In this paper an improved prediction-based power control is proposed for code division multiple access (CDMA) systems in Rayleigh fading channel environments. One of the most serious problems which degrades the performance of power control algorithm is the effect of feedback delay. To overcome the effect of feedback delay, power control needs to employ prediction algorithm which utilises the correlation property of the past channel samples measurements to predict the future sample values. In CDMA power control, however, the correlation property of channel measurements is destroyed because the transmit power is continuously updated for each power control interval. The prediction algorithm in this paper uses the recursive least square (RLS) technique and an improved predictor algorithm is proposed to compensate for the channel correlation. The result shows that the performance of improved predictive power control proposed in this paper evaluated in terms of bit error rate (BER) as a function of bit energy-tointerference power density ratio Eb/Io improved significantly from that of the conventional predictor.


K.S. Gilhousen, I.M. Jacobs, R. Padovani, A.J. Viterbi, L.A. Weaver, and C.E. Wheatley, IEEE Transaction on Vehicular Technology 40 (1991) 303.

A. Kurniawan, Proceedings of the 8th International Conference on Communication Systems (ICCS) 2002, Singapore, CD-ROM 3P-02-04, November 2002.

F.C.M. Lau, W.M. Tam, IEEE Transactions on Vehicular Technology 50 (1) (2001) 314.

K.S. Gilhousen, I.M. Jacobs, R. Padovani, L.A. Weaver, Jr., IEEE Journal on Selected Areas in Communications 8 (4) (1990) 503.

A. Chockalingam, P. Dietrich, L.B. Milstein, R.R. Rao, IEEE Transactions on Vehicular Technology 47 (3) (1998) 774.

C.J. Chung, J.H. Lee, F.C. Ren, IEEE Transactions on Vehicular Technology 45 (3) (1996) 522.

S. Ariyavisitakul, Proceedings of IEEE Global Telecommunications Conference (1992) 868.

A. Kurniawan, Ph.D Dissertation, Institute for Telecommunications Research, University of South Australia, Australia, 2002.

Anon., Third Generation Partnership Project (3GPP), Technical Specification TS 25.211, v2.5.0 (1999) 10.



To view the content in your browser, please download Adobe Reader or, alternately,
you may Download the file to your hard drive.

NOTE: The latest versions of Adobe Reader do not support viewing PDF files within Firefox on Mac OS and if you are using a modern (Intel) Mac, there is no official plugin for viewing PDF files within the browser window.