High peak-to-average-power ratio(PAPR) and spectral leakage are two main drawbacks of multicarrier systems, such as in orthogonal frequency division multiplexing(OFDM), in future 5G wireless communications. For genera...High peak-to-average-power ratio(PAPR) and spectral leakage are two main drawbacks of multicarrier systems, such as in orthogonal frequency division multiplexing(OFDM), in future 5G wireless communications. For generating optimized wave forms for 5G communications, this paper proposes an iterative scheme combining time-domain N-continuous OFDM(TD-NC-OFDM) and serial peak cancellation(SPC). Based on the theory of projection onto convex sets(POCS), the effectiveness of the proposed scheme is proved, and the optimized time-frequency domain multicarrier waveforms are analyzed in terms of a balanced tradeoff between out-of-band spectral leakage and PAPR. Both theoretical analysis and simulation results show that the proposed scheme can jointly optimize both the PAPR and out-ofband radiation, with moderate computational complexity.展开更多
The complex-valued modulating vectors for the subcarriers consist of two kinds of components: One is the information-bearing components superposed with pseudo-randomized phases and the other is the suppression compone...The complex-valued modulating vectors for the subcarriers consist of two kinds of components: One is the information-bearing components superposed with pseudo-randomized phases and the other is the suppression components with specified scrambling phases. The pseudo randomized phases are generated according to the predefined polynomial and mapping function whereas the scrambling phases are from a gradient algorithm. The simulation results verify the rationality and validity of the phase scrambling.展开更多
A correlation overlapping partial transmit sequence(C-OPTS) algorithm is proposed to solve the issue of high complexity of overlapping partial transmit sequence(OPTS) algorithm in suppressing the peak to average power...A correlation overlapping partial transmit sequence(C-OPTS) algorithm is proposed to solve the issue of high complexity of overlapping partial transmit sequence(OPTS) algorithm in suppressing the peak to average power ratio(PAPR) of filter bank multicarrier-offset quadrature amplitude modulation(FBMC-OQAM) signals.The V subblocks in partial transmit sequence(PTS) are regrouped into U combinations according to the correlation coefficient p,and overlapping subblocks are allowed between adjacent groups.The search starts from the first group and sets the phase factors of the subsequent groups to 1.When the phase factors of the non-overlapping subblocks in the first group are determined,the subsequent groups are searched in turn to determine their respective phase factors.Starting from the second data block,the data overlapped with it should be taken into account when determining its optimal phase factor vector.Theoretical analysis and simulation results indicate that compared with the OPTS algorithm,the proposed algorithm can significantly reduce the computational complexity at the cost of slight deterioration of PAPR performance.Meanwhile,compared with the even-odd iterative double-layers OPTS(ID-OPTS) algorithm,it can further reduce the complexity and obtain a better PAPR suppression effect.展开更多
选择映射(selected mapping,SLM)技术是一种无失真降低OFDM(orthogonal frequency divisionmultiplexing)信号峰均比PAPR(peak-to-average power ratio)的有效方法.但是普通的SLM技术因为相位序列边带信息的传输而导致了数据传输速率的...选择映射(selected mapping,SLM)技术是一种无失真降低OFDM(orthogonal frequency divisionmultiplexing)信号峰均比PAPR(peak-to-average power ratio)的有效方法.但是普通的SLM技术因为相位序列边带信息的传输而导致了数据传输速率的损失.因此提出了一种改进的SLM技术来降低OFDM信号的PAPR,它把相位序列信息嵌入在编码后的OFDM数据块的检测符号上,避免了系统特意传输边带信息而造成的数据传输速率的损失.Matlab仿真结果表明,所提出的改进SLM技术可以在不过分增加系统复杂性的基础上,获得比普通的SLM技术更好地降低PAPR的性能.展开更多
本文针对幅度预矫正技术在降低OFDM系统PAPR(peak-to-average power ratio)的同时增加了系统平均功率的缺点,采用对部分输入符号进行两个相反方向的放大和缩小,以达到进一步降低系统PAPR,并且降低系统平均功率的目的。分析及仿真结果表...本文针对幅度预矫正技术在降低OFDM系统PAPR(peak-to-average power ratio)的同时增加了系统平均功率的缺点,采用对部分输入符号进行两个相反方向的放大和缩小,以达到进一步降低系统PAPR,并且降低系统平均功率的目的。分析及仿真结果表明,在保证系统在AWGN信道中的误比特率性能的前提下,在概率为10^(-4)处,改进后的方法比原方法PAPR降低了0.6dB,系统平均功率也有明显降低。本文方法具有算法简单、不产生失真,不发送边带信息及灵活性高,且易于与其他降低PAPR技术结合使用等特点,具有较好的实用价值。展开更多
基金supported in part by the National Science Foundation of China under Grant number 61471090the National HighTech R&D Program of China under Grant number 2014AA01A707+1 种基金the Fundamental Research Funds for the Central Universities(No.ZYGX2013J112)the Foundation Project of National Key Laboratory of Science and Technology on Communications under Grant 9140C020108140C02005
文摘High peak-to-average-power ratio(PAPR) and spectral leakage are two main drawbacks of multicarrier systems, such as in orthogonal frequency division multiplexing(OFDM), in future 5G wireless communications. For generating optimized wave forms for 5G communications, this paper proposes an iterative scheme combining time-domain N-continuous OFDM(TD-NC-OFDM) and serial peak cancellation(SPC). Based on the theory of projection onto convex sets(POCS), the effectiveness of the proposed scheme is proved, and the optimized time-frequency domain multicarrier waveforms are analyzed in terms of a balanced tradeoff between out-of-band spectral leakage and PAPR. Both theoretical analysis and simulation results show that the proposed scheme can jointly optimize both the PAPR and out-ofband radiation, with moderate computational complexity.
