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A Telematics System Using In-Vehicle UWB Communications

In book: Novel Applications of the UWB Technologies
Source: InTech
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    ABSTRACT: A transmitter diversity technique for wireless communications over frequency selective fading channels is presented. The proposed technique utilizes orthogonal frequency division multiplexing (OFDM) to transform a frequency selective fading channel into multiple flat fading subchannels on which space-frequency processing is applied. Simulation results verify that in a slow fading environment the proposed space-frequency OFDM (SF-OFDM) transmitter diversity technique has the same performance as a previously reported space-time OFDM (ST-OFDM) transmitter diversity system but shows better performance in the more difficult fast fading environments. Other implementation advantages of SF-OFDM over the ST-OFDM transmitter diversity technique are also discussed
    Global Telecommunications Conference, 2000. GLOBECOM '00. IEEE; 02/2000
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    ABSTRACT: In recent years the number of vehicles has been increasing constantly on European roads. This higher traffic density makes new security features a crucial point in order to keep safe traffic. Inter-vehicle communication offers a lot of possibilities in this field, like collision warning or sensor fusion with sensors distributed in several vehicles. Transmitting such data between vehicles has strict requirements for the networking technology. On the one hand the communication system itself, which is built of vehicles and is so highly dynamic, requires a technology capable of handling the physical effects caused by the mobility of the communication partners. On the other hand the applications themselves can have strict constraints, especially regarding latency. Up to now, there is no special technology standardised for inter-vehicle communication, but because of its availability the wireless LAN according to the standard IEEE 802.11 is often seen as a possible solution. In this paper we present the behaviour of this technology in different driving situations focusing on the effects caused by the physical layer and the medium access layer.
    Intelligent Transportation Systems, 2005. Proceedings. 2005 IEEE; 10/2005
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    ABSTRACT: Antennas suitable for Intelligent Transport Systems (ITS) are overseen. The antennas serve a narrow-band high performance unlicensed 5.470-5.725 GHz Worldwide Interoperability for Microwave Access (WiMAX) deployed over a full-duplex bi-directional optical link. The system is composed of 3-RFports aimed to support Adaptive Antenna System (AAS), Multiple-Input Multiple-Output (MIMO) and Sectorization, for communications of about 70 ~ 100 Mbps over micro-cells along highways to moving vehicles incorporating a Ultra Wide Band (UWB) network of 480 Mbps. A design study has been carried out to assess the most cost-effective while efficient antenna units. The effects among antennas seen as interferers are also considered.
    Antennas and Propagation Conference, 2008. LAPC 2008. Loughborough; 04/2008

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