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检索条件"主题词=physical-layer network coding"

共 260 条记录，以下是251-260 订阅

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NO-V2X: Non-orthogonal Multiple Access with Side Information for V2X Communications 1

引用

European-Alliance-for-Innovation (EAI) International Conference on Smart Grid and Innovative Frontiers in Telecommunications (SmartGIFT)

作者： Situ, Zhenhui Ho, Ivan Wang-Hei Hong Kong Polytech Univ Dept Elect & Informat Engn Hung Hom Hong Kong Peoples R China Hong Kong Polytech Univ Shenzhen Res Inst Shenzhen Peoples R China

ISBN: (数字)9783319949659

ISBN: (纸本)9783319949659;9783319949642

We study a vehicle-to-everything (V2X) communication scenario where multiple vehicles coming from different road segments converge at a road junction and exchange their information via a road side unit. The high-mobility of vehicles determines that the communication is time-critical. If conventional orthogonal multiple access (OMA) is applied, not only the orthogonal resource allocation but also the scheduling overheads will incur significant delay. In addition, orthogonal domain may not be identified within short contact time among vehicles and the road-side unit. In contrast, non-orthogonal multiple access (NOMA) can provide low-delay and reliable communication by exploiting the overlapped or collided signals. In this paper, we investigate the application of NOMA with side information in V2X communications as the Non-orthogonal V2X (NO-V2X) scheme. NO-V2X takes the advantage of side information and physical-layer network coding (PNC) to increase the decoding success rate in the uplink phase and to reduce the required transmission power in the downlink phase. Our simulation results show that NO-V2X outperforms OMA and the conventional NOMA with successive interference cancellation (SIC).

关键词： Non-orthogonal multiple access V2X communication Side information physical-layer network coding network-coded multiple access

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TWO-WAY RELAYING VIA MODULO-AND-FORWARD FOR MIMO SIGNAL TRANSMISSION

TWO-WAY RELAYING VIA MODULO-AND-FORWARD FOR MIMO SIGNAL TRAN...

引用

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

作者： Lin, David W. Chung, I-Chou A. Natl Chiao Tung Univ Dept Elect Engn Hsinchu 30010 Taiwan Natl Chiao Tung Univ Inst Elect Hsinchu 30010 Taiwan

ISBN: (纸本)9781479903566

Two-way relaying via the amplify-and-forward technique has received much recent attention. A modulo-and-forward (MF) variant of it has recently been proposed for single-antenna transmission, which c an significantly reduce the peak and average relay transmission powers. The present work considers two-way relaying for multi-input multi-output (MIMO) signal transmission. We propose an MF technique for Alamouti space-time coding and spatial multiplexing. Simulation results confirm the advantage of the proposed technique in enhancing the peak and average power efficiency of the relay.

关键词： MIMO modulo-and-forward physical-layer network coding two-way relay

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Convolutional Codes in Two-Way Relay networks with Rate Diverse network coding

Convolutional Codes in Two-Way Relay Networks with Rate Dive...

引用

World Congress on Information and Communication Technologies

作者： Ping Cheng Jianjun Hao Yijun Guo Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications

ISBN: (纸本)9781467348065

In two-way relay networks (TWRNs) with physical-layer network coding (PNC), introduction of convolutional codes is able to enhance the overall system reliability. In addition, the relay node has to determine a particular broadcast rate for coded packets transmission as the selected rate should be supported on the worst quality links to the intended receivers. Thus, the throughput gain brought by network coding is limited by capacity of the worst link in TWRNs. In this paper, a novel symbol-level rate diverse network coding (RDNC) scheme and reduced-state decoding scheme for convolutional codes are proposed to address the two problems. In this setup, for a given memory length constraint, two source nodes can adopt convolutional codes of different lengths and use reduced-state trellis to reduce decoding complexity. In this work, it is shown that the proposed approach is able to improve system throughput significantly, offer increased reliability, and reduce the complexity of convolutional codes decoding at the same time.

关键词： Two-way relay network physical-layer network coding Rate diverse network coding Multiple access channel Convolutional code Viterbi algorithm Rate-diverse broadcast Wireless link quality

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Wireless MIMO Switching with Trusted and Untrusted Relays: Degrees of Freedom Perspective

Wireless MIMO Switching with Trusted and Untrusted Relays: D...

