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

共 381 条记录，以下是21-30 订阅

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Performance analysis for pilot-based 1-bit channel estimation with unknown quantization threshold

Performance analysis for pilot-based 1-bit channel estimatio...

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International Conference on Acoustics, Speech, and signal processing (ICASSP)

作者： Manuel Stein Shahar Bar Josef A. Nossek Joseph Tabrikian Institute for Circuit Theory and Signal Processing Technische Universität München Germany Department of Electrical and Computer Engineering Ben-Gurion University of the Negev Israel

ISBN: (纸本)9781479999897

Parameter estimation using quantized observations is of importance in many practical applications. Under a symmetric 1-bit setup, consisting of a zero-threshold hard-limiter, it is well known that the large sample performance loss for low signal-to-noise ratios (SNRs) is moderate (2/Π or -1.96dB). This makes low-complexity analog-to-digital converters (ADCs) with 1-bit resolution a promising solution for future wireless communications and signal processing devices. However, hardware imperfections and external effects introduce the quantizer with an unknown hard-limiting level different from zero. In this paper, the performance loss associated with pilot-based channel estimation, subject to an asymmetric hard limiter with unknown offset, is studied under two setups. The analysis is carried out via the Cramér-Rao lower bound (CRLB) and an expected CRLB for a setup with random parameter. Our findings show that the unknown threshold leads to an additional information loss, which vanishes for low SNR values or when the offset is close to zero.

关键词： signal to noise ratio Quantization (signal) Receivers Maximum likelihood estimation Channel estimation Erbium

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Measurement-driven quality assessment of nonlinear systems by exponential replacement

Measurement-driven quality assessment of nonlinear systems b...

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IEEE Instrumentation and Measurement Technology Conference

作者： Manuel Stein Josef A. Nossek Kurt Barbé Institute for Circuit Theory and Signal Processing (NWS) Technische Universität München Germany Dept. Mathematics (DWIS) Vrije Universiteit Brussel Belgium

ISBN: (纸本)9781467392211

We discuss the problem how to determine the quality of a nonlinear system with respect to a measurement task. Due to amplification, filtering, quantization and internal noise sources physical measurement equipment in general exhibits a nonlinear and random input-to-output behaviour. This usually makes it impossible to accurately describe the underlying statistical system model. When the individual operations are all known and deterministic, one can resort to approximations of the input-to-output function. The problem becomes challenging when the processing chain is not exactly known or contains nonlinear random effects. Then one has to approximate the output distribution in an empirical way. Here we show that by measuring the first two sample moments of an arbitrary set of output transformations in a calibrated setup, the output distribution of the actual system can be approximated by an equivalent exponential family distribution. This method has the property that the resulting approximation of the statistical system model is guaranteed to be pessimistic in an estimation theoretic sense. We show this by proving that an equivalent exponential family distribution in general exhibits a lower Fisher information measure than the original system model. With various examples and a model matching step we demonstrate how this estimation theoretic aspect can be exploited in practice in order to obtain a conservative measurement-driven quality assessment method for nonlinear measurement systems.

关键词： Biomedical measurement Nonlinear systems Estimation Rician channels Numerical models signal processing Analytical models

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Frequency-domain analysis of linear periodically time-varying FBMC systems

Frequency-domain analysis of linear periodically time-varyin...

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Sensor Array and Multichannel signal processing Workshop

作者： Tobias Laas Leonardo G. Baltar Josef A. Nossek Institute for Circuit Theory and Signal Processing Technische Universität München München Germany Next Generation and Standards Intel Deutschland GmbH Neubiberg Germany

ISBN: (纸本)9781509021048

We study how to analyze Linear Periodically Time-Varying (LPTV) Filter Bank Based Multi-Carrier (FBMC) transmitters with Offset QAM (OQAM) modulation. Using an approach based on the Bifrequency Map and the Power Spectral Density (PSD), we can derive a Pseudo-Transfer Function for each subcarrier in the steady-state, taking the upsampling into account. Furthermore, we show that the magnitude of the Pseudo-Transfer Function can be expressed as the average magnitude of Linear Time Invariant (LTI) transfer functions and that an FIR LTI filter with the same magnitude as the Pseudo-Transfer Function and with the same degree as the LPTV filter exists. We also present an LPTV filter fulfilling the Perfect Reconstruction (PR) conditions and apply our previous results.

