连续相位调制系统接收机关键技术研究
发布时间：2018-11-25 21:46
【摘要】：连续相位调制(Continuous Phase Modulation,CPM)具有相位连续和恒包络的特性,其频谱较为紧凑,频带利用率高,系统可以使用效率较高且成本较低的非线性功率放大器,大大降低了设备成本和功耗。同时,CPM是一种非线性调制,信号本身引入记忆性,其调制过程可以等效为一个编码器和一个线性调制器的级联,因而可以结合信道编码技术对信号进行迭代检测。在实际无线通信系统中,CPM通过多径衰落信道时,会引入码间干扰(Inter Symbol Interference,ISI)。通常采用低复杂度的频域均衡技术来降低码间串扰对系统的影响。但是对于多径时变信道,一帧数据内离散信道冲击响应是变化的,采用频域均衡的系统性能较差。因此本文主要研究针对时变信道下的CPM信号迭代均衡技术。本文首先阐述了课题的研究背景及意义,分析了连续相位调制和恒包络正交频分复用(Constant Envelope Orthogonal Frequency Division Multiplexing,CE-OFDM)两种恒包络调制的研究现状,并简要概括了本文主要研究内容及结构安排。第二章主要研究了时变信道下基于逐幸存处理(Per-Survivor Processing,PSP)的CPM自适应均衡算法,并且提出了一种适合快时变信道的自适应跟踪算法。本章首先介绍了CPM信号的调制原理,相位状态以及信道模型。然后研究了时变信道下CPM均衡算法,结合CPM信号本身的特性采用自适应逐幸存处理的均衡算法。并且与传统的时域均衡进行了比较。随后仿真得到了时变信道下的逐幸存处理均衡算法与传统时域均衡算法的性能,并且给出两种均衡算法的性能对比。第三章主要研究时变信道下CPM自适应迭代检测(Adaptive Iterative Detection,AID)算法。本章首先根据CPM信号的解调特性,研究CPM信号的自适应逐幸存处理软解调算法。然后根据现有的迭代检测模型,实现连续相位调制的自适应迭代检测。并且研究单径时变信道和多径时变信道环境下的仿真性能。由于随着多径数量的增加使得CPM的软解调复杂度增大,因此本文进一步研究了低复杂度的软解调算法,并给出算法复杂度分析和性能仿真。第四章主要研究CE-OFDM技术在毫米波信道下的解调算法及性能。本章首先介绍CE-OFDM的调制解调原理,并给出CE-OFDM在加性高斯白噪声(Additive White Gaussian Noise,AWGN)下接收端采用不同的参数的解调模块的仿真性能。然后给出多径信道下CE-OFDM的性能分析。最后仿真分析了在802.11ad信道下CE-OFDM的性能。第五章主要总结了本文的主要贡献。并且简述了这两种恒包络调制所面临的问题和困难,给出了进一步的研究建议。
[Abstract]:Continuous phase modulation (Continuous Phase Modulation,CPM) has the characteristics of continuous phase and constant envelope, its frequency spectrum is compact, frequency band efficiency is high, and the system can use high efficiency and low cost nonlinear power amplifier. The equipment cost and power consumption are greatly reduced. At the same time, CPM is a nonlinear modulation, the signal itself introduces memory, its modulation process can be equivalent to a coder and a linear modulator cascade, so it can be combined with channel coding technology to iteratively detect the signal. In the actual wireless communication system, CPM will introduce intersymbol interference (Inter Symbol Interference,ISI) in multipath fading channel. Low complexity frequency domain equalization technique is usually used to reduce the influence of inter-symbol crosstalk on the system. However, for multipath time-varying channels, the impulse response of discrete channel in a frame is variable, and the performance of the system using frequency domain equalization is poor. Therefore, this paper focuses on iterative equalization of CPM signals in time-varying channels. In this paper, the background and significance of the research are described, and the research status of continuous phase modulation and constant envelope orthogonal frequency division multiplexing (Constant Envelope Orthogonal Frequency Division Multiplexing,CE-OFDM) is analyzed. The main contents and structure of this paper are briefly summarized. In chapter 2, the CPM adaptive equalization algorithm based on Per-Survivor Processing,PSP is studied, and an adaptive tracking algorithm for fast time-varying channel is proposed. In this chapter, the modulation principle, phase state and channel model of CPM signal are introduced. Then, the CPM equalization algorithm in time-varying channel is studied, and the adaptive one by one survival equalization algorithm is adopted in combination with the characteristics of CPM signal itself. And compared with the traditional time domain equalization. Then the simulation results show that the performance of the successive equalization algorithm in time-varying channel is compared with that of the traditional time-domain equalization algorithm, and the performance of the two equalization algorithms is compared. In chapter 3, CPM adaptive iterative detection (Adaptive Iterative Detection,AID) algorithm in time-varying channel is studied. In this chapter, according to the demodulation characteristics of CPM signal, we study the adaptive one-survivor soft demodulation algorithm of CPM signal. Then adaptive iterative detection of continuous phase modulation is realized according to the existing iterative detection model. The simulation performance of single-path time-varying channel and multi-path time-varying channel is studied. Because the complexity of soft demodulation of CPM increases with the increase of the number of multipath, this paper further studies the low-complexity soft demodulation algorithm, and gives the complexity analysis and performance simulation of the algorithm. In chapter 4, the demodulation algorithm and performance of CE-OFDM in millimeter-wave channel are studied. In this chapter, the principle of modulation and demodulation of CE-OFDM is introduced, and the simulation performance of demodulation module with different parameters at the receiver of CE-OFDM under additive Gao Si white noise (Additive White Gaussian Noise,AWGN is given. Then the performance analysis of CE-OFDM in multipath channel is given. Finally, the performance of CE-OFDM in 802.11ad channel is simulated and analyzed. The fifth chapter summarizes the main contributions of this paper. The problems and difficulties faced by these two kinds of constant envelope modulation are briefly described, and further research suggestions are given.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN851
