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Unitary Precoding for MIMO Interference Networks

Unitary Precoding for MIMO Interference Networks

引用

IEEE Global Communications Conference

作者： Andreas Dotzler Guido Dietl Wolfgang Utschick Associate Institute for Signal Processing Technische University Munchen DOCOMO Euro-Labs and University of Applied Sciences Landshut

ISBN: (纸本)9781467309202

For MIMO interference networks, uncertainty in the spatial structure of interfering signals is a major source of performance degradation. In this work, we promote the use of linear unitary precoding, as it can be designed such that downlink transmission becomes more robust. Optimizing linear unitary precoding is a combinatorial and nonconvex problem, thus no efficient methods to compute global optimal solutions are available. Therefore, methods with reasonable complexity and acceptable performance are desired and have been investigated in research literature as well as for practical implementation. Contrary to existing work on unitary precoding, which considers receivers with a single antenna, we target scenarios with multiple receive antennas. We introduce and discuss a low-complexity method for successive user and precoder selection to enable unitary precoding for multi-antenna receivers. In addition to interference robustness, our novel method has several advantages for potential implementations, concerning the channel feedback and computation of optimal receive filters. Initial results by numerical simulations indicate that our approach has the potential to outperform existing methods.

关键词： prediction coding degradation of performance Unitary downlinking Receivers multiple input multiple output systems multiple antenna interference interference

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Hybrid Linear Precoding Strategy for Multiuser Massive MIMO Millimeter Wave Systems

Hybrid Linear Precoding Strategy for Multiuser Massive MIMO ...

引用

International Conference on Image and Signal Processing and their Applications (ISPA)

作者： Baghdad HADJI Lamya FERGANI Mustapha DJEDDOU Department of Telecommunication University of Science and Technology Algiers Algeria Communication System Laboratory Military Polytechnic School Algiers Algeria

ISBN: (纸本)9781728131573

Multiuser-MIMO Millimeter wave based communication system has been considered as a current area of research for the future communication systems to serve multi-user simultaneously with a multiple data streams. Hybrid analog/digital architecture is the most satisfied architecture of the mmWave MIMO communication objectives and can be applied at both the base and mobile stations. Thus, exploiting the hybrid pre-coding/combining techniques offered by this architecture allow the realization of the multi-stream/multi-user transmission. We propose in this paper, a low computational complexity linear hybrid precoding schemes based on classical linear precoding and SVD decompostion of each channel user to avoid information exchange by the feedback where each user is powered by hybrid architecture. The simulation results demonstrate that our proposed two-stage hybrid linear precoding schemes can achieve a higher spectral efficiency compared with existing methods where each user is equipped with a single combiner and confirms its better management of the multi-user interference.

关键词： Millimeter wave multi-user MIMO Massive MIMO Hybrid precoding MRT ZF MMSE zero frequency mean radiant temperatures Mini Mental State Examination prediction coding COMMUNICATION SYSTEMS millimeter wave Multi-user Interference HYBRID Hybrid electric vehicles composite structures Building construction ARCHITECTURE information exchange spectral efficiency

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Robust MIMO Precoding for the Schatten Norm Based Channel Uncertainty Sets

Robust MIMO Precoding for the Schatten Norm Based Channel Un...

引用

IEEE Global Communications Conference

作者： Jiaheng Wang Mats Bengtsson Bjorn Ottersten Daniel P. Palomar National Mobile Communications Research Lab (NCRL) Southeast University Signal Processing Lab ACCESS Linnaeus Center KTH Royal Institute of Technology ECE Department Hong Kong University of Science and Technology

ISBN: (纸本)9781479913510

In this paper, we consider robust MIMO precoding designs against deterministic imperfect channel state information at the transmitter (CSIT). In contrast to the existing works based on one or two particular channel uncertainty models, we consider a general uncertainty set defined by a generic matrix norm, called the Schatten norm, which includes most deterministic imperfect CSIT as special cases. Adopting worst-case robustness, the robust MIMO precoding design is formulated as a maximin problem to maximize the worst-case received signal-to-noise ratio or minimize the worst-case error probability. We show that the robust precoder admits a channel-diagonalizing structure for all Schatten norm based uncertainty sets, and then simplify the complex-valued matrix problem to a real-valued vector power allocation problem. We further show that the simplified power allocation problem can be analytically solved in a waterfilling manner, thus leading to a fully closed-form solution to the robust precoding design. Finally, we also investigate the robustness of beamforming and uniform-power transmission.

关键词： Imperfect CSIT maximin MIMO minimax Schatten norm worst-case robustness multiple input multiple output systems Minimax Robustness prediction coding Channel state information Uncertainty power splitting signal to noise ratios

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Orthogonality-Based User and Receive Antenna Selection for MIMO Broadcast Channels

Orthogonality-Based User and Receive Antenna Selection for M...

