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检索条件"主题词=Linear precoding"

共 343 条记录，以下是151-160 订阅

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Hybrid Diversity Maximization precoding for the Multiuser MIMO Downlink

Hybrid Diversity Maximization Precoding for the Multiuser MI...

引用

IEEE International Conference on Communications (ICC)

作者： Khalid, Farhan Speidel, Joachim Univ Stuttgart Inst Telecommun D-70569 Stuttgart Germany

ISBN: (纸本)9781612842332

In this paper, we present a high-performance hybrid linear precoding scheme for the downlink of multiuser multiple-input multiple-output (MU-MIMO) systems based on the combination of an iterative modified regularized block diagonalization (IMRBD) precoding and minimum mean square error (MMSE) precoding. The proposed hybrid diversity maximization (HDM) scheme aims to maximize the diversity gain by means of this dual-stage precoding strategy while maintaining relatively low complexity. The simulation results show that HDM precoding can provide comparable or even better performance than other iterative precoding schemes, including some of the more complex ones.

关键词： Diversity linear precoding minimum mean square error (MMSE) multiple-input multiple-output (MIMO) multiuser MIMO (MU-MIMO)

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MINIMUM PROBABILITY-OF-ERROR PERTURBATION precoding FOR THE ONE-BIT MASSIVE MIMO DOWNLINK

MINIMUM PROBABILITY-OF-ERROR PERTURBATION PRECODING FOR THE ...

引用

IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： Swindlehurst, A. Saxena, A. Mezghani, A. Fijalkow, I. Univ Calif Irvine Ctr Pervas Commun & Comp Irvine CA 92697 USA Univ Cergy Pontoise CNRS UMR 8051 ETISENSEA F-95000 Cergy France

ISBN: (纸本)9781509041176

linear precoders have been shown to perform reasonably well at low SNR when the basestation of a MIMO downlink employs one-bit digital-to-analog converters to quantize the precoder outputs. However, at medium-to-high SNRs, an error floor is encountered due to the coarse quantization. This paper examines methods for slightly perturbing the transmitted signal prior to quantization in an effort to improve downlink performance at higher SNRs. The perturbation is performed with the goal of minimizing the worst-case probability of error among the user terminals, and assumes that the symbols to be transmitted are drawn from a finite alphabet constellation. Two different types of perturbations are studied, and it is found via simulation that the methods can provide dramatic gains in downlink performance.

关键词： one-bit quantization massive MIMO linear precoding perturbation precoding minimum probability of error precoding

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SECRECY SUM-RATES WITH REGULARIZED CHANNEL INVERSION precoding UNDER IMPERFECT CSI AT THE TRANSMITTER

SECRECY SUM-RATES WITH REGULARIZED CHANNEL INVERSION PRECODI...

引用

IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： Geraci, Giovanni Couillet, Romain Yuan, Jinhong Debbah, Merouane Collings, Iain B. Univ New South Wales Sydney NSW 2052 Australia CSIRO ICT Ctr Sydney NSW 2070 Australia Supelec Dept Telecommun Gif Sur Yvette France Supelec Alcatel Lucent Chair Flexible Radio Gif Sur Yvette France

ISBN: (纸本)9781479903566

In this paper, we study the performance of regularized channel inversion precoding in MISO broadcast channels with confidential messages under imperfect channel state information at the transmitter (CSIT). We obtain an approximation for the achievable secrecy sum-rate which is almost surely exact as the number of transmit antennas and the number of users grow to infinity in a fixed ratio. Simulations prove this anaylsis accurate even for finite-size systems. For FDD systems, we determine how the CSIT error must scale with the SNR, and we derive the number of feedback bits required to ensure a constant high-SNR rate gap to the case with perfect CSIT. For TDD systems, we study the optimum amount of channel training that maximizes the high-SNR secrecy sum-rate.

关键词： Physical layer security limited feedback broadcast channel random matrix theory linear precoding

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Artificial-Noise-Aided precoding Design for Multi-User Visible Light Communication Channels

Artificial-Noise-Aided Precoding Design for Multi-User Visib...

