Adaptive Minimum-Variance Closed-Loop Power Control in CDMA Cellular Systems

Tae-Woong YOON; Hyun-Jung KIM; Woonkyung M. KIM; Chung Gu KANG

Adaptive Minimum-Variance Closed-Loop Power Control in CDMA Cellular Systems

Tae-Woong YOON, Hyun-Jung KIM, Woonkyung M. KIM, Chung Gu KANG

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This paper introduces a new application of adaptive control theory to power control in a code division multiple access (CDMA) cellular system operating over mobile fading radio channels. Conventional feedback power control algorithms allow the base station to send a power command to either raise or lower each user's transmission power according to a bang-bang-like control policy. In this paper, we present an adaptive minimum-variance power control methodology which can be shown to improve power control performance consistently against a random nature of the near-far effect, shadowing and fast varying fading. Two adaptive implementations are considered: direct and indirect control. In the indirect adaptive control, a minimum-variance controller is combined with a constrained estimation algorithm to ensure the stability of a link gain model. In the direct adaptive control, the controller parameters are obtained directly from a standard estimation algorithm. Our simulations have shown that the proposed adaptive minimum-variance power control schemes provide much smaller error variance than the conventional fixed-step bang-bang control scheme and consequently the reverse channel capacity of the CDMA system can be significantly increased.

Publication: IEICE TRANSACTIONS on Communications Vol.E85-B No.1 pp.210-220

Publication Date: 2002/01/01

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Type of Manuscript: PAPER

Category: Wireless Communication Technology

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Tae-Woong YOON, Hyun-Jung KIM, Woonkyung M. KIM, Chung Gu KANG, "Adaptive Minimum-Variance Closed-Loop Power Control in CDMA Cellular Systems" in IEICE TRANSACTIONS on Communications, vol. E85-B, no. 1, pp. 210-220, January 2002, doi: .
Abstract: This paper introduces a new application of adaptive control theory to power control in a code division multiple access (CDMA) cellular system operating over mobile fading radio channels. Conventional feedback power control algorithms allow the base station to send a power command to either raise or lower each user's transmission power according to a bang-bang-like control policy. In this paper, we present an adaptive minimum-variance power control methodology which can be shown to improve power control performance consistently against a random nature of the near-far effect, shadowing and fast varying fading. Two adaptive implementations are considered: direct and indirect control. In the indirect adaptive control, a minimum-variance controller is combined with a constrained estimation algorithm to ensure the stability of a link gain model. In the direct adaptive control, the controller parameters are obtained directly from a standard estimation algorithm. Our simulations have shown that the proposed adaptive minimum-variance power control schemes provide much smaller error variance than the conventional fixed-step bang-bang control scheme and consequently the reverse channel capacity of the CDMA system can be significantly increased.
URL: https://global.ieice.org/en_transactions/communications/10.1587/e85-b_1_210/_p

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@ARTICLE{e85-b_1_210,
author={Tae-Woong YOON, Hyun-Jung KIM, Woonkyung M. KIM, Chung Gu KANG, },
journal={IEICE TRANSACTIONS on Communications},
title={Adaptive Minimum-Variance Closed-Loop Power Control in CDMA Cellular Systems},
year={2002},
volume={E85-B},
number={1},
pages={210-220},
abstract={This paper introduces a new application of adaptive control theory to power control in a code division multiple access (CDMA) cellular system operating over mobile fading radio channels. Conventional feedback power control algorithms allow the base station to send a power command to either raise or lower each user's transmission power according to a bang-bang-like control policy. In this paper, we present an adaptive minimum-variance power control methodology which can be shown to improve power control performance consistently against a random nature of the near-far effect, shadowing and fast varying fading. Two adaptive implementations are considered: direct and indirect control. In the indirect adaptive control, a minimum-variance controller is combined with a constrained estimation algorithm to ensure the stability of a link gain model. In the direct adaptive control, the controller parameters are obtained directly from a standard estimation algorithm. Our simulations have shown that the proposed adaptive minimum-variance power control schemes provide much smaller error variance than the conventional fixed-step bang-bang control scheme and consequently the reverse channel capacity of the CDMA system can be significantly increased.},
keywords={},
doi={},
ISSN={},
month={January},}

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TY - JOUR
TI - Adaptive Minimum-Variance Closed-Loop Power Control in CDMA Cellular Systems
T2 - IEICE TRANSACTIONS on Communications
SP - 210
EP - 220
AU - Tae-Woong YOON
AU - Hyun-Jung KIM
AU - Woonkyung M. KIM
AU - Chung Gu KANG
PY - 2002
DO -
JO - IEICE TRANSACTIONS on Communications
SN -
VL - E85-B
IS - 1
JA - IEICE TRANSACTIONS on Communications
Y1 - January 2002
AB - This paper introduces a new application of adaptive control theory to power control in a code division multiple access (CDMA) cellular system operating over mobile fading radio channels. Conventional feedback power control algorithms allow the base station to send a power command to either raise or lower each user's transmission power according to a bang-bang-like control policy. In this paper, we present an adaptive minimum-variance power control methodology which can be shown to improve power control performance consistently against a random nature of the near-far effect, shadowing and fast varying fading. Two adaptive implementations are considered: direct and indirect control. In the indirect adaptive control, a minimum-variance controller is combined with a constrained estimation algorithm to ensure the stability of a link gain model. In the direct adaptive control, the controller parameters are obtained directly from a standard estimation algorithm. Our simulations have shown that the proposed adaptive minimum-variance power control schemes provide much smaller error variance than the conventional fixed-step bang-bang control scheme and consequently the reverse channel capacity of the CDMA system can be significantly increased.
ER -