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Power Provisioning and Relay Positioning for Two-Way Relay Channel With analog network coding

IEEE SIGNAL PROCESSING LETTERS 2011年第9期18卷 517-520页

作者： Li, Yong Zhang, Xiang Peng, Mugen Wang, Wenbo Beijing Univ Posts & Telecommun Minist Educ Univ Wireless Commun Wireless Signal Proc & Network LabKey Lab Beijing 100876 Peoples R China

We consider two end users which have asymmetric traffic requirements in terms of both data rate and outage probability. They exchange information in Rayleigh flat-fading channels, and a half-duplex relay node is employed to assist the bidirectional communication between them, using the analog network coding (ANC) protocol. The provision of power levels for each node is investigated so as to minimize the total energy consumed to satisfy the asymmetric traffic requirements. By comparing energy consumptions between ANC strategy and direct transmission strategy, the relay operating region is also identified in which relay-assisted transmission can yield higher energy efficiency than direct transmission. It also indicates that the relay node is best positioned at the middle point of the two end nodes for any asymmetric traffic requirements from the perspective of energy consumption minimization.

关键词： analog network coding energy efficiency outage probability two-way relay

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Performance of analog network coding with Asymmetric Traffic Requirements

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IEEE COMMUNICATIONS LETTERS 2011年第6期15卷 647-649页

作者： Upadhyay, Prabhat K. Prakriya, Shankar Indian Inst Technol Delhi Dept Elect Engn New Delhi 110016 India

In this letter, we evaluate the outage performance of analog network coding (ANC) protocol for a two-way half-duplex relaying system with asymmetric traffic requirements at end terminals. We derive a simple and generalized expression for overall system outage probability in a Rayleigh flat-fading environment. We also deduce the optimal relay location and power allocation in order to minimize the overall system outage. Numerical and simulation results highlight the effect of optimal relay positioning and power allocation under various traffic requirements.

关键词： analog network coding outage probability Rayleigh fading two-way relaying

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Outage Analysis of Non-Regenerative analog network coding for Two-Way Multi-Hop networks

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IEEE COMMUNICATIONS LETTERS 2011年第6期15卷 662-664页

作者： Wang, Gengkun Xiang, Wei Yuan, Jinhong Huang, Tao Univ So Queensland Fac Engn & Surveying Toowoomba Qld 4350 Australia Univ New S Wales Sch Elect Engn & Telecommun Sydney NSW 2052 Australia

We investigate the performance of analog network coding (ANC) for multi-hop networks in this letter. With the amplify-and-forward (AF) protocol, relays broadcast the sum of two colliding signals to neighboring nodes, while the source node can subtract its own signal from the colliding signals to obtain the received information. We first give the transmission scheme expressions for the n-node m-frame two-way multi-hop network. For this scheme, we derive the end-to-end signal-to-noise ratio (SNR) expression. The closed-form expression of the outage probability for the generalized multi-hop network is evaluated. Numerical results demonstrate that the outage performance with ANC is better than that of the traditional AF scheme.

关键词： Multi-hop networks analog network coding end-to-end SNR outage probability

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Performance Bounds for analog network coding Based Two-Way Relaying with Multiuser Selection Diversity

Performance Bounds for Analog Network Coding Based Two-Way R...

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IEEE Wireless Communications and networking Conference (WCNC)

作者： Upadhyay, Prabhat K. Prakriya, Shankar Indian Inst Technol Delhi Dept Elect Engn New Delhi 110016 India

ISBN: (纸本)9781612842547

This paper evaluates the performance of an opportunistic scheduling scheme for a multiuser two-way relay network, wherein an analog network coding (ANC)-based relay assists the communication between multiple pairs of users. To ensure fairness for each user pair, we consider a scheduler based on maximizing the normalized minimum of the instantaneous signal-to-noise ratios (SNRs) at each user of the pair. Under a high SNR assumption, we derive upper and lower bound expressions for the outage probability and the average sum-rate in a Rayleigh fading environment and establish that a multiuser diversity of order equal to the number of user pairs is harnessed by the scheme. Numerical and simulation results are presented to confirm the performance gain of the proposed scheme.

关键词： network coding Protocols Rayleigh channels Rayleigh channels Rayleigh fading environment Relays Signal to noise ratio Simulation analog network coding diversity reception instantaneous signal-to-noise ratios multiple user pairs multiuser channels multiuser selection diversity multiuser two-way relay network network coding opportunistic scheduling outage probability scheduling telecommunication network reliability telecommunication network routing

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Outage Performance of analog network coding in Generalized Two-Way Multi-Hop networks

Outage Performance of Analog Network Coding in Generalized T...

