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

Author

Peng, Jingbo ; Wei, Guo ; Zhu, Jinkang

Author_Institution

Dept. of Electron. Eng. & Inf. Sci., Univ. of Sci. & Technol. of China, Hefei

Volume

12

Issue

9

fYear

2008

fDate

9/1/2008 12:00:00 AM

Firstpage

621

Lastpage

623

Abstract

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.

Keywords

OFDM modulation; channel capacity; OFDM system; optimal power allocation method; per-antenna power constraint; signal distortion; system capacity; total transmit power constraint; traditional water-filling method; Distortion; Gaussian noise; Information science; Linearity; Mathematical model; OFDM; Power amplifiers; Signal processing; Throughput; Wideband; OFDM system; Per-antenna power constraint; power allocation; total transmit power constraint;

fLanguage

English

Journal_Title

Communications Letters, IEEE

Publisher

ieee

ISSN

1089-7798

Type

jour

DOI

10.1109/LCOMM.2008.080618

Filename

4623758