International Journal of Information Technology and Computer Science (IJITCS)
IJITCS Vol. 5, No. 11, 8 Oct. 2013
Cover page and Table of Contents: PDF (size: 617KB)
Beampattern for Multiple Antennas in Hybrid Terrestrial Satellite Communications System (HTSCS)
Full Text (PDF, 617KB), PP.21-31
Views: 0 Downloads: 0
Author(s)
Farman Ullah
1,*
Nadia N Qadri
1
Aamir Khan
1
Khalid Ibrahim
1
Index Terms
Beamforming, Multiple Antennas, Hybrid Communication, CCI, Pre-FFT, Post-FFT
Abstract
The hybrid architecture of Terrestrial and Satellite networks discussed in this paper utilizes frequency reuse. However, at the same time the frequency reuse results in Co-Channel Interference (CCI). The CCI is caused by the mobile users to the satellite end because of the strong receiver on the satellite end. Mainly, this paper will focus on to tone down the CCI and would also show that how the OFDM based adaptive beamforming can be employed to mitigate this interference. The technique which is being used to mitigate this interference is Pre-FFT adaptive beamforming also called as time domain beamforming. In this paper, main task is to mitigate the CCI which is induced by the mobile users to the satellite end and will be considered that there are J users. Out of these J users there is one desired user and rest are interferers. When the interfered data is received at the satellite end, the Pre-FFT adaptive beamforming extracts the desired user data from the interferers by applying the complex weights to the received symbol. The weight for the next symbol is then updated by Least Mean Square (LMS) algorithm and then is applied to it. This process is carried out till all the desired user data is extracted from the interference signal.
Cite This Paper
Farman Ullah, Nadia N Qadri, Aamir Khan, Khalid Ibrahim, "Beampattern for Multiple Antennas in Hybrid Terrestrial Satellite Communications System (HTSCS)", International Journal of Information Technology and Computer Science(IJITCS), vol.5, no.11, pp.21-31, 2013. DOI:10.5815/ijitcs.2013.11.03
Reference
[1]S. Colieri, M. Ergen, A. Piro, Bahai. A study of channel estimation in OFDM systems Vehicular Technology Conference, 2002. Proceedings VTC 2002-Fall. 2002 IEEE 56th, Vol. 2 (10 December 2002), pp. 894-898 Vol. 2
[2]L. Hanzo, W. Webb, and T. Keller, “ Single and Multi-carrier Quadrature Amplitude Modulation: Principles and Applications for Personal Communications, WLANs and Broadcasting,”. John Wiley and IEEE Press 2000
[3]F.Mueller –Roemer, “Directions in audio broadcasting,” Journal of the Audio Engineering Society, vol.44, pp.158-173, March 1993 and ETSI, Digital Audio Broadcasting (DAB),2nd ed.,May 1997. ETSI 300 401
[4]ETSI,Digital Video Broadcast (DVB);Framing structure, channel coding and modulation for digital terrestrial television, August 1997. EN 300 744 V1.1.2
[5]H.Sari, G. Karam, and I. Jeanclaude, “Transmission techniques for digital terrestrial TV broadcasting,”IEEE Communications Magazine, pp.100-109, February 1995
[6]ANSI,ANSI/T1E1.4.94-007, Asymmetric Digital Subscriber Line (ADSL) Metallic Interface., August 1997
[7]Cox, H. [1973], “Resolving power and sensitivity to mismatch of optimum array processors,” Jour. Acoust. Soc. Amer., Vol. 54 No. 3, pp. 771-785, 1973.
[8]William Y. Zou and Yiyan Wu, “COFDM: An Overview,” IEEE Transactions on Broadcasting, vol. 41, NO, 1, March 1995.
