Mitigation of DME interference in LDACS1-based future air-to-ground (A/G) communications

Raja Muthalagu

doi:10.1080/23311916.2018.1472199

Abstract

In this article, an algorithm for mitigating distance measuring equipment (DME) interference in L-band digital aeronautical communication system type 1 (LDACS1)-based aeronautical communication sys...

Highlights

Over the past two decades, the air transport industry has experienced continuous growth and the demand for passenger air traffic is forecast to double the current level by about 2025 (EUROCONTROL, 2008)
The total interference signal IDMEðtÞ at L-band digital aeronautical communication system (LDACS) type 1 (LDACS1) system in a certain time interval t is composed of the contribution from NDME distance measuring equipment (DME) stations that are operating on the Æ 0: 5MHz offset to the centre frequency of the LDACS1 system
The orthogonal frequency-division multiplexing (OFDM) system parameters used for all the simulations are reported in Table II The threshold value used in pulse blanking, pulse clipping (PC) and directed noise estimation (DDNE) is normalized to the average power of the received LDACS1 signal

Summary

Introduction

Over the past two decades, the air transport industry has experienced continuous growth and the demand for passenger air traffic is forecast to double the current level by about 2025 (EUROCONTROL, 2008). DME is the radio navigation technology, which measures the slant distance between the aircraft, and the ground station (GS) operates in the UHF frequency spectrum between 960−1164 MHz. Various possible interference scenarios between LDACS1 and DME for both co-site and co-channel environments are analyzed in (Gligorevic et al, 2011). To create the DME interference signal corresponding to the LDACS1 system, the baseband DME pulse pairs are modulated to the relative carrier frequency of the channel to 0.5 MHz left and to the 0.5 MHz right of the LDACS1 system bandwidth. The total interference signal IDMEðtÞ at LDACS1 system in a certain time interval t is composed of the contribution from NDME DME stations that are operating on the Æ 0: 5MHz offset to the centre frequency of the LDACS1 system. P1⁄40 where rðtÞ- channel output, uðtÞ- channel input, transmitted signal, P- total number of scattered paths and μpðtÞ- fading behaviour of pth path, which is a complex Gaussian process

Conventional and proposed interference mitigation methods

Conclusion and future works