Novel Array Antenna Assisted Adaptive Modulation Scheme for Fast Fading Channel

Tomotaka WADA
Minoru OKADA
Heiichi YAMAMOTO

Publication
IEICE TRANSACTIONS on Communications   Vol.E88-B    No.8    pp.3383-3392
Publication Date: 2005/08/01
Online ISSN: 
DOI: 10.1093/ietcom/e88-b.8.3383
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
Keyword: 
adaptive modulation,  fast fading,  array antenna,  Doppler spread compensator,  BER,  throughput,  

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Summary: 
In this paper, we propose a novel array antenna-assisted adaptive modulation scheme for fast fading environments. Although adaptive modulation is an efficient technique capable of establishing high bit-rate digital transmission in a multi-path fading environment, it is sensitive to the fast time variation of the channel because of difficulties in tracking the channel state. To resolve this problem, an array antenna-based Doppler spread compensator was applied to the adaptive modulation scheme. Computer simulation results indicated that the proposed scheme can markedly improve the bit error rate and throughput performance for the region in which the maximum Doppler frequency normalized by the packet length is up to 0.1.