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CDI Rate-balancing with Per-base-station Constraints

CDI Rate-balancing with Per-base-station Constraints

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WSA 2016;20th International ITG Workshop on Smart Antennas

作者： David Neumann Andreas Gruendinger Michael Joham Wolfgang Utschick

We previously introduced a rate-balancing precoding technique based on channel distribution information, which significantly reduces the impact of pilot-contamination in the downlink of a massive MIMO system. We now extend the ratebalancing optimization problem for the precoders to multiple power constraints, to be able to apply the technique in a coordinated multi-point setting. For this problem, we derive an efficient and adaptive method to find a globally optimal solution based on transformation in the dual uplink. Finally, the results are compared to the optimization with a single sum-power constraint, where the beamforming vectors are simply scaled to satisfy the constraints at each base station.

关键词： Constraint Capacitive Discharge Ignition optimal solution multiple input multiple output systems BASE STATION Set of points Information Distribution multipoint prediction coding

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Coordinated Interference Mitigation Precoding in Unsynchronized Small Cell LTE Networks

Coordinated Interference Mitigation Precoding in Unsynchroni...

引用

IEEE Global Communications Conference

作者： Stanislaus Iwelski Erfan Majeed Zijian Bai Guido H. Bruck Peter Jung Department of Communication Technologies University of Duisburg-Essen

ISBN: (纸本)9781479959532

Next generation long term evolution (LTE) systems evolve towards small cell networks (SCNs) to enable the tremendous data growth through extreme frequency reuse. However, shrinking the cell size to boost the spectral efficiency comes at the expense of increased co-channel interference (CCI) and is the dominant limiting factor from achieving higher network capacities. Consequently, downlink (DL) scenarios in the cell edge become particularly crucial, as the user equipment (UE) is typically surrounded with multiple interfering small cells. To overcome this limitation, in this paper we focus on cooperative interference mitigation schemes where UEs in good channel condition empower the cell edge UE to mitigate the CCI through linear precoding schemes. We provide a practical realization of the cooperative interference mitigation precoding scheme and determine the set of reference signal configuration to enable the promised performance in unsynchronized SCNs with varying timing offsets (TOs) among the receive signals. With simulation results at the link level, we show that estimating and compen-sating the TO reliable channel state information (CSI) can be achieved for the non-colliding CSI mapping scheme and as a result near optimum DL transmission can be achieved at the cell edge UE in practical SCNs.

关键词： Small Cells Heterogeneous Networks LTE Interference Precoding prediction coding Local thermodynamic equilibrium Heterogeneous networks disturbance suppression Long Term Evolution link level UNITED ELECTRIC interference Cell Size frequency reuse

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Distributed User-Centric Clustering and Precoding Design for CoMP Joint Transmission

Distributed User-Centric Clustering and Precoding Design for...

引用

IEEE Global Communications Conference

作者： Sandra Lagen Adrian Agustin Josep Vidal Beatriz Soret Klaus I. Pedersen Dept. Signal Theory and Communications - Universitat Politecnica de Catalunya (UPC) Nokia Networks

ISBN: (纸本)9781479959532

This paper addresses distributed interference management in downlink of multi-cell multiple-input multiple-output (MIMO) time division duplex (TDD) networks. Each user is associated with a user-centric cluster of base stations (BSs), which cooperatively serve the user through CoMP joint transmission. Clusters of different users possibly share some BSs such that they may overlap, being coupled by interference and transmit power constraints at each BS. Our objective is the design of BSs clustering and precoding matrices per-user in order to maximize the weighted sum-rate of the system by controlling the interference and the power spent at BSs. In contrast to previous works where all channel matrices in the system are needed, we propose a distributed procedure whereby only channel matrices towards a limited number of candidate BSs per user are required while interference is still controlled by using the signal received from an uplink transmission. For an LTE-compliant dense deployment of 2×2 MIMO BSs/users, results show gains of 6-16% in terms of sum-rate and 49-84% in terms of 5%-tile per-user rate (depending on the maximum cluster size) as compared to distributed BS-disjoint clustering schemes.

