Alle-Jan van der Veen

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1.1 INTRODUCTION As demonstrated in other chapters in this book, the deployment of multiple antennas at the transmit and receive side (multiple-input multiple-output (MIMO)) can result in a significant capacity increase. This is due to two effects: (i) diversity, i.e., robustness against fading of the channel between a transmit and a receive antenna, and(More)
Two unknown non-white stochastic sources (e.g. speech signals) are dynamically mixed by an unknown multi-path channel and subsequently measured by two sensors. The objective is to construct an inverse lter that separates the two signals, based only on their independence. It is known that, under certain conditions, second-order statistics provide suucient(More)
In many cases where direction nding is of interest, the signals impinging on an antenna array are known to be phase modulated, hence to have a constant mod-ulus (CM). This is a strong property, by itself already suucient for source separation, and can be used to construct improved direction nding algorithms. We rst present the relevant Cramer-Rao bounds for(More)
In multiuser multiantenna communication receivers, the use of high resolution ADCs is costly. In the presence of (strong) interference, more bits are used than would be necessary for quantizing only the signal of interest. Thus, if it is possible to cancel the interference in the analog domain, considerable savings can be realized. In this paper, we exploit(More)
Consider estimating the parameters of polynomial phase signals observed by an antenna array given that the array manifold is unknown (e.g., uncalibrated array). To date, only an approximated maximum likelihood estimator (AMLE) was suggested, however, it involves a multidimensional search over the entire coefficient space. Instead, we propose a two-step(More)
This paper examines a beamforming approach towards reducing the power consumption in oversampling sigma delta (ΣΔ) analog to digital converters (ADC's) for multiuser antenna array communication systems. We propose a setup where the output of the ADC's are fed-back to the input of a ΣΔ modulator through a beamformer to cancel the(More)
In this paper, we derive the Cramér-Rao bound (CRB) for range estimation, which does not only exploit the range information in the time delay, but also in the amplitude of the received signal. This new bound is lower than the conventional CRB that only makes use of the range information in the time delay. We investigate the new bound in an additive(More)
| Deterministic blind beamforming algorithms try to separate superpositions of source signals impinging on a phased antenna array, by using deterministic properties of the signals or the channels such as their constant modulus or directions-of-arrival. Unlike optimal or adaptive methods, the algebraic methods discussed in this review act on a xed block of(More)
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