Mobile Ad Hoc beyond-Line-of-Sight (b-LoS) Networks

|| Funded by: Lockheed Martin

|| Period: November 2012 - November 2015

|| Amount: $641.376
Evaporation ducts, the layer in which rapid decrease in the refractive index occurs, can be used as communication medium in maritime and coastal environments for b-LoS communications. Since the propagating signals at microwave frequencies are trapped between ducting layer and sea surface due to the rapid change in the refractive index, the signal spreading through atmosphere becomes considerably less. As a result, the signals can travel over-the-horizon and this effect makes ducting layer a promising alternative for b-LoS communications.

 

               

Rays under various refractive conditions

 

On the other hand, ducting layer forms lossy waveguide and introduces severe multipath effect due to reflection from rough sea surface and evaporation duct. Therefore, we will develop channel model for evaporation duct based b-LoS communications. In addition, advanced communication techniques will be introduced in order to improve the system against multipath effect and ad hoc networking will be utilized to both improve communication system against multipath effect and provide reliable high rate communication.

 

 

 

Publications

    [Journal Papers]
    1. E. Dinc, O. B. Akan, "Path-loss and Correlation Analysis for Space and Polarization Diversity in Surface Ducts," to appear in IEEE Transactions on Antennas and Propagation, 2016.
    2. E. Dinc, O. B. Akan, "Beyond-Line-of-Sight Ducting Channels: Coherence Bandwidth, Coherence Time and Rain Attenuation," IEEE Communications Letters, vol. 19, no. 12, pp. 2274-2277, December 2015.
    3. E. Dinc, O. B. Akan, "A Nonuniform Spatial Rain Attenuation Model for the Troposcatter Communication Links," IEEE Wireless Communications Letters, vol. 4, no. 4, pp. 441-444, August 2015.
    4. E. Dinc, O. B. Akan, "Channel Model for the Surface Ducts: Large-scale Path-Loss, Delay Spread, and AOA," IEEE Transactions on Antennas and Propagation, vol. 63, no. 6, pp. 2728-2738, June 2015.
    5. E. Dinc, O. B. Akan, "More Than the Eye Can See: Coherence Time and Coherence Bandwidth of Troposcatter Links for Mobile Receivers," IEEE Vehicular Technology Magazine, vol. 10, no. 2, pp. 86-92, June 2015.
    6. E. Dinc, O. B. Akan, "A Ray-based Channel Modeling Approach for MIMO Troposcatter beyond-Line-of-Sight (b-LoS) Communications," IEEE Transactions on Communications, vol. 63, no. 5, pp. 1690-1699, May 2015.
    7. E. Dinc, O. B. Akan, "Fading Correlation Analysis in MIMO-OFDM Troposcatter Communications: Space, Frequency, Angle and Space-frequency Diversity," IEEE Transactions on Communications, vol. 63, no 2, pp. 476-486, February 2015.
    8. E. Dinc, O. B. Akan, "Beyond-Line-of-Sight Communications with Ducting Layer," IEEE Communications Magazine, vol. 52, no. 10, pp. 37-43, October 2014.
    [Conference Papers]
    1. E. Dinc, O. B. Akan, "Limited Feedback Multi-stage Beam-forming Method for Beyond-Line-of-Sight Ducting Channels," in Proc. IEEE MILCOM 2015, Tampa, FL, USA, October 2015.
    2. E. Dinc, O. B. Akan, "A Ray-based Channel Model For MIMO Troposcatter Communications," in Proc. IEEE PIMRC 2013, London, UK, September 2013.