摘要
软件无线电是一种全新的无线电通信体系结构,其基本思想是把硬件作为无线通信的基本平台,而把尽可能多的无线通信功能用软件来实现。随着半导体和微电子技术的发展,在中频完成全数字化解调已成为可能。本文就是对 70MHz的中频QPSK信号进行直接带通采样,然后送入已写入载波同步算法和定时同步算法的FPGA中,从而完成对QPSK信号的全数字化解调,由于采用了可动态配置的FPGA来实现QPSK信号的解调,因此只需通过软件对其参数进行适当的设置,就可以完成对多种数据传输率、多种中频载波的QPSK信号的解调。
Software defined radio is a kind of new wireless communication system structure, the main principle was using the hardware as a basic platform of wireless communication, implement function of the wireless communication using software. In the paper, direct band pass sampling was used to QPSK signal with 70 MHz IF, and complete demodulation with FPGA which has carrier recovery and timing synchronization algorithms, using reconfigurable device. You can demodulate multi_rate & multi_IF_Carrier after you change some parameter properly.
出处
《中国有线电视》
2005年第6期557-561,共5页
China Digital Cable TV
