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Interference temperature analysis in a large scale cellular system 17

Interference temperature analysis in a large scale cellular ...

引用

17th International ITG Workshop on Smart Antennas, WSA 2013

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

ISBN: (纸本)9783800734665

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. © WSA 2013 - 17th International ITG Work. on Smart Antennas. All rights reserved.

关键词： Base stations

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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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On multistreaming with compact antenna arrays

On multistreaming with compact antenna arrays

引用

International ITG Workshop on Smart Antennas

作者： Ivrlač, Michel T. Nossek, Josef A. Institute for Circuit Theory and Signal Processing Technische Universität München D-80333 Munich Germany

ISBN: (纸本)9781612840741

We investigate the capability of compact antenna arrays to support the simultaneous transfer of several independent data streams over the same band of frequencies. It is shown that the near-field interaction of the closely spaced antennas inside the arrays accounts for a surprisingly good multistreaming capability, even for extremely compact arrays. This result is demonstrated for the case of a 2 2 system of thin half-wavelength dipoles in a multipath environment provided by two perfectly conducting reflector plates, and isotropic background noise. Decoupling/power-matching and decoupling/noise-matching networks are applied at the transmit side and the receive side arrays, respectively. The analysis is based on a circuit theoretic multiport model of the system which captures all relevant physics of antenna mutual coupling, the influence of the matching networks, and noise. It is shown that in the absence of heat loss in the matching networks and antenna wires, the simultaneous transfer of two data streams can work perfectly well even as the separation between the antennas inside the arrays approaches zero. © 2011 IEEE.

关键词： Antenna arrays

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Physical modeling of communication systems in information theory

Physical modeling of communication systems in information th...

引用

2009 IEEE International Symposium on Information theory, ISIT 2009

作者： Ivrlac, Michel T. Nossek, Josef A. Institute for Circuit Theory and Signal Processing Technische Universität München D-8033 Munich Germany

ISBN: (纸本)9781424443130

It is common in information theoretic channel models to rely on the average squared Euclidean norm of the channel input as being proportional to transmit power. Likewise, it is common to assume noise that is additive, Gaussian, and white. It is a legitimate question to ask, whether such a modeling approach has enough degrees of freedom to capture the physical constraints that are imposed on implementations of a communication system. In this paper, we show that in many, though not all, situations it is indeed possible to obtain a complete physical model, while nevertheless sticking with average squared Euclidean norm as power, and white Gaussian noise. Our systematic approach works in two steps. First, all channel inputs and outputs are replaced by ports, which are defined by two conjugated variables (like voltage and current). By this multi-port modeling approach, we can obtain a complete physical model. Secondly, we introduce linear transformations between the inputs and outputs of the information theoretic channel model on the one hand, and the physical inputs and physical outputs of the communication system, on the other. This approach gives us enough degrees of freedom to obtain a complete information theoretic model, which correctly refiects the physical constraints that are imposed upon the communication system by its environment. We apply the proposed approach to a multi-antenna communication system, and show that it is indeed possible that the channel capacity of multi-antenna systems can grow super-linearly with the number of antennas for large signal to noise ratios. © 2009 IEEE.

关键词： Linear transformations

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On physical limits of massive MISO systems 20

On physical limits of massive MISO systems

引用

20th International ITG Workshop on Smart Antennas, WSA 2016

作者： Ivrlač, Michel T. Nossek, Josef A. Institute for Circuit Theory and Signal Processing Technische Universität München MunichD-80333 Germany

ISBN: (纸本)9783800741779

We analyze the performance of a fixed-size uniform circular array which is used to transmit information to a single antenna receiver as a function of the number of transmit side antennas. We find that the minimum necessary energy to transfer one information bit stops decreasing once the number of antennas grows over a certain bound. We relate this bound to the diameter of the array and show that there is an optimum and finite number of antennas for every such array. For large array diameters this optimum number grows linearly with the diameter, the factor of proportionality primarily depending on whether the receiver is inside or outside of the transmit uniform circular array. © VDE VERLAG GMBH · Berlin · Offenbach, Germany.

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A multiport theory of communications

A multiport theory of communications

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2010 International ITG Conference on Source and Channel Coding, SCC 2010

作者： IvrlǍ, Michel T. Nossek, Josef A. Institute for Circuit Theory and Signal Processing Technische Universität München D-80333 Munich Germany

ISBN: (纸本)9781424468720

Electromagnetics provides the ground for a physical theory of communications, while information theory and signal theory approach the problem from a purely mathematical point of view. Nevertheless, the latter theories frequently do refer to physical terms, such as: energy, power, noise, antennas, or waves. It is strange enough, that, at present time, there is no provision being made such that the usage of such terms in information theory is at least consistent with the governing physics. More often than not, this results in less than optimum signal processing solutions and does not contribute to a complete understanding of communication systems. circuit theoretic channel models can help to bridge the gap between the physics of electromagnetics, and the mathematical world of information theory. The multiport concept makes sure that important physical concepts like energy, power, or noise are captured correctly, and terms such as antennas or waves are applied consistently with their physical meanings in information theory and signal processing. We suggest how to make circuit theoretic channel models and apply them to wireless communication systems which uses multiple antennas at both ends of the link. We thereby show that, in contrast to common belief, arrays of closely spaced antennas actually do support the bandwidth- and power-efficient multi-stream transmission. © VDE Verlag -GMBH.

