基于π/4D-QPSK的无线收发器的设计和实现

Design and realization of wireless transmitter and receiver based on π/4D-QPSK

根据应用要求,用户组建专用无线数据传输系统,需要一种通用、灵活、可软件重配置的收发器。本文介绍一种基于π/4D-QPSK调制的无线收发器的总体设计、软件仿真验证和工程实现。总体设计包括系统组成结构、π/4D-QPSK的差分编码和差分解码、SRRC滤波器设计,以及符号时钟同步算法实现等。在仿真测试中,用Simulink仿真测试了系统的误码率曲线。在工程实现中,选用AD公司的通用无线发送信号处理器AD6623和接收信号处理器AD6652,以及通用数字信号处理器TS101S实现了收发器,使收发器具有极大的灵活性和可重配置性。

A general, flexible and program reconfigurable wireless transmitter and receiver is needed to build up the specific wireless data communication system for achieving some specific application demands. The structural design, simulation test and engineering implementation of such a kind of transceiver are described in the paper. In the structural design, the major design steps in π/4D-QPSK modem, such as differential encoding and decoding, SRRC filter, symbol clock synchronizing techniques are described in detail. In simulation test, the bit-error performance of the transceiver, which was obtained with Simulink simulation test, shows that the correctness of the design. Finally, the transceiver connecting with PC by USB interface is built up with a transmitting signal processor (TSP) AD6623, a receiving signal processor (RSP) AD6652, and a general-purpose digital signal processor (DSP) TS101S. All of these components make the system a great flexibility to satisfy the demands of many applications.