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Space Division Full-duplex Scheme with Joint Scheduling and Precoding Design

Space Division Full-duplex Scheme with Joint Scheduling and ...

引用

Ad-Hoc and Sensor Networks Symposium

作者： Weiwei Wang Lei Song Xin Wang Tsuyoshi Hasegawa Yoshinori Tanaka Tokuro Kubo Fujitsu Research & Development Center Fujitsu Laboratories Ltd.

ISBN: (纸本)9781479966653

In-band full-duplex, allowing simultaneous transmission and reception on the same device over the same frequency, can double the spectral efficiency theoretically. However, the severe self-interference challenges the physical layer design. Thus, to simplify the interference cancellation (IC), the space division full-duplex (SDFD) is considered, where two spatial-separated transmission points (TPs), e.g., base stations, simultaneously serve the same cell in downlink (DL) and uplink (UL), respectively. In this paper, assuming the TP has digital-domain IC capability only, we study the SDFD scheme in heterogeneous network, i.e., a small cell (named SDFD-cell) is served as SDFD via macro TP (MTP) in DL and small TP (STP) in UL. Due to the inter-TP interference, the capacity of SDFD-cell is restricted by the digital-domain IC. Moreover, SDFD degrades the performance of other non-SDFD-cells. Therefore, we propose a joint scheduling and precoding design algorithm. The scheduling scheme selects a user equipment (UE) pair in the SDFD-cell for DL and UL transmissions as proportional fairness metric. Then, an optimal precoder is designed for MTP to reduce the interference in both SDFD-cell and non-SDFD-cells. The simulation results verify that the proposed algorithm can significantly improve the capacity of the SDFD-cell with limited capacity degradation in non-SDFD-cells.

关键词： space division FULL DUPLEX maltose tetrapalmitate simultaneous transmission prediction coding Heterogeneous networks Design Algorithm Physical layer BASE STATION transaction processing system reception Integrated circuits

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Universal Multi-Stage Precoding with Monomial Phase Rotation for Full-Diversity M2M Transmission

Universal Multi-Stage Precoding with Monomial Phase Rotation...

引用

IEEE Global Communications Conference

作者： Toshiaki Koike-Akino Keyong Jin Kim Milutin Pajovic Philip V. Orlik Mitsubishi Electric Research Laboratories (MERL)

ISBN: (纸本)9781479959532

Machine-to-machine (M2M) communications have been considered as an important application to connect a massively large number of different devices in networks. In particular for M2M wireless networks, low latency and high reliability are of great importance. To fulfill the requirements, a diversity technique exploiting limited resources is proposed in this paper for short-message transmissions. The proposed method uses multiple stages of fast unitary transforms and diagonal phase rotations to achieve full-diversity gain. A monomial phase rotation is also proposed to facilitate an optimization of the precoding matrix. It is verified that the proposed four-stage precoding provides universal diversity gain irrespective of channel selectivity in time and frequency, without changing monomial parameters. In addition, it is shown that the four-stage precoding based on the discrete Haar transform (DHT) achieves a full diversity while the computational complexity is significantly reduced from a log-linear order to a linear order compared to the other unitary transforms such as the discrete Fourier transform (DFT).

关键词： phase rotation unitary transform machine to machine prediction coding discrete Fourier transform channel selectivity Monomial complexity classes MULTISTAGE

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QR decomposition and Gram Schmidt Orthogonalization based low-complexity multi-user MIMO precoding

QR decomposition and Gram Schmidt Orthogonalization based lo...

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10th International Conference on Wireless Communications, Networking and Mobile Computing (WiCOM 2014)

作者： Jian Wu Shu Fang Lei Li Yang Yang Department of National key Laboratory on Communications University of Electronic Science and Technology of China Chengdu 611731 China

ISBN: (纸本)9781510804166

Block diagonalization (BD) is a well-known linear precoding scheme for multi-user multiple-input multipleoutput (MU-MIMO) downlink transmission. BD precoding achieves good performance but results in high computational complexity overheads due to two singular value decomposition (SVD) operations for each user. By replacing the first SVD operation with a less complex solution, the QR decomposition based block diagonalization (QRBD) precoding scheme reduces the computational complexity. In this paper, we present a QR decomposition and Gram Schmidt Orthogonalization (QR-GSO) based MUMIMO precoding scheme as a new approach for MUMIMO downlink transmission. The proposed scheme introduces an improved QR decomposition and Gram Schmidt Orthogonalization method to significantly reduce the computational complexity. Our results show that the proposed QR-GSO precoding scheme achieves the same performance as BD and QR-BD precoding schemes, while requiring much lower computational complexity.