文摘The complex-valued modulating vectors for the subcarriers consist of two kinds of components: One is the information-bearing components superposed with pseudo-randomized phases and the other is the suppression components with specified scrambling phases. The pseudo randomized phases are generated according to the predefined polynomial and mapping function whereas the scrambling phases are from a gradient algorithm. The simulation results verify the rationality and validity of the phase scrambling.
基金Supported by the National Natural Science Foundation of China(No.61601296,61701295,61801286)the Major Scientific and Technological Innovation Projects in Chengdu(No.2019-YF08-00082-GX)the Talent Program of Shanghai University of Engineering Science(No.2018RC43)。
文摘A correlation overlapping partial transmit sequence(C-OPTS) algorithm is proposed to solve the issue of high complexity of overlapping partial transmit sequence(OPTS) algorithm in suppressing the peak to average power ratio(PAPR) of filter bank multicarrier-offset quadrature amplitude modulation(FBMC-OQAM) signals.The V subblocks in partial transmit sequence(PTS) are regrouped into U combinations according to the correlation coefficient p,and overlapping subblocks are allowed between adjacent groups.The search starts from the first group and sets the phase factors of the subsequent groups to 1.When the phase factors of the non-overlapping subblocks in the first group are determined,the subsequent groups are searched in turn to determine their respective phase factors.Starting from the second data block,the data overlapped with it should be taken into account when determining its optimal phase factor vector.Theoretical analysis and simulation results indicate that compared with the OPTS algorithm,the proposed algorithm can significantly reduce the computational complexity at the cost of slight deterioration of PAPR performance.Meanwhile,compared with the even-odd iterative double-layers OPTS(ID-OPTS) algorithm,it can further reduce the complexity and obtain a better PAPR suppression effect.
文摘选择映射(selected mapping,SLM)技术是一种无失真降低OFDM(orthogonal frequency divisionmultiplexing)信号峰均比PAPR(peak-to-average power ratio)的有效方法.但是普通的SLM技术因为相位序列边带信息的传输而导致了数据传输速率的损失.因此提出了一种改进的SLM技术来降低OFDM信号的PAPR,它把相位序列信息嵌入在编码后的OFDM数据块的检测符号上,避免了系统特意传输边带信息而造成的数据传输速率的损失.Matlab仿真结果表明,所提出的改进SLM技术可以在不过分增加系统复杂性的基础上,获得比普通的SLM技术更好地降低PAPR的性能.
文摘提出了一种新的降低峰均功率比(Peak-to-average ratio,PAPR)的方法——星座恢复法。在发送端采用软件削波限幅的方法来降低系统的峰均比,其系统结构简单、且可根据系统的要求灵活地改变PAPR值;在接收端根据调制信号的星座特性恢复出被限幅数据的实际值,从而减小了信号的畸变,提高了系统的误码性能。为了使星座恢复法更具实用性,对其算法进行了简化,从而大大地减少了系统的运算量。理论分析和仿真结果表明:与选择性映射法(Selective mapping,SLM)相比,基于星座恢复法的正交频分复用(Orthogonal frequency divisionmultiplexing,OFDM)系统,其误码性能得到了明显的改善,算法较简单,且无需额外信道来传送附加信息。
文摘本文针对幅度预矫正技术在降低OFDM系统PAPR(peak-to-average power ratio)的同时增加了系统平均功率的缺点,采用对部分输入符号进行两个相反方向的放大和缩小,以达到进一步降低系统PAPR,并且降低系统平均功率的目的。分析及仿真结果表明,在保证系统在AWGN信道中的误比特率性能的前提下,在概率为10^(-4)处,改进后的方法比原方法PAPR降低了0.6dB,系统平均功率也有明显降低。本文方法具有算法简单、不产生失真,不发送边带信息及灵活性高,且易于与其他降低PAPR技术结合使用等特点,具有较好的实用价值。
