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International Symposium on Wireless Communication Systems (ISWCS)

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

In the recent years, resource allocation problems for energy harvesting nodes have been studied extensively. While a large portion of these contributions focus on the transmit side, less attention has been paid to the receive side or jointly on both sides. In this work, we investigate the joint optimization of transmit and receive policies for a pair of energy harvesting nodes, in the basic setting of point-to-point communication over a single link. The discrete energy arrivals at the two nodes are assumed as independent Poisson processes, and are only known to the respective nodes causally. To this end, we model the system as two decentralized Markov decision processes, which do not share information about their local states but are coupled only through a global reward function, namely, the average throughput of the system. We first compute an upper bound on the system performance by assuming a central controller which is aware of the states of both nodes, and applying the policy-iteration algorithm. Then, based on the transition-independent property of the problem, we employ a low-complexity bilinear programming approach, which, via comparison with the obtained upper bound, is shown to produce local policies with very good performance.

关键词： Receivers Transmitters Energy harvesting Optimization Throughput Batteries Energy resolution

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LNA noise parameter measurement

LNA noise parameter measurement

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European Conference on circuit theory and Design, ECCTD

作者： Bernhard Lehmeyer Michel T. Ivrlač Josef A. Nossek Institute for Circuit Theory and Signal Processing Technische Universität München Munich Germany

Joint measurement of stochastic parameters of a low noise amplifier (LNA), based on output power measurement for input termination impedances is considered. As an advantage of this method the noise parameters can be determined in a quick way for narrow and broad band applications without special equipment. Knowing the noise parameters helps the user designing both matching networks for given low noise amplifiers and for optimizing amplifiers. Four real parameters characterize the amplifier with the noise figure as function of the matching network. About ten different values for input termination impedances also provide an estimation of sensitivity and accuracy of this new method.

关键词： Noise Noise measurement Europe Impedance measurement Power measurement Decision support systems Erbium

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Downlink per-user multi-streaming for FBMC/OQAM based multi-user MIMO with highly frequency selective channels 19

Downlink per-user multi-streaming for FBMC/OQAM based multi-...

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19th International ITG Workshop on Smart Antennas, WSA 2015

作者： Cheng, Yao Haardt, Martin Baltar, Leonardo G. Nossek, Josef A. Communications Research Laboratory Ilmenau University of Technology P. O. Box 100565 IlmenauD-98694 Germany Institute for Circuit Theory and Signal Processing Technische Universität München Munich80290 Germany

ISBN: (纸本)9783800736621

This paper provides solutions for per-user multistream transmissions in FBMC/OQAM based multi-user MIMO downlink systems under highly frequency selective propagation conditions. A signal-to-leakage-plus-noise-ratio (SLNR) based metric is proposed, and it is tailored for the downlink of FBMC/OQAM-based multi-user MIMO settings. Then at the base station, per-subcarrier fractionally spaced multi-tap precoders are computed based on this metric to mitigate the multi-user interference (MUI), the inter-symbol interference (ISI), as well as the inter-carrier interference (ICI) and to map the multiple data streams of each user to the transmit antennas. With the base station carrying most of the computational load, each user terminal only employs a zero-forcing (ZF) based one-tap spatial equalizer to recover the desired streams. Simulation results show that the proposed SLNR based precoding scheme achieves satisfactory performances in various multi-user MIMO downlink scenarios. It significantly outperforms the existing algorithms that require the channel on each subcarrier to be flat fading. © VDE Verlag GMBH · Berlin · Offenbach, Germany.

关键词： Taps

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A Leaner Carrier for the New 5G Air Interface

A Leaner Carrier for the New 5G Air Interface

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IEEE Vehicular Technology Conference

作者： Kilian Roth Cecilia Carbonelli Michael Faerber Josef A. Nossek Institute for Circuit Theory and Signal Processing Technical University Munich Standards and Advanced Technology Intel Mobile Communications

ISBN: (纸本)9781479980895

This paper studies the physical layer performance of a lean carrier with reduced reference symbols and reduced control channel overhead as a possible candidate for a new 5G air interface. Specifically, we will show that, with minor modifications and optimizations, competitive link level performance can be achieved even in extreme use case scenarios using synchronization and channel estimation algorithms already employed in LTE-A. Further, we propose a set of enhancements to the broadcast channel and to the common search space configurations to fully dispense with cell specific reference symbols and legacy control channels.

关键词： Lean carrier 5G air interface Control channels Broadcast channel Synchronization Channel estimation

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Downlink per-user multi-streaming for FBMC/OQAM based multi-user MIMO with highly frequency selective channels

Downlink per-user multi-streaming for FBMC/OQAM based multi-...

