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

• Published in: IEEE journal on selected areas in communications Vol. 19; no. 8; pp. 1544 - 1555
• Main Authors: Tulino, A.M., Verdu, S.
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.08.2001; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Approximation; Asymptotic properties; Binary phase shift keying; Decorrelation; Demodulation; Detectors; Fading; Linear receivers; Modulation; Multiaccess communication; Multiple access interference; Noise levels; Phase modulation; Phase shift keying; Quadrature phase shift keying; Receivers; Symmetric matrices
• ISSN: 0733-8716; 1558-0008
• DOI: 10.1109/49.942516

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.