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IEEE International Conference on Communications (ICC) / Workshop on Integrating UAVs into 5G

作者： Pham, Thanh V. Hayashi, Takafumi Pham, Anh T. Univ Aizu Comp Commun Lab Aizu Wakamatsu Fukushima Japan Niigata Univ Dept Informat Engn Niigata Japan

ISBN: (纸本)9781538643280

Secure transmission is becoming an essentially important aspect in visible light communication (VLC). In this paper, we investigate the designs of artificial noise (AN)-aided precoding to improve physical layer security in a multi-user single eavesdropper wiretap VLC channels. The AN-aided precoding is designed to solve the max-min fairness signal-to-interference-plus-noise ratio (SINR) problem among users in two different scenarios: unknown and known eavesdropper's channel state information (CSI) at the transmitter. In the former case, we adopt the traditional null-space AN scheme and then study the impact of the AN power on the fairness performance. In the case of known eavesdropper's CSI, the AN-aided precoding is designed in such a way that keeps the SINR of the eavesdropper below a predefined threshold. Numerical results show that in both cases, the design could significantly degrade the quality of the eavesdropper's channel, thus enhancing communication secrecy.

关键词： multi-user VLC physical layer security artificial noise linear precoding

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Limited Feedback MIMO precoding via Alternating Multiple Differential Codebooks

Limited Feedback MIMO Precoding via Alternating Multiple Dif...

引用

IEEE 11th Malaysia International Conference on Communications (MICC)

作者： Zou, Jun Wang, Michael Yang, Chunliang Hua, Min Yang, Wenjie

ISBN: (纸本)9781479915323

Differential codebook precoding is known as a capacity-achieving precoding scheme when the channel variation is slow. However, at medium to high channel variation speeds the differential codebook optimized for low channel variation speeds performs poorly compared to other precoding schemes, thereby limiting its application to practical systems. In this paper, we apply an alternating codebook technique to differential precoding to improve its robustness to high channel variability. The basic idea is creating multiple (instead of single) differential codebooks optimized for various channel variation speeds, and alternating these codebooks over time providing a virtually larger differential codebook, containing various precoding matrices optimized for different speeds, without the need for additional feedback overhead. Simulation results show that the proposed alternating differential codebook scheme not only retains the superior performance of differential precoding at low channel variation rate but, at the same time, reduces the sensitivity to high speed channel variations, resulting in a more practical precoding scheme.

关键词： Multiple-Input Multiple-Output linear precoding limited feedback differential feedback temporal correlation

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An adaptive precoding scheme in MIMO systems

An adaptive precoding scheme in MIMO systems

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International Conference on Information Technology and Industrial Engineering

作者： Zheng, Feng Shi, Yang Chen, Yijian Beijing Univ Posts & Telecommun Beijing 100088 Peoples R China ZTE Corp Wireless Res Dept Shenzhen Peoples R China

ISBN: (纸本)9781845648442;9781845648435

This paper proposes an adaptive precoding technology for Multiple user Multiple-Input Multiple-Output (MU-MIMO) systems based on these typical precoding models's characteristics. The main idea of the adaptive scheme is switching precoding mode among these typical precoding schemes. Through observing, I find that the BER performance by using linear precoding is better than that by taking nonlinear precoding when SNR is low. The BER performance by using linear precoding is worse than that by taking nonlinear precoding when SNR is high. Then, an adaptive precoding scheme combines linear and nonlinear precoding technologies when the critical point of SNR is found. In addition, based on different configuration of User Equipment, it uses more specific precoding mode so that it makes further improvement on performance and reduces cost. In this way, this adaptive precoding scheme is considered performance in MIMO systems and complexity degree synthetically. Therefore, adaptive precoding scheme is more efficient and dynamic than traditional precoding scheme.

关键词： MIMO systems linear precoding nonlinear precoding adaptive precoding

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An Improved AOR-Based precoding for Massive MIMO Systems 18

An Improved AOR-Based Precoding for Massive MIMO Systems

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4th International Conference on Communication and Information Processing (ICCIP)

作者： Wu, Jiayu Hu, Yanjun Wang, Yi Anhui Univ Minist Educ Key Lab Intelligent Comp & Signal Proc Hefei Peoples R China

ISBN: (纸本)9781450365345

Compared with traditional multiple-input-multiple-output (MIMO) systems, the number of base station (BS) antennas increased in massive MIMO systems. However, due to the huge number of antennas, linear precoding schemes are able to achieve the near-optimal performance. Conventional linear precoding schemes such as regularized zero forcing (RZF) precoding need to calculate the matrix inversion of large size which leads to high computational complexity. Although utilizing iterative algorithm approximate instead of matrix inversion can reduce the complexity, it leads to slow convergence or general bit error rate (BER) performance. To solve this problem, we proposes a linear precoding scheme based on the accelerated over relaxation (AOR) method. Moreover, we propose a simple way to choose the optimal accelerate factor so that it is only related to the system parameters and more suitable for practical application. Simulation results prove that the improved AOR-based precoding could convergence faster and had better performance of bit error rate (BER).