引用

IEEE International Conference on Communications

作者： Fanggang Wang Xiaojun Yuan Jemin Lee Tony Q. S. Quek State Key Lab of Rail Traffic Control and Safety Beijing Jiaotong University School of Information Science and Technology ShanghaiTech University Singapore University of Technology and Design

ISBN: (纸本)9781467364300

We investigate the degrees of freedom (DoF) and secrecy DoF for a general framework of multiway relay networks named wireless MIMO switching, where a number of users exchange information via a common relay. Each round of data exchange consists of one uplink transmission from users to relay and one downlink transmission from relay back to users. The data exchange model is unicast, i.e., every user transmits one message and intends to receive one message from one other user. We categorize unicast patterns using the notion of orbit borrowed from abstract algebra. Roughly speaking, an orbit is a minimum subset of users such that data exchange is closed within this subset. We analyze the achievable DoF of wireless MIMO switching with various numbers of orbits. Particularly, the DoF capacity for unicast with one and two orbits are established. Furthermore, we study communication secrecy with an untrusted relay in wireless MIMO switching. We present an achievable secrecy sum rate and the corresponding achievable secrecy DoF by assuming a non-regenerative relay. Then, we focus on unicast patterns with one and two orbits, and show that this achievable lower bound is actually the secrecy DoF capacity based on a novel genie-aided technique. Our results build a bridge between the DoF and the secrecy DoF in multiway relaying. The methodology of the proof can be generally applied to analyze the secrecy DoF in other relay networks.

关键词： Degrees of freedom MIMO switching physical-layer network coding Multiway relay Secrecy sum rate

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A Comparative Analysis of Secrecy Rates of Wireless Two-Way Relay Systems

A Comparative Analysis of Secrecy Rates of Wireless Two-Way ...

引用

IEEE Global Communications Conference

作者： Chih-Hua Chang Ronald Y. Chang Yu-Chih Huang School of Electrical and Computer Engineering Purdue University Research Center for Information Technology Innovation Academia Sinica Department of Communication Engineering National Taipei University

ISBN: (纸本)9781479959532

This paper studies the information-theoretic secrecy rates of wireless two-way relay systems where two users wish to exchange information through a single relay with an eavesdropper observing all communications. We formulate and compare the achievable secrecy rates of the system that employs one of the three common relay protocols: conventional decode-and-forward (DF), DF with network coding (NC), and compute-and-forward (CF) based on physical-layer network coding (PNC). We show that CF based on PNC achieves the highest secrecy rate at high signal-to-noise ratio (SNR), while, interestingly, the other two protocols have mixed performance depending on the power allocation scheme and network topology. Our study offers insights into designing wireless two-way relay protocols from a secrecy perspective.

关键词： Two-way relaying Information-theoretic security physical-layer security network coding physical-layer network coding network coding Relay systems Privacy Bidirectional physical layer PNC signal to noise ratios wireless computer information security power splitting relay

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Full-duplex MIMO and PLNC for the Y-network

Full-duplex MIMO and PLNC for the Y-network

引用

Mediterranean Electrotechnical Conference (MELECON)

作者： Filipe E. Ferreira Francisco A. Monteiro Ivo Sousa Instituto de Telecomunicações Portugal ISCTE - Instituto Universitário de Lisboa Portugal Instituto Superior Técnico Universidade de Lisboa Portugal

ISBN: (纸本)9781509000593

This paper considers a multi-way wireless network with three terminals which want to exchange or share data with the help of a relay: each terminal has some information that wants to transmit to the other two. The traditional way of doing this exchange either involves time-domain multiplexing (TDMA) or dedicated frequency-domain disjoint channels, at the expense of high bandwidth inefficiency. With the advent of network coding, and later physical-layer network coding, it became possible to reduce the number of time slots required to exchange the information between all the terminals. Moreover, using multiple-input multiple-output (MIMO) terminals and relays, the time-usage efficiency can be further boosted by transferring the burden from the time-domain to the spatial-domain via spatial multiplexing. This paper proposes the concatenation of the aforementioned techniques along with loopback interference cancellation, which recently became a central topic for the next generation of the physical-layer of wireless communications. The paper shows a protocol and techniques that allow all the information exchange between terminals to be reduced from the 6 time-slots, required in traditional TDMA, to one time-slot only, provided that the information packets are not too short. The error performance of this system is shown by means of simulation using MIMO Rayleigh fading channels.

关键词： MIMO Multi-way channel full-duplex interference suppression physical-layer network coding FULL DUPLEX multiple input multiple output systems suppression of interference physical layer information exchange network coding Device Terminal error performance

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Performance of physical-layer network Coded Multi-Way Relay Channels with Binary Signaling

Performance of Physical-Layer Network Coded Multi-Way Relay ...

引用

IEEE Pacific Rim Conference on Communications, Computers and Signal Processing

作者： Shaham Sharifian T. Aaron Gulliver Department of Electrical and Computer Engineering University of Victoria

ISBN: (纸本)9781479915002

The problem of full data exchange in multi-way relay channels (MWRCs) was considered in [1]. The algorithm proposed provides a throughput of 1/1.5N symbol per user per channel use (sym/U/CU) with binary signaling, which is a 33% increase compared to traditional relaying. In this paper, we analyze the average total energy consumption of the users for the proposed algorithm and compare it with traditional relaying. We also compare the power efficiency and error performance of this relaying scheme with other relaying techniques.

