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Power line communication (PLC) could not be established in automotive environments till now due to concerns with the unavoidable electromagnetic disturbances in the vehicle supply nets. Conducted broad band switching noise and field coupled narrow band noise can disturb the communication and prevent higher data rates. The continuously increasing size of the communication cable harnesses in vehicles...
In this paper, we develop a multiple input multiple output (MIMO) channel model for an outdoor optical wireless propagation scenario for car-to-car visible light communication system (C2C-VLC). In our model, two transmitters (front headlamps), reflectors and two receiving elements (back tail lamps) are considered which mainly reflect a multipath MIMO optical wireless channel. We proposed a new modular...
Information broadcasting technique from vehicles to vehicles under emergency situation aiming adaptive cruise control is researched in this paper. At the transmitter, code division multiple access (CDMA) based intensity modulation to visible light beam is used, while at the receiver, a matched filter after direct detection is employed to recover the signal. Our simulation results indicate that for...
We propose a power line communication (PLC) system for transmitting control signals in vehicle through internal power lines, such that the internal wires can be reduced and the vehicles can be lighter. The signals from different devices are multiplexed and modulated to the power lines by the transmitter. In the receiver, first the noise within power lines are filtered. Afterwards the multiplexed signals...
We propose a novel iterative decision-directed differential detection (iD4) technique for orthogonal frequency division multiplexing (OFDM) systems employing differential phase shift keying (DPSK) modulation in each subcarrier, such as the Eureka 147 digital audio/multimedia broadcasting (DAB/DMB) system. The iD4 technique improves the differential detection performance in fast fading channels by...
Today's situational awareness requirements in the undersea environment present severe challenges for acoustic communication systems. Acoustic propagation through the ocean environment severely limits the capacity of existing underwater communication systems. Specifically, the presence of internal waves coupled with the ocean sound channel creates a stochastic field that introduces deep fades and significant...
In this article, we introduce an algorithm to update the channel estimation in a flat fading channel. We assume an initial estimate of the channel is available, possibly from a training sequence, and the algorithm enhances this estimation so that longer packets and/or better BER can be achieved. The algorithm can work with any MIMO system but, when combined with VBLAST, can be implemented with a minor...
We present ??FlexVehd??, a flexible radio testbed for experimental testing of transmission and reception algorithms in vehicular environments. The main feature of our testbed is to provide maximum flexibility to researchers when conducting their experiments. FlexVehd allows the user to implement in software the signal construction at transmission and its reconstruction at reception, because it incorporates...
The orthogonal frequency division multiplex (OFDM), which is at the heart of many digital broadcasting and wireless standards, is very sensitive to Doppler spread induced by time variations of the mobile channel. This undesirable effect can be particularly detrimental to system performance when such a system is used for vehicular reception at high frequency bands since the maximum Doppler frequency...
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