全数字欠采样脉冲式超宽带接收机系统方案  

All-digital Sub-sampling Architecture for an Impulse Radio Ultra Wideband Receiver

作　　者：蒋俊[1] 许炜阳[1] 邵轲[1] 洪志良[1] 

机构地区：[1]复旦大学专用集成电路与系统国家重点实验室,上海201203

出　　处：《小型微型计算机系统》2011年第8期1684-1688,共5页Journal of Chinese Computer Systems

基　　金：国家"八六三"高技术研究发展计划项目(2009AA01Z261)资助

摘　　要：给出整套可在芯片上集成的脉冲式超宽带接收机系统方案,包括射频前端电路模块架构及设计原则和数字后端算法.采用功率检测器检测ADC输入信号均方根值(RMS),提出通过VGA调整信号的RMS来优化ADC量化误差的方法.接收机采用全数字结构,ADC直接欠采样量化射频前端的放大信号;数字模块先进行信道估计,利用信道估计结果实现符号同步.仿真表明采用4 GSamples/s、3 bits的ADC,Eb/N0等于21dB时,系统误码率可达到2.8x10-4.This paper presents a complete set of IR-UWB receiver system solutions which can be implemented on chip,including the RF front-end circuit architecture with design principles and digital back-end algorithms.The way to optimize A/D conversion quantization error via adjusting RMS by VGA is proposed after that A/D converter input signal′s RMS is detected.The receiver architecture is all-digital,the RF signal is amplified by the RF front-end circuit,and then sub-sampled and quantized in A/D converter.The channel estimation is carried out firstly and then the symbol synchronization is realized using the results of channel estimation in the digital module.Simulation results show that the system BER is 2.8×10-4 with a 4 GSamples/s、3bits ADC when Eb/N0=21dB.

关 键 词：超宽带 脉冲式 接收机 欠采样 信道估计 同步 全数字 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]