Adaptivity on an OFDM fixed wireless access system

Author

Valkanas, Antonios D. ; Dallas, Panagiotis I. ; Karachalios, George J. ; Poularikas, Alexander D.

Author_Institution

Dev. Programmes Dept., INTRACOM SA, Athens, Greece

fYear

2002

fDate

2002

Firstpage

458

Lastpage

462

Abstract

A special characteristic of multicarrier modulation techniques such as OFDM is that they can assign different modulation schemes to each subcarrier according to a reception quality measurement such as the signal-to-noise ratio (SNR) on a subcarrier. This process allocates different bits to subcarriers and is further known at the literature as bit loading. In the paper, a bit-loading algorithm has been modified to take into account the presence of variable location pilots in each OFDM symbol. The target of this enhancement is to measure the system performance increase and the bandwidth efficiency improvement obtained. The study has been done for a broadband fixed wireless system.

Keywords

OFDM modulation; adaptive modulation; broadband networks; radio access networks; 10.5 GHz; 5.8 GHz; OFDM fixed wireless access system; bandwidth efficiency improvement; bit-loading algorithm; broadband fixed wireless system; modulation schemes; multicarrier modulation techniques; reception quality measurement; signal-to-noise ratio; subcarrier; system performance increase; Bandwidth; Channel capacity; Costs; Electric variables measurement; Fading; Iterative algorithms; Modulation coding; OFDM modulation; Signal to noise ratio; System performance;

fLanguage

English

Publisher

ieee

Conference_Titel

System Theory, 2002. Proceedings of the Thirty-Fourth Southeastern Symposium on

ISSN

0094-2898

Print_ISBN

0-7803-7339-1

Type

conf

DOI

10.1109/SSST.2002.1027088

Filename

1027088