NDLI: Average efficiency of power amplifiers in power-controlled systems with multi-antenna diversity

Content Provider	IEEE Xplore Digital Library
Author	Apilo, O. Lasanen, M. Mammela, A. Jondral, F.K.
Copyright Year	2011
Description	Author affiliation: Communications Engineering Lab, Karlsruhe Institute of Technology (KIT), Germany (Jondral, F.K.) \|\| VTT Technical Research Centre of Finland Käitovaylä 1, P.O. Box 1100, FI-90571 Oulu, Finland (Apilo, O.; Lasanen, M.; Mammela, A.)
Abstract	We present a study of average efficiency of power amplifiers (PAs) in power-controlled systems with multi-antenna diversity. The efficiencies are analytically calculated using the transmitted power distributions. Several well-known multiple-input multiple-output (MIMO) diversity techniques, power control rules, PA classes, and channel models are considered. The considered diversity techniques are maximum ratio combining, selection combining, transmitting antenna selection, and maximum ratio transmission. Also the probability of an OFDM symbol clipping caused by PA saturation is calculated for the system under study. The analytical results are verified using Monte Carlo simulations. The study shows that the input signal distribution, diversity techniques, and the power control cutoff value have a significant effect on the average PA efficiency. The highest average PA efficiency is achieved when input signal has constant amplitude and selection combining is used. The presented results can be applied for an arbitrary PA e.g. when comparing the efficiency of different PAs.
Starting Page	1
Ending Page	6
File Size	321457
Page Count	6
File Format	PDF
ISBN	9781457701627
ISSN	19345070
e-ISBN	9781457701610
DOI	10.1109/WTS.2011.5960854
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-04-13
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	OFDM Transmitting antennas Diversity reception Power control Rician channels Power generation
Content Type	Text
Resource Type	Article

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