降低OFDM系统PAPR的低复杂度ACE-C算法A low-complexity ACE-C algorithm for PAPR reduction in OFDM system
韩硕,李艳萍,张博叶
摘要(Abstract)：
针对现有凸集映射星座扩展算法(ACE-POCS)在OFDM信号峰均功率比(PAPR)抑制过程中存在收敛速度慢、复杂度高等问题,提出一种基于ACE-POCS算法与限幅算法(Clipping)的ACE-C算法。新算法通过对输入数据序列进行分组处理,使得在运算过程中只进行低点数的IFFT和FFT变换,有效降低了运算复杂度。在4QAM调制的OFDM系统模型中对新算法的PAPR、复杂度及误码率(BER)性能进行研究分析,结果表明,与ACE-POCS算法相比,ACE-C算法的复杂度减小了1/2以上,收敛速度也得到了一定的提高,且不需要传送边带信息,实现了在PAPR抑制效率、复杂度、误码率三方面性能的折中。
关键词(KeyWords)： 正交频分复用;峰均功率比;星座扩展;限幅分组;复杂度;收敛速度
基金项目(Foundation): 国家自然科学基金项目(61271249)~~
作者(Author): 韩硕,李艳萍,张博叶
DOI: 10.16652/j.issn.1004-373x.2018.03.005
参考文献(References)：
- [1]BAIG I,JEOTI V.DCT precoded SLM technique for PAPR reduction in OFDM systems[C]//2010 International Conference on Intelligent and Advanced Systems.[S.l.]:IEEE,2010:1-6.
- [2]WANG Y C,LUO Z Q.Optimized iterative clipping and filtering for PAPR reduction of OFDM signals[J].IEEE transactions on communications,2011,59(1):33-37.
- [3]SOHN I,KIM S C.Neural network based simplified clipping and filtering technique for PAPR reduction of OFDM signals[J].IEEE communications letters,2015,19(8):1438-1441.
- [4]WANG Y,YANG C,AI B.Iterative companding transform and filtering for reducing PAPR of OFDM signal[J].IEEE transactions on consumer electronics,2015,61(2):144-150.
- [5]LI C P,WANG S H,WANG C L.Novel low-complexity SLM schemes for PAPR reduction in OFDM systems[J].IEEE transactions on signal processing,2010,58(5):2916-2921.
- [6]郝喜国,李艳萍,任腾飞.利用导频降低峰均值比算法的研究[J].现代电子技术,2016,39(13):27-29.HAO Xiguo,LI Yanping,REN Tengfei.Algorithm of using pilot frequency to reduce PAPR[J].Modern electronics technique,2016,39(13):27-29.
- [7]PACHORI K,MISHRA A.PAPR reduction in MIMO-OFDM by using active partial sequence[J].Circuits systems&signal processing,2015,34(12):3999-4010.
- [8]PACHORI K,MISHRA A.An efficient combinational approach for PAPR reduction in MIMO-OFDM system[J].Wireless networks,2015,22(2):1-9.
- [9]KRONGOLD B S,JONES D L.PAR reduction in OFDM via active constellation extension[J].IEEE transactions on broadcasting,2003,49(3):258-268.
- [10]LOULIEJ A,JABRANE Y,SAID B A E,et al.Peak to average power ratio reduction in ECMA-368 ultra wideband communication systems using active constellation extension[J].Wireless personal communications,2013,70(2):677-694.