Precoding with interference suppression sequence scheme for OFDM-based cognitive radio systems

作     者：ZHAO Cheng-lin ZHANG Kun SUN Xue-bin JIANG Ting 

作者机构：Key Laboratory of Universal Wireless Communication Ministry of Education Beijing University of Posts and Telecommunications Beijing 100876 China 

出 版 物：《The Journal of China Universities of Posts and Telecommunications》 (中国邮电高校学报（英文版）)

年 卷 期：2011年第18卷第4期

页      面：59-64页

核心收录：

学科分类：11[军事学] 0810[工学-信息与通信工程] 1105[军事学-军队指挥学] 08[工学] 081001[工学-通信与信息系统] 081002[工学-信号与信息处理] 110503[军事学-军事通信学] 

基　　金：supported by the National Science and Technology Specific Major Projects (2009ZX03006-006, 2009ZX03006-009) the National Natural Science Foundation of China (60432040,60972079) 

主　　题：OFDM cognitive radio precoding spectrum shaping 

摘      要：Orthogonal frequency division multiplexing （OFDM） is considered to be one of the promising schemes for cognitive radios （CR） systems, due to its flexibility in spectrum shaping. However, the traditional way of spectrum-notching failed to suppress out-of-band leakage enough, resulting in interference with licensed users （LUs）. A novel spectrum shaping scheme is proposed in this article, where a precoder with interference suppression sequence （ISS） is for the first time introduced for shaping the spectrum of OFDM signals in OFDM-based CR systems. The precoder matrix together with ISS matrix is obtained by minimizing the power of out-of-band interference, which results in the sufficient interference suppression of OFDM signal to LUs Analysis and simulation results show that the proposed scheme can significantly suppress the interference power to LUs at a little cost of precoding efficiency. Meanwhile, the peak-to-average-power-ratio （PAPR） is invariable and the bit-error-rate （BER） performance over Rayleigh fading channel is improved.