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WSA 2015;19th International ITG Workshop on Smart Antennas

作者： Yao Cheng Martin Haardt Leonardo G. Baltar Josef A. Nossek Communications Research Laboratory Ilmenau University of Technology Institute for Circuit Theory and Signal Processing Technische Universitat Munchen

This paper provides solutions for per-user multistream transmissions in FBMC/OQAM based multi-user MIMO downlink systems under highly frequency selective propagation conditions. A signal-to-leakage-plus-noise-ratio (SLNR) based metric is proposed, and it is tailored for the downlink of FBMC/OQAMbased multi-user MIMO settings. Then at the base station, per-subcarrier fractionally spaced multi-tap precoders are computed based on this metric to mitigate the multi-user interference (MUI), the inter-symbol interference (ISI), as well as the inter-carrier interference (ICI) and to map the multiple data streams of each user to the transmit antennas. With the base station carrying most of the computational load, each user terminal only employs a zero-forcing (ZF) based one-tap spatial equalizer to recover the desired streams. Simulation results show that the proposed SLNR based precoding scheme achieves satisfactory performances in various multi-user MIMO downlink scenarios. It significantly outperforms the existing algorithms that require the channel on each subcarrier to be flat fading.

关键词： Downlink BASE STATION transmitting antennas multiple input multiple output systems flat fading data flow selective channel based Subcarriers multi-user

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A lower bound for the fisher information measure

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IEEE signal processing Letters 2014年第7期21卷 796-799页

作者： Stein, Manuel Mezghani, Amine Nossek, Josef A. Institute for Circuit Theory and Signal Processing Technische Universität München München 80290 Germany

The problem how to approximately determine the value of the Fisher information measure for a general parametric probabilistic system is considered. Having available the first and second moment of the system output in a parametric form, it is shown that the information measure can be bounded from below through a replacement of the original system by a Gaussian system with equivalent moments. The presented technique is applied to a system of practical importance and the potential quality of the bound is demonstrated. © 1994-2012 IEEE.

关键词： Linear systems

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Efficient Frequency-Domain Fractionally-Spaced Equalizer for Flexible Digital Coherent Optical Receivers

Efficient Frequency-Domain Fractionally-Spaced Equalizer for...

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European Conference on Optical Communication

作者： Fabio Pittala Josef A. Nossek European Research Center Huawei Technologies Dusseldorf GmbH Munich Germany Institute for Circuit Theory and Signal Processing Technische Universität München Munich Germany

Training-aided frequency-domain equalization for coherent receivers based on digital-signal-processing with oversampling factor below 2 samples-per-symbol (sps) is reported. The proposed architecture shows no performa... 详细信息

关键词： Equalizers MIMO Estimation Frequency-domain analysis Digital signal processing Channel estimation Receivers

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Improving energy-efficiency of multi-antenna receivers via adaptation of ADC resolutions 20

Improving energy-efficiency of multi-antenna receivers via a...

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20th European Wireless Conference, EW 2014

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

ISBN: (纸本)9783800736218

The energy-efficiency of a receiver, which we measure in this work by the number of information bits conveyed per Joule of energy consumption at the receiver, is greatly influenced by the design and bit resolution of the analog-todigital converter (ADC) it employs. For a given ADC, using higher resolution leads to less quantization error in the digitized receive signal, yet requires a larger power dissipation. This trade-off can be utilized to maximize the energy-efficiency by adapting the ADC resolution according to the state of the communication channel. For a receiver with multiple antennas, the resolution of ADC associated with each antenna can be jointly adapted, leading to a multivariate integer programming problem which is difficult to solve to optimality. We propose several adaptation strategies which differ in complexity and the amount of online computations, and compare their performances based on the simulation results. Furthermore, we show that equipping the receiver with more antennas is beneficial to its energy-efficiency when only a subset of antennas associated with relatively good channel conditions is chosen for reception, and an appropriate ADC resolution is employed for the quantization of receive signals. As the improvement in energy-efficiency falls off with increasing number of antennas, a cost-effective antenna number can be determined by the receiver, depending on the application scenario and the physical limitations on the device. © VDE VERLAG GMBH, Berlin, Offenbach, Germany.

关键词： Energy efficiency

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Information-preserving spatial filtering for direction-of-arrival estimation 18

Information-preserving spatial filtering for direction-of-ar...

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18th International ITG Workshop on Smart Antennas, WSA 2014

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

This work investigates the problem of direction-of-arrival estimation with a large number of antennas. As in practice the number of antennas M is limited by power and hardware constraints, here the possibility to comp... 详细信息

ISBN: (纸本)9783800735846

关键词： Beamforming

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Spectral shaping with low resolution signals

Spectral shaping with low resolution signals

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Asilomar Conference on signals, Systems and Computers

作者： Hela Jedda Amine Mezghani Josef A. Nossek Institute for Circuit Theory and Signal Processing Technische Universitat M??nchen 80290 Munich Germany

ISBN: (纸本)9781467385770

We aim at investigating the impact of low resolution digital-to-analog converters (DACs) at the transmitter and low resolution analog-to-digital converters (ADCs) at the receiver on the required bandwidth and the required signal-to-noise ratio (SNR). In particular, we consider the extreme case of only 1-bit resolution (with oversampling), where we propose a single carrier system architecture for minimizing the spectral occupation and the required SNR of 1-bit signals. In addition, the receiver is optimized to take into account the effects of quantization at both ends. Through simulations, we show that despite of the coarse quantization, sufficient spectral confinement is still achievable.

关键词： signal to noise ratio Bandwidth Delays Receivers Quantization (signal) Transmitters OFDM

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