QPSK基带数字相干解调的载波提取
CARRIER EXTRACTION OF QPSK BASEBAND DIGITAL DEMODULATION
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摘要: 本文介绍了基带数字相干解调的载波恢复锁相环的结构原理,并对其进行了性能分析。与四倍频方法比较,在相同条件下,前者比后者环路信噪比高5--10dB。实验结果表明,恢复的载波稳定性良好。
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关键词:
- 数字通信; 相干解调; 锁相环
Abstract: The principle and structure of the carrier recovery PLL of baseband digl-tal coherent demodulation are presented, and the performance of this PLL is analysed. Comparing with the four times frequency method under the same conditions, the signal to noise ratio of this PLL is 5-10dB higher. The experimenta! results show that the recovered carrier is stable. -
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