In this paper, a new partial transmit sequence（PTS）scheme with low computational complexity is proposed for the problems of high computational complexity in the conventional PTS method. By analyzing the relationship...In this paper, a new partial transmit sequence（PTS）scheme with low computational complexity is proposed for the problems of high computational complexity in the conventional PTS method. By analyzing the relationship of candidate sequences in the PTS method under the interleaved partition method, it has been discovered that some candidate sequences generated by phase factor sequences have the same peak average power ratio（PAPR）. Hence, phase factor sequences can be optimized to reduce their searching times. Then, the computational process of generating candidate sequences can be simplified by improving the utilization of data and minimizing the calculations of complex multiplication. The performance analysis shows that, compared with the conventional PTS scheme, the proposed approach significantly decreases the computational complexity and has no loss of PAPR performance.展开更多
针对滤波器组多载波-偏移正交幅度调制技术(Filter Bank Multicarrier-Offset Quadrature Amplitude Modulation,FBMC-OQAM)存在峰均功率比(Peak-to-Average Power Ratio,PAPR)过高的问题,以及传统部分传输序列(Partial Transfer Sequen...针对滤波器组多载波-偏移正交幅度调制技术(Filter Bank Multicarrier-Offset Quadrature Amplitude Modulation,FBMC-OQAM)存在峰均功率比(Peak-to-Average Power Ratio,PAPR)过高的问题,以及传统部分传输序列(Partial Transfer Sequence,PTS)算法对PAPR抑制效果不明显,提出了一种新的基于自适应搜索策略的人工蜂群部分传输序列算法(Adaptive Search Strategy Based Artifical Bee Colony PTS,ASSABC-PTS)。首先,根据FBMC-OQAM系统特性,利用传统PTS算法对系统进行初步优化,以降低FBMC-OQAM系统的PAPR;然后,针对PTS算法中存在的计算复杂度问题,引入人工蜂群(Artificial Bee Colony,ABC)算法进行优化;最后,在ABC算法中引入自适应搜索策略提升算法的局部寻优能力,加快ABC算法的收敛速度和搜索精度。仿真实验表明,ASSABC-PTS在有效降低系统算法复杂度的同时,也极大降低了FBMC-OQAM系统的峰均功率比。展开更多
Partial transmit sequence (PTS) is a promising technique for peak-to-average power ratio (PAPR) re-duction in orthogonal frequency division multiplexing (OFDM). While in optimal PTS, an exhaustive search for all combi...Partial transmit sequence (PTS) is a promising technique for peak-to-average power ratio (PAPR) re-duction in orthogonal frequency division multiplexing (OFDM). While in optimal PTS, an exhaustive search for all combinations of phase factor sequences is required, this results in huge computation. In this paper, by introducing the orthogonal design, a phase factor sequences algorithm is proposed. The algorithm uses orthogonal table to gen-erate phase factor sequences, and the regular PAPR computation result is then followed by the parameter estima-tion. The simulation result shows that the proposed algorithm reduces the computation notably and obtains a good PAPR performance approaching the optimal PTS.展开更多
