Christoph F. Mecklenbräuker

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—We propose and analyze a low-complexity channel estimator for a multiuser multicarrier code division multiple access (MC-CDMA) downlink in a time-variant frequency-selective channel. MC-CDMA is based on orthogonal frequency division multiplexing (OFDM). The time-variant channel is estimated individually for every flat-fading subcarrier, assuming small(More)
—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)
| To make transportation safer, more efficient, and less harmful to the environment, traffic telematics services are currently being intensely investigated and developed. Such services require dependable wireless vehicle-to-infrastructure and vehicle-to-vehicle communications providing robust con-nectivity at moderate data rates. The development of such(More)
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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, and understanding of realistic C2X propagation channels is required, but currently, only few measurements have been published. This paper presents a description of an(More)
SUMMARY Signals transmitted through multiple-input multiple-output (MIMO) wireless channels suffer from multiple-access interference (MAI), multipath propagation and additive noise. Iterative multiuser receiver algorithms mitigate these signal impairments, while offering a good tradeoff between performance and complexity. The receiver presented in this(More)