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Power Allocation Method for OFDM System with both Total and Per-Antenna Power Constraints

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3 Author(s)
Jingbo Peng ; Dept. of Electron. Eng. & Inf. Sci., Univ. of Sci. & Technol. of China, Hefei ; Guo Wei ; Jinkang Zhu

In this paper, we propose an optimal power allocation method for OFDM system with both total transmit power constraint (TTPC) and per-antenna power constraint (PAPC). In contrast to traditional water-filling method, the new one takes into account of the signal distortion caused by PAPC in deducing system capacity, therefore can achieve a more accurate allocation between multiple sub-channels. Simulation results confirm that the new method can better reduce signal distortion and maximize system capacity, especially when the signal power approaches the limit of PAPC.

Published in:

Communications Letters, IEEE  (Volume:12 ,  Issue: 9 )

Date of Publication:

September 2008

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