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Optimum asymptotic multiuser efficiency of randomly spread CDMA

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2 Author(s)
Tse, D.N.C. ; Dept. of Electr. Eng. & Comput. Sci., California Univ., Berkeley, CA, USA ; Verdu, S.

This correspondence analyzes the high signal-to-noise ratio (SNR) performance of optimum multiuser detectors for synchronous direct-sequence spread spectrum with random spreading in an additive white Gaussian noise channel. Under very general conditions on the received powers, we show that the optimum asymptotic efficiency of a K-user system with spreading gain N converges to 1 almost surely as K→∞, and K/N is kept equal to an arbitrary nonzero constant. Therefore, the asymptotic behavior of the minimum bit error rate is equivalent to that of a single-user system

Published in:

Information Theory, IEEE Transactions on  (Volume:46 ,  Issue: 7 )

Date of Publication:

Nov 2000

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