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Asymptotic analysis of improved linear receivers for BPSK-CDMA subject to fading

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2 Author(s)
Tulino, A.M. ; Dept. of Electr. Eng., Princeton Univ., NJ, USA ; Verdu, S.

In this paper, we design and analyze a new class of linear multiuser detectors, which can be applied when the users employ BPSK modulation and the fading coefficients of the active users are known at the receiver (such as base-station demodulation). The tools of asymptotic distribution of the spectrum of large random matrices are used to show that relative to the classical minimum mean-square-error (MMSE) receiver, the output signal-to-noise ratio (SNR) improves by halving the number of effective interferers and adding 3 dB to the input SNR. We also propose sensible approximations to the proposed linear receivers so as to facilitate their use in CDMA systems that employ long codes

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Selected Areas in Communications, IEEE Journal on  (Volume:19 ,  Issue: 8 )