摘要
现代扩频通信中广泛采用平方根升余弦滚降数字滤波器作为成形滤波器。首先在理论上介绍了扩频通信系统最佳接收对滤波器的要求,然后用MATLAB对成形滤波器的3个主要参数做了仿真和分析,并选取最优参数设计出满足一种图像传输系统要求的成形滤波器,最后基于QUARTUSII平台分别用查表法和实时计算法实现了发送端和接收端的成形滤波器,验证了结论,对基于FPGA的无线通信模型的设计有重要意义。
Square-root raised cosine roll-off digital filter was widely applied to shaping filter and in modem spread spectrum communication system.This paper first discuss the request of shaping filter for best receiving and the three main parameters of this filter,then simulate and analyze the three main coefficient of the shaping filter by MATLAB,and design a shaping filter adapted a system of image transmitting with the best coefficient.At last this paper implement the shaping filter with table looking up at transmitting end and caclating real-time at receive end bssed on QUARTUSII.This paper is very meaningful for the wireless modem design based on FPGA.
出处
《电子测量技术》
2010年第10期44-47,共4页
Electronic Measurement Technology
关键词
扩频通信
成形滤波器
升余弦
FPGA
spread spectrum communication
shaping filter
raised cosine
FPGA
