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On the Precoding for Multi-Cell Massive MIMO Systems with Distributed Antenna Subarrays 84

On the Precoding for Multi-Cell Massive MIMO Systems with Di...

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84th IEEE Vehicular Technology Conference (VTC-Fall)

作者： Nishiuchi, Takeaki Lin, Hai Yamashita, Katsumi Wu, Jingxian Osaka Prefecture Univ Grad Sch Engn Osaka 5998531 Japan Univ Arkansas Dept Elect Engn Fayetteville AR 72701 USA

ISBN: (纸本)9781509017010

A pilot contamination elimination (PCE) precoding was recently proposed for multi-cell massive MIMO systems with distributed antenna subarrays, where the number of subarrays is required to be not less than the number of users. In this paper, we consider practical scenario of insufficient number of subarrays, and propose a corresponding PCE precoding scheme. The key idea of the proposed scheme is to utilize multiple pilots in one cell rather than single pilot in the original scheme. It is shown that by separating users into multiple groups according to the associated pilots, multiple downsized equivalent MIMO channels can be obtained, which linearly reduces the required number of subarrays and therefore enables the PCE precoding. This linear relation based interpretation also introduces a new optimization problem of finding subarray power normalization factors to maximize signal-to-interference-plus-noise ratio, where an optimized solution is proposed. Finally, simulation results confirm the validity of the proposed PCE precoding scheme.

关键词： Precoding Antennas MIMO Contamination Downlink Channel estimation Signal to noise ratio prediction coding multiple input multiple output systems signal to noise ratios Downlink channel estimation ANTENNA subarray Pollutant cisplatin/cyclophosphamide/etoposide passenger car equivalent Tetrachloroethylene Antenna arrays Pilots Simulation results

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Transmission Strategies in Downlink of Multi-user Multi-cell Distributed Antenna Systems 12

Transmission Strategies in Downlink of Multi-user Multi-cell...

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12th IEEE International Conference on Green Innovation for Africon Renaissance (AFRICON)

作者： Beyene, Yihenew Iraji, Sassan Jantti, Riku Ruttik, Kalle Aalto Univ Sch Elect Engn Dept Commun & Networking Espoo Finland

ISBN: (纸本)9781479974986

The use of multiple-input multiple-output (MIMO) systems has been a central part of cellular systems for achieving higher capacity. Distributed antenna system (DAS) is a MIMO system with geographically distributed antennas that provide high coverage and capacity due to the spatial macro diversity. In a multi-user scenario, DAS provides better spatial separation among users. An optimal transmission strategy in a multiuser multi-cell DAS is unknown. We analyze and evaluate downlink capacity of three multiplexing strategies: orthogonal transmission, joint precoding, and space division multiplexing (SDM). Based on the evaluation we propose the most appropriate strategy. The sum-rate has been measured in different scenarios. Simulation results show that DAS has superior performance compared to co-located antennas systems (CAS). It is particularly shown that DAS with simple SDM can provide better capacity than joint transmission in addition to reduced complexity and less feedback overhead. This happens when the number of users increases and remote radio units have single antenna.

关键词： MIMO communication antenna arrays cellular radio diversity reception multiuser detection precoding space division multiplexing CAS DAS MIMO systems SDM cellular systems colocated antennas systems geographically distributed antennas joint precoding multiple-input multiple-output systems multiuser multicell distributed antenna systems orthogonal transmission remote radio units single antenna spatial macro diversity spatial separation transmission strategies Antenna arrays Array signal processing Interchannel interference Joints Transmitting antennas space division multiplexing multiple input multiple output systems Antenna arrays transmission strategies amsonic acid defensive aids suite Interchannel interference cellular system transmitting antennas spatial separation MIMO communication prediction coding cellular radio array signal processing diversity reception

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Amplify-and-forward secondary spectrum access in multicarrier cognitive radio systems 3

Amplify-and-forward secondary spectrum access in multicarrie...

