| 摘要: |
| 为解决高速QPSK信号全数字解调的技术瓶颈问题，采用模拟方案
，研制了一种四次方环载波恢复电路，重点介绍了应用混频器上变频特性的宽带平方电路以
及锁相环（PLL）载波提取电路的设计过程。测试结果表明，该载波恢复电路可以完成载频
为720 MHz、码速率100 Mbit/s～1 Gbit/s范围的QPSK信号同步载波恢复，解
决了高速信号相干解调中载波同步的关键技术问题。 |
| 关键词: 卫星数据传输 高速QPSK 全数字解调 四次方环 载波恢复 |
| DOI： |
|
| 基金项目: |
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| A fourth power carrier recovery circuit for high-rate QPSK demodulation |
| WANG Zhi-chao,WANG Ping-lian |
| (Academy of Opto-Electronics, Chinese Academy of Sciences,Beijing 100094,China;Graduate University of Chinese Academy of Sciences,Beijing 100094,China;General Establishment of Space Science and Application,Chinese Academy of Sciences,Beijing 100094，China) |
| Abstract: |
| In order to solve the technical bottleneck of all-digital demodulation for high-
rate QPSK signal, a fourth power carrier recovery circuit which uses analog sche
me is developed. And especially, the design process of broadband square circuit
which applies the frequency up-conversion character of mixer and PLL carrier ext
raction circuit is introduced. The test results show that the circuit can comple
te the carrier synchronization for QPSK signal whose carrier frequency is 720 MH
z and bit rate is in 100 Mbit/s～1 Gbit/s, which resolves the key techni
cal problem of carrier synchronization in the coherent demodulation of highrat
e signal. |
| Key words: satellite data transmission high-rate QPSK all-digita
l demodulation fourth power loop carrier recovery |