关键词： BD Computational Complexity MU-MIMO Precoding QR Decomposition complexity classes prediction coding quick release Orthogonal

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Optimal Power Allocation and Optimal Precoding with Multi-Cell Processing

Optimal Power Allocation and Optimal Precoding with Multi-Ce...

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IEEE Vehicular Technology Conference

作者： Samah A. M. Ghanem Instituto de Telecomunica??es Faculdade de Engenharia da Universidade do Porto Portugal

ISBN: (纸本)9781467363365

In this paper, we investigate the optimal power allocation and optimal precoding for a cluster of two base stations (BS) which cooperate to jointly maximize the achievable rate for two users connecting to each BS in a multi-cell processing (MCP) framework. We provide a generalized fixed point equation of the optimal precoder in the asymptotic regimes of the low- and high-snr. We introduce a new iterative approach that leads to a closed form expression for the optimal precoding matrix in the high-snr regime which is known to be an NP-hard problem. Two MCP distributed algorithms have been introduced, a power allocation algorithm for the uplink (UL), and a precoding algorithm for the downlink (DL).

关键词： Cooperation MCP MMSE Mutual Information Power Allocation Precoding power splitting prediction coding microchannel plate Mini Mental State Examination Cellular processes Bahamas Optimal

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SLNR based cascaded interference align precoding in CoMP

SLNR based cascaded interference align precoding in CoMP

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11th International Conference on Wireless Communications, Networking and Mobile Computing (WiCOM 2015)

作者： Sheng Wang Youxuan Zhao Shilei Zhu Guojun Chen Zhengzhou Institute of Information Science and Technology China

ISBN: (纸本)9781510821279

In this paper, an SLNR based cascaded interference align precoding algorithm is proposed according to the study on interference suppression in downlink coordinated multipoint transmission system. In this algorithm, cascaded precoding is adopted rather than delivering channel state information (CSI) among cells to deal with inter and inner cell interference stage by stage. In the first stage, interferences from different cells are aligned to the orthogonal space of receiving matrix of the expected cell, so that interference to the expected cell can be avoided. In the second stage, SLNR precoding is adopted to suppress the interferences among users within a cell. Simulation results indicate that the proposed algorithm improves the system capacity, reduces the bit error rate, and overcomes the limitation that the amount of online users within a cell.

关键词： CoMP Interference Align Precoding SLNR prediction coding editing cascades Cells system capacity Bit error rate Transmission systems interference interference suppression of interference

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Limited feedback precoding for multiuser MIMO systems based on array preprocessing

Limited feedback precoding for multiuser MIMO systems based ...

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11th International Conference on Wireless Communications, Networking and Mobile Computing (WiCOM 2015)

作者： Hongliang Fu Chao Li Tiejun Yang Institute of Information Science and Engineering Henan University of Technology Zhengzhou China

ISBN: (纸本)9781510821279

In this paper, considering the problem of performance loss due to limited feedback in multiuser MIMO downlink systems, a novel limited feedback precoding for multiuser MIMO systems based on array preprocessing is proposed. The maximum SINR criteria is used for selecting optimal codeword from the Grassmannian codebook and perturbation codeword at the receiving, and feedback the Grassmannian precoding codeword index and perturbation codeword index to the transmitter, then the array preprocessing is used at the transmitter and receiver to get optimal capacity, and compensate for the performance loss due to the limited feedback. Simulation results show that the proposed method to ensure the cost of the feedback link, the system throughput and BER performance are improved effectively.

关键词： Array Preprocessing Limited Feedback Multiuser MIMO Precoding prediction coding multiple input multiple output systems Feedback codeword

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Directional Hybrid Precoding in Millimeter-Wave MIMO Systems

Directional Hybrid Precoding in Millimeter-Wave MIMO Systems

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IEEE Global Communications Conference

作者： Vasanthan Raghavan Sundar Subramanian Juergen Cezanne Ashwin Sampath Ozge Koymen Junyi Li Qualcomm Corporate R&D

ISBN: (纸本)9781509013296

The focus of this work is on cost and complexity-induced rank-constrained precoding for millimeter-wave (mmW) multi-input multi-output (MIMO) systems. The higher antenna dimensionality and sparse channel structure of mmW systems motivate directional precoding schemes over more complex and less robust eigen-mode-based precoding schemes. Building on a prior work that illustrated the superiority in design, robustness and performance of a directional rank-1 beamformer, this work considers higher-rank directional precoding structures for mmW systems. It is shown that directional precoders continue to enjoy similar properties in single-user MIMO (SU-MIMO) systems. But from a network efficiency consideration, it would be more worthwhile to expend the radio frequency (RF) chain resource on multi-user transmissions. Towards this goal, a directional scheduler and different directional beamforming structures are proposed here. These structures are shown to result in significant performance improvement over higher-rank SU-MIMO schemes.

