Abstract
Interference mitigation in L-band digital aeronautic communication systems from legacy users is vital due to stringent safety requirements and steady-state increase in air traffic. This paper proposes an L-band digital aeronautic communication systems receiver prototype that employs nonlinear operations to reduce the interference from the prime interference contributor distance measuring equipment. The knowledge of genie-aided estimator and optimum Bayesian estimator is utilized to propose improved and low complexity nonlinear devices, such as a genie-aided estimator enhanced pulse peak attenuator, genie-aided estimator enhanced pulse peak limiter, joint genie-aided estimator enhanced pulse peak attenuator, joint genie-aided estimator enhanced pulse peak limiter, optimum Bayesian estimator enhanced pulse peak attenuator, optimum Bayesian estimator enhanced pulse peak limiter, joint optimum Bayesian estimator enhanced pulse peak attenuator and joint optimum Bayesian estimator enhanced pulse peak limiter. The performance of the proposed methods is compared with the classical pulse blanking in terms of the received bit error rate for different signal-to-noise ratios. The proposed genie-aided estimator enhanced methods exhibited SNR saving in the range of 2 to 2.5 dB at a bit error rate of 10−1. At the same BER, the proposed optimum Bayesian estimator enhanced methods achieved SNR saving in the range of 2.5 to 3 dB.
Highlights
Accepted: 12 January 2022Aeronautical frequency spectrum loads have always been severe for aviation and are anticipated to be even more crucial with the steady increase in air traffic and the deployment of new technologies
The International Civil Aviation Organization (ICAO) recommended future communications infrastructure (FCI) to enhance the existing communication links between aircraft and ground controllers with new optimal data link protocols. This led to the development of L-band digital aeronautical communication systems (LDACS) as an inlay system between the legacy users [2] in 960–1164 MHz to face the challenge of the saturated very high frequency band (VHF) spectrum and spectrum congestion
By utilizing the design parameters of genie-aided estimator (GAE) and optimum Bayesian estimator (OBE), we propose pulse peak attenuators and pulse peak limiters, which could effectively reduce distance measuring equipment (DME) noise when compared to conventional pulse blanking methods
Summary
Aeronautical frequency spectrum loads have always been severe for aviation and are anticipated to be even more crucial with the steady increase in air traffic and the deployment of new technologies. The existing HF and VHF data links fail to provide broadband services to flight crews or in the future due to the lack of the available spectrum This situation becomes a hindrance in the employment of enhanced air traffic management (ATM) operations, such as trajectory-based operations (TBO). The International Civil Aviation Organization (ICAO) recommended future communications infrastructure (FCI) to enhance the existing communication links between aircraft and ground controllers with new optimal data link protocols This led to the development of L-band digital aeronautical communication systems (LDACS) as an inlay system between the legacy users [2] in 960–1164 MHz to face the challenge of the saturated VHF spectrum and spectrum congestion.
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