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

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 th...

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Bibliographic Details
Published in:IEEE communications letters 2003-04, Vol.7 (4), p.165-167
Main Authors: Wee Teck Ng, Dubey, V.K.
Format: Article
Language:English
Subjects:
Applied sciences
Base stations
Channels
Delay effects
Directional antennas
Doppler
Doppler effect
Exact sciences and technology
Frequency division multiplexing
Information, signal and communications theory
Interference
Multiplexing
OFDM
Orthogonal Frequency Division Multiplexing
Performance loss
Probability density function
Signal analysis
Signal and communications theory
Spreading
Stations
Systems, networks and services of telecommunications
Telecommunications
Telecommunications and information theory
Time-varying channels
Tracking
Transmission and modulation (techniques and equipments)
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Summary: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.
ISSN:1089-7798
1558-2558
DOI:10.1109/LCOMM.2003.811198