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论文摘要

基于相位信息的分数傅里叶变换域超宽带接收机

Phase Information Based Fractional Fourier Transform Domain Receiver for Ultra-wideband System

作者:邱昕(哈尔滨工业大学);沙学军(哈尔滨工业大学);吴宣利(哈尔滨工业大学)

Author:Qiu Xin();Sha Xuejun(Harbin Institute of Technology);()

收稿日期:2009-12-18          年卷(期)页码:2011,43(1):157-160

期刊名称:工程科学与技术

Journal Name:Advanced Engineering Sciences

关键字:超宽带;分数傅里叶变换;接收机;相位信息

Key words:Ultra-wideband (UWB);Fractional Fourier Transform (FrFT);receivers;phase information

基金项目:国家重点基础研究发展计划资助项目(2007CB310606);高等学校博士学科点专项科研基金(新教师基金)资助项目(20092302120001);黑龙江省自然科学基金资助项目(F200906)

中文摘要

现有的超宽带接收机在多径分离方面存在一定的限制,为了避免上述问题,提出了一种基于相位信息的分数傅里叶变换域超宽带接收机设计方案。采用Chirp信号作为超宽带脉冲波形,并利用其在分数傅里叶变换域上能量聚集的特性在接收端进行信号滤波,得到多径分量;同时,根据分数傅里叶变换的时移性质,利用多径到达时间及多径到达相位的估计得到模板多径处的相位校正因子;最后,将接收到的信号与相位校正因子结合起来,并利用相关判决得到对数据信息的估计。仿真结果表明,通过对相位信息的校正可以得到比传统接收机更好的系统误码性能;而且由于符号间干扰对系统的影响并不严重,可以实现高数据速率的信号传输。

英文摘要

A Fractional Fourier Transform domain receiver for Ultra-wideband system was proposed to avoid the restriction of the multi-path separation in the existing receivers. Chirp signals with concentration in Fractional Fourier Transform domain were used as pulse waveforms in the system designed, and the energy aggregation characteristic of Chirp signals was used to obtain the multi-path component by filtering in fractional domain. According to the time-shiftng property of Fractional Fourier Transform, the phase correction at the multi path positions of template signal was made by the phase correction factor in fractional domain, which was got from the estimated delay and the phase of the multi-paths in time domain. At last the demodulation was made, combining the received signal with the phase correction factor. The simulation results indicated that the proposed receiver could get the better BER performance than conventional receivers. Moreover, because the influence of inter-symbol interference was not serious, high data rate transmission could be achieved.

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