摘要： 认知无线电(CR)资源分配中二级用户对主用户造成的干扰源于两方面,即带外频谱泄露和频谱感知错误。滤波器组多载波(FBMC)技术和正交频分复用(OFDM)技术相比,FBMC带外泄露较小,频谱利用率较高。FBMC技术考虑干扰来源,可以降低二级用户对主用户的干扰,提高CR系统吞吐量。为此,提出考虑频谱感知错误的CR资源分配算法,建立干扰模型,将资源分配分步简化为载波分配和功率分配,在干扰约束和功率约束条件下对二级用户进行功率分配。基于FBMC和OFDM系统的仿真结果表明,该算法对主用户造成的干扰更小,CR系统可以获得更大的吞吐量,FBMC的干扰和吞吐量性能均优于OFDM。

关键词: 频谱感知错误, 认知无线电, 滤波器组, 资源分配, 正交频分复用, 多载波技术

Abstract: The interference in Cognitive Radio(CR) resource allocation introduced by the Secondary User(SU) to the Primary User(PU) derives from two aspects:Out-of-Band Leakage(OOBL) and Spectrum Sensing Error(SSE).Filter Bank Multicarrier (FBMC) has small OOBL and high spectral efficiency in comparison with Orthogonal Frequency Division Multiplexing(OFDM).Full consideration of interference sources can reduce the interference from SU to PU and improve CR system throughput.So this paper proposes a resource allocation algorithm considering SSE in CR network,establishes the interference model,decomposes resource allocation into subcarrier allocation and power allocation,and allocates the power to SU under both interference constraint and power constraint.Simulation results based on FBMC and OFDM show that the proposed algorithm causes less interference to PU.The CR system can obtain greater throughput,and the performance of FBMC in interference and throughput is better than that of OFDM.

Key words: spectrum sensing error, Cognitive Radio(CR), filter bank, resource allocation, Orthogonal Frequency Division Multiplexing(OFDM);multicarrier technology

中图分类号: 

• TN911