基于PNC的部分响应CPM信号非相干检测研究

发布时间：2018-04-03 07:16

本文选题：物理层网络编码　切入点：连续相位调制　出处：《南京航空航天大学》2017年硕士论文

【摘要】：近几年,将网络编码技术应用到物理层所形成的物理层网络编码(Physical-Layer Network Coding)逐渐变为研究的热点。物理层网络编码利用电磁波信号叠加原理,有效地解决了无线通信网络中信号相互影响的问题,作为一种新颖的中继传输技术,在吞吐量方面具有巨大优势。物理层网络编码中的信号调制方式选择连续相位调制(Continuous Phase Modulation),它作为一种常见的非线性调制,相比于线性调制,具有频谱效率高的优点。现有关于CPM-PNC的检测算法均采用全响应连续相位调制(Full Response CPM)信号。基于PNC上PR-CPM的检测,由于部分响应连续相位调制(Partial Response CPM)相比FR-CPM有着频谱利用率更高的优点而引起了人们的关注。本文首先针对单信道点对点系统,分别研究了基于FR-CPM和PR-CPM信号的非相干多符号检测算法,并给出两种信号的仿真结果和分析。针对点对点系统中存在吞吐量低,节点间信息传递耗时较大的不足,提出了PNC系统中的FR-CPM非相干多符号检测算法。但是FR-CPM并不是最佳的绿色调制方式,PR-CPM相比于FR-CPM,有着频谱效率和功率效率更高的优势。同时基于Laurent分解的原理,将PR-CPM信号用信号波形线性叠加的方式表示,可降低接收机的匹配滤波器个数。因此,又提出了一种基于Laurent分解的PR-CPM-PNC多符号非相干检测算法。值得注意的是,当成型脉冲函数为矩形时,发现该算法在检测过程中存在一种相位模糊的现象。针对PR-CPM-PNC非相干多符号检测算法存在检测速率偏低的问题,又提出了PR-CPM-PNC传统块检测算法。但是该算法在提高了检测速率的同时,会使检测性能比非相干多符号检测算法性能降低许多。因此,又提出了一种基于PR-CPM-PNC的非相干块检测优化算法。该算法不仅有效地改善了传统块检测算法的检测性能,而且相比于多符号检测算法,接收机的检测速率有了较大地提升。
[Abstract]:In recent years, the application of network coding technology to physical layer network coding has gradually become a hot topic in the field of physical layer network coding (Physical-Layer Network coding).Physical layer network coding effectively solves the problem of signal interaction in wireless communication networks by using the principle of electromagnetic signal superposition. As a novel relay transmission technology, it has a great advantage in throughput.Continuous Phase modulation is chosen as a signal modulation mode in physical layer network coding. As a common nonlinear modulation, it has higher spectral efficiency than linear modulation.All the existing detection algorithms for CPM-PNC adopt full full phase modulation (CCPM) signals.Based on the detection of PR-CPM on PNC, partial phase modulation (CPM) with partial response phase modulation (CPM) has attracted much attention because of its higher spectral efficiency than that of FR-CPM.In this paper, the incoherent multi-symbol detection algorithms based on FR-CPM and PR-CPM signals are studied for single-channel point-to-point systems, and the simulation results and analysis of the two signals are given.Aiming at the shortcomings of low throughput and time-consuming information transfer between nodes in point-to-point systems, a FR-CPM incoherent multi-symbol detection algorithm in PNC systems is proposed.However, FR-CPM is not the best green modulation method. Compared with FR-CPM, PR-CPM has higher spectral efficiency and higher power efficiency.At the same time, based on the principle of Laurent decomposition, the signal of PR-CPM is expressed by linear superposition of signal waveforms, which can reduce the number of matched filters in the receiver.Therefore, a PR-CPM-PNC multi-symbol incoherent detection algorithm based on Laurent decomposition is proposed.It is worth noting that when the shaping pulse function is rectangular, it is found that there is a phenomenon of phase ambiguity in the detection process of the algorithm.Aiming at the problem of low detection rate in PR-CPM-PNC incoherent multi-symbol detection algorithm, a traditional block detection algorithm for PR-CPM-PNC is proposed.However, the performance of the proposed algorithm is much lower than that of the non-coherent multi-symbol detection algorithm.Therefore, an optimization algorithm for incoherent block detection based on PR-CPM-PNC is proposed.This algorithm not only improves the detection performance of the traditional block detection algorithm, but also improves the detection rate of the receiver compared with the multi-symbol detection algorithm.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN911.3

【参考文献】