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检索条件"主题词=Prediction coding"

共 349 条记录，以下是41-50 订阅

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Tomlinson-Harashima Precoding with Soft Detection for Faster than Nyquist DP-16QAM Coherent Optical Systems

Tomlinson-Harashima Precoding with Soft Detection for Faster...

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Optical Fiber Communications Conference and Exhibition (OFC)

作者： Chang, D. Omomukuyo, O. Dobre, O. Venkatesan, R. Gillard, P. Rumbolt, C. Mem Univ Newfoundland St John NF A1B 3X5 Canada Altera Corp Newfoundland Technol Ctr Mt Pearl NF A1N 4S9 Canada

We demonstrate the feasibility of transmitting 5x32 Gbaud DP-16QAM faster-thanNyquist signals within 30 GHz spaced channels, which is enabled by the Tomlinson-Harashima precoding (THP) combined with soft -decision for... 详细信息

ISBN: (纸本)9781557529374

关键词： prediction coding Optical Systems Fasting soft decision Forward error correction pirarubicin

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Robust Sum Rate Maximization in the Multi-Cell MU-MIMO Downlink

Robust Sum Rate Maximization in the Multi-Cell MU-MIMO Downl...

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IEEE Wireless Communications and Networking Conference (WCNC)

作者： Fritzsche, Richard Fettweis, Gerhard P. Tech Univ Dresden Vodafone Chair Mobile Commun Syst D-01062 Dresden Germany

ISBN: (纸本)9781467359399;9781467359382

This paper studies linear precoding designed for the multi-cell multi-user multiple-input-multiple-output (MU-MIMO) downlink. The objective is to maximize the weighted sum rate (WSR) under imperfect channel state information (CSI) conditions and per base station (BS) transmit power constraints. The expectation of the WSR over the CSI error can be lower bounded by minimizing the expected weighted sum mean square error (MSE) assuming minimum MSE (MMSE) receive filters. The problem can be solved by an iterative algorithm which alternately calculates the MMSE receive filters given a fixed precoding matrix and vice versa. The algorithm converges to a local optimum. For the optimization of the precoding matrix under per BS power constraints, we present two robust solutions. The first one is based on the transmit Wiener filter solution under a sum power constraint combined with a consistent scaling to satisfy each per BS power constraint. In the second solution the problem is transformed into a second order cone program (SOCP) where per BS power constraints can be directly included. Simulation results show performance gains compared to robust and non-robust state of the art schemes.

关键词： state of the art Bahamas Mean square error prediction coding receive filter Mini Mental State Examination Downlink local optimum Iterative algorithms weight sums sums

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CSI Signaling for Decentralized Coordinated Beamforming in TDD Multi-cell MIMO Systems

CSI Signaling for Decentralized Coordinated Beamforming in T...

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44th Asilomar Conference on Signals, Systems and Computers

作者： Komulainen, Petri Tolli, Antti Juntti, Markku Univ Oulu Ctr Wireless Commun FI-90014 Oulu Finland

ISBN: (纸本)9781424497218

In this paper we present a novel multi-cell TDD CSI sounding concept for terminals employing multiple antennas. The objective is to support decentralized downlink beam coordination with minimal or no backhaul traffic between the base stations (BS). Each BS makes its own scheduling and precoding decisions independently, based on the locally available CSI and knowledge of the prior scheduling decisions made in the network. The concept combines interference-aware CSI sounding to busy signaling so that the sounding beams corresponding to the already allocated downlink data streams are considered as busy beams by the neighboring BSs. We experiment the concept in conjunction with simple regularized zero-forcing precoding and greedy beam scheduling.

关键词： tal demand distortion sounding bathymetric surveys Beams and girders Decentralized multiple input multiple output systems Minimal prediction coding Downlink Beamforming Bahamas

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VLSI implementation of a lattice-reduction algorithm for multi-antenna broadcast precoding

VLSI implementation of a lattice-reduction algorithm for mul...

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IEEE International Symposium on Circuits and Systems

作者： Burg, A. Seethaler, D. Matz, G. Swiss Fed Inst Technol Integrated Syst Lab CH-8092 Zurich Switzerland Vienna Univ Technol Inst Commun Radio Frequency Engn A-1040 Vienna Austria

ISBN: (纸本)9781424409204

This paper describes the first VLSI implementation of lattice reduction (LR) aided multi-antenna broadcast precoding with vector perturbation. The considered LR scheme is based on Brun's algorithm for finding integer relations. We analyze its high-level architectural issues, we devise a corresponding low-complexity implementation, and, finally, we develop a suitable VLSI architecture. The resulting circuit provides reference for the true silicon complexity of LR for broadcast precoding with vector perturbation.

