Evaluation of Downlink Performance of a Multiple-Cell, Rake Receiver Assisted CDMA Mobile System
ABSTRACT
In wireless Code Division Multiple Access (CDMA) system, the use of power control is indispensable to combat near-far and fading problems. Signals transmitted over a multipath propagation channel which exhibits inter-path interference and fading. The receiver has to employ measures to mitigate these effects or it will incur severe performance degradation. A classic approach in CDMA communications is the rake receiver. In this paper, the downlink performance is estimated for a CDMA mobile system at the vertex of multiple adjacent cells. At the base station the received signal is coherently dispread and demodulated using a rake receiver. The effects of power control, error correction and rake receiver were also investigated on the assumption that the received signals undergo Rayleigh fading, lognormal shadowing, and frequency selective fading. The evaluation of performance measures of base to mobile link (downlink) of a multiple-cell CDMA mobile system is presented. This study demonstrates that significant performance improvements are achievable with combined use of power control, rake receiver and error correction scheme.
In wireless Code Division Multiple Access (CDMA) system, the use of power control is indispensable to combat near-far and fading problems. Signals transmitted over a multipath propagation channel which exhibits inter-path interference and fading. The receiver has to employ measures to mitigate these effects or it will incur severe performance degradation. A classic approach in CDMA communications is the rake receiver. In this paper, the downlink performance is estimated for a CDMA mobile system at the vertex of multiple adjacent cells. At the base station the received signal is coherently dispread and demodulated using a rake receiver. The effects of power control, error correction and rake receiver were also investigated on the assumption that the received signals undergo Rayleigh fading, lognormal shadowing, and frequency selective fading. The evaluation of performance measures of base to mobile link (downlink) of a multiple-cell CDMA mobile system is presented. This study demonstrates that significant performance improvements are achievable with combined use of power control, rake receiver and error correction scheme.
Cite this paper
nullA. BAMISAYE and M. KOLAWOLE, "Evaluation of Downlink Performance of a Multiple-Cell, Rake Receiver Assisted CDMA Mobile System," Wireless Sensor Network, Vol. 2 No. 1, 2010, pp. 1-6. doi: 10.4236/wsn.2010.21001.
nullA. BAMISAYE and M. KOLAWOLE, "Evaluation of Downlink Performance of a Multiple-Cell, Rake Receiver Assisted CDMA Mobile System," Wireless Sensor Network, Vol. 2 No. 1, 2010, pp. 1-6. doi: 10.4236/wsn.2010.21001.
References
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[1] ADC, CDMA Capacity and Coverage, White Paper, http://www.adc.com, 2006. [2] K. S. Gilhousen, “On the capacity of a cellular CDMA system,” IEEE Transactions on Vehicular Technology, Vol. 40, pp. 303–312, 1991. [3] D. E. Borth and M. B. Pursley, “Analysis of direct- sequence spread spectrum multiple-access communica- tion over Rician fading channels,” IEEE Transactions of Communications, Vol. COM-27, pp. 1566–1577, 1979. [4] D. L. Schilling, L. B. Milstein, R. L. Pickholtz, F. Bruno, E. Kanterakis, M. Kullback, V. Erceg, W. Biederman, D. Fishman, and D. Salerno, “Broadband CDMA for personal communications system,” IEEE Communications Magazine, pp. 86–93, 1991. [5] I. B. Milstein, T. S. Rappaport, and R. Barghouti, “Performance evaluation for cellular CDMA,” IEEE Journal on Selected Areas in Communications, Vol. 10, No. 4, pp. 680–689, 1992. [6] A. N. Rosenberg and S. Kemp, “CDMA capacity and quality optimization,” McGraw-Hill, 2003 [7] M. D. Springer, “The algebra of random variables,” Wiley, New York, 1979. [8] K. W. Sowerby and A. G. Williamson “Outage probability calculations for a mobile radio systems with multiple interferers,” Electronic Letters, Vol. 24, No. 24, pp. 1511– 1513, 1988. [9] D. J. Torrieri, “The information bit-error-rate for block codes,” Transactions of Communications, Vol. COM-32, pp. 474–476, 1984. [10] Y. Hara, K. Suzuki, K. Kaneko, and T. Sekiguchi, Radio Resource Management and Power Control for W-CDMA Uplink with High Data Rate Packet Transmission, IEICE Transactions on Communications, E88-B(5), pp. 2102–2109, 2005. [11] A. J. Bamisaye and M. O. Kolawole, “Capacity and quality optimization in CDMA 3G networks,” Journal of Communication and Information Systems, 2009, (accepted for publication). [12] R. R. Gejji, “Forward-link-power control in CDMA cellular systems,” IEEE Transactions on Vehicular Technology, Vol. 4, pp. 532–536, 1992. [13] J. G. Proakis, “Digital communications,” McGraw Hill, 1995.