Open Access Open Access  Restricted Access Subscription or Fee Access

BER Improvement of Chaotic Communication Based OFDM System Using Adaptive Beamforming

Suchita Varade, Kishore D. Kulat

Abstract


Recent advances in wireless communications have made use of CDMA and OFDM techniques to allow for high data rate transmission. Rapid time variations of the wireless communication channel have an effect on the performance of multicarrier modulation. This paper presents the performance improvement of MIMO-OFDM system with a technique which uses chaotic communication system combined with adaptive beamforming in the presence of AWGN channel. The proposed system uses a new wireless communication structure based on two coupled chaotic systems. Simulation results demonstrate that the proposed system (chaotic based STC-MIMO-OFDM system) has good ability of suppressing interference & hence significantly improves the bit-error rate (BER) performance of the system. It is also observed that the modulation techniques used has its impact on the BER performance to great extent in chaotic based MIMO-OFDM system whereas the impact is negligible in the STTC based MIMO-OFDM system & PN sequence based STC-MIMO-OFDM system. A simulation tool with a graphical user interface which implements these algorithms are also developed to represent the various results in systematic manner.

Keywords


LMS (Least Mean Squares), Space-Time Turbo Code (STTC), Chaotic Communication System, Adaptive Beamforming

Full Text:

PDF

References


A.F. Naguib, N. Sechadri, and A.R. Calderbank, “Space time coding and signal processing for high data rate wireless communication,” IEEE Signal Processing Magazine, vol. 17, No. 3, pp. 76-92, May 2000.

N.S. Lee, Y.S. Choi, K.S. Kim, and C.K. Kim, “Performance of MIMO-OFDM systems with adaptive beamforming algorithm,” Vehicular Technology Conference, pp. 656-660, Sept. 2007

Special Issue on “Applications of Nonlinear Dynamics to Electronic and Information Engineering” Proceedings of the IEEE, May 2002, vol. 90,no. 5.

M. P. Kennedy, R. Rovatti, and G. Setti, Eds., Chaotic Electronics in Telecommunications. CRC Press, 2000.

F. C. M. Lau and C. K. Tse, Chaos-Based Digital Systems. Berlin: Springer-Verlag, 2003

R. V. Nee and R. Prasad, “OFDM for Wireless Multimedia Communications” London, U.K.:Artech House, 2000.

J. A. C. Bingham, “Multicarrier modulation for data transmission: An idea whose time has come” IEEE Commun. Mag., vol. 28,no. 5, pp. 5–14, May 1990.

W. C. Chung, N. J. Aug., and D. S. Ha, “Signaling and multiple access techniques for ultra wideband 4G wireless communication systems Wireless Commun”, vol. 12, pp. 46–55, Apr. 2005.

L. Hanzo, T. H. Liew, and B. L. Yeap,”Turbo Coding, Turbo Equalisation and Space-Time Coding for Transmission Over Fading Channels.” Piscataway, NJ: IEEE Press/Wiley, 2002.

J. H. Winters, “Optimum combining in digital mobile radio with with cochannel interference” IEEE J. Sel. Areas Commun.,vol. SAC-2, no. 4, pp. 528–539, Jul. 1984

J. H. Winters, ”On the capacity of radio communication systems with diversity in a Rayleigh fading environment, IEEE J. Sel. Areas Commun”., vol. SAC-5, no. 5,pp. 871–878, Jun. 1987

S. Ng and L. Hanzo, B”On the MIMO channel capacity of multi-dimensional signal sets”, in Proc. 60th IEEE Conf. Vehicular Technology,Sep. 2006, vol. 3, pp. 1594–1598.

L. Hanzo, M. Mu¨nster, B. J. Choi, and T. Keller, “OFDM and MC-CDMA for Broadband Multi-User Communications, WLANs and Broadcasting” Piscataway, NJ:IEEE Press/Wiley, 2003

S. M. Alamouti, BA simple transmit diversity technique for wireless communications,[IEEE J. Sel. Areas Commun., vol. 16, no. 8,pp. 1451–1458, Oct. 1998.

V.Tarokh, A. Naguib, N. Seshadri, and A. R. Calder bank, “Space time codes for high data rate wireless communication: Performance criteria in the presence of channel estimation errors, mobility, and T. multiple paths”, IEEE Trans. Commun. ,vol. 47, no. 2, pp. 199–207, Feb1999

T.-H. Liew and L. Hanzo, “Space-time trellis and space-time block coding versus adaptive modulation and coding aided OFDM for wideband channels”, IEEE Trans. Veh.Technol., vol. 55, no. 1, pp. 173–187, Jan. 2006

J. Blogh and L. Hanzo. (2002).”Third-Generation Systems and Intelligent Networking” Piscataway, NJ, IEEE Press/Wiley. [Online]. Available: http://www-mobile.ecs.soton.ac.uk.

St. Louis “Data comm. Research Company, Using MIMO-OFDM Technology to Boost Wireless LAN Performance Today”, White Paper, , Jun. 2005.

H. Sampath, S. Talwar, J. Tellado, V. Erceg, and A. J. Paulraj, “A fourth-generation MIMO-OFDM broadband wireless system: Design, performance, and field trial results”, IEEE Commun. Mag., vol.40, no.9, pp. 143–149, Sep. 2002.

V. Tarokh, N. Seshadri, and A. R. Calder bank, space-time block codes from orthogonal designs", IEEE Trans. on IT, Vol. 45, pp. 1456-1467, July 1999

S. M. Alamouti, "A simple transmit diversity technique for wireless Communications", IEEE JSAC, Vol. 16, No. 8, pp 1451-1458, October 1998.

G.Jongren, M.Skoglund and B. Ottersten, “Combining beamforming and orthogonal space-time block coding,” IEEE Trans. Inf. Theory, vol. 48, pp. 611–627, Mar. 2002.

V. Tarokh, H. Jafarkhani, A.R. Calder bank, “Space-time block coding for wireless communications: Performance results”, IEEE Journal on Selected Areas in Communication,vol.17, pp. 451-460, Mar.

S.W.Varade & K.D.Kulat “Robust Algorithms for DOA Estimation and Adaptive Beamforming for Smart Antenna Application” International Conference on Emerging Trend in Engineering & Technology (ICETET 2009) at G.H.Raisoni College of Engg.,Nagpur,16-18 Dec.2009

S.W.Varade & K.D.Kulat “Performance Analysis of MVDR Beamformer for Smart Antenna Applications” International Conference on VLSI and Communication(ICVCom-09), Kerela April16-18,2009

S.W.Varade & K.D.Kulat “Performance analysis of MIMO-OFDM system using space-time turbo codes and adaptive beamforming”International Journal of Computer Application(0975-8887),Volume 22-No..3,May2011


Refbacks

  • There are currently no refbacks.


Creative Commons License
This work is licensed under a Creative Commons Attribution 3.0 License.