Increasing the power efficiency of an IEEE802.11a power amplifier

Author

Chen, K.C. ; Morris, K.A. ; Beach, M.A.

Author_Institution

Dept. of Electr. & Electron. Eng., Bristol Univ., UK

Volume

2

fYear

2005

fDate

30 May-1 June 2005

Firstpage

954

Abstract

OFDM modulation is extensively used in many applications. However, it also exhibits high peak-to-average power ratios (PAPR) requiring the associated transmit amplifier to have a very large linear region. This linear amplifier does therefore have poor power efficiency. To reduce the PAPR, cupping and filtering was carried out at baseband. This paper investigates the impact that clipping has on the resultant power efficiency and BER. The simulations show that when the input back-off (IBO) dynamically controls the input average power in every OFDM symbol, for a 64-subcarrier QPSK OFDM signal, the power efficiency can be improved by 55% without increasing the bit error rate.

Keywords

OFDM modulation; error statistics; power amplifiers; quadrature phase shift keying; radiofrequency amplifiers; wireless LAN; BER; IEEE802.11a power amplifier; OFDM modulation; QPSK; bit error rate; peak-to-average power ratios; power efficiency; transmitting amplifier; Baseband; Bit error rate; Chromium; Digital video broadcasting; Filtering; High power amplifiers; OFDM modulation; Peak to average power ratio; Power amplifiers; Power engineering and energy; Clipping; OFDM; Power amplifier; Power efficiency;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 2005. VTC 2005-Spring. 2005 IEEE 61st

ISSN

1550-2252

Print_ISBN

0-7803-8887-9

Type

conf

DOI

10.1109/VETECS.2005.1543447

Filename

1543447