Optimum power control for successive interference cancellation with imperfect channel estimation

10 March 2003

journal article
Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Wireless Communications

Vol. 2 (2) , 375-383
https://doi.org/10.1109/twc.2003.809123

Abstract

Successive interference cancellation, in conjunction with orthogonal convolutional codes, has been shown to approach the Shannon capacity for an additive white Gaussian noise channel. However, this requires highly accurate estimates for the amplitude and phase of each user's signal. We derive an optimal power control strategy specifically designed to maximize the overall capacity under the constraint of a high degree of estimation error. This power control strategy presents a general formula of which other power control algorithms are special cases. Even with estimation error as high as 50%, capacity can be approximately doubled relative to not using interference cancellation. In addition, when properly applied to multicell mobile networks, this power control scheme can reduce the handset transmit power, and therefore other-cell interference, by more than an order of magnitude.

Keywords

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