New pre-processing technique to enhance single-user-type DS-CDMA detectors in "blind" space-time rake receivers

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...

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Bibliographic Details
Published in:IEEE transactions on wireless communications 2006-10, Vol.5 (10), p.2932-2944
Main Authors: Wong, K.T., Tichavsky, P., Cheung, S.K., Liao, G.
Format: Article
Language:English
Subjects:
Antenna arrays
Antennas
Applied sciences
Asymptotic properties
Blinds
Computer simulation
Delay estimation
Detectors
Equipments and installations
Exact sciences and technology
Fading
Interchannel interference
Mathematical analysis
Mobile radiocommunication systems
Monte Carlo methods
Multiaccess communication
Multipath channels
Noise levels
Radiocommunications
Rakes
Receivers
Receiving antennas
Signal detection
Studies
Systems, networks and services of telecommunications
Telecommunications
Telecommunications and information theory
Transmission and modulation (techniques and equipments)
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Summary: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 1 dB of limited simulation results at an input-SIR above -7 dB and a chip-rate space time-sampling, but the formula is less accurate otherwise
ISSN:1536-1276
1558-2248
DOI:10.1109/TWC.2006.04741