引用

IEEE Vehicular Technology Conference

作者： Xinlei Wang Yabo Li Zhaoyang Zhang Department of Information Science and Electrical Engineering Zhejiang Provincial Key Laboratory of Information Network Technology Zhejiang University

ISBN: (纸本)9781467318808

In MEMO broadcast channels, the Block Diagonal-ization (BD) transmit precoding performs better than the Zero-Forcing (ZF) transmit precoding when the user equipment has multiple receive antennas and can support multiple data streams. The number of users simultaneously supported by BD is much less than the total number of users in the system, so selecting proper users and/or receive antennas is important to achieve high overall sum capacity. So far, the capacity-based and norm-based user and receive antenna selection algorithms are proposed, which are greedy based and have much lower complexity than the brute-force based algorithms. In this paper, the orthogonality-based user and receive antenna selection algorithms are employed. The idea of the algorithm is simple, however, we show by detailed complexity analysis and extensive simulations that the orthogonality-based user and receive antenna selection achieves much better complexity and performance tradeoff than the existing capacity-based and norm-based algorithms. So, the orthogonality-based algorithms are more attractive for practical MEMO broadcast systems.

关键词： MEMO Multiuser Scheduling Broadcast Channels Capacity Precoding Block Diagonalization Receiving antennas user facility broadcast channels selection algorithm Complexity Analysis Consumers algorithms greedy method prediction coding

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Finer SVD-based Beamforming for FBMC/OQAM systems

Finer SVD-based Beamforming for FBMC/OQAM systems

引用

IEEE Global Communications Conference

作者： Daiming Qu Yu Qiu Tao Jiang Sch. of Electron. Inf. & Commun. Huazhong Univ. of Sci. & Technol. Wuhan China

ISBN: (纸本)9781509013296

The combination of singular value decomposition (SVD)-based beamforming and filter bank multicarrier with offset quadrature amplitude modulation (FBMC/OQAM) has not been successful to date. The difficulty of this combination is that, the beamformers may change dramatically between adjacent subchannels, therefore destroy the orthogonality of FBMC/OQAM real-valued symbols, under frequency selective channels. In this paper, we address this problem from two aspects: 1) an SVD-FBMC/OQAM architecture is proposed to support beamforming with finer granularity in frequency domain based on the frequency spreading FBMC (FS-FBMC) structure;2) a method is proposed to smooth the beamformers from tone to tone (FS-FBMC tone). The proposed finer beamforming and smoothing greatly improve the smoothness of beamformers, therefore effectively suppress the leaked ICI/ISI from adjacent subchannels. Simulations are conducted under the scenario of IEEE 802.11n wireless LAN. Results show that the proposed SVD-FBMC/OQAM system shares very close BER performance with its orthogonal frequency division multiplexing (OFDM) counterpart under the frequency selective channels. The proposed finer beamforming architecture may also serve as a paradigm for the combinations of other multiple-antenna (MIMO) techniques and FBMC/OQAM.

关键词： Array signal processing OFDM Interference MIMO Frequency-domain analysis Indexes Precoding Frequency-domain analysis Orthogonal frequency division multiplexing array signal processing prediction coding Beamforming multiple input multiple output systems beamformers selective channel interference OQAM

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MULTI-USER MISO BROADCASTING FOR INDOOR VISIBLE LIGHT COMMUNICATION

MULTI-USER MISO BROADCASTING FOR INDOOR VISIBLE LIGHT COMMUN...

引用

IEEE International Conference on Acoustics, Speech and Signal Processing

作者： Zhenhua Yu Robert J. Baxley G. Tong Zhou School of Electrical and Computer Engineering Georgia Institute of Technology Georgia Tech Research Institute

ISBN: (纸本)9781479903573

In this paper, we study multi-user multi-input single-output (MU-MISO) broadcasting for visible light communication (VLC). VLC differs from radio frequency communication in both baseband signal format and optical power constraints. We propose a precoding and biasing model for MU-MISO transmitter design in indoor VLC. We formulate and solve optimization problems for maximizing max-min fairness or throughput subject to per transmitting unit optical power constraint. We apply linear zero forcing and zero forcing dirty paper coding techniques and compare them in simulations.

关键词： Visible light communication Multi-input single-output (MISO) Multi-user Zero forcing Dirty paper coding Visible light communication multi-user broadcasting variable length codes Visible Light multiple-input single-output Communication Research prediction coding

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Multi-Resolution Codebook Design for Two-Stage Precoding in FDD Massive MIMO Networks 18

Multi-Resolution Codebook Design for Two-Stage Precoding in ...

