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Coordinated Direct and Relay Transmission with Interference Cancelation in Wireless Systems

IEEE COMMUNICATIONS LETTERS 2011年第4期15卷 416-418页

作者： Chan Dai Truyen Thai Popovski, Petar Aalborg Univ Dept Elect Syst Aalborg Denmark

Two-way relaying schemes in wireless systems obtain throughput gain by utilizing two features (1) jointly serve two communication flows, thus implementing network coding and (2) use of information that is a priori known to cancel interference and obtain the desired signal. Based on these principles, we propose other schemes that bring throughput gains in wireless cellular systems, where relayed and direct transmissions are carried out in coordinated way. The results show that the coordinated transmission exhibit throughput improvement similar to the two-way relaying schemes.

关键词： Cooperative communications relaying analog network coding interference cancelation

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Inducing Collisions for Fast RFID Tag Identification

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IEEE COMMUNICATIONS LETTERS 2015年第10期19卷 1838-1841页

作者： Carroccia, Gianluca Maselli, Gaia Univ Roma La Sapienza Dept Comp Sci I-00198 Rome Italy

Efficient tag reading is one of the major challenges in RFID systems. So far, most of the literature has assumed that interference is intrinsically harmful and must be avoided. For this reason, prior work aims at singulating tag transmissions in order to prevent collisions. In this letter we adopt the opposite approach: Rather than working against interference, we embrace the collision of radio waves. We propose a new protocol, called TIANC, which uses multiple antennas and analog network coding (ANC) to recover the original tag transmissions. Performance analysis shows that TIANC achieves substantial speed improvement, performing up to 2.3 times faster than previously proposed mechanisms.

关键词： RFID tag identification collision resolution analog network coding

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Improving the Performance of Overlapped Transmission in Wireless Ad Hoc networks

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IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS 2011年第10期29卷 1981-1990页

作者： Boppana, Surendra Shea, John M. Univ Florida Dept Elect & Comp Engn Gainesville FL USA

Multi-packet reception (MPR) has recently received attention for use in military wireless ad hoc networks because of the potential to greatly improve spatial reuse. However, MPR typically requires complicated hardware that makes it prohibitive to implement in many current military platforms. An alternative, cross-layer approach is to use an overlapped transmission technique, in which multiple transmissions can occur in the same geographical area because the communicators can use their knowledge of some of the interfering packets to recover the desired information. Examples of overlapped transmission techniques include overlapped carrier-sense multiple-access (OCSMA), physical-layer network coding, analog network coding, and Katti et al.'s COPE protocol. These techniques have much lower signal processing demands than MPR techniques and have also stimulated a lot of interest for use in military networks. Much of the previous research on overlapped transmission focuses on the physical-layer: how transmissions should be allowed to overlap, how the signals should be designed and detected, and the error probabilities under different conditions. These works tend to make optimistic assumptions about the availability of packets to perform overlapped transmission: often performance is evaluated for a simple three-node network under the assumption that traffic is always available at each of the edge nodes. In this paper, we explain why these protocols may suffer under real-world traffic conditions because of directional traffic flows and congestion control at the transport layer. We focus on how transmission control affects the performance of the OCSMA protocol. We propose modifications to the TCP parameters and the OCSMA protocol to improve the performance. We also show that OCSMA offers better fairness over the IEEE 802.11 MAC protocol in several scenarios.

关键词： overlapped transmission analog network coding cross-layer interaction multi-packet reception

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Performance Evaluation of In-Band Full-Duplex System Using One-Time-Slot Two-Way Relay

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IEEE SYSTEMS JOURNAL 2020年第1期14卷 510-519页

作者： Chang, Kapseok Choi, Yonghoon Elect & Telecommun Res Inst Daejeon 34129 South Korea Univ Sci & Technol Daejeon 34129 South Korea Chonnam Natl Univ Dept Elect Engn Gwangju 61186 South Korea

In-band full-duplex (IFD) two-way relay (TWR) system becomes one among the major concern for maximizing system capacity in wireless network, where one relay node and two source nodes using analog network coding (ANC) are deployed. This paper compares one-time-slot ANC (1TA) TWR, in which each node operates in IFD mode, with two-time-slot ANC (2TA) TWR, where each node is in in-band half-duplex mode. In addition, achievable sum rate of the 1TA-TWR is derived with adverse factors such as direct link interference as well as self-interference (SI), which is induced by IFD signaling. This paper proposes an iterative optimal power allocation (OPA) method to maximize the derived end-to-end sum rate, which is based on Lagrangian and Newton-Raphson algorithm under total power constraint. Numerical results elucidate the efficiency of the 1TA-TWR over the 2TA-TWR as the following: the 1TA-TWR based on the OPA becomes more and more viable than the 2TA-TWR based on existing OPA, as the relay node goes into the center of two source nodes, the link channel gain of mutual source nodes increases, and the SI channel gain approaches noise floor level.

