International Journal of Computer Network and Information Security (IJCNIS)
IJCNIS Vol. 5, No. 6, 8 May 2013
Cover page and Table of Contents: PDF (size: 1574KB)
Enhancing the Capacity of Stratospheric Cellular Networks Using Adaptive Array Techniques
Full Text (PDF, 1574KB), PP.1-10
Views: 0 Downloads: 0
Author(s)
Sultan Aljahdali
1,*
Index Terms
Array Processing, Concentric Ring Arrays, Stratospheric Cellular Communications
Abstract
In this paper, the capacity of stratospheric cellular communications is improved by optimizing the amplitude feeding of the concentric rings array (CRA). The weighting profile of this array is chosen to be a cosine function raised to some power to control the beam pattern used in the cellular coverage. The power of this function is optimized to reduce the resulted sidelobe levels which increase the carrier-to-interference ratio (CIR) within the cells. It is found that increasing the power of the cosine function will reduce the sidelobe levels especially at lower number of elements in the innermost ring with a minor increase in beamwidth. For an innermost ring of 3 elements in a 10 rings CRA, a sidelobe level of 45 dB can be obtained below the mainlobe level. The simulation results show that a CIR of up to 38dB can be achieved and a minimum of 28dB at the cell borders is guaranteed with a 0.95 coverage ratio.
Cite This Paper
Sultan Aljahdali, "Enhancing the Capacity of Stratospheric Cellular Networks Using Adaptive Array Techniques", International Journal of Computer Network and Information Security(IJCNIS), vol.5, no.6, pp.1-10, 2013. DOI:10.5815/ijcnis.2013.06.01
Reference
[1]A. Mohammed and Z. Yang, "Broadband Communications and Applications from High Altitude Platforms", International Journal of Recent Trends in Engineering, Vol 1, No. 3, May 2009.
[2]A. Mohammed and T. Hult, Capacity Evaluation of a High Altitude Platform Diversity System Equipped with Compact MIMO Antennas", ACEEE International Journal on Communication, Vol 1, No. 1, Jan 2010.
[3]S. Karapantazis and F. Pavlidou, "Broadband communications via high-altitude platforms: a survey," IEEE Communications Surveys & Tutorials, vol. 7, pp. 2-31, 2005.
[4]M. Oodo, R. Miura, Y. Hase, T. Inaba, T. Sakamoto, and M. Suzuki, "Measurement results of digital beamforming array antenna on-board stratospheric platform in the band 31/28 GHz", Proceeding of 5th International Symposium on Wireless Personal Multimedia Communications, Honolulu, Hawaii, October 2002.
[5]E. Falletti, L. Lo Presti, and F. Sellone, "He LOST - Heliplat LOcalization SysTem based on smart antennas technology", Proceeding of IEEE 56th Vehicular Technology Conference, VTC Fall 2002, September 2002.
[6]Z. Xu, Y. Zakharov, and G. White, "Vertical antenna array and spectral reuse for ring-shaped cellular coverage from High Altitude Platform", Loughbourgh Antennas and Propagation Conference (LAPC 2006), November 2005.
[7]T. Isernia, F. J. Ares Pena, O. M. Bucci, M. D'Urso, J. F. Gomez, and J. A. Rodriguez, "A hybrid approach for the optimal synthesis of pencil beams through array antennas", IEEE Transactions Antennas and Propagation, Vol. 52, No.11,pp. 2912–2918, 2004.
[8]J. Thornton, D. Pearce, D. Grace, M. Oodo, K. Katzis and T. C. Tozer, "Effect of Antenna Beam Pattern and Layout on Cellular Performance in High Altitude Platform Communications", International Journal of Wireless Personal Communications, Springer, pp. 35-51, 2005
[9]G. White, E. Falletti, Z. Xu, D. Borio, F. Sellone, Y. Zakharov, L. Lo Presti, F. Daneshgaran "Report on adaptive beamforming algorithms for advanced antenna types for aerial platform and ground terminals", CAPANINA Project, Deliverable No. D17, 31st Jan 2006.
[10]J. Thornton, "A Low Sidelobe Asymmetric Beam Antenna for High Altitude Platform Communications", IEEE Microwave and Wireless Components Letters, Vol. 14, No. 2, pp. 59-61, February 2004.
[11]J. Thornton and D. Grace. "Optimizing an array of antennas for cellular coverage from a High Altitude Platform", IEEE Transactions Wireless Communications, Vol. 2, No. 3, pp. 484–492, May 2003.
[12]Y. Albagory, M. Dessouky, H. Sharshar, "Efficient Sidelobe Reduction Technique for Small-Sized Concentric Circular Arrays", Progress In Electromagnetics Research, PIER 65, pp. 187-200, 2006.
[13]Y. Albagory, M. Dessouky, H. Sharshar, "Optimum Normalized-Gaussian Tapering Window for Side Lobe Reduction in Uniform Concentric Circular Arrays," Progress In Electromagnetics Research, PIER 69, pp. 35 –46, 2007.
[14]Y. Albagory, M. Dessouky, H. Sharshar, "An Approach for Dolph-Chebyshev Uniform Concentric Circular Arrays," Journal of Electromagnetic Waves and Applications, JEMWA, Vol.21, No.6, pp.781 –794,2007.
[15]S. C. Chan, and H. H. Chen, "Uniform Concentric Circular Arrays with Frequency-Invariant Characteristics—Theory, Design, Adaptive Beamforming and DOA Estimation", IEEE Transactions on Signal Processing, Vol. 55, No. 1, pp. 165-177, January 2007.
[16]Y. Albagory, M. Dessouky, H. Sharshar, " An Approach for Low Sidelobe Beamforming in Uniform Concentric Circular Arrays" International Journal of Wireless Personal Communications, vol. 43, no. 4, pp. 1363-1368, 2007, Springer.
[17]Y. Albagory, "A Novel Design of Arbitrary Shaped Cells for Efficient Coverage from High Altitude Platforms" Progress In Electromagnetics Research Letters, Vol. 1, 245-254, 2008.
[18]J. Thornton, "A Low Sidelobe Asymmetric Beam Antenna for High Altitude Platform Communications", IEEE Microwave and Wireless Components Letters, Vol. 14, No. 2, pp. 59-61, February 2004.
[19]Moawad Dessouky, Hamdy Sharshar, Yasser Albagory "Improving The Cellular Coverage from A High Altitude Platform by Novel Tapered Beamforming Technique," Journal of Electromagnetic Waves and Applications, JEMWA, Vol.21, No.13, pp. 1721 –1731, 2007.
[20]Mostafa Nofal, Yasser Albagory, Mohiy Hadhoud, Moawad Dessouky, "A Novel Cellular Structure for Stratospheric Platform Mobil Communications ", Proc. of the Nineteenth National Radio Science Conference, NRSC'2002, March 19-21, Faculty of Engineering, Alexandria University, Alexandria, EGYPT, 2002.
[21]Mostafa Nofal, Yasser Albagory, Moawad Dessouky, Hamdy Sharshar, "Modeling and Investigating the Rotational Motion Effects of the High Altitude Platforms," Twenty Second National Radio Science Conference (NRSC 2005) March 15-17, 2005 Cairo – Egypt.
[22]Xu, Z. Zakharov, Y. White, G., "Antenna array optimisation using semidefinite programming for cellular communications from HAPs", IEEE Electronics Letters, Vol. 43, no. 2, pp. 67-69, 2007.