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—Vehicle-to-vehicle (VTV) wireless communications have many envisioned applications in traffic safety and congestion avoidance, but the development of suitable communications systems and standards requires accurate models for the VTV propagation channel. In this paper, we present a new wideband multiple-input-multiple-output (MIMO) model for VTV channels(More)
The development of efficient vehicle-to-vehicle (V2V) communications systems requires an understanding of the underlying propagation channels. In this paper, we present results on pathloss, power-delay profiles (PDPs), and delay-Doppler spectra from a high speed measurement campaign on a highway in Lund, Sweden. Measurements were performed at a This work is(More)
The fading process in high speed vehicular traffic telematic applications at 5 GHz is expected to fulfill the wide-sense stationarity uncorrelated scattering (WSSUS) assumption for very short time-intervals only. In order to test this assumption we apply the concept of a local time– and frequency–variant scattering function, which we estimate from(More)
— We carried out a car–to–infrastructure (C2I) and car–to–car (C2C) 4×4 multiple–input multiple–output (MIMO) radio channel measurement campaign at 5.2 GHz in Lund, Swe-den. This paper presents first results on pathloss, power–delay profiles, and delay–Doppler spectra in a C2C highway scenario, where both cars were traveling in opposite directions. A(More)
Car-to-car and car-to-infrastructure (henceforth called C2X) communications are constantly gaining importance for road-safety and other applications. In order to design efficient C2X systems, an understanding of realistic C2X propagation channels is required, but currently, only few measurements have been published. This paper presents a description of an(More)
We carried out a car-to-infrastructure (C21) and car-to-car (C2C) 4X4 multiple-input multiple-output (MIMO) radio channel measurement campaign at 5.2 GHz in Lund, Sweden. This paper presents first results on pathloss, power-delay profiles, and delay-Doppler spectra in a C2C highway scenario, where both cars were traveling in opposite directions. A pathloss(More)
Iterative multi-user detection and time-variant channel estimation in a multi-carrier (MC) code division multiple access (CDMA) uplink requires high computational complexity. This is mainly due to the linear minimum mean square error (MMSE) filters for data detection and time-variant channel estimation. We develop an algorithm based on the Krylov subspace(More)
—Based on a simple gossip algorithm, which computes the sum of values known by several nodes, we investigate the research challenge of distributed sphere decoding. We provide distributed algorithms to perform both the QR decomposition as well as the tree search. Compared to the case where one declares one node as a centralized unit, this approach is much(More)
This paper presents a description of an extensive vehicle-to-vehicle and vehicle-to-infrastructure channel measurement campaign conducted in the year 2007, in lund, Sweden. We focused on 4 X 4 Multiple-input multiple-output (MIMO) measurements at a center frequency of 5.2 GHz with high Doppler resolution. One vehicle-to-vehicle measurement data set where(More)
The scattering environment in vehicle-to-vehicle communication channels at 5.2 GHz changes rapidly. Hence the wide-sense stationary (WSS) uncorrelated scattering (US) assumption for the fading process is valid for short time intervals only. We characterize the spectral divergence of the local scattering function (LSF) sequence in order to assess the(More)