Hybrid-Domain Evaluation PTS with Adaptive Selection Methods for PAPR Reduction

Energies

Jingting Xiao¹  Guoting Zhang¹  Zhiping Xia¹  Libiao Jin²  Jianbo Liu²  Yuan Lu²  Feng Hu² 

[1] Academy of Broadcasting Science, Beijing 100045, China;School of Information and Communication Engineering, Communication University of China, Beijing 100024, China;

关键词: multicarrier system;    5G communication;    partial transmission sequence;    OFDM;    power amplifier efficiency;    PAPR;   

DOI  :  10.3390/en15082738

来源: DOAJ

【 摘 要 】

The partial transmit sequence (PTS) technique is a fairly suitable scheme to mitigate the high peak-to-average power ratio (PAPR) problem inherent in 5G multicarrier systems, especially considering a high-order QAM modulation design. However, the high computational complexity level and the speed of the convergence for optimizing the phases of the transmitting signal restrict this technique in practical applications. In this paper, a low-complexity frequency-domain-evaluated PTS (F-PTS) based on a spacing multiobjective (SMO) processing algorithm is proposed to reduce the PAPR values. The PAPR performance are accurately predicted in terms of modifying relative dispersion in the frequency domain. As a result, the complexity of searching the optimal phase factors and IFFT computing is simplified. Moreover, a frequency-domain- and time-domain-evaluating PTS (FTD-PTS) is employed to search the optimal solution with a reasonable complexity. Simulation results verify that the operation rate of F-PTS is significantly improved after transferring the exhaustive search strategy of PTS into the SMO algorithm, and the F-PTS PAPR reduction performance is just 0.3 dB away from theoretical optimal performance. The FTD-PTS spends an acceptable operation rate to obtain optimal PAPR reduction performance, which subtracts 0.5 and 0.6 dB more than PSO-PTS and conventional PTS at $CCDF={10}^{-3}$, respectively.

【 授权许可】

Unknown