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Efficient Techniques in OFDM System with Channel Evaluation
So-Young YEO Jae-Seon YOON Myung-Sun BAEK Young-Hwan YOU Hyoung-Kyu SONG
IEICE TRANSACTIONS on Communications
Publication Date: 2006/10/01
Online ISSN: 1745-1345
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
OFDM, SNR estimation, pre-equalization, adaptive modulation, banded adaptive modulation,
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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.