Real-time channel emulation of a geometry-based stochastic channel model on a SDR platform

Hofer, Markus; Xu, Zhinan; Zemen, Thomas

doi:10.1109/spawc.2017.8227646

Cited by 13 publications

(8 citation statements)

References 10 publications

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“…RF propagation in mobile channels is a very complex matter and several channel models have been developed, based on a statistical approach [5]. Narrowband channel emulators implementation have been proposed [6] and low-complexity architectures have been developed dealing with delays that are not integer multiples of the sampling rate [7] or solutions where massive calculations are demanded to a GPU (Graphical Processing Unit) using native highly parallelized architecture [8].…”

Section: Multipath System-level Modelsmentioning

confidence: 99%

Doppler Shift Time Expansion Resolution and Spectral Performance in Wideband Real-Time RF Channel Emulators

Rossi¹

2019

ASI

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The possibility to test a radio frequency transceiver through the use of appropriate channel emulators allows evaluating their performance under various operating conditions. Many systems are able to operate with a relatively limited instantaneous bandwidth by applying known statistical models. Sometimes, it is necessary to evaluate the performance of a RF transceiver installed on high or very high speed platforms over predictable trajectories using optionally DEM (Digital Elevation Model) data of the terrain to estimate the number of stimulated paths and their contributions during the flight. When the instantaneous bandwidth of the signal becomes high (over several hundreds of MHz), one of the most important phenomena to consider is the Doppler spread induced by the channel and traditional narrowband models become useless. This paper presents some results when a time expansion is adopted to emulate the transceiver dynamic and the consequent Doppler spread with the aim of controlling the spectral purity of the emulated propagation channel.

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Section: Multipath System-level Modelsmentioning

confidence: 99%

Doppler Shift Time Expansion Resolution and Spectral Performance in Wideband Real-Time RF Channel Emulators

Rossi¹

2019

ASI

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show abstract

Section: Multipath System-level Modelsmentioning

confidence: 99%

Doppler Shift Time Expansion Resolution and Spectral Performance in Wideband Real-Time RF Channel Emulators

Rossi¹

2019

Preprint

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The possibility to test a radio frequency transceiver through the use of appropriate channel emulators allows to evaluate their performance under various operating conditions. Many systems are able to operate with a relatively limited instantaneous bandwidth by applying known statistical models. Sometimes it is necessary to evaluate the performance of a RF transceiver installed on high or very high speed platforms over predictable trajectories using optionally DEMs (Digital Elevation Models)data of the terrain to estimate the number of stimulated paths and their contributions during the flight. When the instantaneous bandwidth of the signal becomes high (over several hundred of MHz), one of the most important phenomenon to consider is the Doppler spread induced by the channel and traditional narrowband models become unuseful. In this paper there are presented some results when a time expansion is adopted in order to emulate the transceiver dynamic and the consequent Doppler spread with the aim to control the spectral purity of the emulated propagation channel.

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“…While they are essential for analysis, these have the problem, especially in vehicular settings, that they lack reproducibility of the exact scenarios due to the highly dynamic nature of the vehicular channel, and the many unknown parameters, such as weather and scatterer position. Finally, as a compromise that allows reproducibility, while still capturing the physical properties and the use of real hardware, channel emulation has been used as tool to assess communication performance [ 17 , 18 ]. Channel emulation has proven a valuable tool, but it faces new design challenges for mmWave communications.…”

Section: Introductionmentioning

confidence: 99%

“…Geometry-based channel emulation generates a vehicular channel from geometric data, employing tools such as Geometry-based Stochastic Channel Model (GSCMs) [ 18 , 19 ]. Alternatively, raytracing could be applied [ 20 , 21 ].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Millimeter Wave Vehicular Channel Emulation: A Framework for Balancing Complexity and Accuracy

Blazek

Zöchmann

Mecklenbräuker

2018

Sensors

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We propose a general framework for the specification of a sparse representation of millimeter wave vehicular propagation channels and apply this to both synthetic data and real-world observations from channel sounding experiments. The proposed framework is based on the c-LASSO (complex Least Absolute Shrinkage and Selection Operator) which minimizes the mean squared error of the sparse representation for a given number of degrees of freedom. By choosing the number of degrees of freedom, we balance the numerical complexity of the representation in the channel emulation against its accuracy in terms of the mean squared error. A key ingredient is the choice of basis of the representation and we discuss two options: the Fourier basis and its projection onto a given subband. The results indicate that the subband-projected Fourier basis is a low-complexity choice with high fidelity for representing clustered channel impulse responses. Finally, a sequential estimator is formulated which enforces a consistent temporal evolution of the geometry of the interacting objects in the propagation environment. We demonstrate the performance of our approach using both synthetic data and measured 60 GHz vehicular channel traces.

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Real-time channel emulation of a geometry-based stochastic channel model on a SDR platform

Cited by 13 publications

References 10 publications

Doppler Shift Time Expansion Resolution and Spectral Performance in Wideband Real-Time RF Channel Emulators

Doppler Shift Time Expansion Resolution and Spectral Performance in Wideband Real-Time RF Channel Emulators

Doppler Shift Time Expansion Resolution and Spectral Performance in Wideband Real-Time RF Channel Emulators

Millimeter Wave Vehicular Channel Emulation: A Framework for Balancing Complexity and Accuracy

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