Overcoming constructive/destructive interference in diversity transmission via Alamouti coding

IF 6.3 2区计算机科学 Q1 TELECOMMUNICATIONS

Digital Communications and Networks Pub Date : 2026-08-01 Epub Date: 2026-04-09 DOI:10.1016/j.dcan.2026.04.002

Jiali Chen, Ye Zhou, Qinyi Zhang, Mingxu Wang, Xin Lu, Hansong Ma, Ying Wu, Qiutong Zhang, Jianyu Long, Weiping Li, Wen Zhou, Kaihui Wang, Jianjun Yu

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引用次数: 0

Abstract

We propose a novel Alamouti-Orthogonal Frequency Division Multiplexing (OFDM) system that mitigates constructive and destructive interference in practical multi-antenna wireless communications. The key innovation lies in directly applying Alamouti coding at the OFDM subcarrier level. By harnessing the inherent orthogonality and frequency-domain properties of OFDM subcarriers, our system fundamentally mitigates the constructive/destructive interference caused by propagation path-delay differences between transmit antennas. By discovering and leveraging the inherent properties of OFDM subcarriers and combined with the full diversity gain and inter-carrier orthogonality enabled by Alamouti coding, our system simultaneously achieves diversity gain while overcoming unavoidable multi-signal time delays inherent in diversity transmissions. Experimental results across multiple scenarios demonstrate that, under spatial misalignment, the Alamouti-OFDM system provides a maximum Signal-to-Noise Ratio (SNR) gain of 3.45 dB over traditional diversity transmission systems; in scenarios where traditional methods exhibit  > 10 dB spectral fluctuations, our system confines the spectral variations of the received signals within 2 dB.

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利用Alamouti编码克服分集传输中的建设性/破坏性干扰

本文提出了一种新型的正交频分复用（OFDM）系统，以减轻实际多天线无线通信中的建设性和破坏性干扰。关键的创新在于直接在OFDM子载波级应用Alamouti编码。通过利用OFDM子载波固有的正交性和频域特性，我们的系统从根本上减轻了由发射天线之间的传播路径延迟差异引起的建设性/破坏性干扰。通过发现和利用OFDM子载波的固有特性，并结合Alamouti编码实现的全分集增益和载波间正交性，我们的系统在克服分集传输中不可避免的多信号时间延迟的同时实现了分集增益。多种场景下的实验结果表明，在空间失调情况下，Alamouti-OFDM系统比传统分集传输系统提供了3.45 dB的最大信噪比增益；在传统方法表现出 >； 10db频谱波动的情况下，我们的系统将接收信号的频谱变化限制在2db以内。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Digital Communications and Networks Computer Science-Hardware and Architecture

CiteScore

12.80

自引率

5.10%

发文量

915

审稿时长

30 weeks

期刊介绍： Digital Communications and Networks is a prestigious journal that emphasizes on communication systems and networks. We publish only top-notch original articles and authoritative reviews, which undergo rigorous peer-review. We are proud to announce that all our articles are fully Open Access and can be accessed on ScienceDirect. Our journal is recognized and indexed by eminent databases such as the Science Citation Index Expanded (SCIE) and Scopus. In addition to regular articles, we may also consider exceptional conference papers that have been significantly expanded. Furthermore, we periodically release special issues that focus on specific aspects of the field. In conclusion, Digital Communications and Networks is a leading journal that guarantees exceptional quality and accessibility for researchers and scholars in the field of communication systems and networks.