基才DSP的4／πQPSK调制解调器的设计

摘要

QPSK调制解调器与具有强大数字信号处理功能的DSP芯片相结合，实现了调制解调的高效实时处理。系统采用TI公司的TMS320C5409为核心处理器，设计了硬件电路系统的3个主要模块，包括A／D转换模块，程序存储器模块和数据存储器模块。将一种简单高效的定时同步算法——最大平均功率定时同步算法引入到系统的解调设计中，以提高定时同步的运算速度和准确性。系统软件采用汇编语言编写，并通过CCS软件仿真，结果证明该算法能够完成4／πQPSK调制解调的全部功能，且具有体积小、功耗低、集成度高、软件可移植性强等优点。%In order to realize efficient real-time processing of modulation/demodulation, QPSK modem and DSP chip with powerful digital signal processing function are combined into the system. The system used the TI＇s TMS320C5409 as core process, and hardware design was divided to three parts ,which were A / D converter module, program memory and data memory module. A simple and efficient timing synchronization algorithm-maximum average power timing synchronization algorithm is introduced to the system demodulation design, to improve the speed and accuracy of timing synchronization. The System software was written in assembly language, and simulated by CCS software. The results show that the algorithm is able to complete all functions of 4/ax QPSK modem, with the advantages such as a small size, low power consumption, high integration and software portability, etc.