关键词： Filter banks Linear systems Finite impulse response filters Convolution Delays Frequency-domain analysis Quadrature amplitude modulation

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DoA estimation performance and computational complexity of subspace- and compressed sensing-based methods 19

DoA estimation performance and computational complexity of s...

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19th International ITG Workshop on Smart Antennas, WSA 2015

作者： Stöckle, Christoph Munir, Jawad Mezghani, Amine Nossek, Josef A. Institute for Circuit Theory and Signal Processing Munich University of Technology Munich80290 Germany

ISBN: (纸本)9783800736621

We investigate the Direction of Arrival (DoA) estimation for small- and large-scale antenna arrays with a small and a large number of antenna elements, respectively. Two classes of algorithms are considered, namely subspace- and compressed sensing (CS)-based algorithms. We compare those algorithms in terms of both the DoA estimation performance and the computational complexity based on different parameters such as number of antenna elements, number of snapshots and quantization. From this comparison, we conclude that the subspace-based method ESPRIT is well suited for small-scale antenna systems while the CS-based method IHT is advantageous for large-scale antenna systems. © VDE Verlag GMBH · Berlin · Offenbach, Germany.

关键词： Compressed sensing

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Design optimization of SIMO receivers with compact uniform linear arrays and limited precision A/D conversion 19

Design optimization of SIMO receivers with compact uniform l...

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19th International ITG Workshop on Smart Antennas, WSA 2015

作者： Bai, Qing Nossek, Josef A. Institute for Circuit Theory and Signal Processing Technische Universität München Munich Germany

ISBN: (纸本)9783800736621

Antenna arrays can be made compact when the spacing between adjacent antennas is reduced to less than half of the wavelength. This facilitates the deployment of multiple antennas to communication devices that are limited in their physical dimensions, yet introduces significant spatial correlation between the channels as well as antenna mutual coupling. With careful design of a matching network at the receiver front-end, the antennas can be decoupled and superior performance can be achieved as compared to half-wavelength arrays. In this work, we investigate the design optimization of a multi-antenna receiver with a compact uniform linear array, where we try to find the optimal antenna spacing and the number of antennas that lead to the maximal channel capacity and energy efficiency of the system. Moreover, we take into account the impact of A/D conversion with limited precision, which results in a trade-off between quantization error and power consumption. Simulation results accentuate the advantage of using small compact antenna arrays and low bit resolutions for the A/D converters. © VDE Verlag GMBH · Berlin · Offenbach, Germany.

关键词： Antenna arrays

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Analysis of a near field MIMO wireless channel using 5.6 GHz dipole antennas

Analysis of a near field MIMO wireless channel using 5.6 GHz...

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ESA Workshop on Aerospace EMC

作者： Mohamed Ismaeel Maricar Gabriele Gradoni Steve Greedy Michel T Ivrlac Josef A. Nossek Sendy Phang Stephen C Creagh Gregor Tanner David W P Thomas Department of Electrical and Electronics Engineering University of Nottingham School of Mathematical Sciences University of Nottingham Institute for Circuit Theory and Signal Processing Technische Universität München Munich Germany

ISBN: (纸本)9781509013005

Understanding the impact of interference upon the performance of a multiple input multiple output (MIMO) based device is of paramount importance in ensuring a design is both resilient and robust. In this work the effect of element-element interference in the creation of multiple channels of a wireless link approaching the near-field regime is studied. The elements of the 2-antenna transmit- and receive-arrays are chosen to be identical folded dipole antennas operating at 5.6 GHz. We find that two equally strong channels can be created even if the antennas interact at sub-wavelength distances, thus confirming previous theoretical predictions.

