Distance dependence of path loss for millimeter wave inter-vehicle communications

Takahashi, Syouki; Kato, Akihito; Sato, Kei; Fujise, M.

doi:10.1109/vetecf.2003.1284971

Cited by 29 publications

(17 citation statements)

References 5 publications

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“…Brick walls and tinted glasses which are most likely coated by metallic film incur more than 25 dB losses easily in penetration and hence are almost serving as isolating media [2], [43], [44]. [45], [46] report pathloss models at 60 GHz for inter-vehicular scenarios in various traffic conditions with link-shadowing cars inbetween, showing the pathloss exponent being close to or smaller than the free space and the significant excess loss due to the link-shadowing cars. Human bodies are also relevant link shadowing objects both in the indoor and outdoor context.…”

Section: Large-scale Modelsmentioning

confidence: 99%

Channel Models and Beamforming at Millimeter-Wave Frequency Bands

Haneda

2015

IEICE Trans. Commun.

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SUMMARYMillimeter-wave (mm-wave) radio is attracting attention as one of the key enabling physical layer technologies for the fifthgeneration (5G) mobile access and backhaul. This paper aims at clarifying possible roles of mm-wave radio in the 5G development and performing a comprehensive literature survey on mm-wave radio channel modeling essential for the feasibility study. Emphasis in the literature survey is laid on grasping the typical behavior of mm-wave channels, identifying missing features in the presently available channel models for the design and evaluation of the mm-wave radio links within the 5G context, and exemplifying different channel modeling activities through analyses performed in the authors' group. As a key technological element of the mm-wave radios, reduced complexity beamforming is also addressed. Design criteria of the beamforming are developed based on the spatial multipath characteristics of measured indoor mm-wave channels.

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Section: Large-scale Modelsmentioning

confidence: 99%

Channel Models and Beamforming at Millimeter-Wave Frequency Bands

Haneda

2015

IEICE Trans. Commun.

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“…Channel models for Vehicle-to-Vehicle (V2V) communication were built using empirically measured data by Taliwal and colleagues [2] and for the 60 GHz band in [17]. These studies concentrate on identifying the communication range and on channel modeling and do not address the effects of antenna placement or vehicle orientation on system performance.…”

Section: Background and Related Workmentioning

confidence: 99%

Effect of Antenna Placement and Diversity on Vehicular Network Communications

Kaul

Ramachandran

Shankar

et al. 2007

2007 4th Annual IEEE Communications Society Conference on Sensor, Mesh and Ad Hoc Communications and Networks

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Abstract-In this paper we present empirical results from a study examining the effects of antenna diversity and placement on vehicle-to-vehicle link performance in vehicular ad hoc networks. The experiments use roofand in-vehicle mounted omni-directional antennas and IEEE 802.11a radios operating in the 5GHz band, which is of interest for planned inter-vehicular communication standards. Our main findings are two-fold. First, we show that radio reception performance is sensitive to antenna placement in the 5Ghz band. Second, our results show that, surprisingly, a packet level selection diversity scheme using multiple antennas and radios, Multi-Radio Packet Selection (MRPS), improves performance not only in a fading channel but also in line-of-sight conditions. This is due to propagation being affected by car geometry, leading to the highly non-uniform antenna patterns. These patterns are very sensitive to the exact antenna position on the roof, for example at a transmit power of 40mW the line-of-sight communication range varied between 50 and 250m depending on the orientation of the cars. These findings have implications for vehicular MAC protocol design. Protocols may have to cope with an increased number of hidden nodes due to the directional antenna patterns. However, car makers can reduce these effects through careful antenna placement and diversity.

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“…Specifically, in Otto et al (2009) V2V experiments were performed at 2.4 GHz frequency band in an open road environment and pointed out a significantly worse signal reception on the same road during the traffic heavy, rush hour period in comparison to a no traffic, late night period. A similar experimental V2V study presented in Takahashi et al (2003) analyzed the signal propagation in "crowded" and "uncrowded" highway scenarios (depending on the number of cars currently on the road) for the 60 GHz frequency band, and reported significantly higher path loss for the crowded scenarios. Several other studies (Jerbi et al (2007), Wu et al (2005), Matolak et al (2005), and Vehicle Safety Communications Project, Final Report (2006)) hint that other vehicles apart from the transmitter and receiver could be an important factor in modeling the signal propagation by obstructing the LOS between the communicating vehicles.…”

Section: Signal Propagation Modelsmentioning

confidence: 92%