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直扩MSK信号全数字解扩接收机研究

发布时间:2018-04-11 20:11

  本文选题:直扩MSK + 捕获 ; 参考:《南京理工大学》2017年硕士论文


【摘要】:扩频通信技术具有低截获性、多用户随机选址能力、抗干扰性能强等特点;最小频移键控(Minimum Shift Keying,MSK)信号具有对非线性失真不敏感、旁瓣衰减快、频谱利用率高、包络恒定等优点。直扩MSK通信系统兼具直接序列扩频技术与MSK调制技术的优势,在很多军用和民用领域得到广泛应用。本文针对直扩MSK信号全数字解扩接收机及其算法展开研究。本文采用并行和串行两种方法来实现直扩MSK信号的产生。在串行产生方法中,提出一种基于凸优化的转换滤波器设计方法,实现将直扩BPSK信号转换成直扩MSK信号的过程。在码捕获的过程中,针对多普勒频偏会影响码捕获相关峰这一问题,提出基于延迟相关的码捕获算法,以消除多普勒频偏对相关峰的影响。鉴于延迟相关算法不能同时捕获伪码相差和多普勒频偏,提出一种基于多普勒补偿的伪码-多普勒联合捕获算法,提高多普勒频偏估计范围,但该算法的估计精度和估计范围受到运算复杂度的限制。为了找到一种兼顾估计精度、估计范围和运算复杂度的捕获算法,本文首次将压缩感知理论引入码捕获中,提出一种基于压缩感知的联合捕获算法,仿真表明这种算法不仅能够同时捕获伪码相差和多普勒频偏,还能进一步提高多普勒估计精度和范围,同时降低运算复杂度。在直扩MSK信号的跟踪部分,分别采用全数字超前-滞后延迟锁相环和Costas环进行扩频码和载波相位跟踪,并通过仿真确定最优环路参数。最后将本文设计的直扩MSK信号解扩接收机与常规解扩解调方法的误码性能进行比较,得出本文设计的接收机能够避免信噪比损失,更适合低信噪比工作环境的结论。
[Abstract]:The spread spectrum communication technology has the characteristics of low interception, multi-user random location ability, strong anti-jamming performance and so on. The minimum frequency shift keying minimum Shift key MSKS signal has the advantages of being insensitive to nonlinear distortion, fast sidelobe attenuation, high spectral efficiency and constant envelope.Direct sequence spread spectrum (DSS) and MSK modulation (DSS) are the advantages of DSSS communication system, and have been widely used in many military and civil fields.In this paper, the full digital despreading receiver and its algorithm for direct spread sequence (MSK) signal are studied.In this paper, parallel and serial methods are used to realize the generation of DS MSK signals.In the serial generation method, a transform filter design method based on convex optimization is proposed to realize the process of converting the DSSS BPSK signal into the DSSS MSK signal.In the process of code acquisition, a code acquisition algorithm based on delay correlation is proposed to eliminate the influence of Doppler frequency offset on the correlation peak.In view of the delay correlation algorithm can not simultaneously capture pseudo-code phase and Doppler frequency offset, a pseudo-code-Doppler joint acquisition algorithm based on Doppler compensation is proposed to improve the range of Doppler frequency offset estimation.However, the estimation accuracy and estimation range of the algorithm are limited by the computational complexity.In order to find a capture algorithm which takes into account the estimation accuracy, the estimation range and the computational complexity, this paper first introduces the theory of compressed sensing into code acquisition, and proposes a joint acquisition algorithm based on compressed sensing.Simulation results show that the proposed algorithm can not only capture the pseudo-code phase difference and Doppler frequency offset simultaneously, but also improve the accuracy and range of Doppler estimation and reduce the computational complexity.In the tracking part of DSSS MSK signal, the spread spectrum code and carrier phase tracking are carried out by using digital lead-lag delay phase-locked loop and Costas loop respectively, and the optimal loop parameters are determined by simulation.Finally, the performance of the DSS MSK signal despreading receiver designed in this paper is compared with that of the conventional despreading demodulation method, and the conclusion is drawn that the receiver designed in this paper can avoid the loss of SNR and is more suitable for the working environment of low SNR.
【学位授予单位】:南京理工大学
【学位级别】:硕士
【学位授予年份】:2017
【分类号】:TN914.42

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