Results 71 to 80 of about 40,526 (211)

A Neural Network MLSE Receiver Based on Natural Gradient Descent: Application to Satellite Communications

EURASIP Journal on Advances in Signal Processing, 2004
The paper proposes a maximum likelihood sequence estimator (MLSE) receiver for satellite communications. The satellite channel model is composed of a nonlinear traveling wave tube (TWT) amplifier followed by a multipath propagation channel. The receiver
Ibnkahla Mohamed, Yuan Jun
doaj   +1 more source

Modeling the GNSS Rural Radio Channel: Wave Propagation Effects caused by Trees and Alleys

, 2009
Among the various physical influencing factors with the potential to degrade the overall performance of a global navigation satellite system (GNSS), the behavior of the radio wave propagation channel occupies doubtlessly a central role.
Lehner, A., Schubert, F.M., Robertson, P., Fleury, B.H., Steingass, Alexander   +4 more
core  

Intercept Probability Constrained Robust Secure Beamforming Algorithm for Double‑Layer Satellite Networks

Shuju Caiji Yu Chuli
For the physical layer security communication scenario in double-layer satellite networks consisting of geostationary earth orbit （GEO） satellite and low earth orbit （LEO） satellite cluster， we propose a robust secure beamforming （BF） algorithm based on ...
WANG Zhenbiao, ZHAO Bai, WANG Yuchen, CHENG Ming, LIN Min   +4 more
doaj   +1 more source

Linear Precoding performance analysis in a Broadband satellite system with a 2-color dual-polarization reuse scheme [PDF]

, 2013
The potential of Joint Multiuser Processing in multi-beam satellite systems is assessed in this paper and proved to be a potential attractive alternative to current systems.
Vidal, Oriol, Inigo, Patricia, Lacan, Jérôme, Radzik, José, Alberty, Eric   +4 more
core  

Non-binary protograph low-density parity-check codes for space communications

, 2012
Protograph-based non-binary low-density parity-check (LDPC) codes with ultra-sparse parity-check matrices are compared with binary LDPC and turbo codes (TCs) from space communication standards.
Paolini, Enrico, G. Liva, B. Matuz, L. Costantini, Liva, Gianluigi, Chiani, Marco, Costantini, Laura, Matuz, Balazs   +7 more
core   +1 more source

Impact of Imperfect Channel State Information on RS Coding Aided Hybrid-ARQ in Rayleigh Fading Channels [PDF]

, 2010
Hybrid Automatic-Repeat-reQuest (ARQ) schemes are capable of maintaining reliable communications for transmission over hostile wireless channels. In coherent detection aided schemes, the achievable performance substantially depends on the accuracy of ...
H. A. Ngo, Ngo, Hoang Anh, L. Hanzo, Hanzo, Lajos   +3 more
core   +1 more source

Inferring River Channel Geometry Based on Multi-Satellite Datasets and Hydraulic Modeling

Remote Sensing
Channel geometry, e.g., riverbed elevation and channel width, is the fundamental input for hydrodynamic simulations and conveys critical information for understanding fluvial processes.
Youcan Feng, Junhui Liu, Xin Huang, Shaohua Zhao, Donghe Ma, Seungyub Lee, Ruibo Cao   +6 more
doaj   +1 more source

Bridging Gaps in Satellite Observations of River and Delta Landscapes Using Image Warping

Water Resources Research
Satellite images are increasingly used to monitor changes in fluvial landscapes such as channel migration, bar development, and avulsion. Yet, spatial and temporal gaps in image data — due to intervals between observations, cloud cover, or sensor ...
Youwei Wang, Yuan Li, Ajay B. Limaye
doaj   +1 more source

Propagation measurements for the characterization of a satellite-to-indoor channel in L-band

, 2022
S.63-69The satellite-to-indoor propagation channel in L-band has been measured and analyzed for several houses in Athens, Greece and Erlangen, Germany. The influence of a user on the reception (e.g. blockage) has been measured during the trials, too. The
Heuberger, A., Wagner, C., Heyn, T.
core  

Propagation Problems in Satellite Navigation [PDF]

, 2007
The presentation provides an overview about the mechanisms of the main propagation phenomena which are relevant for satellite navigation, their magnitude, temporal and regional variation and standard methods to correct and mitigate ...
Hornbostel, Achim
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