679 research outputs found
Two new sum-of-sinusoids-based methods for the efficient generation of multiple uncorrelated rayleigh fading waveforms
This paper deals with the design of a set of multiple uncorrelated Rayleigh fading waveforms. The Rayleigh fading waveforms are mutually uncorrelated, but each waveform is correlated in time. The waveforms are generated by using the deterministic sum-of-sinusoids (SOS) channel modeling principle. Two new closed-form solutions are presented for the computation of the model parameters. Analytical and numerical results show that the resulting deterministic SOS-based channel simulator fulfills all main requirements imposed by the reference model with given correlation properties derived under two-dimensional isotropic scattering conditions. The proposed methods are useful for the design of simulation models for diversity-combined Rayleigh fading channels, relay fading channels, frequencyselective channels, and multiple-input multiple-output (MIMO) channels. © 2006 IEEE
Efficient sum-of-sinusoids-based simulation of mobile fading channels with asymmetric Doppler power spectra,” The
Abstract-In this paper, we deal with the problem of designing efficient sum-of-sinusoids (SOS) based simulators for frequency non-selective mobile fading channels under non-isotropic scattering conditions. To cope with this problem, we propose a new parameter computation method that can be applied on any given asymmetrical Doppler power spectrum (DPS). With the aim to reduce the computational costs associated with the simulation of high-quality channel waveforms, we also present an efficient simulation approach that combines the proposed parameter computation method with the principle of set partitioning. By considering a reference model for a fading channel with asymmetrical DPS, it is shown that the resulting SOSbased channel simulator satisfactorily emulates the channel's autocorrelation function (ACF). Owing to its characteristics, the proposed channel simulation procedure proves to be a helpful tool for the test and performance analysis of modern wireless communication systems under non-isotropic scattering scenarios
A Novel Simulator of Nonstationary Random MIMO Channels in Rayleigh Fading Scenarios
For simulations of nonstationary multiple-input multiple-output (MIMO) Rayleigh fading channels in time-variant scattering environments, a novel channel simulator is proposed based on the superposition of chirp signals. This new method has the advantages of low complexity and implementation simplicity as the sum of sinusoids (SOS) method. In order to reproduce realistic time varying statistics for dynamic channels, an efficient parameter computation method is also proposed for updating the frequency parameters of employed chirp signals. Simulation results indicate that the proposed simulator is effective in generating nonstationary MIMO channels with close approximation of the time-variant statistical characteristics in accordance with the expected theoretical counterparts
VLSI Architectures and Rapid Prototyping Testbeds for Wireless Systems
The rapid evolution of wireless access is creating an ever changing variety of standards for indoor and outdoor environments. The real-time processing demands of wireless data rates in excess of 100 Mbps is a challenging problem for
architecture design and verification. In this paper, we consider current trends in VLSI architecture and in rapid prototyping testbeds to evaluate these systems. The key phases in multi-standard system design and prototyping
include: Algorithm Mapping to Parallel Architectures – based on the real-time data and sampling rate and the resulting area, time and power complexity; Configurable Mappings and Design Exploration – based on heterogeneous architectures consisting of DSP, programmable application-specific instruction (ASIP) processors, and co-processors; and Verification and Testbed Integration
– based on prototype implementation on programmable devices and integration with RF units.Nokia Foundation FellowshipNokia CorporationNational InstrumentsNational Science Foundatio
Heterogeneous Acceleration for 5G New Radio Channel Modelling Using FPGAs and GPUs
L'abstract è presente nell'allegato / the abstract is in the attachmen
MSAT-X: A technical introduction and status report
A technical introduction and status report for the Mobile Satellite Experiment (MSAT-X) program is presented. The concepts of a Mobile Satellite System (MSS) and its unique challenges are introduced. MSAT-X's role and objectives are delineated with focus on its achievements. An outline of MSS design philosophy is followed by a presentation and analysis of the MSAT-X results, which are cast in a broader context of an MSS. The current phase of MSAT-X has focused notably on the ground segment of MSS. The accomplishments in the four critical technology areas of vehicle antennas, modem and mobile terminal design, speech coding, and networking are presented. A concise evolutionary trace is incorporated in each area to elucidate the rationale leading to the current design choices. The findings in the area of propagation channel modeling are also summarized and their impact on system design discussed. To facilitate the assessment of the MSAT-X results, technology and subsystem recommendations are also included and integrated with a quantitative first-generation MSS design
Development of a MATLAB Toolbox for Mobile Radio Channel Simulators
A profound knowledge of mobile radio channels is required for the development, evaluation, and
also assessment at practical conditions of present and future mobile radio communication
systems. The modelling, analysis, and simulation of mobile radio channels are important sub area
since the initiation of mobile communications. In addition to that knowledge of channel
behaviour in mobile radio communication is extensively recommended for the study of
transmitter/receiver performances. Our intention in this master's thesis is to develop various
kinds of mobile fading channel simulators using MATLAB and embed them into MATLB
software as a toolbox.
Implemented channel simulators were combined into a user-friendly Matlab toolbox from which
users can easily select well-known channel models to test and to study the performance of
mobile communication systems. The help file was developed based on HTML. It gives better
support for the new users to work on the developed channel simulators, run the test procedures as
well as parameter computation. The help file consistent with other supplementary programs like
computation of PDF and CDF for different distributions, Rice simulation model, extended
Suzuki process type I and II simulator etc. In addition to that each program consists with
guidelines embedded with the source code. The help file web interfaces are listed in Appendix-
1.The toolbox can be integrated into the new release of Matlab software.
The toolbox contains channel simulators for simulating non-stationary land mobile satellite
channel, spatial shadowing processes, MIMO channels, multiple uncorrelated Rayleigh fading
channels, mobile to mobile channel, frequency hopping channels etc. We developed set of test
procedures, such as the autocorrelation function ACF, average duration of fades ADF, the
probability density function PDF, and the level-crossing rate LCR etc., in order to test and to
confirm the correctness of the implemented channel simulators. Proposed new algorithms to
compute the model parameters of the channel simulators were also implemented in the toolbox to
enable the parameterization of the channel simulators under specific propagation conditions.
Finally, “how can a channel simulator be tested?” have been address in the thesis as a research
question. It was based on the comparison of simulation results with the measured model or the
reference model under different scenarios. In addition to that selection of the simulation time
duration, sampling rate and size of the samples were considered. Developed test procedures were
helped to assess the implemented channel simulators
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