Nested code division multiple access for distance measuring equipment interference mitigation in L‐band digital aeronautical communication system,International Journal of Communication Systems

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Nested code division multiple access for distance measuring equipment interference mitigation in L‐band digital aeronautical communication system
International Journal of Communication Systems ( IF 1.7 ) Pub Date : 2021-04-11 , DOI: 10.1002/dac.4804
Emad Abd‐Elaty _{1,

2} , Abdelhalim Zekry ₁ , Salah El‐Agooz ₂ , Anwar M. Helaly ₂

Affiliation

Air‐to‐ground (A/G) communications have been transferred from the congested very high frequency (VHF) band to occupy the guard bands between adjacent distance measurement equipment (DME) navigation channels within the L‐Band. However, the inlayed channels, called L‐band digital aeronautical communication system (LDACS) channels, experience severe interference with the coexisting DME channels. In this paper, a DME interference detection and mitigation technique is proposed to improve the performance of the LDACS in the presence of DME interference. The DME energy detector based on Neyman–Pearson test is proposed, which has more advantages than the other techniques due to its noncoherent nature and simplicity. Furthermore, the proposed DME detection technique is performed by using an adaptive threshold to achieve the best trade‐off between the DME signal detection and false alarm. The proposed DME interference mitigation technique relies on the proposed concept of nested RF upconversion, where the in‐phase and the quadrature components of an LDACS signal are forwarded to a code division multiple access (CDMA) block in which they are transmitted only over the quadrature branch once DME interfering signal is detected. In this work, the closed form expression for the probability of DME detection, false alarm, and the detection error rate are derived. Simulation is performed, and the results show that the proposed technique provides improvement in the probability of DME detection and the detection error rate compared to the previous work. Also, simulation results shows that the proposed technique provides lower bit error rate and less complexity compared to the previous work.

中文翻译：

嵌套码分多址，用于减轻L波段数字航空通信系统中的测距设备干扰

空对地（A / G）通信已从拥挤的甚高频（VHF）频段转移到L频段内相邻距离测量设备（DME）导航通道之间的保护频段。但是，称为L波段数字航空通信系统（LDACS）通道的嵌入式通道会遇到对共存DME通道的严重干扰。本文提出了一种DME干扰检测和缓解技术，以在存在DME干扰的情况下提高LDACS的性能。提出了一种基于Neyman–Pearson检验的DME能量检测器，由于其非相干性和简单性，它比其他技术具有更多的优势。此外，所提出的DME检测技术是通过使用自适应阈值来实现的，以在DME信号检测与错误警报之间取得最佳平衡。拟议中的DME干扰缓解技术基于拟议中的嵌套RF上变频概念，其中LDACS信号的同相和正交分量被转发到码分多址（CDMA）块，在该块中，它们仅在正交方向上传输一旦检测到DME干扰信号，分支。在这项工作中，导出了DME检测概率，错误警报和检测错误率的闭合形式表达式。进行了仿真，结果表明，与先前的工作相比，所提出的技术在DME检测的概率和检测错误率上均有所提高。还，

更新日期：2021-05-04

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