DocumentCode
1267840
Title
Adaptive bit loading scheme using COFDM at low elevation over LEO satellite communication channel
Author
Wan, Lei ; Gosling, I.G. ; Dubey, V.K.
Author_Institution
Sch. of Electr. & Electron. Eng., Nanyang Technol. Inst., Singapore
Volume
35
Issue
17
fYear
1999
fDate
8/19/1999 12:00:00 AM
Firstpage
1416
Lastpage
1418
Abstract
Much interest has been shown in employing LEO satellite communication systems. A novel algorithm is proposed for adaptive bit loading (multilevel modulation assignment) between COFDM subcarriers in a frequency selective fading channel. Two-dimensional alignment has been carried out. The system performance is greatly improved at low elevation angles compared to that using fixed bit loading. Furthermore. The comparison shows that this adaptive bit loading COFDM system is suitable for frequency selective slow fading channels, which have time-varying deep nulls in the frequency response
Keywords
OFDM modulation; fading channels; satellite communication; COFDM subcarrier; LEO satellite communication; adaptive bit loading; algorithm; elevation angle; frequency selective fading channel; multilevel modulation assignment; two-dimensional alignment;
fLanguage
English
Journal_Title
Electronics Letters
Publisher
iet
ISSN
0013-5194
Type
jour
DOI
10.1049/el:19990999
Filename
803573
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