基于动态功率阈值降低PAPR的部分传输序列算法  

Partial transmit sequences algorithm to reduce peak-to-average power ratio based on dynamic power threshold

作　　者：季策[1] 郭伟[1] 张超[1] JI Ce GUO Wei ZHANG Chao(School of Computer Science and Engineering , NorCheasCern U n iv e r s i ty , S h e n y a n g 110169, China)

机构地区：[1]东北大学计算机科学与工程学院,辽宁沈阳110169

出　　处：《系统工程与电子技术》2017年第7期1620-1624,共5页Systems Engineering and Electronics

基　　金：国家自然科学基金(11273001;61273164;61370152)资助课题

摘　　要：为了改善正交频分复用(orthogonal frequency division multiplexing,OFDM)系统的峰均功率比(peak-to-average power ratio,PAPR)性能,提出了一种基于动态功率阈值的低复杂度部分传输序列(partial transmit sequences,PTS)方法。在新的PTS方法中,引入了基于功率的判别函数,并给出了一种基于功率合理选择阈值的方法。在选取最小的PAPR值进行传输时,只对Pn大于等于阈值的样本信号进行峰值功率的计算。与传统的PTS算法相比,本文提出的算法在保证PAPR性能和误码率的情况下,能够更有效地降低计算复杂度。A reduced-complexity partial transmit sequences （P T S ） scheme based on dynamic power threshold is proposed to resolve the intrinsic high peak-t〇 -average p o w e r ratio （PAPR ） problem of orthogonal frequency divi-sion multiplexing （OFDM ） systems. In the proposed PTS s c h e m e , a discrimination function Pn is generated to be compared with the threshold. O n l y those samples with Pn greater than or equal to a preset threshold are used for peak power calculation during the process of selecting a candidate signal with the lowest P A P R for transmis-sion. Compared to the conventional PTS sche m e, the proposed one achieves almost the same P A P R reduction perform-ance and bit error rate（BER ） distribution with m u c h lower computational complexity.

关 键 词：正交频分复用 峰均功率比 部分传输序列 阈值 

分 类 号：TN929.53[电子电信—通信与信息系统]