Effects of user distribution on CDMA antenna array receivers

The use of sectorised antenna array receivers for the uplink of cellular code division multiple access systems is discussed. The distribution of users in the sector can seriously alter the sector capacity that can be achieved. The authors consider two algorithms, matched filtering and interference suppression, and their performance for different user distributions. Simulation results are presented to show the effect of user clustering on system performance for a number of different scenarios.

[1]  Thomas Kailath,et al.  Capacity improvement with base-station antenna arrays in cellular CDMA , 1994 .

[2]  Arogyaswami Paulraj,et al.  A harmonic noise model for direction finding in colored ambient noise , 1995, IEEE Signal Processing Letters.

[3]  Arogyaswami Paulraj,et al.  Performance of Wireless CDMA with M-ary Orthogonal Modulation and Cell Site Antenna Arrays , 1996, IEEE J. Sel. Areas Commun..

[4]  W. C. Y. Lee,et al.  Overview of cellular CDMA , 1991 .

[5]  I. Reed,et al.  Rapid Convergence Rate in Adaptive Arrays , 1974, IEEE Transactions on Aerospace and Electronic Systems.

[6]  A. Paulraj,et al.  Adaptive transmitting antenna arrays with feedback , 1994, IEEE Signal Processing Letters.

[7]  Andrew J. Viterbi,et al.  On the capacity of a cellular CDMA system , 1991 .

[8]  John G. Proakis,et al.  Digital Communications , 1983 .

[9]  G.J.R. Povey,et al.  Capacity of a cellular time division duplex CDMA system , 1994 .

[10]  Klaus I. Pedersen,et al.  Power azimuth spectrum in outdoor environments , 1997 .

[11]  Elvino S. Sousa,et al.  Delay spread measurements for the digital cellular channel in Toronto , 1994 .

[12]  J. H. Winters,et al.  Effect of fading correlation on adaptive arrays in digital mobile radio , 1994 .

[13]  J. H. Winters.  Signal acquisition and tracking with adaptive arrays in the digital mobile radio system IS-54 with flat fading , 1993 .

[14]  Hui Liu,et al.  Blind equalization in antenna array CDMA systems , 1997, IEEE Trans. Signal Process..