摘要
阐述了GMSK调制解调的原理与特点,介绍了其在软件无线电系统中的FPGA实现,并对其关键技术进行了分析,最后给出了在FPGA中GMSK信号调制解调的信号仿真图。与传统的通信收发系统不同,该系统的调制解调,上下变频,滤波,同步抽样判决等工作都是通过软件实现的。由于硬件平台的通用性,在该方案中,只需通过软件修改基带调制解调方式,就可以移植到其他通信制式中去,例如OFDM,QPSK等,具有很强的可移植性、灵活性。
This paper introduces the theory and property of GMSK modulation and demodulation, provides its FPGA implementation in SDR（software definition radio） system, analyzes the key technologies of the system, finally gives the plot of simulation signals of GMSK modulation and demodulation in FPGA. Comparing with the traditional communication system, this system＇s modulation, demodulation, DUC, DDC, filtering, synchronization and sampling judge are all implemented by software. Only through modifying baseband modulation and demodulation way, this system is transplanted into other commtmication systems, such as OFDM, QPSK and so on.
出处
《信息技术》
2009年第9期40-43,共4页
Information Technology
