Directional Antennas for Vehicular Communication - Experimental Results

Timm‐Giel, Andreas; Subramanian, A.; Dhanasekaran, Kannan; Navda, Vishnu; Das, Sanghamitro

doi:10.1109/vetecs.2007.85

Cited by 4 publications

(2 citation statements)

References 4 publications

(3 reference statements)

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“…Directional transmit antenna help improve the quality of the links, help cover longer ranges, increase security and avoid unnecessary interference in the network. While recent works have shown that use of directional antennas in cellular and ad-hoc wireless network, increase the capacity of the network [8], [9], [10], [11], this work focuses on implementation of relay schemes with directional antennas in cellular networks where all the base stations share the same frequency spectrum.…”

Section: A Related Workmentioning

confidence: 99%

Relay selection scheme using directional antennas for cellular networks

Ponnavaikko

Wilson

Holliday

2009

2009 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing

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Cellular base stations are expensive to install as they require the operator to lease real estate and establish backhaul connectivity to the public network. With increasing demand for bandwidth, service providers are installing more and more relay base stations to supplement the main base station. Although relays help increase the coverage and capacity of the network, they also end up raising the net interference in the system. Decentralized relay selection algorithms that do not take interference into account, could end up under-using the capacity of the network.In this paper we propose a two-hop decentralized relay selection scheme using directional antennas that mitigates the effects of interference and performs better than the "nearest relay selection"[1] algorithm in networks with less number of relay stations. Furthermore we propose a relaying scheme where the network adaptively chooses a relay selection algorithm to use, based on the current number of relay stations in the network.

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Section: A Related Workmentioning

confidence: 99%

Relay selection scheme using directional antennas for cellular networks

Ponnavaikko

Wilson

Holliday

2009

2009 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing

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“…In addition to polarization, the impact of antenna radiation pattern is also explored by comparing the results of omni-directional and bi-directional antennas. It has been shown that directional antennas can potentially increase the mean duration of a connection by a factor of 4 when connecting from a vehicle to existing access points in suburban environment [20]. On the vehicular network level, the distribution of received frames over different angles of arrival in city-wide simulations shows a dominance of angles around 0 • and 180 • [21].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Impact of Antenna Characteristics on Non-Stationary V2I Channel Parameters in Tunnels

Yusuf

Tanghe

Laly

et al. 2020

IEEE Trans. Veh. Technol.

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This paper analyses the experimentally-assessed dual-polarized (DP) mobile channel in a tunnel environment at 1.35 GHz under traffic conditions. We investigate the impact of antenna polarization and radiation pattern on the non-stationary vehicle-to-infrastructure (V2I) channel. Basic channel evaluation metrics are examined including path gain, co-polarization ratio (CPR), and cross-polarization discrimination (XPD). In addition, the stationarity region is estimated using the channel correlation function approach, and used to calculate the time-varying delay and Doppler power profiles. Statistical models are presented for parameters like CPR, XPD, RMS delay and Doppler spreads, where the lognormal distribution provides the best fit. The polarization and the opening angle of the antennas into the propagation channel are found to strongly influence the observed non-stationarity of the channel. They impact the degree of multipath richness that is captured, thus providing different path gain, delay and Doppler spreads. Based on our analysis, the directional antenna with vertical polarization provides the longest stationarity time of 400 ms at 90 km/h, as well as the highest path gain and lowest dispersion. Furthermore, the DP channel capacity is calculated and its dependence on different normalization approaches is investigated. We propose a more accurate normalization for the DP channels that takes the conservation of energy into account. Moreover, the subchannels correlation coefficients are determined. While the condition number is found to be low on average, the correlation results show high correlation among the DP subchannels. As conclusion, we show how the CPR and XPD play the main role in providing multiplexing gain for DP tunnel channels.

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