关键词： VLSI broadcast antennas integrated circuit design precoding Brun''s algorithm integer relations finding lattice-reduction algorithm multiantenna broadcast precoding vector perturbation prediction coding broadcast antennas integrated circuit design multiple antenna

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RECURSIVE STREAM SELECTION FOR SUM-RATE MAXIMIZATION ON THE INTERFERENCE CHANNEL

RECURSIVE STREAM SELECTION FOR SUM-RATE MAXIMIZATION ON THE ...

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

作者： Amara, Mustapha Le Ruyet, Didier Pischella, Mylene CNAM CEDRIC LAETITIA F-75003 Paris France

ISBN: (纸本)9781467309714

This paper presents a successive stream selection algorithm than can be used for the interference channel. The proposed solution is a stream-wise construction of the precoding and decoding vector sets. These beams are selected to minimize the interference between the selected streams based on the projections of the nominal directions derived via SVD. The projections are made such that the obtained new stream is in both null spaces of the receiving and transmitting directions of all previously selected streams. This means that it interferes the least with the other selected streams and is also weakly interfered by them.

关键词： Interference channels streams rivers prediction coding Recursive

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On the Feasibility of Precoding-Based Network Alignment for Three Unicast Sessions 2012

On the Feasibility of Precoding-Based Network Alignment for ...

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IEEE International Symposium on Information Theory

作者： Meng, Chun Ramakrishnan, Abinesh Markopoulou, Athina Jafar, Syed Ali Univ Calif Irvine Dept Elect Engn & Comp Sci Irvine CA 92717 USA

ISBN: (纸本)9781467325790

We consider the problem of network coding across three unicast sessions over a directed acyclic graph, when each session has min-cut one. Previous work by Das et al. adapted a precoding-based interference alignment technique, originally developed for the wireless interference channel, specifically to this problem. We refer to this approach as precoding-based network alignment (PBNA). Similar to the wireless setting, PBNA asymptotically achieves half the minimum cut;different from the wireless setting, its feasibility depends on the graph structure. Das et al. provided a set of feasibility conditions for PBNA with respect to a particular precoding matrix. However, the set consisted of an infinite number of conditions, which is impossible to check in practice. Furthermore, the conditions were purely algebraic, without interpretation with regards to the graph structure. In this paper, we first prove that the set of conditions provided by Das. et al are also necessary for the feasibility of PBNA with respect to any precoding matrix. Then, using two graph-related properties and a degree-counting technique, we reduce the set to just four conditions. This reduction enables an efficient algorithm for checking the feasibility of PBNA on a given graph.

关键词： efficient algorithm Network coding aluminium wireless prediction coding Directed Acyclic Graph Unicast

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Vector quantized phase shift analog beamformers for millimeter-wave systems 6

Vector quantized phase shift analog beamformers for millimet...

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IEEE Latin-America Conference on Communications LATINCOM

作者： Benvenuto, N. Montagner, S. Pilloni, L. Univ Padua Dept Informat Engn I-35100 Padua Italy

ISBN: (纸本)9781479971626

Millimeter-wave (MMW) is a probable technology for the future cellular systems. Its main challenge is achieving sufficient operating link margin, and directional beamforming with large antenna arrays may be a viable approach. With bandwidths on the order of gigahertz, high-resolution analog-to-digital converters are a power consumption bottleneck. One solution is to employ an hybrid implementation, digital at baseband and analog at radio frequencies. In this paper we develop two iterative hybrid beamforming design algorithms for the MMW channel, using vector quantization of the analog beamformers. The proposed algorithms accounts for the RF precoding constraints and assumes the channel matrix is known but not the ray phase vector responses. We compare the proposed algorithms with the state-of-art hybrid schemes and the simulation results show that performance of the proposed algorithms can approximate that of the maximum-ratio-beamforming upper bound even if computational complexity may be higher for systems with small number of antennas.

关键词： array signal processing cellular radio millimetre wave antenna arrays precoding vector quantisation MMW channel RF precoding constraints channel matrix directional beamforming future outdoor cellular systems high-resolution analog-to-digital converters iterative hybrid beamforming design algorithms large antenna arrays maximum-ratio-beamforming millimeter-wave systems operating link margin vector quantization vector quantized phase shift analog beamformers Algorithm design and analysis Antenna arrays Approximation algorithms Array signal processing Computational complexity Radio frequency Vectors Vector quantization Antenna arrays array signal processing millimetre wave antenna arrays channel matrix radiofrequency Algorithm design and analysis millimeter wave prediction coding complexity classes cellular radio Approximation algorithms beamformers

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An SNR-Aware Inter-Symbol Data-Mapping Precoding Scheme for Single-Carrier Systems

An SNR-Aware Inter-Symbol Data-Mapping Precoding Scheme for ...