关键词： Dipole antennas Antenna radiation patterns MIMO Wireless communication Interference Integrated circuit interconnections Bandwidth

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Intercell interference blindness in fairness optimizations 19

Intercell interference blindness in fairness optimizations

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19th International ITG Workshop on Smart Antennas, WSA 2015

作者： Song, Yixin Brunner, Hans H. Nossek, Josef A. Institute for Circuit Theory and Signal Processing Technische Universität München Munich80290 Germany

ISBN: (纸本)9783800736621

In the downlink of a cellular network with channel state information on a limited number of interference channels, the intercell interference (ICI) variance at a mobile device can change unpredictably. This ICI blindness leads to outages or a waste of resources because the link rate adaptation is based on an assumed signal to interference plus noise ratio. Different approaches to deal with ICI blindness have been discussed and compared with sum rate maximizations. In this paper, we extend the handling of the ICI blindness problem to fairness optimizations. Fairness scheduling realizes fairness over many time slots, which includes Round Robin, ThroughPut Fairness and Proportional Fairness. Algorithms are developed to combine the ICI robustness methods and fairness criteria and the performance of the different combinations are compared. © VDE Verlag GMBH · Berlin · Offenbach, Germany.

关键词： Channel state information

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SIMO/MISO MSE-duality for multi-user FBMC with highly frequency selective channels 19

SIMO/MISO MSE-duality for multi-user FBMC with highly freque...

引用

19th International ITG Workshop on Smart Antennas, WSA 2015

作者： De Candido, Oliver Baltar, Leonardo G. Mezghani, Amine Nossek, Josef A. Institute for Circuit Theory and Signal Processing Technische Universität München Munich80290 Germany

ISBN: (纸本)9783800736621

Filter Bank based Multicarrier (FBMC) with Offset-QAM (O-QAM) modulation is one of the strong candidates for the physical layer of 5-th generation mobile communication systems. The combination of FBMC/OQAM with multiple antennas in a multi-user scheme poses some challenges towards the design of equalizers and precoders due to the frequency overlapping of the sub-carriers, especially in environments with highly frequency selective channels. In this work we first calculate a fractionally spaced Minimum Mean Square Error (MMSE)-based equalizer design to accommodate multi-user (MU) Single Input Multiple Output (SIMO)-FBMC. Then, we apply the Mean Square Error (MSE)-duality to calculate the corresponding precoders for MU Multiple Input Single Output (MISO)-FBMC. Furthermore, we present four possibilities for the power allocation between users and sub-carriers. We finally show the performance superiority of the new method compared to a recently proposed method. © VDE Verlag GMBH · Berlin · Offenbach, Germany.

关键词： Equalizers

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DoA Estimation Performance and Computational Complexity of Subspace- and Compressed Sensing-based Methods

DoA Estimation Performance and Computational Complexity of S...

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WSA 2015;19th International ITG Workshop on Smart Antennas

作者： Christoph Stoeckle Jawad Munir Amine Mezghani Josef A. Nossek Institute for Circuit Theory and Signal Processing Munich University of Technology

关键词： complexity classes antenna element Direction of arrival estimation algorithms ANTENNA SYSTEM Snapshots Quantization Small COMPRESSED

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DFE/THP DUALITY FOR FBMC WITH HIGHLY FREQUENCY SELECTIVE CHANNELS

DFE/THP DUALITY FOR FBMC WITH HIGHLY FREQUENCY SELECTIVE CHA...

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European signal processing Conference

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

ISBN: (纸本)9781479988518

Filter bank based multicarrier with Offset-QAM systems (FBMC/OQAM) are strong candidates for the waveform of future 5-th generation (5G) wireless standards. These systems can achieve maximum spectral efficiency compared to other multicarrier schemes, particularly in highly frequency selective propagation conditions. In this case a multi-tap, fractionally spaced equalizer or precoder needs to be inserted in each subcarrier at the receiver or transmitter side to compensate inter-symbol interference (ISI) and inter-carrier interference (ICI). In this paper we propose a new Tomlinson-Harashima precoder (THP) design for FBMC/OQAM based on the mean squared error (MSE) duality from a minimum MSE (MMSE) designed decision feedback equalizer (DFE).

关键词： Filter Bank Multicarrier Offset-QAM Decision Feedback Tomlinson-Harashima MSE duality decision feedback Mean square error decision feedback equalisers spectral efficiency DUALITY Subcarriers waveforms multi-tap

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