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检索条件"机构=Institute of Circuit Theory and Signal Processing"

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Throughput Maximization for Energy Harvesting Receivers

Throughput Maximization for Energy Harvesting Receivers

引用

WSA 2013;17th International ITG Workshop on Smart Antennas

作者： Qing Bai Amine Mezghani Josef A. Nossek Institute for Circuit Theory and Signal Processing Technische Universitat Munchen

We investigate in this work the optimal control strategies of a receiver that is powered by the ambient energy it harvests over time. Two scenarios are mainly considered, the single-antenna system with non-fading channel, and the multiantenna system with fading channel. The throughput achieved on the limited time slot [ 0, T ] is maximized with respect to the resolution of the A/D converter and the transmission bandwidth/ number of antennas. To this end, the receiver is assumed to have full, non-causal knowledge about the energy arriving process, and the transmitter is assumed to be in full cooperation with the receiver. Convexity of the formulated optimizations is discussed, and the optimal control theory is applied for finding the optimal state trajectories of the system. Numerical simulations are performed for the analysis of the optimal control variables, as well as for the comparison of throughput achieved with different channel gains and optimizations.

关键词： Receivers Throughput analog digital converter Fading channels theory of optimal control energy harvesting control strategy ANTENNA Optimal control Transmitters

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On the Optimization of ADC Resolution in Multi-antenna Systems

On the Optimization of ADC Resolution in Multi-antenna Syste...

引用

ISWCS 2013;The Tenth International Symposium on Wireless Communication Systems

作者： Qing Bai Amine Mezghani Josef A. Nossek Institute for Circuit Theory and Signal Processing Teehnisehe Universitat Munehen

The analog-to-digital converter (ADC) at the front end of a receiver not only affects the achievable communication rates but also the power consumption of the receiver. With higher resolution of the ADC, less quantization loss is incurred due to the conversion, leading to a higher communication rate, yet more power is dissipated by the ADC which increases the total energy consumption of the receiver. Such a trade-off is especially important for the energy-efficient design of a receiver with multiple antennas. We investigate the joint optimization of ADC resolutions in a multi-antenna system with perfect channel state information at the receiver. The formulated maximization problem of the bit per .louie metric is an integer programming for which we apply the particle swarm optimization (PSO) method to find near-optimal solutions with low complexity. Simulation results demonstrate the necessity for performing such optimizat ions, with improved energy-efficiency compared to the common design of using uniform ADC resolutions.

关键词： analog digital converter multiple antenna Power consumption Receivers front-ends Channel state information Integer Programming ANTENNA SYSTEM energy-efficient design Energy efficiency total energy consumption High definition

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QUANTIZATION-LOSS REDUCTION FOR signal PARAMETER ESTIMATION

QUANTIZATION-LOSS REDUCTION FOR SIGNAL PARAMETER ESTIMATION

引用

IEEE International Conference on Acoustics, Speech, and signal processing

作者： Manuel Stein Friederike Wendler Amine Mezghani Josef A. Nossek Institute for Circuit Theory and Signal Processing Technische Universitat Munchen

ISBN: (纸本)9781479903573

Using coarse resolution analog-to-digital conversion (ADC) offers the possibility to reduce the complexity of digital receive systems but introduces a loss in effective signal-to-noise ratio (SNR) when comparing to ideal receivers with infinite resolution ADC. Therefore, here the problem of signal parameter estimation from a coarsely quantized receive signal is considered. In order to increase the system performance, we propose to adjust the analog radio front-end to the quantization device in order to reduce the quantization-loss. By optimizing the bandwidth of the analog filter with respect to a weighted form of the Cramer-Rao lower bound (CRLB), we show that for low SNR and a 1-bit hard-limiting device it is possible to significantly reduce the quantization-loss of initially -1.96 dB. As application, joint carrier-phase and time-delay estimation for satellite-based positioning and synchronization is discussed. Simulations of the maximum-likelihood estimator (MLE) show that the optimum estimator achieves the same quantization-loss reduction as predicted by the performance bound of the optimized system.

关键词： Analog-to-digital conversion Parameter estimation Analog filtering Satellite navigation systems

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Interference Temperature Analysis in a Large Scale Cellular System

Interference Temperature Analysis in a Large Scale Cellular ...

