认知无线电非连续载波干涉测量码的研究

M. Mukherjee, Prashant Kumar, Rakesh Matam
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引用次数: 0

摘要

在动态频谱接入(DSA)和认知无线电(CR)系统中提出了非连续载波干涉(NC-CI)特征波形。当非连续载波数不是4的倍数时,Walsh-Hadamard (WH)码不能保证非连续载波分配的正交性。文献中提出了任意码长的NC-CI码和二元正交码用于非连续频谱分配。在AWGN信道上,通过仿真分析,评估了非连续CI正交频分复用(NC-CI/OFDM)和NC-CI多载波码分多址(NC-CI/MC-CDMA)下NC-CI特征波形的互相关特性。时域NC-CI波形也被检查了非连续分配。相互关分析和时域波形表明,在单用户和多用户环境下,NC-CI码在非连续子载波分配情况下保持正交性。对于WH代码,已经证明了在丢失数据速率的情况下可以保持正交性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A study on Non-contiguous Carrier Interferometry code for Cognitive Radio
Non-contiguous Carrier Interferometry (NC-CI) signature waveforms have been proposed for Dynamic Spectrum Access (DSA) and Cognitive Radio (CR) system in the literature. Walsh-Hadamard (WH) codes cannot ensure orthogonality for non-contiguous carrier allocation, when the number of non-contiguous carrier is not a multiple of 4. In literature, NC-CI and binary orthogonal codes of any code length are proposed for non-contiguous spectrum allocation. In this paper the cross-correlation properties of NC-CI signature waveforms for non-contiguous CI orthogonal frequency division multiplexing (NC-CI/OFDM) and NC-CI multicarrier code division multiple access (NC-CI/MC-CDMA) have been evaluated through simulation and analysis over AWGN channel. Time domain NC-CI waveforms have also been examined for non-contiguous allocation. Cross-correlation analysis and time domain waveforms show that NC-CI codes maintain orthogonality over non-contiguous subcarrier allocation in single user and multiuser environments. For WH code, it has been shown that orthogonality can be maintained with a loss of data rate.
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