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IEEE International Workshop on Measurements and Networking (M&N)

作者： Darsena, Donatella Gelli, Giacinto Verde, Francesco Univ Parthenope Dipartimento Ingn Naples Italy Univ Federico II Dipartimento Ingn Elettr & Tecnol Informaz Naples Italy

ISBN: (纸本)9781479918607

Innovative spectrum sharing policies, possibly leveraged by cognitive radio (CR) technologies, are expected to play a significant role in forthcoming 5G systems, employing multicarrier techniques for modulation and multiple-access. In this paper, we propose an opportunistic amplify-and-forward relaying scheme for a multicarrier CR network, where a secondary user (SU) is allowed to share communication resources with a primary user (PU) transmitting with orthogonal frequency-division multiplexing (OFDM) technology. Instead of minimizing the interference to the PU, the SU transmitter relays the received PU signal on the different OFDM subcarriers by using a precoding matrix depending on the symbols that must be delivered to the SU receiver. The information-theoretic capacity of the proposed protocol is assessed, showing that, under mild conditions, the SU can gain a significant data-rate performance, while not degrading (but even improving) the PU performance.

关键词： 5G mobile communication OFDM modulation amplify and forward communication cognitive radio frequency division multiple access matrix algebra network coding precoding protocols radio receivers radio spectrum management radio transmitters relay networks (telecommunication) 5G system OFDM multiple access OFDM subcarrier amplify-and-forward secondary spectrum access communication resources share innovative spectrum sharing policy multicarrier cognitive radio system opportunistic amplify-and-forward relaying scheme orthogonal frequency-division multiplexing technology precoding matrix primary user protocol information-theoretic capacity secondary user receiver secondary user transmitter relay Correlation Discrete Fourier transforms Frequency-domain analysis OFDM Receivers Training Orthogonal frequency division multiplexing Frequency division multiaccess Cognitive radio Radio spectrum management discrete Fourier transform Frequency-domain analysis prediction coding radio receivers matrix algebra RADIO TRANSMITTERS Receivers Network coding protocols Functional training Plutonium

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Exact Outage Analysis for Stochastic Cellular Networks under Multi-User MIMO 17

Exact Outage Analysis for Stochastic Cellular Networks under...

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IEEE 17th Annual Consumer Communications and Networking Conference (CCNC)

作者： Kusaladharma, S. Zhu, W. -P. Ajib, W. Concordia Univ Dept Elect & Comp Engn Montreal PQ Canada Univ Quebec Montreal Dept Informat Montreal PQ Canada

ISBN: (数字)9781728138930

ISBN: (纸本)9781728138930

The next generations of cellular wireless systems promise an improved user experience with respect to the throughput, reliability, latency, and connectivity. To this end, multiple-input multiple-output (MIMO) and massive MIMO systems hold enormous potential. Moreover, due to heterogeneity and densification, user and base station locations are increasingly random. Thus, in this paper, we characterize the performance of a typical downlink user within a massive MIMO Voronoi cell when the base stations employ matched filter based precoding in the downlink We consider a typical Voronoi cell where the base stations follow a Poisson point process (PPP), and also consider the users to be randomly distributed according to a PPP independent from the base stations. Furthermore, a wireless channel with log-distance path loss and Rayleigh fading is assumed. Using a novel framework to model the signal to noise ratio, the outage probability of a user is derived in closed-form while taking into account full and partial loading for the cell's base station due to the randomness of user numbers. Numerical results show that the outage probability is heavily dependent on the base station density, and that the performance decreases when the maximum number of users served by a base station increases.

关键词： cellular radio computational geometry matched filters MIMO communication multiuser channels precoding probability Rayleigh channels stochastic processes telecommunication network reliability matched filters prediction coding multiuser channels MIMO communication telecommunication network reliability Raleigh fading channels cellular radio BASE STATION multiple input multiple output systems Computational geometry Markov chain STATIONS Probability signal to noise ratios Consumers

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Non-Linear Interference Mitigation for Broadband Multimedia Satellite Systems

Non-Linear Interference Mitigation for Broadband Multimedia ...

