Directive Antenna Diversity Reception Scheme for an Adaptive Modulation System in High Mobility Land Mobile Communications

Takashi SUZUKI  Seiichi SAMPEI  Norihiko MORINAGA  

Publication
IEICE TRANSACTIONS on Communications   Vol.E79-B   No.3   pp.335-341
Publication Date: 1996/03/25
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Advanced Adaptive Radio Communication Technologies)
Category: Modulation, Demodulation
Keyword: 
adaptive modulation system,  directive antenna diversity,  land mobile communication,  channel condition estimation,  

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Summary: 
This paper proposes a directive antenna diversity reception scheme for an adaptive modulation/time division multiple access (TDMA)/time division duplex (TDD) system to achieve high quality, high bit rate and high spectral efficient data transmission in high mobility land mobile communication environments. In mobile stations, a directive antenna is applied to equivalently reduce the observed variation speed of the fading channel. At each branch, the offset frequency (foff) and foff-canceled fading variation are estimated to improve accuracy of the propagation path characteristics estimation even in high maximum Doppler frequency (fd) environments. Computer simulation confirms that the proposed scheme can achieve successful variable rate transmission in fast fading environments.