To obtain good trade-offs between complexity and performance onpeak-to-average power ratio (PAPR) reduction in orthogonal frequency division multiplexing (OFDM)using partial transmitting sequence (PTS) schemes, a trel...To obtain good trade-offs between complexity and performance onpeak-to-average power ratio (PAPR) reduction in orthogonal frequency division multiplexing (OFDM)using partial transmitting sequence (PTS) schemes, a trellis structure based PTS factor searchmethod is proposed. The trellis search is with a variant constraint length L_C, 1 ≤ L_C ≤ V-1,where V is the number of PTS subblocks. The method is to decide a PTS factor by searching all thepossible paths obtained by varying L_C consecutive factors. The trellis search can be viewed as ageneral PTS factor search model. If L_C = V-1, it is a full search, and if L_C = 1, it is aniterative search. Using different constraint lengths, trellis factor search PTS exhibits differentPAPR reduction performances. A larger L_C results in a better performance and L_C = V-1 results inthe optimum. However, a larger L_C requires more computation. This helps to choose a good trade-offbetween complexity and performance.展开更多
为了降低多输入多输出正交频分复用(multiple input multiple output orthogonal frequency division multiplexing,MIMO-OFDM)系统中传统部分传输序列(partial transmit sequence,PTS)算法的计算复杂度,提出了联合时域和空间域信号处...为了降低多输入多输出正交频分复用(multiple input multiple output orthogonal frequency division multiplexing,MIMO-OFDM)系统中传统部分传输序列(partial transmit sequence,PTS)算法的计算复杂度,提出了联合时域和空间域信号处理的改进PTS算法。在时域信号处理部分,通过信号子块循环移位实现备选序列的增加;在空间域部分,利用天线间信号子块交换实现峰均功率比(peak to average power ratio,PAPR)抑制。同时在接收端,利用子块相位旋转引起的相位差异,本方法通过比较接收信号与星座点的距离,可以实现信号的盲检测,从而有效提高MIMO-OFDM系统的频谱利用率。仿真结果表明,提出的方法能有效地抑制MIMO-OFDM信号的PAPR,而且明显降低了传统PTS算法的计算复杂度,同时可获得跟传统PTS方法已知边带副信息时相似的比特误码率(bit error rate,BER)性能。展开更多
为了降低正交频分复用(orthogonal frequency division multiplexing,OFDM)信号的峰均功率比(peak to average power ratio,PAPR),提高系统的误比特率(bit error rate,BER)性能,提出了一种结合时域信号分割和部分子块循环移位的低复杂...为了降低正交频分复用(orthogonal frequency division multiplexing,OFDM)信号的峰均功率比(peak to average power ratio,PAPR),提高系统的误比特率(bit error rate,BER)性能,提出了一种结合时域信号分割和部分子块循环移位的低复杂度部分传输序列(partial transmit sequence,PTS)算法,发送端仅需要一次快速傅里叶反变换(inverse fast fourier transform,IFFT)运算即可获得多个备选序列,接收端通过比较反向旋转序列与最近星座点的距离来恢复时域循环因子,实现了信号的盲检测。采用了两种不同的最佳序列选择准则:最小PAPR和最大相关性准则(cross correlation,CORR),并仿真分析了系统的PAPR性能和BER性能。结果表明,所提算法有效地抑制了OFDM信号的PAPR,提高了系统的BER性能,与传统PTS和选择性映射算法相比,明显降低了计算复杂度。展开更多
基金supported by the National Natural Science Foundation of China(6167309361370152)the Science and Technology Project of Shenyang(F16-205-1-01)
文摘In this paper, a new partial transmit sequence（PTS）scheme with low computational complexity is proposed for the problems of high computational complexity in the conventional PTS method. By analyzing the relationship of candidate sequences in the PTS method under the interleaved partition method, it has been discovered that some candidate sequences generated by phase factor sequences have the same peak average power ratio（PAPR）. Hence, phase factor sequences can be optimized to reduce their searching times. Then, the computational process of generating candidate sequences can be simplified by improving the utilization of data and minimizing the calculations of complex multiplication. The performance analysis shows that, compared with the conventional PTS scheme, the proposed approach significantly decreases the computational complexity and has no loss of PAPR performance.
