Efficient Techniques in OFDM System with Channel Evaluation

So-Young YEO  Jae-Seon YOON  Myung-Sun BAEK  Young-Hwan YOU  Hyoung-Kyu SONG  

Publication
IEICE TRANSACTIONS on Communications   Vol.E89-B   No.10   pp.2945-2948
Publication Date: 2006/10/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e89-b.10.2945
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
Keyword: 
OFDM,  SNR estimation,  pre-equalization,  adaptive modulation,  banded adaptive modulation,  

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Summary: 
In this letter, we aim at the study of an OFDM system that employs adaptive modulation techniques to achieve efficient transmission service. In adaptive modulation techniques, a banded AM technique can reduce the number of adaptive modulation information bits and signaling overhead. We evaluate the banded AM technique and compare with Subcarrier AM technique. Moreover, to evaluate the channel condition, we apply the SNR estimation method. Furthermore, to increase the performance of OFDM system, frequency domain pre-equalization is applied. The simulation results have been shown that the OFDM system with adaptive schemes can achieve the efficient transmission for multi-media services.