[Abstract]:Continuous phase modulation (Continuous Phase Modulation,CPM) has the characteristics of continuous phase and constant envelope, its frequency spectrum is compact, frequency band efficiency is high, and the system can use high efficiency and low cost nonlinear power amplifier. The equipment cost and power consumption are greatly reduced. At the same time, CPM is a nonlinear modulation, the signal itself introduces memory, its modulation process can be equivalent to a coder and a linear modulator cascade, so it can be combined with channel coding technology to iteratively detect the signal. In the actual wireless communication system, CPM will introduce intersymbol interference (Inter Symbol Interference,ISI) in multipath fading channel. Low complexity frequency domain equalization technique is usually used to reduce the influence of inter-symbol crosstalk on the system. However, for multipath time-varying channels, the impulse response of discrete channel in a frame is variable, and the performance of the system using frequency domain equalization is poor. Therefore, this paper focuses on iterative equalization of CPM signals in time-varying channels. In this paper, the background and significance of the research are described, and the research status of continuous phase modulation and constant envelope orthogonal frequency division multiplexing (Constant Envelope Orthogonal Frequency Division Multiplexing,CE-OFDM) is analyzed. The main contents and structure of this paper are briefly summarized. In chapter 2, the CPM adaptive equalization algorithm based on Per-Survivor Processing,PSP is studied, and an adaptive tracking algorithm for fast time-varying channel is proposed. In this chapter, the modulation principle, phase state and channel model of CPM signal are introduced. Then, the CPM equalization algorithm in time-varying channel is studied, and the adaptive one by one survival equalization algorithm is adopted in combination with the characteristics of CPM signal itself. And compared with the traditional time domain equalization. Then the simulation results show that the performance of the successive equalization algorithm in time-varying channel is compared with that of the traditional time-domain equalization algorithm, and the performance of the two equalization algorithms is compared. In chapter 3, CPM adaptive iterative detection (Adaptive Iterative Detection,AID) algorithm in time-varying channel is studied. In this chapter, according to the demodulation characteristics of CPM signal, we study the adaptive one-survivor soft demodulation algorithm of CPM signal. Then adaptive iterative detection of continuous phase modulation is realized according to the existing iterative detection model. The simulation performance of single-path time-varying channel and multi-path time-varying channel is studied. Because the complexity of soft demodulation of CPM increases with the increase of the number of multipath, this paper further studies the low-complexity soft demodulation algorithm, and gives the complexity analysis and performance simulation of the algorithm. In chapter 4, the demodulation algorithm and performance of CE-OFDM in millimeter-wave channel are studied. In this chapter, the principle of modulation and demodulation of CE-OFDM is introduced, and the simulation performance of demodulation module with different parameters at the receiver of CE-OFDM under additive Gao Si white noise (Additive White Gaussian Noise,AWGN is given. Then the performance analysis of CE-OFDM in multipath channel is given. Finally, the performance of CE-OFDM in 802.11ad channel is simulated and analyzed. The fifth chapter summarizes the main contributions of this paper. The problems and difficulties faced by these two kinds of constant envelope modulation are briefly described, and further research suggestions are given.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN851
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