OFDMA系统降低PAPR的DCT-ACE算法
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摘要
针对正交频分多址(OFDMA)系统的高PAPR问题,提出一种离散余弦变换(DCT)和动态星座扩展(ACE)的联合算法。首先对调制信号在频域进行DCT变换,从而降低大峰值信号出现的概率。对信号做星座扩展,通过改变星座点位置,减少信号同相的概率,以此降低OFDMA系统的PAPR。在16QAM的OFDMA信号模型下对新算法PAPR、计算复杂度和误码率(BER)进行仿真分析,与DCT算法、ACE算法和一些改进算法相比,所提算法在不增加复杂度的前提下,具有更强的PAPR抑制能力,且基本不会降低BER性能。
A joint algorithm of discrete cosine transform(DCT) and convex set-mapped active constellation expansion(ACE) is proposed to reduce the PAPR(peak-to-average power ratio) of OFDMA(orthogonal frequency-division multiple access)system. The DCT is carried out for the modulated signal in the frequency domain to reduce the occurrence probability of high peak signal,and then constellation expansion is performed for the signal to reduce the in-phase probability of signal by changing the positions of constellation points,by which the PAPR of OFDMA system is reduced. The PAPR,computational complexity and bit error rate(BER) of the new algorithm are simulated and analyzed by using the 16 QAM OFDMA signal model. In comparison with the DCT algorithm,ACE algorithm and other improved algorithms,the proposed algorithm has higher PAPR suppression ability and can remain the BER performance without increasing the complexity.
A joint algorithm of discrete cosine transform(DCT) and convex set-mapped active constellation expansion(ACE) is proposed to reduce the PAPR(peak-to-average power ratio) of OFDMA(orthogonal frequency-division multiple access)system. The DCT is carried out for the modulated signal in the frequency domain to reduce the occurrence probability of high peak signal,and then constellation expansion is performed for the signal to reduce the in-phase probability of signal by changing the positions of constellation points,by which the PAPR of OFDMA system is reduced. The PAPR,computational complexity and bit error rate(BER) of the new algorithm are simulated and analyzed by using the 16 QAM OFDMA signal model. In comparison with the DCT algorithm,ACE algorithm and other improved algorithms,the proposed algorithm has higher PAPR suppression ability and can remain the BER performance without increasing the complexity.
引文
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[7]张博叶,李艳萍,耿晓文.降低MIMO-OFDM系统峰均比的QAP算法研究[J].现代电子技术,2017,40(5):19-21.ZHANG Boye,LI Yanping,GENG Xiaowen.Research on QAP algorithm for PAPR reduction of MIMO-OFDM system[J].Modern electronics technique,2017,40(5):19-21.
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[9]KANG Ce,LIU Yi,HU Meixia,et al.A low complexity PAPRreduction method based on FWFT and PEC for OFDM systems[J].IEEE transactions on broadcasting,2017,63(2):416-425.
[10]XU Renhui,WANG Lei.A unitary precoder for optimizing spectrum and PAPR characteristic of OFDMA signal[J].IEEE transactions on broadcasting,2018,64(2):293-306.
[2]ZHUANG Ling,LIU Lu,LI Jibi,et al.Discrete sine and cosine transforms in single carrier modulation systems[J].Wireless personal communications,2014,78(2):1313-1329.
[3]RAHMATALLAH Y,MOHAN S.Peak-to-average power ratio reduction in OFDM system:a survey and taxonomy[J].IEEEcommunications surveys&tutorials,2013,15(4):1567-1592.
[4]HAO M J,LAI C H.Precoding for PAPR reduction of OFDMsignals with minimum error probability[J].IEEE transactions on broadcasting,2010,56(1):120-128.
[5]JORGE F S,DANIEL R,ROBERTO L V.Active interference cancellation for OFDM spectrum sculpting:linear processing is optimal[J].IEEE communications letters,2014,18(9):1543-1546.
[6]WANG Zhongpeng.Combined DCT and companding for PAPRreduction in OFDM signals[J].Journal of signal&information processing,2011,2(2):100-104.
[7]张博叶,李艳萍,耿晓文.降低MIMO-OFDM系统峰均比的QAP算法研究[J].现代电子技术,2017,40(5):19-21.ZHANG Boye,LI Yanping,GENG Xiaowen.Research on QAP algorithm for PAPR reduction of MIMO-OFDM system[J].Modern electronics technique,2017,40(5):19-21.
[8]ABOUTY S,LI R,ZENG F.New SLM technique with low complexity based on matrices combined with DCT transform for PAPR reduction in OFDM communication systems[J].Journal of convergence information technology,2012,7(17):232-242.
[9]KANG Ce,LIU Yi,HU Meixia,et al.A low complexity PAPRreduction method based on FWFT and PEC for OFDM systems[J].IEEE transactions on broadcasting,2017,63(2):416-425.
[10]XU Renhui,WANG Lei.A unitary precoder for optimizing spectrum and PAPR characteristic of OFDMA signal[J].IEEE transactions on broadcasting,2018,64(2):293-306.