Link Adaptation Considering Mobility in OFDMA Systems with Multiple Transmit Antennas

Author

Lee, Seung Joon

Author_Institution

Electron. & Telecommun. Res. Inst., Daejeon

Volume

12

Issue

7

fYear

2008

fDate

7/1/2008 12:00:00 AM

Firstpage

493

Lastpage

495

Abstract

Link adaptation is investigated for OFDMA systems with multiple transmit antennas, where the transmission rate is adapted and where the subcarriers to be used and the multiple antenna transmission scheme to be applied are adaptively selected, according to instantaneous SNR and user mobility. The throughputs (defined as the transmission rate multiplied by 1-(outage probability)) of several transmission modes, which are differentiated by their use of subcarriers and multiple antennas, are compared. Numerical examples are presented showing that the best transmission mode depends on the instantaneous SNR, user mobility (or time-correlation of channel), and a rate adaptation scheme.

Keywords

OFDM modulation; antenna arrays; frequency division multiple access; transmitting antennas; OFDMA system; link adaptation; multiple transmit antennas; orthogonal frequency division multiple access system; rate adaptation scheme; user mobility; Adaptive arrays; Antennas and propagation; Array signal processing; Bandwidth; Frequency diversity; Radio spectrum management; Receiving antennas; Throughput; Transmitting antennas; Wireless communication;

fLanguage

English

Journal_Title

Communications Letters, IEEE

Publisher

ieee

ISSN

1089-7798

Type

jour

DOI

10.1109/LCOMM.2008.080341

Filename

4570449