Performance of adaptive antennas in the presence of sky-wave multipath propagation

Wu, K.H.; Daigle, M.

doi:10.1109/milcom.1998.722594

Cited by 2 publications

(2 citation statements)

References 3 publications

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“…The interference source was 240km from the target station, the soft log-periodic antenna was used for interference and the target radio signals would not be affected at all. Through the analysis and evidence, it is believed that there is a Sporadic E layer between jammers and the target radio, so the umbrella cone antenna was used for interference, as a result, the target radio was completely suppressed with a good interference effect [10]. The results validated the conclusions of this paper.…”

Section: ) Soft Log-periodic Antennasupporting

confidence: 79%

Discussion on HF sky-wave interference antenna selection methods

Bodong¹,

Xie²,

Sheng³

et al. 2012

Proceedings of 2012 5th Global Symposium on Millimeter-Waves

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This paper aims at the ineffective cases of HF radio interference within the operational distance from the sky-wave interference equipment, to put forward a conclusion that the Sporadic E-layer in the ionosphere can stop waves from arriving at the target radio by means of analysis of sky-wave propagation principles and the influencing factors between interference effects. Meanwhile, this paper puts forward ways to interfere the antenna due to different options of different distances and different heights of ionospheres, when the sky-wave interferes of the antenna radiation direction thus resolves the bad interference results caused by Sporadic E layer and testifies the conclusions through experiments as well through the study.

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Section: ) Soft Log-periodic Antennasupporting

confidence: 79%

Discussion on HF sky-wave interference antenna selection methods

Bodong¹,

Xie²,

Sheng³

et al. 2012

Proceedings of 2012 5th Global Symposium on Millimeter-Waves

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“…The radio signal propagation from the transmitter to the receiver spreads in angle via the multipath channel, due to the reflections from different layers, at different heights, and roughness of each layer. In the mid‐latitude range of the communication 1, effects of the different layers separate the angle of different paths at about 10$^{\circ }$ and that of the roughness at a few degrees. This angle spread is found mainly in elevation direction, and that in horizontal direction is relatively small because the multipath signals are coincided horizontally with the arc of great circle 2, 3.…”

Section: Introductionmentioning

confidence: 99%

Studies on the coherence bandwidth of high‐frequency vehicular communication system with antenna array

Li¹,

Duan²,

Ma³

et al. 2011

Wireless Communications

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High-frequency (HF) vehicular communication system works with the frequency-selective fading channel, thereby the coherence bandwidth is limited due to the multipath time dispersive effect, which imposes the difficulty for achieving the high-data rate transmission. The present paper investigates the antenna array technique for its ability in reducing the multipath delay spread of the ionosphere channel and, thus, increasing possibly the bandwidth of the HF system. To enable fast moving speed of the vehicular receiver, we propose to use single antenna at the receiver and the adaptive array at the transmitter. The adaptive beamforming is driven based on the protocol design and reciprocity principle of channel. In order to evaluate the performance of array system, a statistical HF double-directional channel model, which includes angular information at both the transmitter and receiver, is presented. The explicit expressions are obtained for calculating the coherence bandwidth. The numerical results show the efficiency of this approach for mid-latitude mid-range channel.

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Performance of adaptive antennas in the presence of sky-wave multipath propagation

Cited by 2 publications

References 3 publications

Discussion on HF sky-wave interference antenna selection methods

Discussion on HF sky-wave interference antenna selection methods

Studies on the coherence bandwidth of high‐frequency vehicular communication system with antenna array

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