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| 基于costas环的QPSK信号解调的研究与实现 |
| Research and Implementation of Demodulation of QPSK Signal Based on the Costas |
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| DOI：10.3969/j.issn.1671-5322.2012.01.014 |
| 中文关键词: QPSK 解调 costas环 仿真 |
| 英文关键词: QPSK demodulation costas simulation |
| 基金项目: |
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| 中文摘要: |
| 在MATLAB平台研究costas环法QPSK信号解调的实现,给出了整个同步过程的仿真模型,各部分的具体实现和关键部分的仿真结果。选择接收信号与本地载波的频差为10 kHz进行仿真,观察同步过程和解调结果,改变频差,观察同步时间,最后改变仿真参数,得到costas环的锁相范围和锁相精度。仿真结果表明,该模型能够实现QPSK信号的快速正确解调,载波同步时间与本地载波和接收信号之间的频率差有关。 |
| 英文摘要: |
| The achievement of demodulation based on costas method using MATLAB is discussed and the entire synchronization process simulation model,the detail structure of each part and simulation results of critical part are given.In simulation,choosing deviation of received signal and local carrier frequency is 10 KHz,observing the synchronization process and the demodulation result,change the frequency deviation,observe the synchronization time,and finally change the simulation parameters,the range and accuracy of coatas loop are obtained.Simulation results show that the model can demodulate QPSK signal correctly.Synchronization time depends on deviation between the local carrier frequency and received signal frequency. |
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