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IEEE Asia Pacific Conference on Circuits and Systems (APCCAS)

作者： Lin, Ying-Tsung Chen, Sau-Gee Natl Chiao Tung Univ Dept Elect Engn Hsinchu Taiwan Natl Chiao Tung Univ Inst Elect Hsinchu Taiwan

ISBN: (纸本)9781457717284;9781457717291

This work proposes an inter-symbol data-mapping (ISDM) precoding scheme, which allows the receiver to adaptively select its most suitable data decoder based on the estimated SNR or channel conditions, for single carrier systems. For conventional modulation schemes, the only decoding method for traditional modulations, such as PSK and QAM, is to apply the maximum likelihood (ML) method after channel equalizations. Moreover, if the estimated SNR is unreliable enough to correctly decode the incoming signal, the received frame is usually discarded. As such, the communication system has to lower the symbol modulation order and re-transmit the data. The proposed ISDM scheme rearranges and re-maps a block of data bits to be transmitted so that they are correlated. Then, the receiver can decode the received signal by dynamically selecting the following three proposed decoders: postequalization ML (PEML) decoder, full-rate most-significant-bit (FR-MSB) decoder and down-rate (DR) decoder based on estimated channel SNRs. For the FR-MSB decoder, its performance is close to the conventional BPSK decoder. On the other hand, PEML decoder can have roughly 2dB better performance than the FR-MSB one, while the DR decoder performs poorer than the FR-MSB one but with a lower computational complexity. Although the DR decoder has lower performance than the other two, its major advantage is able to decrease the ADC sampling rate with the help of multi-phase PLL. As such, the ISDM precoding scheme can provide the system better flexibility in data decoding.

关键词： CARRIER SYSTEM decoders data maps prediction coding DEcoding COMMUNICATION SYSTEMS DR Quadrature amplitude modulation

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On Interference-Aware Precoding for Multi-Antenna Channels with Finite-Alphabet Inputs

On Interference-Aware Precoding for Multi-Antenna Channels w...

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IEEE International Conference on Communications (ICC)

作者： Zeng, Weiliang Xiao, Chengshan Lu, Jianhua Tsinghua Univ Dept Elect Engn Tsinghua Natl Lab Informat Sci & Technol State Key Lab Microwave & Digital Commun Beijing 100084 Peoples R China

ISBN: (纸本)9781457720536

This paper investigates the interference-aware linear precoder design with finite-alphabet inputs. It maximizes the mutual information between the transmitter and intended receiver while controlling the interference power caused to unintended receivers. For this nonconcave problem, this work proposes a global optimization approach, which is based on two key observations: 1) the interference-aware precoding problem can be reformulated to the problem minimizing a function with bilinear terms over the intersection of multiple co-centered ellipsoids;2) these bilinear terms can be relaxed by their convex and concave envelopes. In this way, the global optimal solution is obtained by solving a sequence of relaxed problems over shrinking feasible regions. The proposed algorithm calculates the optimal precoder and the theoretical limit of the transmission rate with interference constraints. Thus, it offers an important benchmark for performance evaluation of interference constrained networks.

关键词： multiple antenna interference power prediction coding Interference constraints bilinearity TRANSMISSION RATE Global optimization Performance Evaluation Transmitters Receivers Convexity

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Transmit Preprocessing using Channel Selection for Multi-antenna Ultra-Wideband Communications 72nd

Transmit Preprocessing using Channel Selection for Multi-ant...

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IEEE 72nd Vehicular Technology Conference Fall 2010

作者： Wang, Taotao Lv, Tiejun Beijing Univ Posts & Telecommun Key Lab Universal Wireless Commun Minist Educ Beijing 100876 Peoples R China

ISBN: (纸本)9781424435746

In this paper, we propose a novel transmit preprocessing scheme using Channel Selection (CS) to jointly design PreRake and Precoding for multiple-input multiple-output Ultra-Wideband (MIMO-UWB) communications. The PreRake technique is implemented to exploit the advantage of multipath diversity and can achieve spatial multiplexing based on our proposed CS. The combination of CS and PreRake transforms the UWB frequency selective fading channel into an equivalent flat fading channel and an equivalent channel matrix (ECM) is calculated. CS can construct the ECM as a well-conditioned matrix so that higher data transmission rate can be provided by spatial multiplexing. Then, Precoding method can be introduced to enhance system performance via diagonalizing the ECM. The simple but effective channel inversion (CI) precoding is employed in the proposed transmit preprocessing scheme which we denote as CS-CI-PreRake. Simulations results show the proposed scheme achieves a solid performance.

关键词： space division multiplexing carbon monosulfide prediction coding flat fading channel electronic countermeasures Frequency-selective fading channels conditioned stimulus Exceptional Case Marking Ultra wideband technologies Scheme Cesium System performance CONTAINMENT SPRAY Data transfer rates

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