60GHz通信系统中信道编码及调制技术研究
发布时间：2018-08-16 14:08
【摘要】：60GHz毫米波通信系统是一种短距离超高速传输系统,具有抗干扰能力强,免许可带宽等优点。随着低频段频谱拥挤以及大数据传输的需求逐渐增长,60GHz通信的优势逐渐凸显,人们越来越重视60GHz通信系统的研究。毫米波信号的传播距离较近,在视距(Line of Sight,LOS)信道中信号受到的影响较小,在非视距(Non Line of Sight,NLOS)信道中存在障碍物对信号的吸收作用,使得信号传播受到较大影响。信道编码的检错和纠错能力,可以将信号从信道的影响中恢复出来。60GHz通信系统的信道编码为低密度奇偶校验(Low Density Parity Check,LDPC)码,LDPC码是一类高效纠错码,其校验矩阵具有稀疏特性。在60GHz通信系统中使用LDPC码能满足性能与实现复杂度之间的良好折中。空间调制是近年来提出的一种新型的多输入多输出(Multiple-Input Multiple-Output,MIMO)技术,创新性的通过空间映射传输信息,有效的避免了信道间干扰(Inter-Channel Interference,ICI)和天线同步(Inter-Antenna Synchronization,IAS)等问题。在相同传输速率下,空间调制具有更低的复杂度。因此,在具有较高传输速率的60GHz通信系统中,研究空间调制具有一定的意义。综上所述,本文分别对60GHz通信系统中的信道编码以及空间调制展开如下研究工作:第二章研究了60GHz通信系统中两种LDPC码的编译码算法,并着重研究了其在60GHz通信系统中的性能。其中一种LDPC码来自于IEEE 802.11ad标准,另一种是60GHz项目中所构建的LDPC码。首先,对两种码字的结构进行分析,给出其相应的编译码算法,然后对两种LDPC码在60GHz信道上分别进行仿真并分析比较误码性能。结果表明,在不同信道中,即使信道质量较差,两种LDPC码均能较好的恢复60GHz信号。第三章在研究空间调制信号传统信号检测算法的基础上,把空间调制技术扩展应用到了频率选择性衰落信道上。首先,研究了多径信道中空间调制的系统模型,通过分析空间调制信号在多径信道中的传播过程,构造了天线和信道的联合网格图,然后利用维特比(Viterbi)算法进行路径搜索,对空间调制信号进行信号检测。最后对几种不同的空间调制方案进行了仿真研究。数字仿真结果显示,本文提出的信号检测算法可以有效的检测多径信道中的空间调制信号,并且在传输速率较高的情况下,空间调制的性能优于传统调制。第四章主要研究了基于60GHz通信系统简单信道模型的空间调制技术。首先分析了60GHz信道的传播特性,根据信道特性将60GHz通信系统中两种信道分别等效为简单的单径与多径信道。在两种等效信道中,分别采用传统的信号检测算法以及第三章提出的检测算法进行信号检测。同时研究了空间调制及其相关技术在两种等效信道模型下的性能,并与传统调制进行了性能对比。结果显示,在LOS信道中,信道的相关性导致空间调制的性能并不理想;在NLOS信道中,当数据传输速率较高时,空间调制及其衍生技术相对于传统调制方式具有较好的性能。综上,本文研究了基于60GHz通信系统中的LDPC编码及空间调制技术,并对目前存在的不足提出建议,针对需要改进的地方做了简要讨论。
[Abstract]:60GHz millimeter wave communication system is a kind of short-range and ultra-high-speed transmission system, which has the advantages of strong anti-jamming ability and free bandwidth. With the increasing demand of low-frequency spectrum congestion and large data transmission, the advantages of 60GHz communication are gradually highlighted. People pay more and more attention to the research of 60GHz communication system. Nearer, in the Line of Sight (LOS) channel, the signal is less affected, and in the non-Line of Sight (NLOS) channel, there are obstacles which absorb the signal, so the signal propagation is greatly affected. Channel coding is low density parity check (LDPC) codes. LDPC codes are a class of efficient error correction codes with sparse check matrices. LDPC codes in 60GHz communication systems can meet the tradeoff between performance and complexity. Spatial modulation is a new type of multiple input multiple output (MIMO) codes proposed in recent years. Ultiple-Input Multiple-Output (MIMO) technology, which transmits information innovatively through spatial mapping, effectively avoids the problems of Inter-Channel Interference (ICI) and Inter-Antenna Synchronization (IAS). At the same transmission rate, spatial modulation has lower complexity. In the 60GHz communication system with transmission rate, it is meaningful to study the spatial modulation. In summary, this paper studies the channel coding and spatial modulation in the 60GHz communication system as follows: Chapter 2 studies the coding and decoding algorithms of two LDPC codes in the 60GHz communication system, and focuses on their performance in the 60GHz communication system. One of the LDPC codes comes from IEEE 802.11ad standard and the other is LDPC codes constructed in the 60GHz project. Firstly, the structure of the two codes is analyzed, and the corresponding encoding and decoding algorithms are given. Then the two LDPC codes are simulated on the 60GHz channel and the BER performance is analyzed and compared. The channel quality is poor, and both LDPC codes can recover 60GHz signal well. In the third chapter, the spatial modulation technology is extended to the frequency selective fading channel based on the study of the traditional signal detection algorithm of spatial modulation signal. Firstly, the system model of spatial modulation in multipath channel is studied, and the spatial modulation signal is analyzed. A joint mesh of antenna and channel is constructed in the propagation process of multipath channel, and then a path search algorithm based on Viterbi algorithm is used to detect the spatial modulation signal. Finally, several different spatial modulation schemes are simulated. The digital simulation results show that the proposed algorithm is feasible. In order to effectively detect the spatial modulation signals in multipath channels, and the performance of spatial modulation is better than that of traditional modulation at a higher transmission rate. Chapter 4 mainly studies the spatial modulation technology based on the simple channel model of 60GHz communication system. In the two equivalent channels, the traditional signal detection algorithm and the detection algorithm proposed in Chapter 3 are used for signal detection respectively. The performance of spatial modulation and its related technologies under the two equivalent channel models is studied and compared with the traditional modulation. The results show that the performance of spatial modulation is unsatisfactory in LOS channel because of the correlation of channels. In NLOS channel, the performance of spatial modulation and its derivatives is better than that of traditional modulation when the data transmission rate is high. In summary, this paper studies LDPC coding and spatial modulation in 60GHz communication system. The technology and suggestions for the deficiencies are briefly discussed.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN928