关键词： multiple input multiple output systems DIRECTIONAL prediction coding performance boost millimeter wave

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Linear Precoding Based on Switched Interleaving and Limited Feedback for Interference Suppression in Downlink Multi-antenna MC-CDMA Systems

Linear Precoding Based on Switched Interleaving and Limited ...

引用

IEEE International Conference on Acoustics, Speech, and Signal Processing

作者： Yunlong Cai Rodrigo C. de Lamare Didier Le Ruyet Department of Electronics University of York York UK YO10 5DD Electronics and Communications Laboratory CNAM Paris 75141 France

ISBN: (纸本)9781424442959

In this work, a new hybrid transmit processing technique based on switched interleaving and chip-wise precoding is proposed to suppress the multiuser interference (MUI) for downlink multi-carrier code division multiple access (MC-CDMA) multiple antenna systems. A set of possible chip-interleavers are constructed and prestored at both the base station (BS) and mobile stations (MSs), which are also equipped with another codebook of quantized downlink channel state information (CSI). Each MS quantizes its own downlink CSI and feeds back the index to the BS by a low-rate feedback channel, then the selection function at the BS determines the optimum interleaver based on all users' quantized CSIs to transmit signals. Simulation results show that the performance of the proposed techniques is significantly better than prior art.

关键词： Multicarrier code division multiple access suppression of interference Downlink Bahamas option function multiple antenna Feedback prediction coding TRANSMITTING CDMA mobile communications codebook

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Hybrid precoding using long-term channel statistics for massive MIMO systems

Hybrid precoding using long-term channel statistics for mass...

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IEEE International Conference on Acoustics, Speech and Signal Processing

作者： Sungwoo Park Jeonghun Park Robert W. Heath Ali Yazdan The University of Texas at Austin Dept. of Electrical and Computer Engineering 78712 United States of America Facebook Inc. Connectivity Lab Menlo Park CA 94025 United States of America

ISBN: (纸本)9781509041183

Hybrid analog/digital precoding in the downlink of multiuser massive MIMO systems can reduce the number of RF chains hence reducing total cost and improving power efficiency. Having few RF chains, however, makes it difficult for a base station to acquire instantaneous channel state information across all antennas. We develop a hybrid technique that uses only long-term (slowly changing) channel statistics in computing the analog precoding matrix. The proposed analog precoder is designed to maximize signal-to-leakage-plus-noise ratio (SLNR) when combined with a baseband precoder. We also propose a constrained precoder design that reduces the effect of a hardware constraint where the analog precoders are realized with phase shifters.

关键词： Hybrid precoding multiuser massive MIMO correlated channel spatial channel covariance multiple input multiple output systems prediction coding Channel state information Phase shifters radiofrequency HYBRID Hybrid electric vehicles dynamic efficiency Total Costs ANTENNA Analog Analog BASE STATION

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Adaptive Clustering and CSI Acquisition for FDD Massive MIMO Systems with Two-level Precoding

Adaptive Clustering and CSI Acquisition for FDD Massive MIMO...

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IEEE Wireless Communications and Networking Conference

作者： Apostolos Destounis Marco Maso Mathematical and Algorithmic Sciences Lab Huawei Technologies France Research Center

ISBN: (纸本)9781467398152

In this paper, we target a massive multiple-input/multiple-output (MIMO) system operating in frequency-division duplexing (FDD) mode, assuming the adoption of a two-level linear precoding strategy at the BS. We propose a novel strategy to effectively acquire the channel state information (CSI) at the base station (BS). In particular, we devise a cross-layer dynamic algorithm for user grouping, CSI acquisition and user scheduling that takes into account fairness considerations, application characteristics and quality of service (QoS) constraints of the users. We assess the merit of the proposed algorithm for a proportional fairness objective by comparing its performance with what is achieved by a relevant baseline algorithm in which user grouping is static and based only on the second order statistics, i.e., joint space division and multiplexing (JSDM). Our numerical findings illustrate that the proposed algorithm outperforms the baseline in terms of both fairness and speed of convergence to a steady state, and for different network topologies.

关键词： multiple input multiple output systems Network topology disc drives Dynamic algorithms prediction coding Bahamas Quality of service space division User groups BASELINE

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