载波干涉降低NC-OFDM系统峰均功率比的方法  

Method of CI reducing PAPR of NC-OFDM system

作　　者：方荟[1] 

机构地区：[1]闽江学院计算机科学系,福建福州350121

出　　处：《闽江学院学报》2014年第5期51-55,共5页Journal of Minjiang University

基　　金：福建省中青年教师教育科研项目(JB12152)

摘　　要：尽管非连续正交频分复用(NC-OFDM)具有消除对认知无线电授权用户干扰的独特优势,但是和其他OFDM技术一样,NC-OFDM也存在如何降低峰值平均功率比(PAPR)的问题.提出将载波干涉(CI)应用于NC-OFDM系统,以期利用CI扩展码本身的构造特点,降低NC-OFDM系统的PAPR.首先分析了CI的编码原理,接着搭建了基于载波干涉的NC-OFDM(CI/NC-OFDM)基带系统模型.理论分析和仿真实验表明,在大于某基准峰均比值出现概率相同的条件下,CI/NC-OFDM系统的基准峰均比值均会较NC-OFDM系统的低3 dB左右.该方法有效且易行,同时可以改善系统的误码性能.Although non-continuous OFDM （NC-OFDM） has the unique advantage of eliminating in- terference to authorized user in cognitive radio context, it also confronts a difficulty of reducing peak to average power ratio （PAPR） like other OFDM techniques. In this paper, carrier interferometry is pro- posed to apply in NC-OFDM system in order to reduce its PAPR using the construction feature of CI code itself. The coding principle of CI code is analyzed at first. Then NC-OFDM system based on car- rier interferometry （CI/NC-OFDM） is modeled. Theoretical analysis and matlab simulation results in- dicate that CI code can bring 3 dB lower PAPR reference with the same probability of exceeding some PAPR reference, compared with traditional NC-OFDM system. This method is effective and feasible and gets better BER performance as well.

关 键 词：非连续正交频分复用 CI扩展码 峰值平均功率比 

分 类 号：TN929.5[电子电信—通信与信息系统]