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IEEE Wireless Communications and networking Conference (WCNC)

作者： Wang, Gengkun Xiang, Wei Yuan, Jinhong Huang, Tao Univ Southern Queensland Fac Engn & Surveying Toowoomba Qld 4350 Australia Univ New South Wales Sch Elect Engn & Telecommun Sydney NSW 2052 Australia

ISBN: (纸本)9781612842547

We investigate the performance of analog network coding (ANC) for multi-hop networks in this paper. With the amplify-and-forward (AF) protocol, relays broadcast the sum of two colliding signals to neighboring nodes, while the source node can subtract its own signal from the colliding signal to obtain the received information. We first give the transmission scheme expressions for the n-node m-frame two-way multi-hop network. For this scheme, we derive the end-to-end signal-to-noise ratio (SNR) expression. Without loss of generality, the closed-form expression of the outage probability for the generalized multi-hop network is evaluated. Numerical results demonstrate that the outage performance with ANC is better than the traditional scheme without ANC.

关键词： Multi-hop networks analog network coding end-to-end SNR outage probability

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Combining Cooperative Relaying and analog network coding to Improve network Connectivity and Capacity in Vehicular networks

Combining Cooperative Relaying and Analog Network Coding to ...

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54th Annual IEEE Global Telecommunications Conference (GLOBECOM)

作者： Khlass, Ahlem Ghamri-Doudane, Yacine Gacanin, Haris ENSIIE 1 Sq Resistance F-91025 Evry France Univ Paris LIGM Lab UMR 8049 PASNet Grp Paris France Alcatel Lucent Bell N V B-2018 Antwerp Belgium

ISBN: (纸本)9781424492688

Vehicular networks are a promising field in wireless networks enabling connection vehicles among themselves or between a vehicle and an infrastructure. These networks aim to offer several potential applications ranging from road safety applications and driver assistance to infotainment. However, these networks have limited coverage and capacity. Among the options that may help overcome these limitations, we can quote cooperative communications and analog network coding (ANC). The idea of this paper is to combine these two concepts in order to improve the vehicular network connectivity and capacity. The proposed solution is divided into three stages. The first stage aims at identifying the coding and relaying opportunities. The second stage uses a distributed scheme to select the Best Vehicular Relay among potential candidates when relaying is required, while the last stage performs our joint relaying and coding strategy on the received signals. In order to validate our approach, numerical analysis is performed to evaluate the performances in terms of raw Bit Error Rate (BER) and throughput. This confirmed our expectation showing that cooperative relaying achieves better performance than the direct transmission in terms of raw BER but decreases the throughput. However, by deploying analog network coding on the Best Vehicular Relay, the throughput is improved considerably at the price of a slight deterioration of the raw BER.

关键词： Vehicular networks analog network coding Relay-assisted transmission OFDM Vehicular Mobility

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Utility Maximization for Two-Way AF Relaying Under Rate Outage Constraints

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IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS 2017年第9期16卷 5762-5778页

作者： Chen, Chang-Lin Lin, Che Natl Tsing Hua Univ Hsinchu 30013 Taiwan

In this paper, we focus on maximizing the system utility (e.g., the weighted sum-rate, weighted geometric mean rate, and the harmonic mean rate) of a two-way relay network (TWRN) from the outage probability perspective;a TWRN has multiple relay nodes and two terminal nodes. We assume amplify-and-forward relaying with analog network coding protocol and half-duplex transmission with perfect channel state information at the receiver ends and channel distribution information at the transmitter ends. We derive the approximated closed-form for the outage probability of a TWRN;however, the approximated outage constraints lead to a non-convex structure for the considered problem. Based on the successive convex approximation technique, we obtain near optimal solution for the non-convex problem. Moreover, we derive closed-form solutions for the maximization problem for the weighted sum rate maximization problem for a TWRN with a single relay node and two relay nodes under individual power constraints. Our simulation results demonstrate the accuracy of our outage probability approximation model and the advantages of our algorithm over naive methods of full and uniform power allocation.

