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Title: A new pre-processing technique to enhance single-user-type DS-CDMA detectors in "blind" space-time rake receivers
Authors: Wong, KT 
Tichavsky, P
Cheung, SK
Liao, G
Keywords: Antenna arrays
Array signal processing
Communication system performance
Inter-symbol interference
Interference suppression
Land mobile radio diversity systems
Mobile communication
Pseudo-noise coded communication
Spread spectrum communication
Issue Date: 2006
Publisher: Institute of Electrical and Electronics Engineers
Source: IEEE transactions on wireless communications, 2006, v. 5, no. 10, 1705955, p. 2932-2944 How to cite?
Journal: IEEE transactions on wireless communications 
Abstract: Proposed herein is a pre-processing technique applicable to maximum-SINR beamformers for "blind" space-time rake receivers in "single-user"-type DS-CDMA detection. This smart-antennas signal-processing technique enhances the constructive summation of multipaths and the rejection of co-channel interference, both of which decrease the bit-error-rate and lower the error-floor of the cellular uplink's near-far problem at high SNR. This technique is "blind" in that it needs neither prior knowledge nor explicit estimation of (1) the channel-faded multipaths' arrival angles, relative arrival delays or power profiles, (2) the receiving antenna array's nominal or actual gain-phase-polarization response, and (3) the co-channel multi-access users' signature-spreading codes. Monte Carlo simulations show that the proposed scheme can enhance the output-SINR by 1-10 dB. A mathematical analysis shows this proposed pre-processing scheme to always improve the asymptotic output-SINR. A formula is analytically derived to predict this asymptotic output-SINR. This formula lies within 7dB of limited simulation results at an input-SIR above -7dB and a chip-rate space time-sampling, but the formula is less accurate otherwise.
ISSN: 1536-1276
DOI: 10.1109/TWC.2006.04741
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