A new pilot assignment scheme for mitigating pilot contamination in uplink massive multi-input–multi-output (MIMO) systems

IF 2.3 4区计算机科学 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC EURASIP Journal on Wireless Communications and Networking Pub Date : 2024-01-04 DOI:10.1186/s13638-023-02329-1

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Abstract

Pilot contamination is a serious issue in massive multi–input–multi–output systems which significantly degrades system performance. In this paper, we investigate a new pilot assignment scheme by integrating two-dimensional genetic algorithm with Tabu-Search algorithm (TS) to mitigate the pilot contamination problem. Firstly, we design a two-dimensional genetic algorithm equipped with elitism strategy as a principal algorithm for solving the pilot assignment problem; then, aiming to enhance the convergence speed of the genetic algorithm to the ideal optimal solution, we integrate TS with the genetic algorithm. This integrated pilot assignment scheme, henceforth designated as GATS-PA, is found to be powerful in mitigating the pilot contamination problem. Numerical simulation results verify that the proposed pilot assignment scheme is very close to the ideal optimal solution with few numbers of iterations and outperforms existing methods in terms of enhancing the average uplink rate per user over a wide range of simulation parameters.

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用于减轻上行链路大规模多输入多输出 (MIMO) 系统中先导污染的新先导分配方案

摘要在大规模多输入多输出系统中，先导污染是一个严重的问题，它会显著降低系统性能。本文通过将二维遗传算法与塔布搜索算法（Tabu-Search algorithm，TS）相结合，研究了一种新的先导分配方案，以缓解先导污染问题。首先，我们设计了一种配备精英策略的二维遗传算法，作为解决先导分配问题的主要算法；然后，为了提高遗传算法向理想最优解收敛的速度，我们将塔布搜索算法与遗传算法进行了整合。这种集成的先导分配方案（以下简称为 GATS-PA）被认为能有效缓解先导污染问题。数值模拟结果验证了所提出的先导分配方案只需很少的迭代次数就能非常接近理想的最优解，并且在很大的模拟参数范围内，在提高每个用户的平均上行链路速率方面优于现有方法。

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来源期刊

EURASIP Journal on Wireless Communications and Networking 工程技术-电信学

CiteScore

7.70

自引率

3.80%

发文量

109

审稿时长

8.0 months

期刊介绍： The overall aim of the EURASIP Journal on Wireless Communications and Networking (EURASIP JWCN) is to bring together science and applications of wireless communications and networking technologies with emphasis on signal processing techniques and tools. It is directed at both practicing engineers and academic researchers. EURASIP Journal on Wireless Communications and Networking will highlight the continued growth and new challenges in wireless technology, for both application development and basic research. Articles should emphasize original results relating to the theory and/or applications of wireless communications and networking. Review articles, especially those emphasizing multidisciplinary views of communications and networking, are also welcome. EURASIP Journal on Wireless Communications and Networking employs a paperless, electronic submission and evaluation system to promote a rapid turnaround in the peer-review process. The journal is an Open Access journal since 2004.