关键词： Two-way relay analog network coding convex optimization power allocation outage probability

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Beamforming in Traffic-Aware Two-Way Relay Systems With Channel Estimation Error and Feedback Delay

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IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY 2017年第10期66卷 8807-8820页

作者： Gurjar, Devendra Singh Upadhyay, Prabhat Kumar da Costa, Daniel Benevides de Sousa, Rafael Timoteo, Jr. Indian Inst Technol Indore Discipline Elect Engn Indore 453552 Madhya Pradesh India Univ Fed Ceara Dept Comp Engn BR-60020180 Sobral CE Brazil Univ Brasilia Dept Elect Engn Cybersecur INCT Unit 6 BR-70910900 Brasilia DF Brazil

This paper presents a comprehensive performance analysis of a multi-antenna-based traffic-aware two-way relay system with unavoidable imperfections in channel state information (CSI) under Nakagami-m fading. Herein, we employ transmit/receive beamforming at source nodes and analog network coding (ANC) at the relay node in the presence of CSI imperfections due to channel estimation errors (CEE) and feedback delay. With such a practical setup, we first deduce the pertinent instantaneous end-to-end signal-to-noise ratios (SNRs) after performing partial self-interference cancellation. Then, by imposing asymmetric traffic requirements in two opposite directions, we conduct an accurate analysis of overall outage probability (OOP) of the considered system. We further derive a tight lower bound on OOP that has a simple and compact closed-form representation. Moreover, based on the asymptotic OOP expression at high SNR, we examine the achievable diversity order of the system. In addition, we acquire an upper bound expression of ergodic sum-rate (ESR) and simplify it further in useful compact form for high SNR regime. Besides, we investigate the optimization problems of relay position to minimize the OOP and to maximize the ESR. Numerical and simulation results validate our theoretical analysis and highlight the impact of CEE and feedback delay under various traffic patterns on the overall system performance.

关键词： analog network coding asymmetric traffic pattern beamforming channel estimation error feedback delay Nakagami-m fading two-way relaying

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Joint impact of nodes-mobility and channel estimation error on the performance of two-way relay systems

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PHYSICAL COMMUNICATION 2017年 23卷 103-113页

作者： Meshram, Ashish K. Gurjar, Devendra S. Upadhyay, Prabhat K. Indian Inst Technol Indore Discipline Elect Engn Indore 453552 Madhya Pradesh India

This paper presents the performance analysis of a two-way relay system with nodes-mobility (NM) and channel estimation errors (CEE) under time-varying Rayleigh fading. Herein, analog network coding protocol is employed at the relay node. All the participating nodes are half-duplex and equipped with single-antenna devices. Specifically, we utilize first-order Markovian model to characterize the impact of NM in the channel. Along with the NM, we also consider that the CEE may exist in practical scenarios, where nodes require to estimate the channel state information. By incorporating these factors, we first derive the instantaneous end-to-end (e2e) signal-to-noise ratios (SNRs) at two source nodes. Then, we obtain the exact closed-form expressions for distribution and density functions of the two e2e SNRs. After that, we derive the accurate expressions of various performance metrics, viz., sum-bit error rate, overall outage probability, and ergodic sum-rate. Further, to attain more insights into the considered system, we deduce the asymptotic behavior of these performance metrics. Finally, numerical and Monte-Carlo simulation results are provided to validate our theoretical analysis and to illustrate the impact of NM and CEE on the performance measures of the considered system. (C) 2017 Elsevier B.V. All rights reserved.

关键词： Two-way relaying analog network coding Time-varying channel Nodes-mobility Imperfect channel state information

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Optimal Graph-Filter Design and Applications to Distributed Linear network Operators

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IEEE TRANSACTIONS ON SIGNAL PROCESSING 2017年第15期65卷 4117-4131页

作者： Segarra, Santiago Marques, Antonio G. Ribeiro, Alejandro MIT Inst Data Syst & Soc 77 Massachusetts Ave Cambridge MA 02139 USA King Juan Carlos Univ Dept Signal Theory & Commun Madrid 28943 Spain Univ Penn Dept Elect & Syst Engn Philadelphia PA 19104 USA

We study the optimal design of graph filters (GFs) to implement arbitrary linear transformations between graph signals. GFs can be represented by matrix polynomials of the graph-shift operator (GSO). Since this operator captures the local structure of the graph, GFs naturally give rise to distributed linear network operators. In most setups, the GSO is given so that GF design consists fundamentally in choosing the (filter) coefficients of the matrix polynomial to resemble desired linear transformations. We determine spectral conditions under which a specific linear transformation can be implemented perfectly using GFs. For the cases where perfect implementation is infeasible, we address the optimization of the filter coefficients to approximate the desired transformation. Additionally, for settings where the GSO itself can be modified, we study its optimal design as well. After this, we introduce the notion of a node-variant GF, which allows the simultaneous implementation of multiple (regular) GFs in different nodes of the graph. This additional flexibility enables the design of more general operators without undermining the locality in implementation. Perfect and approximate designs are also studied for this new type of GFs. To showcase the relevance of the results in the context of distributed linear network operators, this paper closes with the application of our framework to two particular distributed problems: finite-time consensus and analog network coding.

关键词： Graph signal processing graph filter (GF) design distributed linear transformation network operator finite-time consensus analog network coding

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