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1、.摘 要由于具有较高的信息传输效率、较低的截获概率，因此，并行组合扩频系统具有较强的猝发通信和保密通信的能力。时域的猝发能力和频域的低功率谱密度特性使得并行组合扩频通信在军事通信领域具有广泛的应用前景；同时，由于其信息载荷能力极强，对信道环境要求较高的特点，并行组合扩频通信适于在商用光纤骨干网中进行高速数据传输。本文以并行组合扩频通信系统为研究对象，以伪随机序列选取技术、数字调制技术和信道估计技术为研究内容，重点对以下问题进行了研究。首先，结合并行组合扩频通信系统的数学模型，推导了伪随机序列相关特性与并行组合扩频通信系统影响的数学表达式。分析了 m_W 序列相关特性的技术特点和实际应用的局限性
2、；提出了应用完备互补序列作为并行组合扩频通信系统的伪随机序列，通过理论分析和软件仿真论证其可行性。其次，针对不同的信道环境，设计了两种并行组合扩频系统全数字化调制方案，即适用于固定式光纤信道的全数字化 MASK 调制方案、适用于无线衰落信道的全数字化 MSK 调制方案。最后，以提高并行组合扩频通信系统无线信道环境适应能力为目标，开展了信道估计技术的研究；提出了基于连续导频的信道估计方案，并进行了软件仿真验证。关键词：并行组合扩频；信道估计；调制模式；序列相关性.ABSTRACTBecause of the high intelligence transmission efficiency, t
3、he low acquisition probability, therefore, the parallel combination wide frequency system has the strong burst correspondence and privacy communication ability. Time domain burst ability and the frequency range low power spectral density characteristic enables the parallel combination wide frequency
4、 correspondence to have the widespread application prospect in the military correspondence domain; At the same time, because its information loading capacity is greatly strengthened, to the channel environment request high characteristic, the parallel combination wide frequency correspondence is sui
5、table for in the commercial optical fiber backbone network to carry on the high speed data transmission. This article take the parallel combination wide frequency communications system as the object of study, take the pseudo-random sequence selection technology, the digital modulation technology and
6、 the channel estimate technology as the research content, key has conducted the research to the below question. First of all, the union parallel combination wide frequency communications systems mathematical model, has inferred the pseudo-random sequence related characteristic and the parallel combi
7、nation wide frequency communications system influence mathematical expression. Has analyzed the m_W serial correlation characteristic technology characteristic and the practical application limitation; Proposed the application complete supplementary sequence takes the parallel combination wide frequ
8、ency communications systems pseudo-random sequence, proves its feasibility through the theoretical analysis and the software simulation. Secondly, in view of the different channel environment, has designed two kind of parallel combination wide frequency system entire digitization modulation scheme,
9、namely is suitable for the stationary type fiber channels entire digitized .MASK modulation scheme, is suitable for the wireless fading channels entire digitized MSK modulation scheme. Finally, take sharpens the parallel combination wide frequency communications system wireless channel environment a
10、daptiveness as the goal, has carried out the channel estimate technology research; Proposed based on the continual pilot frequencys channel estimate plan, and has carried on the software simulation confirmation.Key words: PCSS； Channel estimation；Modem mode；Correlation performance of sequences.目 录第
11、1 章 绪论 .11.1 研究背景和研究意义 .11.2 相关技术的发展现状 .31.2.1 扩频通信技术 .31.2.2 并扩通信技术 .41.2.3 扩频系统中伪随机序列 .51.3 论文主要内容及章节安排 .61.3.1 主要的研究内容 .61.3.2 论文的章节安排 .7第 2 章 并扩通信系统及关键技术 .82.1 引言 .82.2 高效扩频系统数学模型 .92.2.1 软扩通信体制 .92.2.2 并扩通信体制 .112.2.3 自适应并扩通信体制 .132.3 并扩通信系统性能分析 .142.3.1 信息传输能力分析 .142.3.2 抗噪性能分析 .152.4 并扩通信系统关键技术 .172.4.1 数据-序列映射技术 .