本文编号：2186213
[Abstract]:60GHz millimeter wave communication system is a kind of short-range and ultra-high-speed transmission system, which has the advantages of strong anti-jamming ability and free bandwidth. With the increasing demand of low-frequency spectrum congestion and large data transmission, the advantages of 60GHz communication are gradually highlighted. People pay more and more attention to the research of 60GHz communication system. Nearer, in the Line of Sight (LOS) channel, the signal is less affected, and in the non-Line of Sight (NLOS) channel, there are obstacles which absorb the signal, so the signal propagation is greatly affected. Channel coding is low density parity check (LDPC) codes. LDPC codes are a class of efficient error correction codes with sparse check matrices. LDPC codes in 60GHz communication systems can meet the tradeoff between performance and complexity. Spatial modulation is a new type of multiple input multiple output (MIMO) codes proposed in recent years. Ultiple-Input Multiple-Output (MIMO) technology, which transmits information innovatively through spatial mapping, effectively avoids the problems of Inter-Channel Interference (ICI) and Inter-Antenna Synchronization (IAS). At the same transmission rate, spatial modulation has lower complexity. In the 60GHz communication system with transmission rate, it is meaningful to study the spatial modulation. In summary, this paper studies the channel coding and spatial modulation in the 60GHz communication system as follows: Chapter 2 studies the coding and decoding algorithms of two LDPC codes in the 60GHz communication system, and focuses on their performance in the 60GHz communication system. One of the LDPC codes comes from IEEE 802.11ad standard and the other is LDPC codes constructed in the 60GHz project. Firstly, the structure of the two codes is analyzed, and the corresponding encoding and decoding algorithms are given. Then the two LDPC codes are simulated on the 60GHz channel and the BER performance is analyzed and compared. The channel quality is poor, and both LDPC codes can recover 60GHz signal well. In the third chapter, the spatial modulation technology is extended to the frequency selective fading channel based on the study of the traditional signal detection algorithm of spatial modulation signal. Firstly, the system model of spatial modulation in multipath channel is studied, and the spatial modulation signal is analyzed. A joint mesh of antenna and channel is constructed in the propagation process of multipath channel, and then a path search algorithm based on Viterbi algorithm is used to detect the spatial modulation signal. Finally, several different spatial modulation schemes are simulated. The digital simulation results show that the proposed algorithm is feasible. In order to effectively detect the spatial modulation signals in multipath channels, and the performance of spatial modulation is better than that of traditional modulation at a higher transmission rate. Chapter 4 mainly studies the spatial modulation technology based on the simple channel model of 60GHz communication system. In the two equivalent channels, the traditional signal detection algorithm and the detection algorithm proposed in Chapter 3 are used for signal detection respectively. The performance of spatial modulation and its related technologies under the two equivalent channel models is studied and compared with the traditional modulation. The results show that the performance of spatial modulation is unsatisfactory in LOS channel because of the correlation of channels. In NLOS channel, the performance of spatial modulation and its derivatives is better than that of traditional modulation when the data transmission rate is high. In summary, this paper studies LDPC coding and spatial modulation in 60GHz communication system. The technology and suggestions for the deficiencies are briefly discussed.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN928
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