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

共 381 条记录，以下是11-20 订阅

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Quantization-loss reduction for 1-bit BOC positioning

Quantization-loss reduction for 1-bit BOC positioning

引用

institute of Navigation International Technical Meeting 2013, ITM 2013

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

ISBN: (纸本)9781627481380

Accurate time-delay measurement is essential for positioning with Global Navigation Satellite Systems (GNSS). For mobile receivers small cost, moderate complexity and low energy consumption are desirable. In contrast, Safety-of-Life (SoL) applications require fast processing in order to meet strict time constraints. Concerning these technical considerations, single bit analog-to-digital converters (ADC) are highly attractive as they are simple to build, require low energy and allow to realize high sampling rates and fast digital processing. On the other hand, such systems introduce a loss in the estimation accuracy. In this work we derive a mathematical model for 1-bit GNSS receivers, which takes into account the effects of the analog filters and the non-linear quantizer in the receiver front-end. Based on this refinement we derive analytic formulations for the receiver performance by resorting to the estimation theoretic tools which have become popular for the analysis of ideal receivers with infinite resolution. Finally, we verify the 1-bit quantization-loss for time-delay estimation systems, acting in low SNR scenarios, and investigate possible approaches to reduce this degradation by adjusting the analog front-end.

关键词： Estimation

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Physical layer characterization of MIMO systems by means of multiobjective optimization

Physical layer characterization of MIMO systems by means of ...

引用

2005 IEEE International Conference on Acoustics, Speech, and signal processing, ICASSP '05

作者： Brehmer, Johannes Utschick, Wolfgang Institute for Circuit Theory and Signal Processing Munich University of Technology 80333 Munich Germany

ISBN: (纸本)0780388747

A method is presented for efficiently describing the capabilities of the physical layer in a MIMO communication system. Such a description is required in systems that determine the optimum operation point based on information exchange between layers. We characterize the physical layer by means of efficient MSE tuples. Such efficient tuples are found by sampling the boundary of the MSE region. A particularly simple sampling algorithm is derived. We show how the distance between subsequent samples can be directly controlled, allowing us to provide a characterization of the physical layer that is both compact and representative. © 2005 IEEE.

关键词： Telecommunication systems

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Multicarrier systems: A comparison between filter bank based and cyclic prefix based OFDM 17

Multicarrier systems: A comparison between filter bank based...

引用

17th International OFDM Workshop 2012, InOWo 2012

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

ISBN: (纸本)9783800733606

In this contribution we perform a review of some recent developments and important results on Filter Bank based Multicarrier (FBMC) systems and make a comparison with Cyclic Prefix (CP) based OFDM. We first give an overview of the system structure and show how the subcarriers are generated. Then the spectral and peak-to-average power ratio (PAPR) behaviors are summarized. We review the subcarrier model used in the derivation of the per-subcarrier channel equalizers encountered in the recent literature and present a novel method of per-subcarrier channel estimation based on this same model. We finally compare the performance of both FBMC and CP-OFDM by showing some BER simulation results, where both systems occupy the same bandwidth and provide the same throughput. Even with channel estimation we can see that FBMC still achieves more than 1 dB of advantage in Eb/N0 compared to CP-OFDM with a reasonable training sequence length. © 2012 VDE Verlag GmbH. All rights reserved.

关键词： Filter banks

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Transmit processing in MIMO wireless systems

Transmit processing in MIMO wireless systems

引用

Proceedings of the IEEE 6th circuits and Systems Symposium on Emerging Technologies: Frontiers of Mobile and Wireless Communication

作者： Nossek, Josef A. Joham, Michael Utschick, Wolfgang Institute for Circuit Theory and Signal Processing Munich University of Technology 80333 Munich Germany