关键词： matrices Consumers Blind source separation prediction coding multiple input multiple output systems Distribute interference interference IFI6 gene Transmitter power Joints Joints Cluster Analysis

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Reliable OFDM System Design under Hostile Multi-tone Jamming

Reliable OFDM System Design under Hostile Multi-tone Jamming

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IEEE Global Communications Conference

作者： Mai Abdelhakim Jian Ren Tongtong Li Department of Electrical & Computer Engineering Michigan State University

ISBN: (纸本)9781467309202

Along with the advent of reconfigurable radios, hostile jamming is no longer limited to military applications, but has become a serious threat for civilian wireless communications, where OFDM has been identified as one of the most efficient transmission technologies. In this paper, we consider reliable transmission of OFDM systems under multi-tone jamming. We propose to enhance the jamming resistance of OFDM through symbol level precoding. Our approach is to find the optimal precoder and decoder that can minimize the MSE between the transmitted and the estimated symbols, subject to a given transmit power constraint. Closed-form solutions are derived, and further demonstrated through simulation examples. It is observed that adding controlled redundancy at symbol level is an effective way to mitigate hostile jamming in OFDM systems.

关键词： Hostile jamming Physical layer security Precoding OFDM Orthogonal frequency division multiplexing prediction coding Physical layer jamming CARRIER SYSTEM decoders Mean square error Transmitter power

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Ordered Tomlinson-Harashima Precoding in *** Downstream

引用

IEEE Global Communications Conference

作者： Miroslav Hekrdla Andrea Matera Weiyang Wang Dong Wei Umberto Spagnolini Dipartimento di Elettronica Informazione e Bioingegneria (DEIB) Politecnico di Milano Huawei Technology Co. Ltd.

ISBN: (纸本)9781479959532

*** is an upcoming next generation DSL standard envisioned to use bandwidth up to 212 MHz. Far-end crosstalk (FEXT) at these frequencies greatly overcomes direct links. Its cancellation based on non-linear Tomlinson-Harashima Precoding (THP) proved to show significant advantage over standard linear precoding. This paper proposes a novel THP structure in which ordering of successive interference pre-cancellation can be optimized for downstream with non-cooperating receivers. The optimized scheme is compared to existing THP structure denoted as equal-rate THP which is widely adopted in wireless downlink. Structure and performance of both methods differ significantly favoring the proposed scheme. The ordering that maximizes the minimum rate (max-min fairness) for each tone of the discrete multi-tone modulation is the familiar V-BLAST ordering. However, V-BLAST does not lead to the global maximum when applied independently on each tone. The proposed novel Dynamic Ordering (DO) strategy takes into account asymmetric channel statistics to yield the highest minimum aggregated rate.

关键词： pirarubicin prediction coding Global Maximum Downstream V-BLAST CANCELLATIONS tone modulation Bandwidth DIRECT DRIVE

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Non-linear precoding for the downlink of FBMC/OQAM based multi-user MIMO systems

Non-linear precoding for the downlink of FBMC/OQAM based mul...

引用

WSA 2015;19th International ITG Workshop on Smart Antennas

作者： Yao Cheng Venkatesh Ramireddy Martin Haardt Communications Research Laboratory Ilmenau University of Technology

In this contribution, we present new progress on the design of non-linear precoding techniques for filter bank based multi-carrier with offset quadrature amplitude modulation (FBMC/OQAM) based multi-user multiple-input-multipleout (MIMO) downlink systems. The user terminals are allowed to have multiple antennas, and multi-stream transmissions for each user are enabled. First, the Tomlinson Harashima precoder (THP) based approach is generalized to such scenarios. Then, we discuss how to further adapt it to the case where the total number of receive antennas of the users exceeds the number of transmit antennas. An iterative THP scheme is devised such that the THP based non-linear precoding can be applied flexibly without suffering from the dimensionality constraint. The promising performance of the two non-linear precoding algorithms for FBMC/OQAM based multi-user MIMO downlink settings is demonstrated via numerical results.

关键词： multiple input multiple output systems prediction coding pirarubicin Downlink based OQAM multiple antenna Consumers Distress user terminal

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Pre-equalized Faster Than Nyquist Transmission for 5G Cellular Microwave Backhaul

Pre-equalized Faster Than Nyquist Transmission for 5G Cellul...

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IEEE International Workshop on Signal Processing Advances in Wireless Communications

作者： Marco Maso Stefano Tomasin Mathematical and Algorithmic Sciences Lab Huawei France Research Center Boulogne-Billancourt France

ISBN: (纸本)9781509017508

Microwave backhaul links can nowadays deliver rather impressive throughput, however 5G systems will require further higher efficiencies and a promising solution is the so-called faster than Nyqust (FTN) transmission. A FTN communication is obtained when the Nyquist inter-symbol interference (ISI) criterion is not respected because the transmission rate is higher than that for which the shaping filter is designed. While increasing the achievable rate, the complexity increase has up to now discouraged application of FTN in practical systems. In this paper, we propose to compensate for the ISI by means of a non-linear precoding strategy, i.e. the Tomlinson-Harashima precoder (THP), in turn eliminating the need for costly equalizations at the receiver. We characterize the performance of the proposed FTN system by deriving analytical bounds on the achievable rates of the transmissions over a FTN microwave link using high-order modulations and capacity achieving codes. The proposed solution is capacity-achieving at high SNR (which is the operating regime of backhaul microwave links) and has a complexity that does not increase with the density of the constellation. Numerical results show the effectiveness of the THP-FTN solution paving the way towards its implementations on microwave links.

