基于FPGA的PSK解调器实现

Implementation of FPGA-based PSK demodulator

自适应调制系统要求其解调器能够对多种调制方式进行解调。通过研究发现,采用合理电路结构与算法,可使基于FPGA(field-programmable gate array)的PSK(phase shift keying)数字解调器在仅改变部分电路结构的情况下,对多种PSK调制方式进行解调。对一些现有解调技术进行探讨,并利用这些算法,设计了一种基于FPGA的可实现解调多种PSK调制方式的数字解调器。并通过ISE与ModelSim软件,在Xilinx公司的XC4VLX60芯片上进行了实现。综合和仿真结果表明,解调器工作效果良好,可应用于自适应调制系统中。

The adaptive modulation system requires its demodulator can demodulate various modulation modes.By researching digital demodulation techniques deeply,we find out that an FPGA-based digital PSK demodulator can be used to demodulate various PSK modulated mode,with partial circuit structure changed rather than the whole,when chosen reasonable circuit structure and algorithms.We designed an FPGA-based digital demodulator,which can be used to demodulate various PSK modulated mode,employing those algorithms we discussed in the paper.With the ISE and ModelSim software,we also implement this design on XC4VLX60 produced by Xilinx.Simulation results show that this demodulator has high performance,and that can be used in adaptive modulation system.