The Effects of Multipath on the Performance of High Rate Digital QAM and OFDM Wireless Link Operating in Tunnels

IF 3.4 3区计算机科学 Q2 COMPUTER SCIENCE, INFORMATION SYSTEMS IEEE Access Pub Date : 2025-01-13 DOI:10.1109/ACCESS.2025.3528645

Yehuda Taragin;Niv Elkayam;Gad A. Pinhasi;Yosef Pinhasi

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Abstract

Wide-band wireless communication in tunnels and long corridors faces challenges due to multipath interferences and delay spread. Wall reflections induce dispersion, causing amplitude and phase distortions in the received signal, with the extent of distortion determined by multiple factors. Accurate modeling of space-frequency effects is essential for designing reliable indoor wireless links. This study presents an experimentally validated, precise, and versatile model for the propagation of modulated wireless signals in tunnels. Quasi-optical, multi-ray model is employed to derive the transfer function, describing the indoor propagation in the frequency domain. The model enables analysis of the impact of changes among other in modulations, frequencies, and different bandwidths. The results include a comprehensive comparison of various cases for Bit Error Rate (BER), Error Vector Magnitude (EVM), constellations, and facilitating a thorough examination of the tunnel effects in each scenario. Several representative results are presented in the paper. Notably, a significant correlation is observed between the bandwidth used and an increase in BER. Furthermore, the comparison between Orthogonal Frequency Division Multiplexing (OFDM) and Quadrature Amplitude Modulation (QAM) reveals a distinct preference for OFDM due to its ability to overcome the frequency-selective fading nature of the tunnel.

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隧道中多径对高速数字QAM和OFDM无线链路运行性能的影响

隧道和长走廊的宽带无线通信面临着多径干扰和延迟传播的挑战。壁面反射引起色散，在接收信号中引起幅度和相位畸变，畸变的程度由多种因素决定。准确的空频效应建模对于设计可靠的室内无线链路至关重要。本研究提出了一个经过实验验证的、精确的、通用的调制无线信号在隧道中的传播模型。采用准光学多射线模型推导传递函数，在频域上描述了室内传播。该模型能够分析调制、频率和不同带宽之间变化的影响。结果包括对各种情况下的误码率（BER）、误差矢量大小（EVM）、星座进行全面比较，并促进对每种情况下隧道效应的彻底检查。文中给出了几个有代表性的结果。值得注意的是，在使用的带宽和BER的增加之间观察到显著的相关性。此外，正交频分复用（OFDM）和正交调幅（QAM）之间的比较揭示了OFDM的明显偏好，因为它能够克服隧道的频率选择性衰落特性。

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来源期刊

IEEE Access COMPUTER SCIENCE, INFORMATION SYSTEMSENGIN-ENGINEERING, ELECTRICAL & ELECTRONIC

CiteScore

9.80

自引率

7.70%

发文量

6673

审稿时长

6 weeks

期刊介绍： IEEE Access® is a multidisciplinary, open access (OA), applications-oriented, all-electronic archival journal that continuously presents the results of original research or development across all of IEEE''s fields of interest. IEEE Access will publish articles that are of high interest to readers, original, technically correct, and clearly presented. Supported by author publication charges (APC), its hallmarks are a rapid peer review and publication process with open access to all readers. Unlike IEEE''s traditional Transactions or Journals, reviews are "binary", in that reviewers will either Accept or Reject an article in the form it is submitted in order to achieve rapid turnaround. Especially encouraged are submissions on: Multidisciplinary topics, or applications-oriented articles and negative results that do not fit within the scope of IEEE''s traditional journals. Practical articles discussing new experiments or measurement techniques, interesting solutions to engineering. Development of new or improved fabrication or manufacturing techniques. Reviews or survey articles of new or evolving fields oriented to assist others in understanding the new area.