关键词： Receivers Microwave theory and techniques Precoding Complexity theory Modulation Signal to noise ratio Transmitters Microwave theory and techniques signal to noise ratios prediction coding Complexity theory Receivers Transmitters return stroke Microwave links MICROWAVE high SNR

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Is Tomlinson-Harashima Precoding Suitable for Fiber-Optic Communication Systems?

Is Tomlinson-Harashima Precoding Suitable for Fiber-Optic Co...

引用

ITG-Fachtagung Photonische Netze

作者： Roi Rath Christian Schmidt Werner Rosenkranz Lehrstuhl fur Nachrichten- und Ubertragungstechnik

ISBN: (纸本)9783800735037

Tomlinson-Harashima precoding (THP) is a pre-compensation method, which is exactly fitted to the channel impulse response in order to completely compensate for its linear impairments, and it is in-fact a generalization of partial response precoding. THP is very popular in the field of wireless communications, namely in multi-input multi-output (MIMO) scenarios. It offers an alternative to the decision-feedback equalizer (DFE) with the possibility to apply channel coding conjunctively. In this paper, the compatibility of THP with fiber-optic communication systems is investigated. Different configurations of THP are considered and compared with DFE by means of performance and complexity. Results are examined for 4QAM modulation, where the length of the transmission link and the number of equalizer coefficients are varied. In addition, the effect of the receiver filter's bandwidth on the performance of THP is evaluated. In the second step, possible scenarios for using THP in a fiber-optic system, as well as challenges, which result from properties of the system and equalizer, are addressed and discussed.

关键词： pirarubicin Optical fiber systems decision feedback equalisers CARRIER SYSTEM transmission link Optical fibre communication prediction coding channel impulse response COMMUNICATION SYSTEMS Equalizers

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Quantized Team Precoding: A Robust Approach for Network MIMO under General CSI Uncertainties

Quantized Team Precoding: A Robust Approach for Network MIMO...

引用

IEEE International Workshop on Signal Processing Advances in Wireless Communications

作者： Paul de Kerret David Gesbert Communication Systems Department EURECOM

ISBN: (纸本)9781509017508

The obtaining of accurate channel state information (CSI) at the transmitter (TX) side is known to be one of the main limitations for joint precoding across distant multiple-antennas TXs. Indeed, the knowledge of the multi-user CSI usually requires an information sharing step between the TXs, which makes cooperation challenging in many wireless settings. To alleviate the problem, we study the transmission when the CSI is imperfectly shared between the TXs, a setting we refer as Distributed CSIT (D-CSIT). In such a case, the optimization of the joint precoder distributed across the distant TXs becomes a very different problem from the precoding usually encountered when all antennas receive the same channel estimate. Indeed, the precoder design then falls in the category of Team-Decision (TD) problems: Each TX does not know the information available (hence the precoder) at the other TXs. In this paper, we introduce a novel framework referred to as Quantized Team Precoding (QTP) which allows for robust distributed precoding in the presence of such CSI uncertainties. The method relies on the concept of consistency enforcement, which is obtained by quantizing the CSI space. The obtained precoders exhibit superior rate performance compared to precoders that classical robust designs from the literature.

关键词： prediction coding ANTENNA

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FPGA Implementation of ZF-THP for MU-MISO-OFDM Systems

FPGA Implementation of ZF-THP for MU-MISO-OFDM Systems

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International OFDM Workshop

作者： Frank Ludwig Axel Budweg Steffen Paul Institute of Electrodynamics and Microelectronics (ITEM) University of Bremen

ISBN: (纸本)9783800733606

In wireless multi-user communication systems with multi-antenna base stations the application of precoding techniques is strongly recommended for accurate detection of the signals at the mobile stations if no cooperation between them is desired. The Tomlinson-Harashima Precoding (THP) for MIMO channels provides an excellent performance combined with low complexity at the receivers. In this contribution an efficient FPGA implementation of Zero-Forcing THP is presented. It is well suited for the modular architecture of base stations. A high throughput is achieved by parallelization and pipelining. The developed fixed-point design obtains the same bit error rate performance as an ideal floating-point precoding.

关键词： bit error rate performance prediction coding Field programmable gate arrays mobile station pirarubicin BASE STATION parallelization Receivers

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