关键词： Massive multiple-input multiple-output (MIMO) linear precoding the improved AOR-based precoding

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Space-Time Block Coded Spatial Modulation Aided mmWave MIMO with Hybrid precoding 26

Space-Time Block Coded Spatial Modulation Aided mmWave MIMO ...

引用

26th IEEE Signal Processing and Communications Applications Conference (SIU)

作者： Elganimi, Taissir Y. Elghariani, Ali A. Univ Tripoli Elect & Elect Engn Dept Tripoli Libya

ISBN: (纸本)9781538615010

In this paper, a combination of Space-Time Block Coded Spatial Modulation with Hybrid Analog-Digital Beamforming (STBC-SM-HBF) for 60 GHz Millimeter-wave (mmWave) communications is proposed in order to take advantage of the merits of Spatial Modulation (SM), Space-Time Block Codes (STBC), Analog Beamforming (ABF), and digital precoding techniques while avoiding their drawbacks. This proposed system benefits from the multiplexing gain of SM, from the transmit diversity gain of STBC and from the Signal-to-Noise Ratio (SNR) gain of the beamformer. The simulation results demonstrate that the Zero Forcing (ZF) and the Minimum Mean Square Error (MMSE) precoded STBC-SM systems have better Bit Error Rate (BER) performance than the precoded SM system, and the former showed a performance degradation compared to STBC-SM system tough. Furthermore, the error performance is significantly improved by employing an array of ABF which improves the system performance as the number of antenna array elements increases due to providing a beamforming gain, which is hence of great significance to the Fifth Generation (5G) mmWave communications. In addition, it is demonstrated that a minimum of 2 antenna elements in the proposed scheme of STBC-SM-HBF are required to obtain better error performance than that of the conventional SM and STBC-SM systems under the same spectral efficiency of 2 bits/s/Hz.

关键词： Millimeter-wave Spatial Modulation Space-Time Block Coding Analog Beamforming linear precoding

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Maximum ratio combining precoding for multi-antenna relay systems

Maximum ratio combining precoding for multi-antenna relay sy...

引用

IEEE International Conference on Communications (ICC 2008)

作者： Bahrami, Hamid Reza Le-Ngoc, Tho McGill Univ Dept ECE Montreal PQ H3A 2A7 Canada

ISBN: (纸本)9781424420742

This paper addresses the problem of design of practical communication strategies for multi-antenna amplify-and-forward and decode-and-forward relay systems. We show that simple linear techniques at source and destination in conjunction with maximum ratio combining can provide an optimal transmission strategy in terms of received SNR without imposing a huge computational load over the relay node(s). Besides the structure of precoding matrices are very similar at source and relay nodes, which reduces the complexity as all nodes can play the role of source and relay nodes without changing their transmission structure. Numerical results show that the proposed transmission and reception techniques can improve the received SNR, and hence enhance the ergodic capacity.

关键词： cooperation relay system linear precoding maximum ratio combining

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GAME THEORY FOR precoding IN A MULTI-USER SYSTEM: BARGAINING FOR OVERALL BENEFITS

GAME THEORY FOR PRECODING IN A MULTI-USER SYSTEM: BARGAINING...

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IEEE International Conference on Acoustics, Speech and Signal Processing

作者： Gao, Jie Vorobyov, Sergiy A. Jiang, Hai Univ Alberta Dept Elect & Comp Engn Edmonton AB Canada

ISBN: (纸本)9781424423538

A precoding strategy for multi-user spectrum sharing over an interference channel is proposed and analyzed from a game-theoretic perspective. The proposed strategy is based on finding the Nash bargaining solution for precoding matrices in a cooperative scenario over frequency selective channels under a spectrum mask constraint. An in-time update of the precoding matrices is enabled by using time slots to guarantee the effectiveness of the bargaining solution when the number of users varies. A dual decomposition approach is exploited to construct a distributed structure for solving the bargaining problem. The proposed distributed algorithm realizes the physical process of bargaining, which is not present in the Nash bargaining theory.

关键词： linear precoding interference channel Nash bargaining cooperative game duality dual decomposition

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