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Catalogue : Details

Martin Hirschbeck

Interference Mitigation and Channel Estimation for Digital Aeronautical Communication Systems based on OFDM

Interferenzunterdrückung und Kanalschätzung für OFDM im digitalen Flugfunk

ISBN:978-3-8440-4979-4
Series:Erlanger Berichte aus Informations- und Kommunikationstechnik
Herausgeber: Prof. Dr. J. Huber, Prof. A. Kaup and Prof. Dr. W. Koch
Erlangen-Nürnberg
Volume:38
Keywords:Digital Communications; OFDM; LDACS1; Interference Mitigation; Channel Estimation; Filter Bank Pulse Blanking; Block-Based Frequency-Selective Interference Mitigation
Type of publication:Thesis
Language:English
Pages:208 pages
Figures:103 figures
Weight:277 g
Format:21 x 14,8 cm
Bindung:Paperback
Price:49,80 € / 62,30 SFr
Published:January 2017
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Abstract:The L-band Digital Aeronautical Communication System 1 (LDACS1) is a proposal for the upcoming data link for air traffic control. Due to the scarcity of free spectra, it is planned to operate in the frequency neighborhood of Distance Measuring Equipment (DME), whose signals have an impulsive Gaussian-shaped nature and interfere with the reception of LDACS1 signals.

The first contribution is a low complexity iterative channel estimation (LCICE) technique which employs equalized data as support pilots in order to refine the pilot-aided channel estimation (PACE) in scenarios where pilot values suffer from interference.

The second and major contribution are proposals for the mitigation of the DME interference which mainly is impulsive with respect to the symbol duration of the signal but also frequency-selective with respect to the signal bandwidth:

- The first proposal is a filter bank pulse blanking (FBPB) approach with subbandselective blanking decisions. It may be extended to a subband-selective interference detection with soft blanking, which softly blanks the subband signals according to the detected and estimated subband-selective instantaneous powers of interference and signal.

- Among FBPB, a block-based frequency-selective interference mitigation (BBFIM) is proposed, which makes use of an efficient low complexity block processing via fast Fourier transform (FFT) and an interference mitigation in frequency domain.

Both proposals outperform the state of the art, whereby FBPB offers a tremendous robustness against impulsive interference. They may be adapted to any interference situation and may be applied together with any modulation scheme including single-carrier modulation at receiver-side without changing the standard.