摘要
为解决MPSK体制信号解调中可能存在的较大载波频偏,介绍一种结合基于最大似然准则的FFT频偏估计与通用载波锁相环的多调制体制通用载波同步方案。依次分析了该方案的算法原理、结构特点与运算和硬件复杂度,并说明该算法在FPGA上实现该方案的整体结构安排与关键技术要点。在Xilinx的XC4VLX200芯片上实现了该电路。结果表明该电路可完成对较大的频偏、较低的信噪比条件下MPSK信号载波同步工作,具有较好的工程应用价值。
In order to resolve the problem of large frequency-offset in the MPSK signal,a multi-modulation universal carrier synchronization scheme is introduced,which is based on a maximum likelihood FFT frequency estimator and universal carrier PLL.The algorithm principle,structure characterstics and complexity of the scheme and hardware are analyzed.The whole structure and key techniques for this scheme on FPGA devices are illuminated.Finally,this circuit is validated with Xilinx＇s XC4VLX200.The results show that this circuit can be used for the carrier synchronization of MPSK signals with large frequency-offset and low SNR,and it has great application value in project.
出处
《无线电工程》
2010年第4期13-15,共3页
Radio Engineering
基金
国家自然科学基金
中国工程物理研究院联合基金(NSAF)资助项目(10876103)
关键词
FPGA
载波同步
FFT
通用载波环
FPGA
carrier synchronization
FFT
universal carrier recovery loop
