Effect of employing directional antennas on mobile OFDM system with time-varying channel

Author

Ng, Wee Teck ; Dubey, V.K.

Author_Institution

Sch. of Electr. & Electron. Eng., Nanyang Technol. Univ., Singapore

Volume

7

Issue

4

fYear

2003

fDate

4/1/2003 12:00:00 AM

Firstpage

165

Lastpage

167

Abstract

In this letter, we analyze the inter-carrier-interference (ICI) caused by Doppler spreading in an orthogonal frequency-division multiplexing system when the angle-of-arrival (AOA) of the received signal is not uniformly distributed. An expression of the ICI power is derived by taking into account the probability density function of the AOA. We also present examples using directional antennas at the base station, at the mobile or at both mobile and base station. The ICI power changes marginally when a directional antenna is placed at the base station. Finally, we show that the ICI power can be reduced substantially when a directional antenna, along with frequency tracking, is employed at the mobile.

Keywords

OFDM modulation; directive antennas; mobile radio; radiofrequency interference; time-varying channels; AOA; Doppler spreading; ICI; angle-of-arrival; base station; directional antennas; frequency tracking; inter-carrier-interference; mobile OFDM system; orthogonal frequency-division multiplexing system; power; probability density function; received signal; time-varying channel; Base stations; Delay effects; Directional antennas; Frequency division multiplexing; Interference; OFDM; Performance loss; Probability density function; Signal analysis; Time-varying channels;

fLanguage

English

Journal_Title

Communications Letters, IEEE

Publisher

ieee

ISSN

1089-7798

Type

jour

DOI

10.1109/LCOMM.2003.811198

Filename

1195498