关键词： Relay channels physical-layer network coding Cooperative communication relay channel cooperative communication Binary Signaling relaying hierarchical network dynamic efficiency physical layer error performance

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TWO-WAY RELAYING VIA MODULO-AND-FORWARD FOR MIMO SIGNAL TRANSMISSION

TWO-WAY RELAYING VIA MODULO-AND-FORWARD FOR MIMO SIGNAL TRAN...

引用

IEEE International Conference on Acoustics, Speech and Signal Processing

作者： David W. Lin I-Chou A. Chung Department of Electronics Engineering and Institute of Electronics National Chiao Tung University Hsinchu Taiwan 30010 R.O.C.

ISBN: (纸本)9781479903573

Two-way relaying via the amplify-and-forward technique has received much recent attention, A modulo-and-forward (MFJ variant of it has recently been proposed for single-antenna transmission, which can significantly reduce the peak and average relay transmission powers. The present work considers two-way relaying for multi-input multi-output (MIMO) signal transmission. We propose an MF technique for Alamouti space-time coding and spatial multiplexing. Simulation results confirm the advantage of the proposed technique in enhancing the peak and average power efficiency of the relay.

关键词： MIMO modulo-and-forward physical-layer network coding two-way relay

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Detection of Intelligent Malicious User in Cognitive Radio network by Using Friend or Foe (FoF) Detection Technique

Detection of Intelligent Malicious User in Cognitive Radio N...

引用

International Telecommunication networks and Applications Conference

作者： Saifur Rahman Sabuj Masanori Hamamura Shougo Kuwamura Graduate School of Engineering Kochi University of Technology

ISBN: (纸本)9781467393492

In a cognitive radio network, dynamic spectrum must be shared with an unlicensed user because of the limited bandwidth of the wireless spectrum. As a regulation of cognitive radio networks, a secondary user is allowed to utilize the unoccupied spectrum when it is not being used by the primary user. However, an intelligent malicious user can attack a cognitive radio network and block the permitted channel for the secondary user. The invasion of an intelligent malicious user is a serious problem in the deployment of such networks. In this paper, we introduce a novel scheme based on friend or foe (FoF) detection with physical-layer network coding to detect a secondary user and an intelligent malicious user. The entire cognitive radio network is protected while the secondary user and intelligent malicious user are accurately detected. The effectiveness of the proposed approach is analyzed theoretically and by MATLAB simulation. It is shown that with the FoF detection technique and the proposed algorithm, the base station can detect the secondary user and intelligent malicious user with high accuracy. Computer simulations show that the probability of detection is almost 100% and that the probability of the false alarm is almost 0% for a low E_b/N_0. Consequently, the proposed technique can be applied to a cognitive radio network to protect the entire network and ensure appropriate channel utilization by the secondary user.

关键词： Cognitive radio network Friend or foe detection physical-layer network coding Cross-correlation

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Joint Power Allocation and Beamforming for Multiuser MIMO Two-way Relay networks

Joint Power Allocation and Beamforming for Multiuser MIMO Tw...

引用

IEEE International Symposium on Personal, Indoor and Mobile Radio Communications

作者： Mohammad Khafagy Amr El-Keyi Tamer ElBatt Mohammed Nafie Wireless Intelligent Networks Center (WINC) Nile University

ISBN: (纸本)9781457713460

In this paper, a multiuser cellular two-way relaying scenario is considered where multiple single-antenna mobile stations (MSs) and one multiple-antenna base station (BS) communicate, bidirectionally, via one half-duplex multiple-antenna relay station (RS). Furthermore, the case when the number of antennas at the RS is not sufficient to decode the individual messages is addressed. For this case, a two-phase two-way relaying scenario is considered. In the first phase, the multiple access, a minimum Mean Square Error (MSE) optimization problem is formulated which is found to be non-convex. Thus, an iterative scheme is proposed to compute the MS transmit powers, the BS beamforming vectors, and the corresponding RS linear receivers to minimize the maximum MSE for multiple pairs subject to power constraints on the transmitting terminals. In the second phase, the broadcast phase, the beamforming vectors at the RS are designed to minimize the maximum MSE at the MSs subject to relay power constraints, and the receivers at the BS are designed accordingly. In a two-pair scenario, simulation results are provided showing the superior performance of the proposed methods compared to earlier approaches in terms of the bit-error rate. Also, it is shown that as the system scales up in terms of signal space dimensions and number of accommodated pairs, the performance gap between the proposed scheme and the earlier approaches increases.

关键词： MIMO two-way relaying Convex optimization physical-layer network coding Multiuser detection

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