测算法,及调制方式等参数不同的条件下进行仿真,通过误比特率和浮点数曲线分析其性能和计算复杂度。其次,在性能和复杂度方面对改进的方案与传统检测算法进行对比分析。通过仿真验证本文提出的新的算法合理性与可靠性：LR-OB-MMSE算法在高维发射天线情况下有效地降低了误码率,其检测性能优于OB-MMSE算法并且趋于最大似然检测,同时具有较低的复杂度；CECML算法在较高信噪比情况下性能没有明显变化,但其复杂度降低了超过50%。
[Abstract]:In order to meet the needs of future mobile development, wireless communication systems have been pursuing higher data transmission rates. The key challenge of the research is to find the potential multi-antenna transmission technology. Aiming at the problems of synchronization and inter-channel interference between the transmitting antennas of the existing multiple-input and multi-output systems, a spatial modulation technique is proposed to achieve better multi-antenna transmission. The main work of this paper is as follows: first, the traditional detection algorithm of spatial modulation is analyzed in detail. It includes maximum likelihood detection and block sorting minimum mean square error (OB-MMSE) detection algorithm. Due to its high computational complexity, the existing maximum likelihood detection algorithm severely limits its application in practice. However, the OB-MMSE algorithm, which has low computational complexity, has a poor performance in the detection of high-dimensional transmit antennas. This paper proposes two new algorithms based on the OB-MMSE algorithm. One is the LR-OB-MMSE algorithm, which solves the problem of poor performance of the OB-MMSE algorithm and the traditional maximum likelihood algorithm in the case of high-dimensional transmit antennas. The other is an efficient algorithm based on OB-MMSE. That is, CECML-OB-MMSE algorithm, which avoids redundant computation, reduces computational complexity, reduces computational complexity, and does not significantly reduce detection performance. Both of the above two improved schemes use different algorithms to perform joint detection. It can achieve a good compromise between complexity and detection performance. Secondly, the improved algorithm is simulated. First, the number of antenna, detection algorithm, modulation and other parameters of SM system are simulated. The performance and computational complexity are analyzed by bit error rate and floating-point curve. Secondly, The performance and complexity of the improved algorithm and the traditional detection algorithm are compared and analyzed. The simulation results show that the proposed new algorithm is reasonable and reliable, which can effectively reduce the bit error rate (BER) in the case of high-dimensional transmitting antenna. Its detection performance is superior to that of OB-MMSE algorithm and tends to maximum likelihood detection. At the same time, the performance of OB-MMSE algorithm with lower complexity does not change obviously in the case of higher SNR, but its complexity is reduced by more than 50%.
【学位授予单位】：南京信息工程大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN929.5;TN919.3
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本文编号：1502597