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M. Zaisberger, H. Arthaber:
"Random Access Performance Evaluation and Improvements of the LDACS";
Vortrag: ICTCE 2020 - The 4th International Conference on Telecommunications and Communication Engineering, Singapur; 04.12.2020 - 06.12.2020; in: "2020 The 4th International Conference on Telecommunications and Communication Engineering", Lecture Notes in Electrical Engineering / Springer Verlag, (2020), ISSN: 1876-1100; 10 S.

This paper focus on the registration of an aircraft to the L-Band Digital Aeronautical Communication System (LDACS). For this purpose, an Aircraft Station (AS) according to the LDACS standard[1] transmits an Random Access (RA) frame via one of two RA slots to an LDACS Ground Station (GS). Registration of an AS is typically required for two scenarios. One case is that an AS turns on its radio at the airport near to a GS, which corresponds to a high Signal-to-Noise Ratio (SNR) scenario, but very likely non line-of-sight (NLOS) due to the airport infrastructure. The other case is the registration at the cellborder which conforms to a low SNR but line-of-sight (LOS) scenario. For the detection of RA frames within the RA channel, different detection methods are compared with each other via simulations. Furthermore, the necessary accuracy of the Doppler estimation to achieve a certain Bit Error Rate (BER) is determined and possible improvements of the RA frame are discussed.

aeronautical communication system, synchronization, Doppler, LDACS, Random Access