一种新型的快速多分辨率频谱感知电路设计

Design of Novel Multi-Resolution Spectrum Sensing Circuit with Improved Sensing Time

设计了一种改进型的多分辨率频谱感知电路,用于认知无线电的快速感知功能.传统基于窗函数的多分辨率频谱感知方法的探测时间和探测频谱精度相互制约,针对这个缺点,在系统架构上予以改进：通过在窗函数相关前增加可重构滤波器进行预滤波,打破了探测时间和频谱分辨率的折中关系,增加探测精度,减少探测时间;同时可以实现频谱分辨率的自由调节.设计采用TSMC0.13μm CMOS工艺,在1.2 V的电源电压下的功耗为30 mW.测试结果显示,设计实现-65 dBm探测精度,31 dB动态范围,1~20 MHz的频谱分辨率选择,仅1μs的单点探测时间.

A novel multi-resolution spectrum sensing circuit with improved sensing time is proposed to realize the spectrum sensing function in cognitive radio.Putting reconfigurable filter before the multiplier,this design breaks the tradeoff between sensing time and frequency resolution.In addition,the frequency resolution could be adjusted freely by the reconfigurable filter.Implemented in 0.13μm CMOS process,the circuit operating at 1.2V supply voltage dissipates 30mW of power.Test results show the spectrum resolution covers range from 1MHz to 20MHz;the sensing sensitivity achieves-65 dBm with 31dB dynamic range with only 1μs sensing time per frequency point.