文摘针对滤波器组多载波-偏移正交幅度调制技术(Filter Bank Multicarrier-Offset Quadrature Amplitude Modulation,FBMC-OQAM)存在峰均功率比(Peak-to-Average Power Ratio,PAPR)过高的问题,以及传统部分传输序列(Partial Transfer Sequence,PTS)算法对PAPR抑制效果不明显,提出了一种新的基于自适应搜索策略的人工蜂群部分传输序列算法(Adaptive Search Strategy Based Artifical Bee Colony PTS,ASSABC-PTS)。首先,根据FBMC-OQAM系统特性,利用传统PTS算法对系统进行初步优化,以降低FBMC-OQAM系统的PAPR;然后,针对PTS算法中存在的计算复杂度问题,引入人工蜂群(Artificial Bee Colony,ABC)算法进行优化;最后,在ABC算法中引入自适应搜索策略提升算法的局部寻优能力,加快ABC算法的收敛速度和搜索精度。仿真实验表明,ASSABC-PTS在有效降低系统算法复杂度的同时,也极大降低了FBMC-OQAM系统的峰均功率比。
基金Supported by Tianjin Natural Science Foundation (No. 043600611)Key Scientific and Technological Training Program of Tianjin (No. 043102911).
文摘Partial transmit sequence (PTS) is a promising technique for peak-to-average power ratio (PAPR) re-duction in orthogonal frequency division multiplexing (OFDM). While in optimal PTS, an exhaustive search for all combinations of phase factor sequences is required, this results in huge computation. In this paper, by introducing the orthogonal design, a phase factor sequences algorithm is proposed. The algorithm uses orthogonal table to gen-erate phase factor sequences, and the regular PAPR computation result is then followed by the parameter estima-tion. The simulation result shows that the proposed algorithm reduces the computation notably and obtains a good PAPR performance approaching the optimal PTS.
文摘To obtain good trade-offs between complexity and performance onpeak-to-average power ratio (PAPR) reduction in orthogonal frequency division multiplexing (OFDM)using partial transmitting sequence (PTS) schemes, a trellis structure based PTS factor searchmethod is proposed. The trellis search is with a variant constraint length L_C, 1 ≤ L_C ≤ V-1,where V is the number of PTS subblocks. The method is to decide a PTS factor by searching all thepossible paths obtained by varying L_C consecutive factors. The trellis search can be viewed as ageneral PTS factor search model. If L_C = V-1, it is a full search, and if L_C = 1, it is aniterative search. Using different constraint lengths, trellis factor search PTS exhibits differentPAPR reduction performances. A larger L_C results in a better performance and L_C = V-1 results inthe optimum. However, a larger L_C requires more computation. This helps to choose a good trade-offbetween complexity and performance.
文摘为了降低多输入多输出正交频分复用(multiple input multiple output orthogonal frequency division multiplexing,MIMO-OFDM)系统中传统部分传输序列(partial transmit sequence,PTS)算法的计算复杂度,提出了联合时域和空间域信号处理的改进PTS算法。在时域信号处理部分,通过信号子块循环移位实现备选序列的增加;在空间域部分,利用天线间信号子块交换实现峰均功率比(peak to average power ratio,PAPR)抑制。同时在接收端,利用子块相位旋转引起的相位差异,本方法通过比较接收信号与星座点的距离,可以实现信号的盲检测,从而有效提高MIMO-OFDM系统的频谱利用率。仿真结果表明,提出的方法能有效地抑制MIMO-OFDM信号的PAPR,而且明显降低了传统PTS算法的计算复杂度,同时可获得跟传统PTS方法已知边带副信息时相似的比特误码率(bit error rate,BER)性能。
文摘为了降低正交频分复用(orthogonal frequency division multiplexing,OFDM)信号的峰均功率比(peak to average power ratio,PAPR),提高系统的误比特率(bit error rate,BER)性能,提出了一种结合时域信号分割和部分子块循环移位的低复杂度部分传输序列(partial transmit sequence,PTS)算法,发送端仅需要一次快速傅里叶反变换(inverse fast fourier transform,IFFT)运算即可获得多个备选序列,接收端通过比较反向旋转序列与最近星座点的距离来恢复时域循环因子,实现了信号的盲检测。采用了两种不同的最佳序列选择准则:最小PAPR和最大相关性准则(cross correlation,CORR),并仿真分析了系统的PAPR性能和BER性能。结果表明,所提算法有效地抑制了OFDM信号的PAPR,提高了系统的BER性能,与传统PTS和选择性映射算法相比,明显降低了计算复杂度。