[9]Litwin, L. and Pugel, M, “The Principles of OFDM,” RF signal processing Magazine Jan 2001 pp 30-48, www.rfdesign.com Accessed [ 21 April 2010]
[10]Shaoping Chen and Cuitao Zhu, “ICI and ISI Analysis and Mitigation for OFDM Systems with Insufficient Cyclic Prefix in Time-Varying Channels,” IEEE Transaction on Consumer Elecronics, vol. 50, No. 1, Feb 2004
[11]R. M. Shubari and A. Merri, “Convergence of adaptive beamforming algorithms for wireless communications,” Proc. IEEE and IFIP International Conference on Wireless and Optical Communications Networks, Dubai, UAE, March 6-8, 2005.
[12]R. M. Shubair, “Robust Adapative Beamforming using Alogrithm with SMI initialization,” Proc. IEEE 2005.
[13]Chan Kyu KIM, “Pre-FFT Adaptive Beamforming Algorithm for OFDM System with Array Antenna,” IEICE Trans. Commun., bol. E86-B, NO.3,2003
[14]Zhongding Lei, Francois P. S. Chin, “ Post and Pre FFT beamforming in an OFDM system,” IEEE 59th Vehicular Technology Conference, 2004-Spring. 17-19 May 2004 pp. 39-40 Vol.1 Milan, Italy
[15]Ari T. Alastalo, MikaKahola, “Smart antenna operation for indoor wireless local-area networks using OFDM,” IEEE Trans. On Wireless Communications, vol.2 no. 2, March 2003.
[16]Book, Smart Antennas by Lal Chand Godara, 2004 by CRC press LLC.
[17]Shinsuke Hara, Montree Budsabathon, and Yoshitaka Hara, “ A Pre-FFT OFDM Adaptive Antenna Array with Eigenvector Combining,” 2004 IEEE international Conference Condition on communication, Vol. 4, pp. 2412-2416, June 2004.
[18]R. Prasad and H. Harada, “A novel OFDM based wireless ATM system for future broadband multimedia communications,” in Proceeding of ACTS Mobile Communication Summit ’97,(Denmark), pp. 757-762, ACTS, &-10 October 1997
[19]Barry D. Van Veen and Kevin M. Buckley, “Beamforming A versatile approach to spatial filtering,” IEEE Signal Processing Magazine vol. 5 No. 2 April 1988 pp4-24
[20]Dainiele Borio, Laura Camoriano, Ltizia Lo Presti, “Weiner Solution for OFDM Pre and Post-FFT Beamforming,” 14th European Signal Processing Conference (EUSIPCO 2006), Florence, Italy, September 4-8, 2006
[21]Ming LEI, Ping ZHANG, Hirshi HARADA, Hiromitsu WAKANA, “LMS Adaptive Beamforming based on Pre-FFT combining for Ultra High Data-Rate OFDM system,” Proc. IEEE 2004.
[22]R. M. Shubair, “Robust Adapative Beamforming using Alogrithm with SMI initialization,” Proc. IEEE 2005.
[23]Chan Kyu KIM, “Pre-FFT Adaptive Beamforming Algorithm for OFDM System with Array Antenna,” IEICE Trans. Commun., bol. E86-B, NO.3,2003
[24]Zhongding Lei, Francois P. S. Chin, “Post and Pre FFT beamforming in an OFDM system,” IEEE 59th Vehicular Technology Conference, 2004-Spring. 17-19 May 2004 pp. 39-40 Vol.1 Milan, Italy
[25]Ari T. Alastalo, MikaKahola, “Smart antenna operation for indoor wireless local-area networks using OFDM,” IEEE Trans. On Wireless Communications, vol.2 no. 2, March 2003.
[26]Book, Smart Antennas by Lal Chand Godara, 2004 by CRC press LLC.
[27]Shinsuke Hara, Montree Budsabathon, and Yoshitaka Hara, “ A Pre-FFT OFDM Adaptive Antenna Array with Eigenvector Combining,” 2004 IEEE international Conference Condition on communication, Vol. 4, pp. 2412-2416, June 2004.