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International Workshop on Satellite and Space Communications

作者： Diaz, Marcos Alvarez Courville, Nicolas Mosquera, Carlos Liva, Gianluigi Corazza, Giovanni E. Univ Vigo Dept Signal Theory & Commun Vigo 36310 Spain German Aerosp Ctr DLR Inst Commun & Navigat D-82234 Wessling Germany Univ Bologna Dept Elect Comp Sci & Syst I-40126 Bologna Italy

ISBN: (纸本)9781424409389

This contribution explores the use of interference mitigation techniques applied to broadband satellite systems with co-channel interference. In particular, our focus is on nonlinear precoding techniques, borrowing ideas from the theory of broadcast MIMO channels. A number of schemes are compared, including several implementations of Tomlinson-Harashima precoding and their linear precoding counterparts. Simulations on realistic scenarios show potential improvements of non-linear precoding with respect to linear interference mitigation and classical countermeasures based on frequency division among beams. Also, we identify several practical issues related to the implementation of Tomlinson-Harashima Precoding in satellite communication systems.

关键词： disturbance suppression Satellite systems prediction coding Satellite communication systems Cochannel interference Frequency division broadband

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Hybrid Precoding for Millimeter Wave Systems With a Constraint on User Electromagnetic Radiation Exposure 50

Hybrid Precoding for Millimeter Wave Systems With a Constrai...

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50th Asilomar Conference on Signals, Systems, and Computers (ASILOMARSSC)

作者： Castellanos, Miguel R. Love, David J. Hochwald, Bertrand M. Purdue Univ Sch Elect & Comp Engn W Lafayette IN 47907 USA Univ Notre Dame Dept Elect & Comp Engn Notre Dame IN 46556 USA

ISBN: (纸本)9781538639542

The rapid growth of wireless technology worldwide has prompted interest in the underutilized millimeter-wave band from 30 to 100 GHz. Regulation agencies set limits on the amount of electromagnetic radiation absorbed by users, measuring dosimetric quantities such as specific absorption rate (SAR) to assess compliance. The increased rate of energy deposition in human tissue at high frequencies remains a growing concern as wireless cellular networks begin to incorporate millimeter wave technologies. In this paper, we present a baseband model for SAR-aware wireless communication and a strategy for optimal hybrid precoding in millimeter wave systems with SAR constraints.

关键词： Millimeter wave communication Density measurement Precoding Array signal processing Power system measurements Optimization prediction coding Millimeter wave communication Power system measurements density measurement array signal processing millimeter wave Energy Deposition Electromagnetic Radiation Specific absorption rate Wireless Technology

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Location-aware Adaptation and Precoding for Low Complexity IR-UWB Receivers

Location-aware Adaptation and Precoding for Low Complexity I...

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8th IEEE International Conference on Ultra-Wideband

作者： Luecken, Heinrich Zasowski, Thomas Steiner, Christoph Troesch, Florian Wittneben, Armin ETH Commun Technol Lab CH-8092 Zurich Switzerland

ISBN: (纸本)9781424422166

An environment is considered with many low complexity wireless mobile stations communicating to higher complexity stationary cluster heads. The cluster heads can determine the rough position of the mobile stations using geo-regioning. The mobile stations am not able to perform a channel estimation due to complexity reasons. We present two approaches to utilize regional channel knowledge available at the cluster head for improvement of the data detection performance at the mobile station. First, by feeding back the average power delay profile of the channel from the cluster head to the mobile station, the mobile station can adapt a filter according to this information. Second, at cluster head side the covariance matrix of the channel impulses response vectors is used for precoding optimization. Based on channel impulse responses measured in a realistic environment the performance of both approaches is evaluated. Performance gains of 1 to 3 dB compared to energy detection can be obtained.

关键词： cluster head mobile station prediction coding power delay profile data detection channel impulse response channel estimation Location awareness Complexity variance covariance matrix

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Efficient Linear Precoding for Massive MIMO Systems using Truncated Polynomial Expansion

Efficient Linear Precoding for Massive MIMO Systems using Tr...

