摘要
本文介绍了8PSK调制方式的原理和相应中频数字化发射机的系统结构,并进一步提出了发射机中多级滤波器各自的作用及实现方法。针对数字化基带成形的处理特点,该文提出一种基于分布式算法和查找表的高速成形滤波器实现方法以基于现场可编程门阵列(FPGA)芯片实现根升余弦FIR滤波器,以及由CIC内插滤波器实现了发射机中的增采样功能。整个设计采用硬件描述语言VerilogHDL实现,通过仿真验证了以这些方法来实现相应的功能是可行的。
The principle of 8PSK modulation and corresponding systematic structure of intermediate frequency digital transmitter is introduced in this paper. Respective function and implement methods of multilevel filter in transmitter is also defined. Aimed at the processing characteristics of digital baseband shaping, this paper puts forward a design method of high speed shaping filter based on distributed arithmetic and look-up table, to implement the square root raised cosine filter based on FPGA structure, as well as implement the sampling increase by using CIC interpolation filter. The entire design is achieved by the Hardware Description Language - VerilogHDL. The results of simulation show these methods is feasible for related functions.
出处
《中国西部科技》
2009年第9期10-12,共3页
Science and Technology of West China
关键词
八相移相键控调制
基带成形
根升余弦滤波器
分布式算法
积分梳状滤波器
8PSK modulation
Base-band shaping
Square root raised cosine filter
Distributed arithmetic
Cascade integrator comb filter
