Proposal of Grouping Adaptive Modulation Method for Burst Mode OFDM Transmission System

Yuanrun TENG  Tomotaka NAGAOSA  Kazuo MORI  Hideo KOBAYASHI  

IEICE TRANSACTIONS on Communications   Vol.E86-B   No.1   pp.257-265
Publication Date: 2003/01/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Multiple Access and Signal Transmission Techniques for Future Mobile Communications)
OFDM,  wireless LAN,  multi-path fading,  adaptive modulation,  Walsh-Hadamard,  

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This paper proposes an Orthogonal Frequency Division Multiplexing system with Grouping Adaptive Modulation method (GAM-OFDM). The salient feature of the proposed system is to enable the reduction of required transmission bits for adaptive modulation information (AMI) that is required in the demodulation process at the receiver. This paper also proposes an efficient AMI transmission method for the GAM-OFDM system to enable the efficient transmission of AMI bits by using only two preamble symbols, and the Multi-Carrier Spectrum Spreading (MC-SS) technique to achieve the excellent performance of AMI transmission even under severe multi-path fading environments. This paper presents the various computer simulation results to verify the performance of proposed GAM-OFDM system.