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IEICE Transactions on Communications 2005 E88-B(8):3383-3392; doi:10.1093/ietcom/e88-b.8.3383
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Copyright © 2005 The Institute of Electronics, Information and Communication Engineers

Regular Section -- Papers -- Wireless Communication Technologies

Novel Array Antenna Assisted Adaptive Modulation Scheme for Fast Fading Channel

Tomotaka WADA1, Minoru OKADA2 and Heiichi YAMAMOTO2

1 The author is with the Faculty of Systems Engineering, Wakayama University, Wakayama-shi, 640-8510 Japan. E-mail: wada{at}sys.wakayama-u.ac, 2 The authors are with the Graduate School of Information Science, Nara Institute of Science and Technology, Ikoma-shi, 630-0192 Japan.

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.

Key Words: adaptive modulation, fast fading, array antenna, Doppler spread compensator, BER, throughput

Manuscript received September 21, 2004. Manuscript revised February 7, 2005.


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[Abstract] [PDF]


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