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Transmit Power Adaptations for Uplink CDMA Systems with Successive Interference Cancellation in Wireless Fading Channels

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에스케이텔레콤 (주) (SKTelecom)|2005.04|Telecommunications Review|제15권 제2호|pp. 369-378

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참고문헌

주제분류전자/정보통신공학

초록

Abstract

Power adaptation for direct-sequence code-division multiple-access (DS/CDMA) communication systems that employ successive interference cancellation (SIC) receiver is considerd. The transmission power is adapted so that, with the channel variations, the received power levels of each user have appropriate disparities. Under the constraint of average transmission power, we consider two strategies in adjusting the disparity between received signal power. With the first strategy, the average BER for a given user averaged over channel fading satistics is minimized, while with the other, the instantaneous BER is equl for all users. We find that the performance differenae between two strategies becomes negible as average transmission power or line-of-sight component increas. We also showthat the proposed power adaptaion yielding appropriate disparity in received power levels has a significant performance gain over the conventional power adaptation that ensures equal received power for all users.

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