Browse > Article

Differential Code-Filtering Correlation Method for Adaptive Beamforming  

Hefnawi Mostafa
Denidni Tayeb A.
Publication Information
Journal of Communications and Networks / v.7, no.3, 2005 , pp. 258-262 More about this Journal
Abstract
An adaptive beamforming system based on code filtering and differential correlation approaches is proposed. The differential correlation method was originally proposed for time delay estimation of direct sequence code division multiple access (DS-CDMA) systems under near-far ratio conditions and the code filtering correlation algorithm, on the other hand, was proposed for array response estimation in DS-CDMA systems under perfect power control. In this paper, by combining differential correlation concept with the code filtering beamforming technology, an accurate estimate of the beam forming weights and an enhanced performance of DS-CDMA systems under sever near-far ratio conditions is achieved. The system performance in terms of beam pattern and bit-error-rate (HER) shows that the proposed adaptive beamformer outperforms the conventional code filtering correlation technique.
Keywords
Adaptive beamforming; array response estimation; code-filtering; differential correlation; DS-CDMA;
Citations & Related Records

Times Cited By Web Of Science : 0  (Related Records In Web of Science)
Times Cited By SCOPUS : 0
연도 인용수 순위
  • Reference
1 M. Hefnawi and Q. M. Rahman, 'Differential correlation delay estimation for DS-CDMA systems,' in Proc. Int. Symp. Antenna Technol. Applied Electromagnetics Conf. URSI, July 2004, pp. 633-636
2 F. Naguib, A. Paulraj, and T. Kailath, 'Capacity improvement with basestation antenna arrays in cellular CDMA,' IEEE Trans. Veh. Technol., vol. 43, pp. 691-698, Mar. 1994   DOI   ScienceOn
3 R. Kohno, 'Spatial and temporal communication theory using adaptive antenna array,' IEEE Pers. Commun., pp. 28-35, Feb. 1998   DOI   ScienceOn
4 V. Ghazi-Moghadam and M. Kaveh, 'A CDMA interference canceling receiver with an adaptive blind array,' IEEE J. Selected Areas Commun., vol. 16, no. 8, Oct. 1998
5 F. Naguib and A. Paulraj, 'Performance of wireless CDMA with M-ary orthogonal modulation and cell site antenna array,' IEEE J. Select. Areas Commun., vol. 14, pp. 1770-1783, Sept. 1996   DOI   ScienceOn
6 M. H. Zarrabizadeh and E. S. Sousa, 'A differentially coherent PN code acquisition receiver for CDMA systems,' IEEE Trans. Commun., vol. 45, pp. 1456-1465, Nov. 1997   DOI   ScienceOn
7 J. S. Thompson, P. M. Grant, and B. Mulgrew, 'Smart antenna arrays for CDMA systems,' IEEE Pers. Commun., pp. 16-25, Oct. 1996
8 H. Liu and G. Xu, 'Smart antennas in wireless systems: Uplink multiuser blind channel and sequence detection,' IEEE Trans. Commun., vol. 45, no. 2, Feb. 1997
9 T. Ristaniemi and J. Joutsensalo, 'Code timing acquisition for DS-CDMA in fading channels by differential correlations,' IEEE Trans. Commun., vol. 49, pp. 899-910, May 2001   DOI   ScienceOn
10 J. H. Winters, 'Smart antennas for wireless systems,' IEEE Pers. Commun., pp. 23-27, Feb. 1998
11 S. E. Bensley and B. Aazhang, 'Subspace-based channels estimation for code division multiple access communications systems,' IEEE Trans. Commun., vol. 44, pp. 1009-1020, Aug. 1996   DOI   ScienceOn
12 B. Widrow and S. D. Stearns, Adaptive Signal Processing, Englewood Cliffs, Prentice Hall, 1985
13 J. H. Winters, 'Optimum combining in digital mobile radio with cochannel interference,' IEEE J. Selected Areas Commun., vol. 2, pp. 528-539, July 1984   DOI   ScienceOn
14 S. Haykin, Adaptive Filter Theory. NJ: Prentice Hall, 2002
15 C. D. Chung, 'Differentially coherent detection technique for direct-sequence code acquisition in a Rayleigh fading channel,' IEEE Trans. Commun., vol. 43, pp. 1116-1126, Feb. Mar. Apr. 1995   DOI   ScienceOn
16 E. G. Strom, S. Parkvall, S. L. Miller, and B. E. Ottersten, 'Propagation delay estimation in asynchronous direct-sequence code-division multiple access systems,' IEEE Trans. Commun., vol. 44, pp. 84-93, Jan. 1996   DOI   ScienceOn
17 B. D. VanVeen, 'Adaptive convergence of linearly constrained beamformers based on the sample covariance matrix,' IEEE Trans. Signal Processing, vol. 39, pp. 1470-1473, 1991   DOI   ScienceOn
18 J. C. Liberti Jr. and T. S. Rappaport, Smart Antennas for Wireless Communications: IS-95 and Third Generation CDMA Applications, NJ, Prentice Hall, 1999
19 X. Wang and H. V. Poor, 'Robust adaptive array for wireless communications,' IEEE J. Selected Areas Commun., vol. 16, no. 8, Oct. 1998
20 L. J. Horowitz, H. Blatt, W. G. Brodsky, and K. D. Senne, 'Controlling adaptive antenna arrays with the sample matrix inversion algorithm,' IEEE Trans. Aerosp. Electron. Syst., vol. AES-15, pp. 840-847, 1979   DOI   ScienceOn