A5004882474- Optical Wireless Communication Technologies
- Satellite Communication Systems
- Mathematical Analysis and Transform Methods
- Optical Network Technologies
- PAPR reduction in OFDM
- Digital Filter Design and Implementation
- Blind Source Separation Techniques
- Image and Video Quality Assessment
- Radar Systems and Signal Processing
- Image and Signal Denoising Methods
- Spacecraft Design and Technology
- Advanced Vision and Imaging
- Wireless Communication Networks Research
- Video Coding and Compression Technologies
- Space Satellite Systems and Control
- Advanced Wireless Communication Techniques
- Numerical Methods and Algorithms
- Neural Networks and Reservoir Computing
- Antenna Design and Optimization
- Chaos control and synchronization
Eindhoven University of Technology
2024
Netherlands Organisation for Applied Scientific Research
2019-2023
University of Twente
2008-2016
Embedded Systems (United States)
2016
The Balian-Low theorem (BLT) states the fundamental impossibility to design waveforms for L <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> (ℝ), which 1) form an orthogonal set, 2) are time-frequency localized, and 3) attain a critical waveform density such that they basis. This article closes gap between existing designs BLT. main contribution is of orthogonal, spectrum efficient hexagonal lattices. adaptive by single parameter,...
Multi-carrier communication is associated with a high peak-to-average power ratio (PAPR). A new PAPR reduction method proposed which based on rotating the time-frequency representation of transmit signal, prior to transmission. In general, rotation multi-carrier signal would change basis, affecting robustness in fading channels. Exceptions are signals constructed by (modulated) Hermite functions. The has been analyzed for 64 Allowing over 16 angles time-frequency, PAPR, occurs probability 10...
The anticipated capacity benefit of optical satellite communications has triggered a cascade technology developments. In this paper, we present three such technologies, namely; i). A cube laser terminal (CubeCAT), ii). lower Earth orbit head (LEOCAT) and iii). calibration verification test bench for coarse pointing assemblies, named (PTB). For these stability accuracy are central challenges. i) ii), discuss effects the thermal mechanical disturbances that threaten alignment system. We...
This paper proposes an efficient implementation of the H.264/AVC motion estimation algorithm in hardware and software. Furthermore, a complete co- design trajectory from HW-SW partitioning to actual on two different targets is shown. A Leon 3 + FPGA ARM Montium have been successfully realized. The shows speed-up 43.6times whereas 22.0times, both compared software-only implementation. Power consumption 42.0 mW for 60.2 Montium. co-simulation tool, CosiMate, used achieve target implementations...
Synchronization and matched filtering of signals in time dispersive, frequency dispersive time-frequency channels are addressed this paper. The 'eigenfunctions' these form the signal sets under investigation. While using channel-eigenfunctions is a first requirement for undistorted data transmission, second necessity to achieve good synchronization over domains frequency. problem non-stationary discussed. A spiral correlation method proposed time-frequency. Spiral correlation, pattern...
The product, convolution, correlation, Wigner distribution function (WDF) and ambiguity (AF) of two Hermite functions arbitrary order <formula formulatype="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex Notation="TeX">$n$</tex></formula> xmlns:xlink="http://www.w3.org/1999/xlink"><tex Notation="TeX">$m$</tex> </formula> are derived expressed as a bounded, weighted sum Notation="TeX">$n+m$</tex></formula> functions. It was already known...
A new signal set, based on the Fourier and Hermite bases, is introduced. It combines properties of basis signals with perfect time-frequency localization functions. The set characterized by both a high spectral efficiency good localization. Its robustness against shifts assessed compared to signals. Fourier-Hermite particularly designed for communications in spectrum-scarce environments.
Optical feeder links (OFLs) benefit from the vast amount of bandwidth available in THz-regime electromagnetic spectrum, and can be considered as enablers for future terabit-per-second satellite systems.A particular challenge OFLs is to mitigate effects fading, caused by a combination turbulence-induced scintillation, beam wander pointing errors.The conventional solution exploit temporal diversity interleaving forward error correction (FEC).In this study we present an overview fading...
Optical feeder links (OFLs) benefit from the vast amount of bandwidth available in THz-regime electro-magnetic spectrum, and could enable future terabit-per-second satellite systems. This study assesses end-to-end performance analog coherent OFLs for digital video broadcasting (DVB) applications, employing phase modulation (PM) double-sideband suppressed carrier (DSB-SC). Though both PM DSB-SC suffer non-linear distortion, we show that with optical index can be reduced such modulator is...