MIMO信道中差分空间调制快速解码算法的研究

发布时间：2018-04-10 07:51

本文选题：差分调制　切入点：搜索复杂度　出处：《广州大学》2016年硕士论文

【摘要】：空间调制(SM)是一种新兴的多输入多输出技术,它在任何时间内只激活一个单一的传输天线,并使用有索引的有源天线作为一个额外附加的信息传递机制。然而,对于它的性质,SM解码是连贯的信道状态,并且接收机在该信道状态信息中是必需的。事实上,由于大量考虑到信道估计和符号检测,连贯标准的SM解码可能是非常复杂的。在这种对应关系,能完全绕过任何一个CSI发射机或接收机的SM的微分方案就被提出来了,同时能保留单个活动发射天线的特性。该方案可适用于任何恒定能量的星座如相移键控和系统的发射和接收任意数的天线。仿真结果提出了在各种系统构型下,在具有相同的频谱效率下,相比于连贯的SM调制该方案是能够承受不超过3dB的信噪比损失并且优于单天线差分相移键控和差分空时编码方案。差分空间调制是一种适合于空间调制技术而最新出现的差分调制方案,它仅在一组天线中选择一个用于在任何时间中进行传输。然而,当发射的天线数量很多时,在差分空间调制过程中它会导致抑制搜索的复杂性,在这篇论文中,针对DSM调制我们提出了一种低复杂度次最优的调制器。它是基于最大似然准则设计的标准,但需要更多的天线激活顺序的可能性。检测采用两步进行：第一步是利用对称性来限制一些小部分的信号星座的调制符号；第二步是选择最有可能的调制符号从输出的第一步再根据通过一个维特比算法确定天线的激活顺序。分析和仿真结果表明该检测器达到接近最优的性能,并且在很大程度上减少了搜索复杂性。
[Abstract]:Spatial Modulation (SM) is a new multi-input and multi-output technique, which activates only one single transmission antenna at any time and uses an indexed active antenna as an additional information transfer mechanism.However, SM decoding is a coherent channel state for its nature, and the receiver is required in the channel state information.In fact, because channel estimation and symbol detection are widely considered, SM decoding of coherent standards can be very complicated.In this correspondence, the differential scheme of SM, which can completely bypass any CSI transmitter or receiver, is proposed, and the characteristics of a single active transmit antenna can be preserved at the same time.This scheme can be applied to any constellation with constant energy such as phase shift keying and any number of antennas transmitted and received by the system.The simulation results show that under various system configurations and with the same spectral efficiency,Compared with the coherent SM modulation scheme, the proposed scheme can withstand SNR loss not exceeding 3dB and is superior to single antenna differential phase-shift keying and differential space-time coding.Differential space modulation (DSM) is a new differential modulation scheme suitable for spatial modulation technology. It only selects one of the antennas for transmission at any time.However, when the number of transmit antennas is large, it will lead to the complexity of suppression search in the differential space modulation process. In this paper, we propose a low-complexity sub-optimal modulator for DSM modulation.It is a standard based on the maximum likelihood criterion, but requires more possibilities of antenna activation order.The detection is carried out in two steps: the first step is to use symmetry to limit the modulation symbols of some small signal constellations;The second step is to select the most likely modulation symbol from the first step of the output and then determine the sequence of antenna activation according to a Viterbi algorithm.The results of analysis and simulation show that the performance of the detector is close to the optimal one, and the complexity of the search is reduced to a great extent.
【学位授予单位】：广州大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN919.3

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