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A novel scheme for linear multiuser detection in asynchronous DS-CDMA systems with frequency selective fading

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2 Author(s)
Uzmi, Z.A. ; Dept. of Electr. Eng., Stanford Univ., CA, USA ; Mujtaba, S.A.

A novel scheme for linear multiuser detection (MUD) based on sub-symbol diversity is presented that is applicable to asynchronous CDMA systems with frequency selective fading. Traditional solutions for asynchronous linear MUD result in a prohibitively large decorrelation matrix. The new scheme transforms the asynchronous problem into a synchronous one by creating sub-symbols that are, by design, time-aligned with all other users and their respective multipath signals. The resulting decorrelation matrix is dramatically reduced in size, thus offering a viable solution for implementation. We also present an optimal scheme for combining the sub-symbols that is based on the condition number of the decorrelation matrices

Published in:

Global Telecommunications Conference, 1999. GLOBECOM '99  (Volume:1B )

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