并扩系统通信体制和信道估计技术研究

(57页)

'并扩系统通信体制和信道估计技术研究'
由丁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,由丁其信息载荷能力极强,对信道环境耍求较高的特点,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;捉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;捉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, the 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 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 suitable for in the commercial optical fiber backbone network to cairy 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 the channel estimate technology as the research content, key has conducted the research to the below questio n.First of all, the union parallel combination wide frequency communications system's mathematical model, has inferred the pseudo-random sequence related characteristic and the parallel combination 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 frequency communications system's 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, namely is suitable for the stationary type fiber channeFs entire digitized MASK modulation scheme, is suitable for the wireless fading channefs entire digitized MSK modulation scheme.Finally, take sharpens the parallel combination wide frequency communications system wireless channel environment adaptiveness as the goal, has carried out the channel estimate technology research; Proposed based on the continual pilot frequency's channel estimate plan, and has carried on the software simulation confirmation.Key words: PCSS; Channel estimation; Modem mode; Correlation perf
关 键 词:
系统 通信 体制 信道 估计 技术研究
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本文标题:并扩系统通信体制和信道估计技术研究
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