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Optimal sequences for asynchronous CDMA channels with different SIR requirements

: Boche, H.; Stanczak, S.


Matthews, M.B. ; Naval Postgraduate School, Monterey/Calif.:
Thirty-Fifth Asilomar Conference on Signals, Systems & Computers 2001. Conference Record. Vol.1 : November 4 - 7, 2001, Pacific Grove, California
Piscataway: IEEE Operations Center, 2001
ISBN: 0-7803-7147-X
ISBN: 0-7803-7148-8
Asilomar Conference on Signals, Systems & Computers <35, 2001, Pacific Grove/Calif.>
Fraunhofer HHI ()
code division multiple access; matched filters; optimisation; radio receivers; resource allocation; telecommunication channels; asynchronous cdma channels; sir requirements; admissibility; single-user matched filters; power allocation; optimization; multiuser receiver; sequence allocation

We address the problem of admissibility in an asynchronous CDMA (A-CDMA) channel equipped with a bank of single-user matched filters. We say that a set of users is admissible in a CDMA channel if one can assign sequences to the users and control their power so that each user meets its signal-to-interference-plus-noise ratio (SINR) requirement. We identify a power allocation that solves a closely related problem. This problem is equivalent to the problem of admissibility if all users have the same SINR requirements. We show when both problems are equivalent in a general case. We provide criteria for optimizing correlation properties of sequences and prove a necessary condition for admissibility of the users.