ISBN: (纸本)0780379381

By restricting the receive filter to be scalar, we derive the optimizations for linear transmit processing from the respective joint optimizations of transmit and receive filters. We can identify three filter types similar to receive processing: the transmit matched filter (TxMF), the transmit zero-forcing filter (TxZF), and the transmit Wiener filter (TxWF). The TxWF has similar convergence properties as the receive Wiener filter, i.e. it converges to the matched filter and the zero-forcing filter for low and high signal to noise ratio, respectively. Additionally, the mean square error (MSE) of the TxWF is a lower bound for the MSEs of the TxMF and the TxZF. The optimizations for the linear transmit filters are extended to obtain the respective Tomlinson-Harashima precoding (THP) solutions. The new formulation of the THP optimizations directly leads to an algorithm to compute the precoding order. We also discuss the reasons why the linear transmit filters are outperformed by the respective THP schemes. © 2004 IEEE.

关键词： Wireless telecommunication systems

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circuit aware design of power-efficient short range communication systems

Circuit aware design of power-efficient short range communic...

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International Symposium on Wireless Communication Systems

作者： Mezghani, Amine Damak, Nesrine Nossek, Josef A. Institute for Circuit Theory and Signal Processing Munich University of Technology 80290 Munich Germany

ISBN: (纸本)9781424463169

We consider the maximization of the overall power efficiency when communicating over a noisy single-input single-output channel while satisfying a certain throughput constraint. The total power dissipation includes the transmit power as well as the analog circuit power consumption. In the context of battery operated short range communication, where low power, low cost and small size are key requirements (e.g. standard IEEE 802.15.4), this circuit aware system optimization is crucial given the growing importance of "Green Communication". In fact, the transmit power in such applications reaches values in the order of or is even smaller than the power dissipation of certain analog components along the signal path. Using an appropriate information-theoretic framework we derive the optimal bit-resolution of the Analog-to-Digital Converter (ADC), the optimal choice of the noise figure for the low noise amplifier (LNA) and the optimal operating input back-off (IBO) of the Power Amplifier (PA) as a function of the path-loss (i.e. the communication distance). This work is an extension to the work [1], where only the ADC and transmit power have been considered. © 2010 IEEE.

关键词： Noise figure

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Multiuser diversity with limited feedback

Multiuser diversity with limited feedback

引用

International ITG Workshop on Smart Antennas

作者： Castaneda, Mario H. Nossek, Josef A. Institute for Circuit Theory and Signal Processing Technische Universiẗat Munchen 80290 Munich Germany

ISBN: (纸本)9781612840741

Multiple antennas at the base station can be employed to serve multiple single-antenna users in the downlink of a system. When the number of active users K is larger than the number of transmit antennas M, the base station can exploit multiuser diversity by cleverly scheduling a set of M users. For this purpose, the base station needs to know the downlink channel state information of all the users in the system. In a frequency division duplex (FDD) system, this is attained with limited feedback from the users. Albeit most of the literature assumes a per-user limited feedback, a system limited feedback is actually more appropriate. Given a constraint on the total amount of airtime available for feedback, in this work we are interested in determining the optimum number of users that should feed back. We observe a tradeoff between the attainable degree of multiuser diversity and the feedback quality. The users are scheduled based on minimizing the sum of the mean square error (MSE) for the selected set of users. © 2011 IEEE.

关键词： Base stations

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Diversity and correlation in Rayleigh fading MIMO channels

Diversity and correlation in Rayleigh fading MIMO channels

引用

2005 IEEE 61st Vehicular Technology Conference -VTC 2005 - Spring Stockholm: Paving the Path for a Wireless Future

作者： Ivrlač, Michel T. Nossek, Josef A. Institute for Circuit Theory and Signal Processing Munich University of Technology 80290 Munich Germany

The performance of MIMO systems and the usefulness of dedicated signal processing and channel coding techniques is strongly affected by presence of fading correlation. For instance, space-time block coding is favored by low fading correlation, while beam-forming techniques are advantageous at high amounts of correlation. In this paper we propose an easy to compute quantitative measure of fading correlation and a measure of diversity present in a MIMO channel. It turns out that channels with the same amount of diversity or correlation behave essentially the same with respect to channel capacity and throughput. On the other hand, channels which differ considerably in diversity and correlation measure, behave fairly different with respect to channel capacity or throughput. In this way it becomes possible to perform a classification of MIMO channels. © 2005 IEEE.

