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

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A Hybrid Approach for Multi-User Massive MIMO Sparse Channel Estimation based on Bayesian Recovery and Hard Thresholding

A Hybrid Approach for Multi-User Massive MIMO Sparse Channel...

引用

IEEE Globecom Workshops

作者： Javier Garcia Jawad Munir Amine Mezghani Josef A. Nossek Institute for Circuit Theory and Signal Processing Technische Universit?t München 80290 Munich Germany

ISBN: (纸本)9781467395274

We propose an efficient sparse channel estimation algorithm based on the compressed sensing (CS) approach for large scale multi-user (MU) MIMO systems. The proposed scheme is a hybrid one comprising Bayesian and greedy methods. It can improve the estimation performance by incorporating the spatial channel knowledge that the neighboring antennas in an array share the same support. The pilot overhead can be reduced by utilizing the data symbols using a reliability measure for channel estimation. Moreover, the effect of interfering and non-interfering pilots on the estimation performance will be investigated. It will be shown that the proposed hybrid technique performs similar or better than the Bayesian method with substantially reduced complexity.

关键词： multi-user massive MIMO OFDM distributed channel estimation compressed sensing sparse recovery

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Intercell interference robustness tradeoff with loosened covariance shaping 18

Intercell interference robustness tradeoff with loosened cov...

引用

18th International ITG Workshop on Smart Antennas, WSA 2014

作者： Brunner, Hans H. Dotzler, Andreas Utschick, Wolfgang Nossek, Josef A. Institute for Circuit Theory and Signal Processing Technische Universität München Munich80290 Germany Assoc. Institute for Signal Processing Technische Universität München Munich80290 Germany

ISBN: (纸本)9783800735846

We consider the downlink of a cellular network with multiple antenna base stations (BS) and single antenna mobile devices (MD). Whenever a BS changes its beamforming strategy, it changes the intercell interference (ICI) at every MD in the whole network. These changes are usually not predictable and a BS cannot keep track of the signal to interference plus noise ratio (SINR) of its associated MDS. Consequently, it is not optimal to choose beamforming strategies and link rate adaptions based on measured or assumed SINR values. We propose an optimized shaping constraint on the transmit covariances to make the ICI more predictable. The remaining ICI instationarity is handled with an expected rate optimization, which takes a sampled probability density function of the ICI into account. © VDE Verlag GMBH · Berlin · Offenbach, Germany.

关键词： Beamforming

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On matching strategies for wireless receivers 18

On matching strategies for wireless receivers

引用

18th International ITG Workshop on Smart Antennas, WSA 2014

作者： Lehmeyer, Bernhard Ivrlač, Michel T. Mezghani, Amine Nossek, Josef A. Lankl, Berthold Institute for Circuit Theory and Signal Processing Technische Universitä T München Germany Institute for Information Technology Munich University of the Federal Armed Forces Germany

ISBN: (纸本)9783800735846

Power matching and noise matching are well known established approaches, though they are not the only strategies for designing an optimal receiver. If the best SNR is the design goal, then obviously noise matching is the choice, while for obtaining the highest signal level, power matching has to be chosen. In fact the matching two port between the antenna and a commercial low noise amplifier (LNA) for both strategies turns out to be quite different. While for power matching all the power available from the antenna will be absorbed and amplified by the LNA, for noise matching a possibly considerable part of the available power will be reflected. The SNR at the output of the LNA will be superior in the latter case, but at the expense of a reduced signal level. But an ADC at the end of the analog part of the receiver needs a certain signal level to work properly. Therefore a compromise between the two general purpose strategies, which will be called "Sensitivity matching", may be the optimum approach. © VDE Verlag GMBH · Berlin · Offenbach, Germany.

关键词： Low noise amplifiers

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Will the 1-bit GNSS receiver prevail?

Will the 1-bit GNSS receiver prevail?

