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Article

A Simple and Robust Equalization Algorithm for Variable Modulation Systems

by 1,2, 1,*, 1,2 and 1,2
1
Key Laboratory of Electronics and Information Technology for Space System, National Space Science Center, Chinese Academy of Sciences, Beijing 100190, China
2
School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
*
Author to whom correspondence should be addressed.
Academic Editor: Ray E. Sheriff
Electronics 2021, 10(20), 2496; https://doi.org/10.3390/electronics10202496
Received: 30 August 2021 / Revised: 4 October 2021 / Accepted: 9 October 2021 / Published: 14 October 2021
(This article belongs to the Special Issue 5G and beyond Mobile and Satellite Communications)
This paper proposes a simple and robust variable modulation-decision-directed least mean square (VM-DDLMS) algorithm for reducing the complexity of conventional equalization algorithms and improving the stability of variable modulation (VM) systems. Compared to conventional adaptive equalization algorithms, known information was used as training sequences to reduce the bandwidth consumption caused by inserting training sequences; compared with conventional blind equalization algorithms, the parameters and decisions of the equalizer were determinate, which was conducive to a stable equalization performance. The simulation and implementation results show that the proposed algorithm has a better bit error rate (BER) performance than that of the constant modulus algorithm (CMA) and modified constant modulus algorithm (MCMA) while maintaining the same level of consumption of hardware resources. Compared to the conventional decision-directed least mean square (DDLMS) algorithm, the proposed algorithm only needs to make quadrature phase shift keying (QPSK) symbol decisions, which reduces the computational complexity. In parallel 11th-order equalization algorithms, the operating frequency of VM-DDLMS can reach up to 333.33 MHz. View Full-Text
Keywords: variable modulation (VM) systems; mode switching; inter-symbol interference (ISI); data-assisted equalization algorithm; variable modulation-decision-directed least mean square (VM-DDLMS) algorithm variable modulation (VM) systems; mode switching; inter-symbol interference (ISI); data-assisted equalization algorithm; variable modulation-decision-directed least mean square (VM-DDLMS) algorithm
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MDPI and ACS Style

Hu, W.; Wang, Z.; Mei, R.; Lin, M. A Simple and Robust Equalization Algorithm for Variable Modulation Systems. Electronics 2021, 10, 2496. https://doi.org/10.3390/electronics10202496

AMA Style

Hu W, Wang Z, Mei R, Lin M. A Simple and Robust Equalization Algorithm for Variable Modulation Systems. Electronics. 2021; 10(20):2496. https://doi.org/10.3390/electronics10202496

Chicago/Turabian Style

Hu, Wanru, Zhugang Wang, Ruru Mei, and Meiyan Lin. 2021. "A Simple and Robust Equalization Algorithm for Variable Modulation Systems" Electronics 10, no. 20: 2496. https://doi.org/10.3390/electronics10202496

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