Journal ArticleDOI
Robust adaptive recovery of spread-spectrum signals with short data records
TLDR
Numerical and simulation studies under finite-data-record system adaptation show significant improvement in bit-error-rate performance over the conventional linear minimum variance-distortionless-response (MVDR) SS receiver or conventional MVDR filtering preceded by vector adaptive chip-based nonlinear processing.Abstract:
The problem under consideration is the adaptive reception of a multipath direct-sequence spread-spectrum (SS) signal in the presence of unknown correlated SS interference and additive impulsive noise. An SS receiver structure is proposed that consists of a vector of adaptive chip-based Hampel nonlinearities followed by an adaptive auxiliary-vector linear tap-weight filter. The nonlinear receiver front end adapts itself to the unknown prevailing noise environment providing robust performance over a wide range of underlying noise distributions. The adaptive auxiliary-vector linear tap-weight filter allows rapid SS interference suppression with a limited data record. Numerical and simulation studies under finite-data-record system adaptation show significant improvement in bit-error-rate performance over the conventional linear minimum variance-distortionless-response (MVDR) SS receiver or conventional MVDR filtering preceded by vector adaptive chip-based nonlinear processing.read more
Citations
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Journal ArticleDOI
Data record-based criteria for the selection of an auxiliary vector estimator of the MMSE/MVDR filter
Haoli Qian,Stella N. Batalama +1 more
TL;DR: Two data-record based criteria for the selection of an auxiliary-vector (AV) estimator from the sequence of AV estimators of the minimum variance distortionless response (MVDR) filter are proposed.
Journal ArticleDOI
Robust CDMA multiuser detection using a neural-network approach
TL;DR: The use of a three-layer recurrent neural network (RNN) to implement the LDD without requiring matrix inversion is demonstrated and it will be shown that the M-decorrelating detector (MDD) can be implemented by simply incorporating sigmoidal neurons in the first layer of the RNN.
Journal ArticleDOI
Rapid combined synchronization/demodulation structures for DS-CDMA systems. I. Algorithmic developments
TL;DR: Two computationally efficient combined synchronization/demodulation schemes are proposed, developed, and analyzed based on the principles of minimum-variance distortionless-response processing and auxiliary-vector filtering, which exhibits enhanced performance in short data-record scenarios.
Improved Robust Techniques for Multiuser Detection in Non
TL;DR: An improved robust blind multiuser detection technique based on a subspace approach, which requires only the signature waveform and the timing of the desired user to demodulate that user's signal, and can be applied to both synchronous and asynchronous CDMA channels.
Journal ArticleDOI
Improved Robust Techniques for Multiuser Detection in Non-Gaussian Channels
T. Anil Kumar,K. Deergha Rao +1 more
TL;DR: In this paper, a robust multiuser detector for combating multiple access interference and impulsive noise in code division multiple access (CDMA) communication systems is proposed, which is corroborated with simulation results.
References
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Journal ArticleDOI
An alternative approach to linearly constrained adaptive beamforming
L.J. Griffiths,C. Jim +1 more
TL;DR: A beamforming structure is presented which can be used to implement a wide variety of linearly constrained adaptive array processors and is shown to incorporate algorithms which have been suggested previously for use in adaptive beamforming as well as to include new approaches.
Journal ArticleDOI
Linear multiuser detectors for synchronous code-division multiple-access channels
R. Lupas,Sergio Verdu +1 more
TL;DR: Under the assumptions of symbol-synchronous transmissions and white Gaussian noise, the authors analyze the detection mechanism at the receiver, comparing different detectors by their bit error rates in the low-background-noise region and by their worst-case behavior in a near-far environment.
Journal ArticleDOI
MMSE interference suppression for direct-sequence spread-spectrum CDMA
Upamanyu Madhow,Michael L. Honig +1 more
TL;DR: It is concluded that MMSE detectors can alleviate the need for stringent power control in CDMA systems, and may be a practical alternative to the matched filter receiver.
Journal ArticleDOI
Blind adaptive multiuser detection
TL;DR: This paper introduces an adaptive multiuser detector which converges (for any initialization) to the MMSE detector without requiring training sequences and is made robust to imprecise knowledge of the received signature waveform of the user of interest.
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