Up link Capacity Enhancement Techniques in a CDMA Wireless Local Loop System | ||||
| Menoufia Journal of Electronic Engineering Research | ||||
| Article 1, Volume 16, Issue 1, January 2006, Page 1-14 | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/mjeer.2006.64166 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
| Sami A. El-Dolil; Emad S. Hassan | ||||
| Dept. of Electronic and Electrical Communication Eng., Faculty of Electronic Engineering, Menoufya University, EGYPT | ||||
| Abstract | ||||
| This paper proposes two different approaches to increase the uplink capacity of a Code Division Multiple Access Wireless Local Loop (CDMA-WLL) system. The first approach is to synchronize the uplink so that signals transmitted from different subscriber units within the same cell are time aligned at the base station (BS). The theoretical analysis of the potential capacity gain of uplink synchronous CDMA-WLL is presented. The second approach is to investigate the capacity improvement that can be achieved by using adaptive arrays at the BS. An analytical expression which relates the average bit error rate (BER) to the antenna directivity and the propagation environment is derived. | ||||
| References | ||||
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[1] W. Webb, Introduction to Wireless Local Loop. Norwood, MA: Artech House, 1998.
[2] F. Naguib, A. Paulraj, and T. Kailath, “Capacity improvement with base-station antenna arrays in cellular CDMA, ” IEEE Trans. Veh. Techonl., vol. 43, NO. 3, AUGUST 1994, PP. 691 – 698.
[3] J. O. Carnero, K. I. Pedersen, and P. E. Mogensen,“Capacity gain of an uplink-synchronous WCDMA system under channelization code constraints, ” IEEE Trans. Veh. Techonl., vol. 53, NO. 4, JULY 2004, PP. 982 – 991.
[4] K. I. Kim, Handbook of CDMA system design, engineering and optimization. Upper Saddle River, New Jersey: Prentice Hall PTR, 2000
[5] P. Petrus, R. B. Ertel, and J. H. Reed, “ Capacity enhancement using adaptive arrays in an AMPS system, ” IEEE Trans. Veh. Techonl., vol. 47, NO. 3, AUGUST 1998, PP. 717 – 727.
[6] J. C. Liberti, Jr., and T. S. Rappaport, “Analytical results for capacity improvements in CDMA,” IEEE Trans. Veh. Techonl., vol. 43, NO. 3, AUGUST 1994, PP. 680 – 690.
[7] T. S. Rappaport, and L. B. Milstein, “Effects of radio propagation path loss on DS-CDMA cellular frequency reuse efficiency for the reverse channel,” IEEE Trans. Veh. Techonl., vol. 41, NO. 3, AUGUST 1992, PP. 231 – 242.
[8] D. Lee, C. Xu, “The effect of narrowbeam antenna and multiple tiers on system capacity in CDMA wireless local loop,” IEEE Comm. Mag., Vol. 35, Issue 9, Sept. 1997, pp. 110 – 114. | ||||
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