DocumentCode :
1185041
Title :
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
Link To Document :
بازگشت