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Noncoherent Unitary Space-Time Modulated DSSS Systems in Multipath Channels  

Cheun, Kyung-Whoon (Division of Information Technology Convergence Engineering, POSTECH)
Kim, Jeong-Chang (Department of Electronics and Communications Engineering, Korea Maritime University)
Kim, You-Han (Amicus Wireless Technology, Inc.)
Choi, Soong-Yoon (Samsung Electronics Co., Ltd.)
Publication Information
Journal of Communications and Networks / v.14, no.2, 2012 , pp. 206-212 More about this Journal
Abstract
In this paper, in order to effectively apply unitary space-time modulation to the direct-sequence spread-spectrum multiple-access (DSSS-MA) networks, we propose a low-rate, noncoherent, unitary, and space-time modulated DSSS system supporting any number of transmit antennas based on Walsh matrices. The proposed scheme simultaneously performs bandwidth spreading and space-time coding and outperforms those using high-rate, conventional unitary space-time constellations. Furthermore, the proposed scheme allows for a simple detector structure based on fast Walsh transforms.
Keywords
Direct-sequence spread-spectrum (DSSS); noncoherent; transmit diversity; unitary space-time modulation;
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