OFDM系统PAPR和OOB辐射联合抑制算法研究  

Research on the joint suppression algorithm of PAPR and OOB radiation in OFDM systems

作　　者：王浩 刘凯明[1] WANG Hao;LIU Kaiming(School of Electronic Engineering,Beijing University of Posts and Telecommunications,Beijing 100876)

机构地区：[1]北京邮电大学电子工程学院,北京100876

出　　处：《高技术通讯》2024年第2期143-150,共8页Chinese High Technology Letters

基　　金：国家自然科学基金创新研究群体(61821001)资助项目。

摘　　要：正交频分复用(OFDM)技术具有频谱效率高和抗多径衰落能力强的优点,但存在高峰值平均功率比(PAPR)和高带外(OOB)辐射的固有缺点。部分PAPR抑制算法会导致OOB辐射升高,因此需要一种联合抑制OFDM系统的PAPR和OOB辐射的算法。本文提出了一种新的结合线性压扩和简化限幅滤波的混合式PAPR和OOB辐射联合抑制算法,该算法采用连续分段线性压扩(CPLC)算法抑制信号PAPR,并对压扩后的信号进行频域滤波;然后采用简化限幅滤波(SCF)算法降低频域滤波导致的峰值再生,保证信号的OOB辐射不再升高。接收端采用迭代接收算法提高系统的误码率性能。仿真结果表明,与CPLC、SCF方案相比,所提算法可以达到更好的PAPR和OOB辐射联合抑制性能,同时通过迭代接收算法获得与原始信号相近的误码率(BER)性能。Orthogonal frequency division multiplexing(OFDM) technology has the advantages of high spectral efficiency and strong resistance to multipath fading,but it has inherent disadvantages of peaking average power ratio(PAPR)and high out-of-band(OOB) radiation.Some PAPR suppression algorithms can lead to increased OOB radiation,so an algorithm that jointly inhibits PAPR and OOB radiation in OFDM systems is needed.In this paper,a new hybrid PAPR and OOB radiation suppression algorithm combining linear compression and simplified clipping filter is proposed.The algorithm adopts continuous piecewise linear compression(CPLC) algorithm to suppress signal PAPR,and filters the signal after compression in the frequency domain,and then adopts the simplified clipping filter(SCF) algorithm to reduce the peak regeneration caused by frequency domain filtering.At the same time,the OOB radiation of the signal is not increased.The iterative receiving algorithm is used to improve the bit error rate performance of the system.The simulation results show that compared with CPLC and SCF schemes,the proposed algorithm can achieve better combined suppression performance of PAPR and OOB radiation,and the bit error rate(BER) performance is similar to the original signal through the iterative receiving algorithm.

关 键 词：正交频分复用(OFDM) 峰值平均功率比(PAPR) 带外(OOB)辐射 线性压扩 限幅滤波(CF) 

分 类 号：TN929.53[电子电信—通信与信息系统]