关键词： Rayleigh fading

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Minimum mean square error vector precoding

Minimum mean square error vector precoding

引用

2005 IEEE 16th International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2005

作者： Schmidt, David A. Joham, Michael Utschick, Wolfgang Institute for Circuit Theory and Signal Processing Munich University of Technology 80333 Munich Germany

ISBN: (纸本)3800729091

We derive the minimum mean square error (MMSE) solution to vector preceding for frequency flat multiuser scenarios with a centralized multi-antenna transmitter. The receivers employ a modulo operation, giving the transmitter the additional degree of freedom to choose a perturbation vector. Similar to existing vector preceding techniques, the optimum perturbation vector is found with a closest point search in a lattice. The proposed MMSE vector precoder does not, however, search for the perturbation vector resulting in the lowest transmit energy, as proposed in all previous contributions on vector preceding, but finds an optimum compromise between noise enhancement and residual interference. We present simulation results showing that the proposed technique outperforms existing vector precoders, as well as the MMSE Tomlinson-Harashima precoder. © 2005 IEEE.

关键词： Mean square error

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Robust and reduced-rank matrix wiener filter based on the Block Conjugate Gradient algorithm

Robust and reduced-rank matrix wiener filter based on the Bl...

引用

2005 IEEE 6th Workshop on signal processing Advances in Wireless Communications, SPAWC 2005

作者： Dietl, Guido Botsch, Michael Dietrich, Frank A. Utschick, Wolfgang Institute for Circuit Theory and Signal Processing Munich University of Technology 80333 Munich Germany

In this paper, we consider the Block Conjugate Gradient (BCG) algorithm as a robust and reduced-rank implementation of the Matrix Wiener Filter (MWF). Stopping the BCG iterations before the algorithm converges, reduces the computational complexity as well as the performance loss due to channel estimation errors which is especially a problem in low sample support scenarios. We investigate the inherent robustness of the BCG method by deriving the corresponding filter factor matrix which is a well-known tool in the theory of ill-posed problems to describe and analyze regularizing effects. Moreover, we present a robust BCG algorithm where we applied the regularization method of diagonal loading in order to increase both robustness against estimation errors and flexibility in choosing the number of BCG iterations without decreasing performance. Finally, we use quasi-optimal loading instead of common heuristic choices. Simulation results of a frequency-selective Multi-User Single-Input Multiple-Output (MU-SIMO) system show the improved performance of the robust BCG filter compared to the conventional MWF despite of the enormously reduced computational complexity. © 2005 IEEE.

关键词： signal filtering and prediction

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Iterative multi-user detection using reduced-com plexity equalization 4

Iterative multi-user detection using reduced-com plexity equ...

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6th International ITG-Conference on Source and Channel Coding and 2006 4th International Symposium on Turbo Codes and Related Topics, TURBOCODING 2006

作者： Botsch, Michael Dietl, Guido Utschick, Wolfgang Institute for Circuit Theory and Signal Processing Munich University of Technology Munich80333 Germany

ISBN: (纸本)9783800729470

In this paper, we consider a reduced-complexity equalization method for turbo Multi-User Detection (MUD) in a frequency-selective Code Division Multiple Access (COMA) uplink scenario. The non-linear trellis-based detector which is normally used in turbo receivers, is replaced by the Matrix Wiener Filter (MWF), the optimal linear filter based on the Mean Square Error (MSE) criterion. To further reduce the complexity, the Block Conjugate Gradient (BCG) algorithm is used to approximate the MWF in a low-dimensional Krylov subspace. Additionally, second order statistics of non-stationary random processes are approximated by their time-invariant averages. Simulation results show that embedding the suboptimal MWF in a turbo receiver does not lead to significant performance loss, while reducing the computational complexity enormously.

关键词： Multiuser detection

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