引用

WSA 2013;17th International ITG Workshop on Smart Antennas

作者： Hans H. Brunner Josef A. Nossek Institute for Circuit Theory and Signal Processing Technische Universitat Munchen

We consider the downlink of a cellular network with cooperative multiple antenna base stations and single antenna user terminals. Based on a limited number of measured interference channels and an interference prediction strategy, we address the implementation of interference temperatures in a large scale system. With interference temperatures, each base station has linear constraints on its transmit covariance matrix. These constraints limit the intercell interference at mobile devices in other cells to a certain level.

关键词： inter-cell interference BASE STATION large-scale systems Interference channels temperature evaluation cellular system Mobile devices variance covariance matrix interference prediction interference interference Cellular networks

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Optimizing the Number of Feedback Users

Optimizing the Number of Feedback Users

引用

WSA 2013;17th International ITG Workshop on Smart Antennas

作者： Mario H. Castaneda Sebastian Theiler Josef A. Nossek Institute for Circuit Theory and Signal Processing Technische Universitat Munchen

In a multiuser broadcast channel with M antennas at the base station and K = M i.i.d. users, multiuser diversity can be exploited by optimally choosing a set of M users to serve simultaneously with linear beamforming. In order to perform the user selection, the base station requires channel state information (CSI) of all K users which is obtained through limited feedback in frequency division duplex (FDD) systems. In this work we assume the feedback consists solely of the channel direction information (CDI) of the users. Although most of the literature assumes a per-user limited feedback, a constraint on the system limited feedback is actually more appropriate. Given a constraint on the total amount of channel uses reserved for the feedback of all the users, we experience a tradeoff between the attainable degree of multiuser diversity and the CDI feedback quality. The optimum number of feedback users are determined based on a closed-form approximation of a lower bound on the sum rate achieved with user selection. It is shown that the optimum number of feedback users increases linearly with the total amount of channel uses reserved for the feedback of all the users.

关键词： Feedback Consumers optimum number BASE STATION

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Modulation and Coding Optimization for Energy Harvesting Transmitters

Modulation and Coding Optimization for Energy Harvesting Tra...

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SCC 2013;9th International ITG Conference on Systems, Communication and Coding

作者： Qing Bai Josef A. Nossek Institute for Circuit Theory and Signal Processing Technische Universitat Munchen

Energy harvesting communication devices, which are able to convert different forms of ambient energy to electrical energy and use it for communications, have emerged as an alternative to the conventional devices powered by fixed utilities or batteries, due to their potential to be deployed in less accessible environments and to operate for longer time without any human intervention. As the energy input to such systems is in general non-constant, new resource management principles and resource allocation algorithms need to be developed. In this work, we evaluate the performance limit of energy harvesting transmitters in terms of throughput when only discrete modulation levels and coding rates are applicable, assuming perfect knowledge of energy arrivals and constant channel state during the time slot of interest. In addition, we employ a detailed circuit power model to account for the energy consumption within the transmitter circuitry. A throughput-maximizing energy expenditure trajectory can be obtained with the construction algorithm we propose which utilizes the Pareto boundary of the system on the powerrate graph, and it corresponds to an optimal adaptive modulation and coding strategy that the transmitter should employ.

关键词： Trajectory Transmitters Power demand Energy harvesting Throughput Modulation Integrated circuit modeling

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EM based Per-Subcarrier ML Channel Estimation for Filter Bank Multicarrier Systems

EM based Per-Subcarrier ML Channel Estimation for Filter Ban...

引用

ISWCS 2013;The Tenth International Symposium on Wireless Communication Systems

作者： Leonardo G. Baltar Amine Mezghani Josef A. Nossek Institute for Circuit Theory and Signal Processing Technische Universitat Munchen

Filter bank based multicarrier (FBMC) systems present an alternative solution to cyclic prefix based orthogonal frequency division multiplexing (CP-OFDM) in wireless environments with multipath propagation. In this contribution, we propose a novel method of per-subcarrier maximum likelihood (ML) narrowband channel estimation as an extension of the scheme recently developed by the same authors. The main difference is that our new estimation method assumes that only the training sequence transmitted in the observed subcarrier is known and unknown data symbols are transmitted in the two immediately adjacent subcarriers. The method is based on the expectation maximization (EM) algorithm and allows iteratively to converge to the ML solution. The main advantage of the method is the increase in the spectral efficiency, since less subcarriers need to be filled with training symbols. Our simulation results show that if enough training and number of iterations are employed, a similar performance to the original ML algorithm, where the 3 subcarriers are filled with training, can be achieved.

