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首页> 外文期刊>Physical Communication >Modified switching DE algorithm to facilitate reduction of PAPR in OFDM systems
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Modified switching DE algorithm to facilitate reduction of PAPR in OFDM systems

机译：修改后的交换DE算法有助于降低OFDM系统中的PAPR

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摘要

Partial Transmit Sequence (PTS) currently can be regarded as an extremely attractive and popular method which allows the achievement of very good Peak to Average Power Ratio (PAPR) reduction for signals that have undergone Orthogonal Frequency Division Multiplexing (OFDM), while also is being a technique which does not distort the signals being processed. In this method, a comprehensive search is conducted taking into account all possible combinations of phase-factors that can occur, leading to an increasing complexity of computation with respect to increasing in sub-blocks. The current paper outlines a novel low complexity sub-optimal PTS technique with its basis in an altered implementation of Differential Evolution (DE) algorithm shortly MBLX-DE which significantly diminishes the PAPR of OFDM signals. More specifically SWDE_Sucess_MBLX (Switched parameter Differential Evolution with success based mutation and modified blending crossover) algorithm (Ghosh et al., 2017) is modified in an efficient way and has been implemented for the PTS scheme. The proposed algorithm introduces modifications in three stages of SWDE_Sucess_MBLX like population central tendency based mutation scheme is incorporated along with the success based mutation, a random selection between two cross-over strategies with blending rate concept and threshold-based selection. A theoretical performance study with general formulas of the proposed scheme is presented and a comparative analysis is done with existing algorithms. Extensive simulation results demonstrate that our proposed method can substantially outperform against the currently best-known algorithms in the context of reduction of PAPR as well as performance in terms of complexity of the computations to be performed.
机译：目前，部分传输序列（PTS）被认为是一种极具吸引力和流行的方法，它允许对经历了正交频分复用（OFDM）的信号实现非常好的峰均功率比（PAPR）降低，一种不会使正在处理的信号失真的技术。在这种方法中，考虑到可能发生的相位因素的所有可能组合来进行全面搜索，导致子块增加导致计算复杂性增加。本文概述了一种新颖的低复杂度次优PTS技术，其基础是不久之后的MBLX-DE差分演化（DE）算法的变更实现，该算法大大降低了OFDM信号的PAPR。更具体地说，SWDE_Sucess_MBLX（具有基于成功的突变和改进的混合交叉的切换参数差分进化）算法（Ghosh等人，2017）以一种有效的方式进行了修改，并已针对PTS方案实施。所提出的算法在SWDE_Sucess_MBLX的三个阶段引入了修改，例如结合了基于人口集中趋势的突变方案以及基于成功的突变，具有混合速率概念的两个交叉策略和基于阈值的选择之间的随机选择。对该方案的一般公式进行了理论性能研究，并对现有算法进行了比较分析。大量的仿真结果表明，在降低PAPR以及性能方面，我们提出的方法可以大大优于目前最著名的算法。

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