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IEEE/ION Position, Location and Navigation Symposium

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

ISBN: (纸本)9781479933211

In the context of satellite-based positioning, the problem of range-estimation with low resolution analog-to-digital conversion (ADC) is considered. While ADC with coarse output resolution degrades the positioning performance of Global Navigation Satellite System (GNSS) receivers, it's simplicity allows to realize sampling at high spatial and temporal rates in an energy and hardware efficient way. Therefore, here the achievable range-estimation accuracy of GNSS receive systems with 1-bit ADC resolution, multiple antennas and high receive bandwidths is analyzed. For different scenarios, including multi-path propagation and the presence of broadband interference, we investigate the scaling behavior of the estimation performance when increasing the number of receive antennas or the sampling rate. Results for all considered scenarios show that if a moderately higher number of antennas or a moderately faster temporal rate is used, 1-bit GNSS receive systems have the potential to outperform ideal receivers with infinite ADC resolution. This insight emphasizes that a receiver architecture with 1-bit ADC has the potential to play an important role for future low-cost receivers as well as for sophisticated energy efficient high-performance GNSS systems.

关键词： 1-bit ADC signal parameter estimation Satellite-based positioning

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ENHANCING SPECTRAL EFFICIENCY IN ADVANCED MULTICARRIER TECHNIQUES: A CHALLENGE

ENHANCING SPECTRAL EFFICIENCY IN ADVANCED MULTICARRIER TECHN...

引用

European signal processing Conference

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

ISBN: (纸本)9781479946037

Advanced multicarrier systems, like the Offset-QAM filter bank based (OQAM-FBMC) ones, are gaining importance as candidates for the physical layer of the 5th generation of wireless communications. One of the main advantages of FBMC, when compared to traditional cyclic prefix based OFDM, is its higher spectral efficiency. However, this gain can be lost again if the problem of training based channel estimation is not tackled correctly. This is due to the memory inserted by the longer pulse shaping and the loss of orthogonality of overlapping subcarriers. In this paper we approach the problem of training based channel estimation for FBMC systems. We propose an iterative algorithm based on the expectation maximization (EM) maximum likelihood (ML) that reduces the overhead and consequently improves the spectral efficiency.

关键词： OQAM Filter Bank Multicarrier Channel Estimation ML estimation Expectation Maximization

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OPTIMUM ANALOG RECEIVE FILTERS FOR DETECTION AND INFERENCE UNDER A SAMPLING RATE CONSTRAINT

OPTIMUM ANALOG RECEIVE FILTERS FOR DETECTION AND INFERENCE U...

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IEEE International Conference on Acoustics, Speech and signal processing

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

ISBN: (纸本)9781479928941

The problem of optimum analog receive filtering for digital signal detection and parameter estimation is considered. Here the case of a signal source with bandwidth B_t and a receiver with fixed sampling rate f_s is discussed under the assumption that 2B_t > f_s. We investigate the impact of adjusting the receive bandwidth B_r of the analog pre-filter, which is applied prior to the sampler, with respect to the deflection coefficient or the Fisher information measure. This reveals that the design rule 2B_r < f_s, known as the sampling theorem, does not necessarily lead to optimum system performance. Studying the two analytical information measures under a fix sampling rate f_s and an arbitrary choice of B_r, we provide an example where receive setups with 2B_r > f_s achieve higher detection and parameter estimation performance.

关键词： Filters deflection coefficient signal sources Parameter estimation Fisher information Analog samplers Filtration

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PRECODING FOR SYSTEMS WITH SOFT COMBINING TO COUNTERACT INSTATIONARY INTERCELL INTERFERENCE

PRECODING FOR SYSTEMS WITH SOFT COMBINING TO COUNTERACT INST...

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IEEE International Conference on Acoustics, Speech and signal processing

作者： Hans H. Brunner Jonas Braun Amine Mezghani Josef A. Nossek Institute for Circuit Theory and Signal Processing Technische Universitat Munchen 80290 Munich Germany

ISBN: (纸本)9781479928941

We consider the downlink of a cellular network with multiple antenna base stations and single antenna user terminals. In cellular networks with and without cooperation, the problem of instationary intercell interference arises. Some base stations change their beamforming unpredictably and the signal to interference plus noise ratios of the served user terminals are unknown at the base station. Consequently, the precoding and link rate adaption are outdated and the transmission might fail. Hybrid automatic repeat request can be used to mitigate the risk of such a fail. We propose to optimize the precoders at the base stations based on the expectation of the rate, where we include the effects of soft combining in the optimization.

