高速可变速率QPSK模拟源设计与实现

摘要

通信系统带宽与速率逐步提高, 要求与之匹配的模拟源速率相应提高. 介绍一种高速且可变速率的QPSK调制模拟源的实现方案, 数据速率为20~600 Mbps且每bit可变. 详细描述了核心并行数控振荡器 ( NCO) 及成型滤波模块的设计与实现, 对工程应用以及测试结果进行了分析. 结果表明模拟源各项功能指标达到了设计要求, 设计灵活, 可扩展性强, 满足多速率通信系统的测试要求.%The bandwidth and data rate of communication systems are gradually increasing, which requires a corresponding increase in the rate of the simulating source. The implementation scheme of a high and variable data rate QPSK simulating source is introduced,in which the data rate changes from 20 to 600 Mbps with an accuracy of one bit.The design and implementation of the core module including the parallel numerical controlled oscillator and the shaping filter are described in detail.The system engineering appli-cations and test results are analyzed.The results show that the function specifications of the simulating source meet the design require-ments.The system is flexible and easily expanded,which meets the test requirements of multi-rate communication system.