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Joint multipath-Doppler diversity in mobile wireless communications

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2 Author(s)
Sayeed, A.M. ; Dept. of Electr. & Comput. Eng., Wisconsin Univ., Madison, WI, USA ; Aazhang, B.

We introduce a new approach for achieving diversity in spread-spectrum communications over fast-fading multipath channels. The RAKE receiver used in existing systems suffers from significant performance degradation due to the rapid channel variations encountered under fast fading. We show that the Doppler spread induced by temporal channel variations in fact provides another means for diversity that can be further exploited to combat fading. We develop the concept of Doppler diversity and propose a framework that exploits joint multipath-Doppler diversity in an optimal fashion. Performance analysis shows that even the relatively small Doppler spreads encountered in practice can be leveraged into significant diversity gains via our approach. The framework is applicable in several mobile wireless multiple access systems and can provide substantial performance improvement over existing systems

Published in:

Communications, IEEE Transactions on  (Volume:47 ,  Issue: 1 )

Date of Publication:

Jan 1999

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