多速率软件无线电数字中频系统的研究与实现  

A multi-rate digital intermediate frequency system

作　　者：曹检飞 文双春[1] 刘昱[2] 文延东[1] 

机构地区：[1]湖南大学物理与微电子科学学院,湖南长沙410082 [2]中国科学院微电子研究所,北京100029

出　　处：《计算机工程与科学》2017年第6期1079-1086,共8页Computer Engineering & Science

基　　金：中国科学院国防科技创新重点部署项目(KGFZD-125-13-010)

摘　　要：当前,移动通信技术的迅猛发展,促使传统的基于专用硬件的通信设备所固有的功能单一、不易升级改造的缺点突显出来,导致多种通信协议在兼容和版本升级方面的问题日益严重。而软件无线电技术由于自身的灵活性和开放性,可以很好地解决这些问题。在此基础上,对多速率数字中频系统中的关键技术进行了研究和实现。系统设计为全双工模式,支持多速率收发处理,可根据实际应用的需要进行配置,从而实现多种数据速率的转换。系统主要包括混频器模块、采样率变换(插值和抽取)模块、低通滤波器模块。功能上实现了32、96、480倍的降/升采样处理和240kHz的信号下变频处理,且阻带衰减可以达到60dB,有效地对杂散信号进行了抑制。在灵活配置的系统前提下,对模块进行了优化和复用,不仅节省了硬件开销,而且提高了系统性能。As the mobile communication technology develops rapidly, traditional communication de- vices based on proprietary hardware have limited function and are hard to upgrade, which cause a compatibility issue for a variety of communication protocols and software versions. Software defined radio technology has the advantage of flexibility and openness, and can solve these problems easily. We pres- ent a multi-rate digital intermediate frequency （IF） system implemented by FPGA. The system is de- signed in a full duplex mode and supports multi-rate transceiver~ it can also be configured according to specific applications in order to achieve a variety of data conversion rates. The system includes a mixer module, a sample rate conversion （interpolation and decimation） module, and a low-pass filter module. It realizes 32, 96, 480 times down/up sampling and 240kHz down conversion process. The spurious sig- nals are effectively suppressed while the signal stopband attenuation can reach 60dB. With flexible sys- tem configuration, the module is optimized and reused, which can save hardware cost and improve the performance.

关 键 词：软件无线电 数字中频 混频器 采样率变换 低通滤波器 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]