关键词： Interference signal to noise ratio Automatic repeat request Array signal processing Cost function Conferences

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Estimation of rank deficient covariance matrices with Kronecker structure

Estimation of rank deficient covariance matrices with Kronec...

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

作者： Mario H. Castaneda Josef A. Nossek Institute for Circuit Theory and Signal Processing Technische Universität München Germany

Given a set of observations, the estimation of covariance matrices is required in the analysis of many applications. To this end, any know structure of the covariance matrix can be taken into account. For instance, in case of separable processes, the covariance matrix is given by the Kronecker product of two factor matrices. Assuming the covariance matrix is full rank, the maximum likelihood (ML) estimate in this case leads to an iterative algorithm known as the flip-flop algorithm in the literature. In this work, we first generalize the flip-flop algorithm to the case when the covariance matrix is rank deficient, which happens to be the case in several situations. In addition, we propose a non-iterative estimation approach which incurs in a performance loss compared to the ML estimate, but at the expense of less complexity.

关键词： Covariance matrices Maximum likelihood estimation Brain modeling Conferences signal processing Iterative methods

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MISO broadcasting FBMC system for highly frequency selective channels 18

MISO broadcasting FBMC system for highly frequency selective...

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18th International ITG Workshop on Smart Antennas, WSA 2014

作者： Newinger, Michael Baltar, Leonardo G. Swindlehurst, A. Lee Nossek, Josef A. Institute for Circuit Theory and Signal Processing Technische Universität München München80290 Germany Department for Electrical Engineering and Computer Science University of California Irvine IrvineCA92697 United States

ISBN: (纸本)9783800735846

In this contribution we propose new techniques for multi-user MISO broadcasting with Filter Bank based Multicarrier (FBMC) systems using offset-QAM (OQAM). FBMC is a prominent alternative to OFDM that can achieve higher bandwidth efficiency since no cyclic prefix is required. However, when extending FBMC to a multi-antenna system, approaches that are used in OFDM cannot be directly applied due to its special structure and the existence of inter-carrier and intersymbol interference. We will consider a downlink scenario for the transmission from a multi-antenna base station to several single-antenna mobile stations. To this end, a Minimum Mean Square Error (MMSE) based multi-tap precoder and equalizer will be designed. Our method is of particular interest for highly frequency selective channels. © VDE Verlag GMBH · Berlin · Offenbach, Germany.

关键词： Orthogonal frequency division multiplexing

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Optimizing the energy efficiency of SIMO receivers with compact uniform linear arrays

Optimizing the energy efficiency of SIMO receivers with comp...

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International Symposium on Wireless Communication Systems (ISWCS)

作者： Qing Bai Amine Mezghani Michel T. Ivrlač Josef A. Nossek Institute for Circuit Theory and Signal Processing Technische Universität München Munich Germany

ISBN: (纸本)9781479958641

The energy efficiency of a multi-antenna receiver is influenced by the configuration of the antenna array it employs, e.g. with more receive antennas, larger capacity can be obtained while power dissipation is expected to increase. When compact uniform linear arrays are considered, the distance between adjacent antennas becomes a critical parameter due to its close relation to both spatial correlation and antenna mutual coupling, which are the major effects introduced by compact antenna arrays. In this paper, we formulate the optimization of energy efficiency with respect to both the antenna spacing and the number of antennas, and perform extensive numerical experiments to evaluate the gain that can be achieved by applying the optimization results. Moreover, we demonstrate the effects of various system parameters on the optimal antenna spacing, including mean angle of arrival, angle spread, average channel gain, and antenna loss factor, and propose also a simple approximation method to greatly reduce the complexity in finding the optimal spacing.

关键词： Receiving antennas Linear antenna arrays Correlation Noise

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