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8th IEEE Sensor Array and Multichannel Signal Processing Workshop (SAM)

作者： Mueller, Axel Kammoun, Abla Bjoernson, Emil Debbah, Merouane Supelec Alcatel Lucent Chair Flexible Radio Gif Sur Yvette France KAUST Thuwal Makkah Province Saudi Arabia Intel Mobile Commun Sophia Antipolis France KTH Dept Signal Proc ACCESS Stockholm Sweden

ISBN: (纸本)9781479914814

Massive multiple-input multiple-output (MIMO) techniques have been proposed as a solution to satisfy many requirements of next generation cellular systems. One downside of massive MIMO is the increased complexity of computing the precoding, especially since the relatively "antenna-efficient" regularized zero-forcing (RZF) is preferred to simple maximum ratio transmission. We develop in this paper a new class of precoders for single-cell massive MIMO systems. It is based on truncated polynomial expansion (TPE) and mimics the advantages of RZF, while offering reduced and scalable computational complexity that can be implemented in a convenient parallel fashion. Using random matrix theory we provide a closed-form expression of the signal-to-interference-and-noise ratio under TPE precoding and compare it to previous works on RZF. Furthermore, the sum rate maximizing polynomial coefficients in TPE precoding are calculated. By simulation, we find that to maintain a fixed per-user rate loss as compared to RZF, the polynomial degree does not need to scale with the system, but it should be increased with the quality of the channel knowledge and signal-to-noise ratio.

关键词： multiple input multiple output systems signal to noise ratios prediction coding matrix theory Polynomial Thermoplastic elastomers New classes Closed-form solutions

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Affine precoders for reliable communications 25

Affine precoders for reliable communications

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IEEE International Conference on Acoustics, Speech, and Signal Processing

作者： Manton, JH Mareels, IY Hua, YB Univ Melbourne Dept Elect & Elect Engn Parkville Vic 3052 Australia

ISBN: (纸本)0780362934

It is known that preceding a signal prior to its transmission through an unknown finite impulse response channel facilitates the equalisation of the channel. Moreover, since linear precoders spread the spectrum, the equalisation process mitigates the effects of channel spectral nulls caused by frequency selective fading. This paper argues that certain affine precoders are more efficient than linear precoders. Here, the efficiency of a precoder is a measure of its ability to enable the receiver to recover the source signal relative to the amount of redundancy introduced by the precoder. An efficient affine precoder is heuristically derived and simulations used to demonstrate that it is superior to both the traditional training sequence method and the more recent filter bank preceding scheme. This preceding and equalisation scheme naturally extends to time varying channels.

关键词： Affine In-law prediction coding IMPULSE RESPONSE redundancy time-varying channels Communication Research Equalization Receivers Filter banks selective fading training sequence

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Interference Alignment: Precoding Subspaces Design

Interference Alignment: Precoding Subspaces Design

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13th IEEE International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)

作者： Fadlallah, Yasser Aissa-El-Bey, Abdeldjalil Amis, Karine Pyndiah, Ramesh Inst Telecom F-29238 Brest France

ISBN: (纸本)9781467309714

Recently, the capacity region of the Single Input Single Output (SISO) fading interference channel has been characterized. Its degree of freedom is upper bounded by K/2. This upperbound can be asymptotically achieved using the Interference Alignment approach (IA), proposed by Cadambe et al.. Our work aims to maximize the network sum rate of the IA scheme through the precoding subspaces design. We propose two designs. One is obtained as a closed-form solution of a constrained optimization problem when a Zero-Forcing decoding scheme is employed. The other is a generalized version of the optimized 3-user beamforming vectors design proposed by Kim et al., where a Minimum Mean Square Error receiver is utilized. This design presents a high computational complexity compared to the analytical solution obtained when assuming a ZF receiver. Simulation results illustrate the data rate performance and highlight the comparison between the different designs.

关键词： prediction coding Subspace capacity region Interference channels Mean square error Degree of freedom complexity classes Constrained optimization Upper bound asymptotic

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