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Optimizing the number of feedback users 17

Optimizing the number of feedback users

引用

17th International ITG Workshop on Smart Antennas, WSA 2013

作者： Castañeda, Mario H. Theiler, Sebastian Nossek, Josef A. Institute for Circuit Theory and Signal Processing Technische Universität München Munich Germany

ISBN: (纸本)9783800734665

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

关键词： Base stations

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FDD and TDD single-user capacity bounds 9

FDD and TDD single-user capacity bounds

引用

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

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

ISBN: (纸本)9783800734825

Multiple antennas increase significantly the capacity of wireless links under the assumption of perfect channel state information (CSI). In practice, however, in time division duplex (TDD) or frequency division duplex (FDD) systems, the available CSI is obtained with training and/or limited feedback and hence, is not perfect. In this work, we derive tight capacity bounds for the uplink and downlink of TDD/FDD systems with multiple antennas at the base station and a single-antenna user. We also present a performance comparison between the two systems based on the achievable rates and discuss further issues for a relevant comparison. ©VDE VERLAG GMBH · Berlin · Offenbach.

关键词： Channel state information

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Modulation and coding optimization for energy harvesting transmitters 9

Modulation and coding optimization for energy harvesting tra...

引用

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

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

ISBN: (纸本)9783800734825

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. © VDE VERLAG GMBH Berlin Offenbach.

关键词： 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

10th IEEE International Symposium on Wireless Communication Systems 2013, ISWCS 2013

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

ISBN: (纸本)9783800735297

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. © VDE Verlag GMBH.

关键词： Integer programming

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Throughput maximization for energy harvesting receivers 17

Throughput maximization for energy harvesting receivers

引用

17th International ITG Workshop on Smart Antennas, WSA 2013

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

ISBN: (纸本)9783800734665

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

关键词： Fading channels

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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

10th IEEE International Symposium on Wireless Communication Systems 2013, ISWCS 2013

作者： Baltar, Leonardo G. Mezghani, Amine Nossek, Josef A. Institute for Circuit Theory and Signal Processing Technische Universität München 80290 Munich Germany

ISBN: (纸本)9783800735297

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. © VDE Verlag GMBH.

关键词： Iterative methods

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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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Evaluation of Space-Time-Frequency (STF)-Coded MIMO-OFDM Systems in Realistic Channel Models

Evaluation of Space-Time-Frequency (STF)-Coded MIMO-OFDM Sys...

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International Conference on Advanced Information Networking and Applications Workshops (AINAW)

作者： Ricardo Kehrle Miranda João Paulo C. Lustosa da Costa Marco A.M. Marinho Edison Pignaton de Freitas Rafael de Freitas Ramos Kefei Liu Hing Cheung Leonardo Baltar Rafael Timóteo de Sousa Júnior Department of Electrical Engineering University of Brasilia Brasilia Brazil Universidade de Brasilia Brasilia DF BR Department of Electronic Engineering City University of Hong Kong Kowloon Hong Kong China Munich University of Technology Institute for Circuit Theory and Signal Processing Munich Germany

By taking into account several dimension of the transmitted signal, such as space, frequency, period and time, MIMO-OFDM systems allow an increased spectral efficiency and an improved identifiability in comparison to matrix solutions. In this paper, we evaluate MIMO-OFDM systems for geometric scenarios where the narrow band approximation is violated. To this end a new data model is proposed to better represent the behavior of the system in the presence of wide band signals. Moreover, we also relax the assumption that the amount of transmitted antennas is equal to the number of transmitted symbols.

关键词： signal to noise ratio Transmitting antennas Vectors Receiving antennas Bit error rate Data models Tensile stress

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Estimation of noise parameters in multi-antenna receivers using digitized signal samples 17

Estimation of noise parameters in multi-antenna receivers us...

引用

17th International ITG Workshop on Smart Antennas, WSA 2013

作者： Ivrlač, Michel T. Lehmeyer, Bernhard Nossek, Josef A. Hofmann, Christian A. Lankl, Berthold Institute for Circuit Theory and Signal Processing Technische Universität München Germany Institute for Information Technology Federal Armed Forces University Munich Germany

ISBN: (纸本)9783800734665

Multi-antenna systems can provide multi-streaming and diversity operation even in the case where the antennas are spaced electrically close to each other. This requires that a decoupling and matching network (DMN) is connected between the antenna ports and the inputs of the low-noise amplifiers (LNA) of the receiver. The job of the DMN is to electrically decouple the ports which are connected to the LNAs, and to provide the latter with the optimum driving impedance such that their noise gure is minimum (noise matching). The value of the driving impedance to achieve noise matching only depends on certain noise parameters of the receiver. To our best knowledge, there is no measurement equipment available to this date, which would allow to measure these parameters. In this paper, we report on a simple scheme by which these noise parameters can be estimated using the multiantenna receiver itself as the measurement equipment. The idea is to connect the inputs of two LNAs by a coax cable and estimate the correlation *** of the digitized outputs of the respective receiver chains. From two such estimated correlation *** obtained for two *** lengths of the coax cable, all noise parameters which are relevant for noise matching can be obtained. © WSA 2013 - 17th International ITG Work. on Smart Antennas. All rights reserved.

关键词： Antennas

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FDD and TDD Single-User Capacity Bounds

FDD and TDD Single-User Capacity Bounds

引用

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

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

关键词： Downlink Uplink signal to noise ratio Channel estimation Array signal processing Multiple antennas Wireless networks

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