CDMA power control error reduction via predictive filtering

Details CDMA power control error reduction via predictive filtering CDMA power control error reduction via predictive filtering

1998-03-04

2000-12-19

Bost, Dwayne D.

Telecommunications

Transmitter and receiver at separate stations

Plural transmitters or receivers

455 671, 455115, 455561, H04B 700

Patent

active

061637076

ABSTRACT:
The power control process receives a signal from the radiotelephone over the time varying reverse link. The received signal is demodulated and decoded. The resulting signal is used to estimate the .sup.E w/I.sub.0. The .sup.E w/f.sub.0 is compared to a threshold .sup.E w/I.sub.0 to generate a power control error. This error is input to a prediction filter that anticipates increases or decreases in the power control error over the time interval of the reverse link. The result from the prediction filter is used to modify the power control bit accordingly before transmission to the radiotelephone.

REFERENCES:
patent: 5305468 (1994-04-01), Bruckert et al.
patent: 5812938 (1998-09-01), Gilhousen et al.
patent: 5878329 (1999-03-01), Mallinckrodt
Qiang Shen; Krzymien, W.A., Performance improvement of closed loop power control in CDMA cellular mobile communication systems. IEEE Catalog Number: 96CH35894 pp. 56-60, Apr. 1996.
Mecklenbrauker, IEEE paper, vol. 5, No. 4, Apr. 98, Remarks on the Minimum Phase Property of Optimal Prediction Error Filters and Some Related Questions.
Sim, M.L., IEEE catalog No: 98TH8384, Study on the characteristics of Predicitive Closed Loop Power Control Algorithms for a Cellular DS/CDMA System, Oct. 1998.
Zhang Yongsheng, IEEE Catalog No: 97TH8255, Power Control Based on Adaptive Prediction in the CDMA/TDAM System, Aug. 1997.
Tanskanen, et al., "Predictive Closed Loop Power Control for Mobile CDMA Systems,"(1997).

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