关键词： Subcarriers Computer Programming Languages Training Statistical analysis cyclic prefix Multipath propagation spectral efficiency Banks iterative methods Filter banks Filters channel estimation based Signs and symbols Orthogonal frequency division multiplexing

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Quantization-Loss Analysis for Array signal-Source Localization

Quantization-Loss Analysis for Array Signal-Source Localizat...

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WSA 2013;17th International ITG Workshop on Smart Antennas

作者： Manuel Stein Amine Mezghani Josef A. Nossek Institute for Circuit Theory and Signal Processing Technische Universitat Munchen

This work investigates the problem of low SNR signal-source localization with an array of sensors. Keeping the receive system simple, we focus on analog-to-digital converters (ADC) with coarse resolution. In order to increase the localization accuracy and minimize the size of the receiver, we discuss the effect of analog filtering and antenna spacing on the Fisher information measure. In particular, the beneficial influence of temporal and spatial noise correlation produced by the analog receive filter and antenna coupling is considered. Results for the extreme case of 1-bit hard-limiting quantizers show that it is possible to compensate the quantization-loss of the optimum unbiased estimator through the correct choice of the analog frontend and antenna design. Further, our investigation shows that for array receivers high resolution parameter estimation is still possible with antenna spacings far below lambda=2.

关键词： 1-bit hard-limiter signal parameter estimation Antenna mutual coupling Analog filtering analogue filter ANTENNA antennae Position measurement Fisher information analog digital converter extreme case Receivers arrays front-ends

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Reactive accent interpolation through an interactive map application 8

Reactive accent interpolation through an interactive map app...

引用

8th ISCA Tutorial and Research Workshop on Speech Synthesis, SSW 2013

作者： Astrinaki, Maria Yamagishi, Junichi King, Simon D'Alessandro, Nicolas Dutoit, Thierry Circuit Theory and Signal Processing Lab Numediart Institute University of Mons Belgium The Centre for Speech Technology Research University of Edinburgh Edinburgh United Kingdom National Institute of Informatics Tokyo Japan

MAGE enables the reactive and continuous models modification in the HMM-based speech synthesis framework. Here, we present our first prototype system for extended interpolation applied for interactive accent control. Available accent models for American, Canadian and British English are manipulated in realtime by means of a gesturally controlled interactive geographical map. The accent interpolation is applied to one gender at a time, but the user is able to reactive alter between genders, while controlling the speakers to be interpolated at a time. © SSW 2013. All rights reserved.

关键词： Speech synthesis

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Mage - HMM-based speech synthesis reactively controlled by the articulators 8

Mage - HMM-based speech synthesis reactively controlled by t...

引用

8th ISCA Tutorial and Research Workshop on Speech Synthesis, SSW 2013

作者： Astrinaki, Maria Moinet, Alexis Yamagishi, Junichi Richmond, Korin Ling, Zhen-Hua King, Simon Dutoit, Thierry Circuit Theory and Signal Processing Lab Numediart Institute University of Mons Belgium The Centre for Speech Technology Research University of Edinburgh Edinburgh United Kingdom National Institute of Informatics Tokyo Japan China

In this paper, we present the recent progress in the MAGE project. MAGE is a library for realtime and interactive (reactive) parametric speech synthesis using hidden Markov models (HMMs). Here, it is broadened in order to support not only the standard acoustic features (spectrum and f0) to model and synthesize speech but also to combine acoustic and articulatory features, such as tongue, lips and jaw positions. Such an integration enables the user to have a straight forward and meaningful control space to intuitively modify the synthesized phones in real time only by configuring the position of the articulators. © SSW 2013. All rights reserved.

关键词： Speech synthesis

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