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软件无线电 (SoftwareRadio简称SWR)是 90年代提出的一种全新的无线通信体系结构 ,它可使通信系统具有良好的灵活性及可扩展性。为使软件无线电中实现通用无线通信系统 ,较为理想的情况就是使A/D和D/A变换器尽量向射频端靠拢 ,即完成射频到中频的下变频后 ,对整个中频频段作A/D变换。这之后整个处理都用可编程数字器件以及软件来实现。这样的实现结构将具有非常大的灵活性 ,可以满足软件无线电的灵活性和可扩展性 ,但是系统就对数字前端 (AD和数字下变频 )提出了较高的要求。本文提出了一种软件无线电数字前端的实现方案 ,可以大大降低对AD及数字下变频的要求。
Software Radio (SoftwareRadio referred to as SWR) is the 90’s proposed a new wireless communication architecture, it can make the communication system has good flexibility and scalability. In order to realize the general wireless communication system in the software radio, the ideal situation is to make the A / D and D / A converters as close as possible to the radio frequency end, that is to finish down-converting the radio frequency to the intermediate frequency, after performing the A / D transform. After that, the entire process is implemented using programmable digital devices and software. Such an implementation will have a great deal of flexibility to meet the flexibility and scalability of software radios, but the system places high demands on the digital front end (AD and digital downconversion). This paper presents a software digital front-end implementation of the program, which can greatly reduce the AD and digital down conversion requirements.