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Noncoherent unitary space-time modulated DSSS systems in multipath channels

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4 Author(s)
Kyungwhoon Cheun ; Div. of Inf. Technol. Convergence Eng., POSTECH, Pohang, South Korea ; Jeongchang Kim ; Youhan Kim ; Soongyoon Choi

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.

Published in:

Communications and Networks, Journal of  (Volume:14 ,  Issue: 2 )