关键词： Antennas

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On the physical meaning of the model of two uncoupled isotrops

On the physical meaning of the model of two uncoupled isotro...

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2012 16th International ITG Workshop on Smart Antennas, WSA 2012

作者： Ivrlač, Michel T. Nossek, Josef A. Institute for Circuit Theory and Signal Processing Technische Universität München D-80333 Munich Germany

ISBN: (纸本)9781457719240

From first principles, we show that two non-isotropic radiators with a specific and uniquely determined far-field pattern can be modeled consistently as two uncoupled isotropic radiators, provided one is willing to accept a non-linear distortion of the geometry. This shows that the, per se, non-physical model of uncoupled isotrops can have physical meaning in correctly describing the behavior of special non-isotropic radiators. The necessary distortion of geometry and its consequences are discussed. © 2012 IEEE.

关键词： Radiators geometry Meaning Nonlinear distortion far-field

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Resonant multistage charging of dominant capacitances 12th

Resonant multistage charging of dominant capacitances

引用

12th International Workshop on Power and Timing Modeling, Optimization and Simulation, PATMOS 2002

作者： Saas, Christoph Nossek, Josef A. Munich University of Technology Institute for Circuit Theory and Signal Processing Arcisstr. 16 Munich80290 Germany

ISBN: (纸本)9783540441434

It has been shown [2] that adiabatic switching can significantly reduce the dynamic power dissipation in an integrated circuit. Due to the overhead in the realization of adiabatic logic blocks [3] the best results are achieved when it is used only for charging dominant loads in an integrated circuit [7]. It has been demonstrated [4] that a multi stage driver is needed for minimal power dissipation. In this article a complete three stage driver including the generation of oscillating supply is described. To obtain a minimal power dissipation during synchronization the resonant frequency has to be constant. Therefore the waveforms for the logic states of the signal and the realization of a single stage differ from those presented in [4]. In the H-SPICE simulations losses of the inductor are taken into account. This allows to estimate the power reduction that is achievable in a real system. © Springer-Verlag Berlin Heidelberg 2002.

关键词： Natural frequencies

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Transmit and receive array gain of uniform linear arrays of isotrops

Transmit and receive array gain of uniform linear arrays of ...

引用

2009 IEEE Sarnoff Symposium, SARNOFF 2009

作者： Ivrlac, Michel T. Nossek, Josef A. Institute for Circuit Theory and Signal Processing Technische Universität München D-80333 Munich Germany

ISBN: (纸本)9781424433827

Both in the signal processing and in the information theory literature, it is common to assume that the array gain of antenna arrays grows linearly with the number of antennas. However, such an assertion is valid only when the antennas are uncoupled. When antenna coupling is present and properly taken into account by the signal processing algorithms, we show that both the transmit and the receive array gain can grow super-linearly with the number of antennas. In special cases, the receive array gain can even grow exponentially with the antenna number. These results are exciting, for they imply that the potential of radio communication systems which use more than one antenna at the receiver or the transmitter, is likely to be much higher than previously reported.

关键词： Antenna arrays

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Combining multi-user diversity with eigenbeamforming in correlated channels 11

Combining multi-user diversity with eigenbeamforming in corr...

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11th European Wireless Conference on Next Generation Wireless and Mobile Communications and Services, European Wireless 2005

作者： Castañeda, Mario Joham, Michael Ivrlač, Michel Nossek, Josef A. Institute for Circuit Theory and Signal Processing Munich University of Technology Arcisstraße 21 Munich80333 Germany

ISBN: (纸本)9783800728862

In a time varying point-to-multi-point link such as the downlink of a network with a base station and several users, there exists an inherent form of diversity called multi-user diversity. This diversity is harnessed by the use of a proper scheduler such as the proportional fair scheduler. Among other factors, the multi-user diversity gain is determined by the dynamic range of the channel fluctuations. For several scenarios including correlated fading channels, this range can be increased by deploying multiple antennas at the transmitter and using opportunistic beamforming. However, point-to-point link transmitting techniques such as eigenbeamforming exist that have proven to be useful in correlated channels. We present the concept of exploiting multi-user diversity in correlated channels with eigenbeamforming. We show how combining eigenbeamforming with the proportional fair scheduler results in a larger multi-user diversity gain than the one achieved through opportunistic beamforming. © Copyright 2015 IEEE All rights reserved.

关键词： Scheduling

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