基于差分码的空间调制的研究
发布时间：2019-05-18 08:54
【摘要】：随着移动通信技术的蓬勃发展,人们越来越需要超高速的传输速率,超大的容量、超可靠性、随时随地的接入。面对日益增长的需求,通信资源却十分紧缺,这进一步需要引入新的无线传输技术。空间调制(Spatial Modulation,SM)作为多输入多输出(Multiple Input Multiple Output,MIMO)传输技术中的一个新型传输概念,很有可能作为第五代移动通信系统的无线传输技术。空间调制是近年来提出的一种多天线空间复用技术,发送端单天线工作的结构,避免了信道间干扰(Inter Channel Interference,ICI)和天线间同步(Inter Antenna Synchronization,IAS)的问题。SM系统中将输入信息比特分为两部分分别映射到空间天线星座图和信号星座图上,在不增加系统带宽和发射功率的前提下有效提高空间调制系统的频带利用率,克服了传统MIMO系统的缺陷。因此,空间调制的思想一经提出就引起了国内外学者的广泛关注。本文基于差分编码的思想,在空间调制系统中提出了一种新的差分方案,即差分空间调制(Differential Spatial Modulation,DSM)。差分空间调制系统中,发送端结合差分的思想选择天线传输调制信息,接收端依据差分的特点,提出了一种新的解调方法,差分直接检测法,该解调算法不同于已有的解调算法,根据前后相邻两时刻接收信号向量的差的模值的差别进行解调。差分空间调制可在信道状态信息未知时完成解调,这点也是DSM系统的最大优点。基于空间调制技术的研究背景和国内外发展现状,论文简单介绍了SM基本原理和系统模型,深入研究分析了DSM实现方案。首先,对发送端两根天线时的差分空间调制方案进行了具体阐述,包括发送端天线编码方式,不同调制方式下接收端的具体解调步骤。从理论上推导分析了DSM的可行性,并进行了性能仿真,做出了性能曲线。其次,对发送端四根天线的情况分别给出了两种实施方案,通过matlab仿真验证了本文提出方法的可行性。结果表明DSM可在信道参数未知时实现解调,具有较好的抗信道参数变化的性能。
[Abstract]:With the rapid development of mobile communication technology, people need ultra-high speed transmission rate, super large capacity, super reliability, anytime and anywhere access. In the face of increasing demand, communication resources are very scarce, which further requires the introduction of new wireless transmission technology. Spatial modulation (Spatial Modulation,SM), as a new transmission concept in multi-input multi-output (Multiple Input Multiple Output,MIMO) transmission technology, is likely to be used as the wireless transmission technology of the fifth generation mobile communication system. Spatial modulation is a multi-antenna spatial reuse technology proposed in recent years. The structure of single antenna at the transmitter avoids inter-channel interference (Inter Channel Interference,ICI) and synchronous (Inter Antenna Synchronization, between antennas. In SM system, the input information bits are mapped to the space antenna constellation diagram and the signal constellation diagram respectively, which can effectively improve the frequency band utilization of the space modulation system without increasing the system bandwidth and transmission power. The defects of traditional MIMO system are overcome. Therefore, as soon as the idea of spatial modulation is put forward, it has attracted extensive attention of scholars at home and abroad. In this paper, based on the idea of differential coding, a new difference scheme, differential spatial modulation (Differential Spatial Modulation,DSM), is proposed in spatial modulation system. In the differential space modulation system, the transmitter selects the idea of difference to transmit the modulation information. According to the characteristics of the difference, the receiver proposes a new demodulation method, the differential direct detection method. The demodulation algorithm is different from the existing demodulation algorithm, according to the difference of the received signal vector between the two adjacent times. Differential space modulation can Demodulate when the channel state information is unknown, which is also the biggest advantage of DSM system. Based on the research background of spatial modulation technology and the development status at home and abroad, this paper briefly introduces the basic principle and system model of SM, and deeply studies and analyzes the implementation scheme of DSM. Firstly, the differential spatial modulation scheme of two antennas at the transmitter is described in detail, including the coding mode of the transmitter antenna and the demodulation steps of the receiver under different modulation modes. The feasibility of DSM is deduced and analyzed theoretically, and the performance simulation is carried out, and the performance curve is made. Secondly, two implementation schemes are given for the four antennas at the transmitter, and the feasibility of the proposed method is verified by matlab simulation. The results show that DSM can realize demodulation when the channel parameters are unknown and has good performance against channel parameter variation.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN911.3
本文编号：2479863
[Abstract]:With the rapid development of mobile communication technology, people need ultra-high speed transmission rate, super large capacity, super reliability, anytime and anywhere access. In the face of increasing demand, communication resources are very scarce, which further requires the introduction of new wireless transmission technology. Spatial modulation (Spatial Modulation,SM), as a new transmission concept in multi-input multi-output (Multiple Input Multiple Output,MIMO) transmission technology, is likely to be used as the wireless transmission technology of the fifth generation mobile communication system. Spatial modulation is a multi-antenna spatial reuse technology proposed in recent years. The structure of single antenna at the transmitter avoids inter-channel interference (Inter Channel Interference,ICI) and synchronous (Inter Antenna Synchronization, between antennas. In SM system, the input information bits are mapped to the space antenna constellation diagram and the signal constellation diagram respectively, which can effectively improve the frequency band utilization of the space modulation system without increasing the system bandwidth and transmission power. The defects of traditional MIMO system are overcome. Therefore, as soon as the idea of spatial modulation is put forward, it has attracted extensive attention of scholars at home and abroad. In this paper, based on the idea of differential coding, a new difference scheme, differential spatial modulation (Differential Spatial Modulation,DSM), is proposed in spatial modulation system. In the differential space modulation system, the transmitter selects the idea of difference to transmit the modulation information. According to the characteristics of the difference, the receiver proposes a new demodulation method, the differential direct detection method. The demodulation algorithm is different from the existing demodulation algorithm, according to the difference of the received signal vector between the two adjacent times. Differential space modulation can Demodulate when the channel state information is unknown, which is also the biggest advantage of DSM system. Based on the research background of spatial modulation technology and the development status at home and abroad, this paper briefly introduces the basic principle and system model of SM, and deeply studies and analyzes the implementation scheme of DSM. Firstly, the differential spatial modulation scheme of two antennas at the transmitter is described in detail, including the coding mode of the transmitter antenna and the demodulation steps of the receiver under different modulation modes. The feasibility of DSM is deduced and analyzed theoretically, and the performance simulation is carried out, and the performance curve is made. Secondly, two implementation schemes are given for the four antennas at the transmitter, and the feasibility of the proposed method is verified by matlab simulation. The results show that DSM can realize demodulation when the channel parameters are unknown and has good performance against channel parameter variation.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN911.3
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