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Optimization of guard time length for mobile WiMAX system over multipath channel

Osman, Waiel Elsayed and Abd Rahman, Tharek (2008) Optimization of guard time length for mobile WiMAX system over multipath channel. In: IMECS 2008: International Multiconference Of Engineers And Computer Scientists, Vols I and II. Lecture Notes in Engineering and Computer Science, I & II . Int Assoc Engineers-Iaeng, China, pp. 1125-1129. ISBN 978-988-98671-8-8

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Guard time length (GT) is one of the key OFDM parameters. It is implemented as Cyclic Prefix (CP) to completely alleviate Intersymbol Interference (ISI) and to preserve orthogonality among OFDM subcarriers as long as the guard time length is sufficiently greater than channel delay spread. Conventional OFDM system uses a large GT length to tolerate worst case channel condition irrespective of its current state. This technique, however, degrades the overall spectral efficiency as well as consumes transmitter energy proportional to the length of the guard time. In this paper, we optimize the guard time length for mobile WiMAX system over ITU-R M.1225 multipath fading channel. The overall system performance and resultant packet error rate (PER) are slightly improved as function of the guard time length.

Item Type:Book Section
Additional Information:ISBN: 978-988-98671-8-8; International Multiconference of Engineers and Computer Scientists, Hong Kong, Peoples R China, Mar 19-21, 2008
Uncontrolled Keywords:Radiotelephone, OFDM
Subjects:T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions:Electrical Engineering
ID Code:12849
Deposited By: Liza Porijo
Deposited On:04 Jul 2011 01:28
Last Modified:04 Jul 2011 01:28

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