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文档编号:TX322 文档字数:8700,页数:37 摘要 本文介绍了数字调制解调技术中的pi/4-QPSK和pi/4-DQPSK调制技术，其中重点对pi/4-DQPSK进行了性能仿真。pi/4-DQPSK能有效地进行非相干解调，在一些不易提取载波的场合很有用。因此，利用仿真来研究 pi/4-DQPSK系统是必要的。本文从发射端到接收端对各部分提出了其数学模型，首先介绍了pi/4-DQPSK调制技术的原理以及仿真框图，然后以MATLAB为仿真工具，通过分析仿真通信系统的各个模块，分析了在AWGN信道和瑞利信道下pi/4-DQPSK的误码率，并以pi/4-QPSK作为参考对象，比较了pi/4-QPSK和pi/4-DQPSK的系统性能。最后仿真加入升余弦滤波器后对误码率的影响。通过仿真实验来比较信噪比可知，在相同的情况下，pi/4-DQPSK的误比特率要略低于pi/4-QPSK。 关键词：pi/4-QPSK，pi/4-DQPSK，AWGN信道，瑞利信道 The paper introduces the pi/4-QPSK and pi/4-DQPSK moderation and demodulation, specifically, the simulation focus on the pi/4-DQPSK moderation and demodulation. Generally, the pi/4-DQPSK could operate the differential moderation and demodulation effectively, especially useful in the situation that difficult to purify the carrier wave. Therefore, It is necessary to utilize the simulation in the research of the pi/4-DQPSK. In this paper, it illuminates each of the block diagrams from sender to receiver. Firstly, it introduce the principle and simulation figure of the pi/4-QPSK and pi/4-DQPSK technology, then use the MATLAB as the simulation instrument, according to analyze each simulation block of the communication system, compared the number of error between pi/4-QPSK and pi/4-DQPSK in the AWGN channel and Rayleigh channel., and the influence of result after add the RC filter. Base on the comparison of the signal noise ratio resulted from the above method, the quality of moderation and demodulation of pi/4-QPSK is superior in the same environment. Keywords: pi/4-QPSK, pi/4-DQPSK, AWGN channel, Rayleigh channel
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| Tags：Pi4-DQPSK 系统 性能 MATLAB 仿真 | 2011-04-01 09:03:43【返回顶部】 |
