Beam Pattern Scanning (BPS) versus Space-Time Block Coding (STBC) and Space-Time Trellis Coding (STTC)

Peh Keong TEH, Seyed ZEKAVAT

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DOI: 10.4236/ijcns.2009.26051                

Abstract

In this paper, Beam Pattern Scanning (BPS), a transmit diversity technique, is compared with two well known transmit diversity techniques, space-time block coding (STBC) and space-time trellis coding (STTC). In BPS (also called beam pattern oscillation), controlled time varying weight vectors are applied to the antenna array elements mounted at the base station (BS). This creates a small movement in the antenna array pattern directed toward the desired user. In rich scattering environments, this small beam pattern movement creates an artificial fast fading channel. The receiver is designed to exploit time diversity benefits of the fast fading channel. Via the application of simple combining techniques, BPS improves the probability-of-error performance and network capacity with minimal cost and complexity. In this work, to highlight the potential of the BPS, we compare BPS and Space-Time Coding (i.e., STBC and STTC) schemes. The comparisons are in terms of their complexity, system physical dimension, network capacity, probability-of-error performance, and spectrum efficiency. It is shown that BPS leads to higher network capacity and performance with a smaller antenna dimension and complexity with minimal loss in spectrum efficiency. This identifies BPS as a promising scheme for future wireless communications with smart antennas.

Keywords

Antenna Array, Beam Pattern Sweeping, Transmit Diversity, Space-Time Block Codes, and Space-Time Trellis Coding

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	S. M. Alamouti, “A simple transmit diversity technique for wireless communications,” IEEE Journal on Selected areas in Communications, Vol. 16, No. 8, pp. 1451–1458, 1998.
[2]	V. Tarokh, H. Jafarkhani, and A. R. Calderbank, “Space-time block codes from orthogonal designs,” IEEE Transactions on Information Theory, Vol. 45, No. 5, pp. 1456–1467, July 1999.
[3]	V. Tarokh, N. Seshadri, and A. R. Calderbank, “Space-time codes for high data rate wireless communication: Performance criterion and code construction,” IEEE Transactions on Information Theory, Vol. 44, pp. 744–765, March 1998.
[4]	V. Tarokh, A. F. Naguib, N. Seshadri, and A. Calderbank, “Space-time codes for high data rate wireless communi-cations: Performance criteria in the presence of channel estimation errors, mobility, and multiple paths,” IEEE Transactions on Communications, Vol. 47, No. 2, Febru-ary 1999.
[5]	A. F. Naguib, V. Tarokh, N. Seshadri, and A. R Calderbank, “A space-time coding modem for high-data-rate wireless communications,” IEEE Journal on Selected Areas in Communications, Vol. 16, No. 8, October 1998.
[6]	N. Seshadri and J. H. Winters, “Two signaling schemes for improving the error performance of frequency division-duplex transmission system using transmitter an-tenna diversity,” International Journal Wireless Informa-tion Networks, Vol. 1, No. 1, pp. 49–60, January 1994.
[7]	J. H. Winters, “The diversity gain of transmit diversity in wireless systems with Rayleigh fading,” in Proceedings of the 1994 ICC/SUPERCOMM, New Orleans, Vol. 2, pp. 1121–1125, May 1994.
[8]	R. W. Heath, S. Sandhu, and A. J. Paulraj, “Space-time block coding versus space-time trellis codes,” Proceed-ings of IEEE International Conference on Communica-tions, Helsinki, Finland, June 11–14, 2001.
[9]	V. Tarokh, A. Naguib, N. Seshadri, and A. R. Calderbank, “Combined array processing and space-time coding,” IEEE Transactions on Information Theory, Vol. 45, No. 4, pp. 1121–1128, May 1999.
[10]	S. A. Zekavat and C. R. Nassar, “Antenna arrays with oscillating beam patterns: Characterization of transmit diversity using semi-elliptic coverage geometric-based stochastic channel modeling,” IEEE Transactions on Communications, Vol. 50, No. 10, pp. 1549–1556, Octo-ber 2002.
[11]	S. A. Zekavat, C. R. Nassar, and S. Shattil, “Oscillating beam adaptive antennas and multi-carrier systems: Achieving transmit diversity, frequency diversity and di-rectionality,” IEEE Transactions on Vehicular Technol-ogy, Vol. 51, No. 5, pp. 1030 –1039, September 2002.
[12]	S. A. Zekavat and C. R. Nassar, “Achieving high capacity wireless by merging multi-carrier CDMA systems and oscillating-beam smart antenna arrays,” IEEE Transac-tions on Vehicular Technology, Vol. 52, No. 4, pp. 772– 778, July 2003.
[13]	P. K. Teh and S. A. Zekavat, “A merger of OFDM and antenna array beam pattern scanning (BPS): Achieving directionality and transmit diversity,” accepted in IEEE 37th Asilomar Conference on Signals, Systems and Computers, November 9–12, 2003.
[14]	J. W. C. Jakes, Microwave Mobile Communications, New York, Wiley, 1974.
[15]	A. J. Rustako, N. Amitay, G. J. Owens, and R. S. Roman, “Radio propagation at microwave frequencies for line-of- sight microcellular mobile and personal communica-tions,” IEEE Transactions on Vehicular Technology, Vol. 40, No. 1, pp. 203–210, February 1991.
[16]	J. M. Auffray and J. F. Helard “Performance of multicar-rier CDMA technique combined with space-time block coding over Rayleigh channel,” IEEE 7th International Symposium on Spread-Spectrum Technology, Vol. 2, pp. 348–352, September 2–5, 2002.
[17]	A. G. Amat, M. Navarro, and A. Tarable, “Space-time trellis codes for correlated channels,” IEEE International Symposium on Signal Processing and Information Tech-nology, Darmstadt, Germany, December 14–17, 2003.
[18]	S. A. Zekavat and P. K. Teh, “Beam-pattern-scanning dynamic-time block coding,” Proceedings of Wireless Networking Symposium, The University of Texas at Austin, October 22–24, 2003.
[19]	B. Lu and X. D. Wang, “Iterative receivers for multiuser space-time coding systems,” IEEE Journal on Selected Areas in Communications, Vol. 18. No. 11, pp. 2322– 2335, November 2000.
[20]	E. Biglieri, A. Nordio, and G. Taricco, “Suboptimum receiver interfaces and space-time codes,” IEEE Transac-tions on Signal Processing, Vol. 51, No. 11, pp. 2720– 2728, November 2003.
[21]	H. B. Li and J. Li, “Differential and coherent decorrelat-ing multiuser receivers for space-time-coded CDMA sys-tems,” IEEE Transactions on Signal Processing, Vol. 50, No. 10, pp. 2529–2537, October 2002.