引用

18th IEEE International Workshop on Signal Processing Advances for Wireless Communications (SPAWC)

作者： Qiao, Deli Qian, Haifeng Li, Geoffrey Ye East China Normal Univ Sch Informat Sci & Technol Shanghai Peoples R China East China Normal Univ Sch Comp Sci & Software Engn Shanghai Peoples R China Georgia Inst Technol Sch Elect & Comp Engn Atlanta GA 30332 USA

ISBN: (纸本)9781509030095

In this paper, we develop a new codebook design method for multi-resolution codebook based two-stage precoding scheme in massive MIMO networks in frequency division duplex (FDD) mode. A narrow-beam generated by each codeword is intended to provide coverage over certain beam range with strict constraints on the average and the variation in the radiated power. Each narrow-beam or codeword is designed based on a new performance metric, the ratio of the expected average power within the coverage beam range to that outside the beam range, i.e., beam-to-leakage ratio (BLR). An optimization problem for narrow-beam design is formulated to maximize the BLR. The codebook is generated via solving the optimization problem. Based on numerical evaluation, our novel codebook design based transmission scheme can improve the overall network throughput compared with the DFT-based and covariance based method when the angular spread of the channel is relative large or when the channel is rich scattering.

关键词： codebook design codeword narrow beam disc drives Multi-resolution prediction coding Network throughput numerical calculation multiple input multiple output systems

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ZERO-FORCING PRE-EQUALIZATION WITH TRANSMIT ANTENNA SELECTION IN MIMO SYSTEMS

ZERO-FORCING PRE-EQUALIZATION WITH TRANSMIT ANTENNA SELECTIO...

引用

IEEE International Conference on Acoustics, Speech, and Signal Processing

作者： Seyran Khademi Sundeep Prabhakar Chepuri Geert Leus Alle-Jan van der Veen Faculty of Electrical Engineering Mathematics and Computer Science TU Delft

ISBN: (纸本)9781479903573

In this paper, we jointly solve the problem of transmit antenna selection and zero-forcing (ZF) precoding in a multiple input multiple output (MIMO) system. A new problem formulation is proposed which enables efficient semi-definite programming (SDP) to solve the originally non-convex problem of antenna selection. This has been accomplished by imposing the Group Lasso sparsity promoting term in the precoding design criterium as a convex relaxation of the l_0-norm operation. For the selected set of antennas, we then minimize the overall transmit power, subject to a constraint on the maximum achievable throughput. Simulation results reveal the power saving advantage of the proposed algorithm compared to a randomly selected subset of antennas.

关键词： Multiple input multiple output (MIMO) linear precoding convex optimization antenna selection Group Lasso multiple input multiple output systems ANTENNA Transmitter power Convex function prediction coding Problem Formulation transmitting antennas

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Time Localization and Capacity of Faster-Than-Nyquist Signaling

Time Localization and Capacity of Faster-Than-Nyquist Signal...

引用

IEEE Global Communications Conference

作者： Ather Gattami Emil Ringh Johan Karlsson Bitynamics Research Ericsson Research KTH Royal Institute of Technology

ISBN: (纸本)9781479959532

In this paper, we consider communication over the bandwidth limited analog white Gaussian noise channel using non-orthogonal pulses. In particular, we consider non-orthogonal transmission by signaling samples at a rate higher than the Nyquist rate. Using the faster-than-Nyquist (FTN) framework, Mazo showed that one may transmit symbols carried by sinc pulses at a higher rate than that dictated by Nyquist without loosing bit error rate. However, as we will show in this paper, such pulses are not necessarily well localized in time. In fact, assuming that signals in the FTN framework are well localized in time, one can construct a signaling scheme that violates the Shannon capacity bound. We also show directly that FTN signals are in general not well localized in time. We also consider FTN signaling in the case of pulses that are different from the sinc pulses. We show that one may use a precoding scheme of low complexity, in order to remove the inter-symbol interference. This leads to the possibility of increasing the number of transmitted samples per time unit and compensate for spectral inefficiency due to signaling at the Nyquist rate of the non sinc pulses. We demonstrate the power of the precoding scheme by simulations.

关键词： Nyquist rate Legumes Pulses Signal Transduction Signaling Fasting bis(tri-n-hexylsiloxy)(2,3-naphthalocyaninato)silicon non-orthogonal Unit of time signals intersymbolic interference prediction coding Bit error rate

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Low-Complexity Sum Rate Maximization for Millimeter-Wave Communications

Low-Complexity Sum Rate Maximization for Millimeter-Wave Com...

引用

WSA 2017;21th International ITG Workshop on Smart Antennas

作者： Johannes Pickart Christoph Stoeckle Michael Joham Wolfgang Utschick

We consider sum rate maximization under linear baseband precoding in a multi-user multiple-input multiple-output scenario using wireless millimeter-wave communications. We present approaches based on previously existing algorithms, which test different stream configurations and use the projected gradient algorithm. By exploiting the geometrical structure of the millimeter-wave channels, we modify these methods in order to obtain a reduced computational complexity.

关键词： millimeter wave complexity classes sums Baseband multi-user multiple input multiple output systems prediction coding algorithms

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