关键词： analog network coding in-band full-duplex optimization power allocation self-interference two-way relay

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Scalable DeNoise-and-Forward in bidirectional relay networks

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COMPUTER networkS 2010年第10期54卷 1607-1614页

作者： Sorensen, Jesper H. Krigslund, Rasmus Popovski, Petar Akino, Toshiaki Koike Larsen, Torben Univ Aalborg Dept Elect Syst Aalborg Denmark Harvard Univ Sch Engn & Appl Sci Cambridge MA 02138 USA

In this paper a scalable relaying scheme is proposed based on an existing concept called DeNoise-and-Forward, DNF. We call it Scalable DNF, S-DNF, and it targets the scenario with multiple communication flows through a single common relay. The idea of the scheme is to combine packets at the relay in order to save transmissions. To ensure decodability at the end-nodes, a priori information about the content of the combined packets must be available. This is gathered during the initial transmissions to the relay. The trade-off between decodability and number of necessary transmissions is analysed and simulations show, that S-ONE is able to provide a better trade-off than traditional schemes at high SNR. (C) 2010 Elsevier B.V. All rights reserved.

关键词： analog network coding Cooperative relaying

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Resource Allocation for Two-Way AF Relaying with Receive Channel Knowledge

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IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS 2012年第6期11卷 2002-2007页

作者： Bagheri, Hossein Ardakani, Masoud Tellambura, Chintha Univ Alberta Dept Elect & Comp Engn Edmonton AB T6G 2M7 Canada

The resource allocation problem for two sources communicating via an amplify-forward relay is studied from an outage perspective. analog network coding is considered for half-duplex nodes with perfect receiver-side channel knowledge. Under a sum power constraint, an optimal power allocation that minimizes an approximate outage probability is derived and shown to improve the performance upto 4.77 dB. A cut-set bound is also optimized to serve as a comparison reference. When such a power allocation is not feasible, two novel resource-optimized schemes, which exploit conventional one-way relaying, are proposed to reduce the outage at low multiplexing gains(1).

关键词： analog network coding convex optimization multiplexing gain resource allocation two-way relay

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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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Time and power scheduling in an ad hoc network with bidirectional relaying and network coding

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WIRELESS COMMUNICATIONS & MOBILE COMPUTING 2015年第3期15卷 459-474页

作者： Mohseni, Maryam Zhao, Dongmei McMaster Univ Dept Elect & Comp Engn Hamilton ON L8S 4K1 Canada

network coding (NC) is a technique that allows intermediate nodes to combine the received packets from multiple links and forwarded to subsequent nodes. Compared with pure relaying, using NC in a wireless network, one can potentially improve the network throughput, but it increases the complexity of resource allocations as the quality of one transmission is often affected by the transmission conditions of multiple links. In this paper, we consider an ad hoc network, where all the links have bidirectional communications, and a relay node forwards traffic between the source and the destination nodes using NC. All transmissions share the same frequency channel, and simultaneous transmissions cause interference to each other. We consider both digital NC and analog NC strategies, referred to as DNC and ANC, respectively, and schedule transmission time and power of the nodes in order to maximize the overall network throughput. For DNC, an optimum scheduling is formulated and solved by assuming that a central controller is available to collect all the link gain information and make the scheduling decisions. Distributed scheduling schemes are proposed for networks using DNC and ANC. Our results indicate that the proposed scheduling scheme for DNC achieves higher throughput than pure relaying, and the scheduling scheme for ANC can achieve higher throughput than both DNC and pure relaying under certain conditions. Copyright (c) 2013 John Wiley & Sons, Ltd.

关键词： digital network coding analog network coding scheduling power distribution

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Scheduling with interference decoding: Complexity and algorithms

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AD HOC networkS 2013年第6期11卷 1732-1745页

作者： Goussevskaia, O. Wattenhofer, R. Univ Fed Minas Gerais Dept Comp Sci BR-31270010 Belo Horizonte MG Brazil Swiss Fed Inst Technol Comp Engn & Networks Lab Zurich Switzerland

In this article we study the problem of scheduling wireless links in the physical interference model with interference decoding capability. We analyze two models with different decoding strategies that explore the fact that interfering signals should not be treated as random noise, but as well-structured signals. The first model makes use of successive interference cancelation, which allows the strongest signal to be iteratively decoded and subtracted from a collision, thus enabling the decoding of weaker simultaneous signals. The second model explores the fact that routers are able to forward the interfered signal of a pair of nodes that wish to exchange a message and these nodes are able to decode the collided messages by subtracting their own contribution from the interfered signal. We prove that the scheduling problem remains NP-complete in both models. Moreover, we propose a polynomial-time scheduling algorithm that uses successive interference cancelation to compute short schedules for network topologies formed by nodes arbitrarily distributed in the Euclidean plane. We prove that the proposed algorithm is correct in the physical interference model and provide simulation results demonstrating the performance of the algorithm in different network topologies. We compare the results to solutions without successive interference cancelation and observe that considerable throughput gains are obtained in certain scenarios. (C) 2013 Elsevier B.V. All rights reserved.

关键词： Wireless networks Scheduling analog network coding Successive interference cancelation Complexity Physical interference model Algorithms

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Relay Selection for Two-Way Relaying With Amplify-and-Forward Protocols

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IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY 2011年第4期60卷 1954-1959页

作者： Song, Lingyang Peking Univ State Key Lab Adv Opt Commun Syst & Networks Sch Elect Engn & Comp Sci Beijing 100871 Peoples R China

In this paper, we propose a relay selection amplify-and-forward (RS-AF) protocol in general bidirectional relay networks with two sources and N relays. In the proposed scheme, the two sources first simultaneously transmit to all the relays, and then, a single relay with a minimum sum symbol error rate (SER) will be selected to broadcast the received signals back to both sources. To facilitate the selection process, we propose a simple suboptimal min-max criterion for relay selection, where a single relay that minimizes the maximum SER of two source nodes will be selected. Simulation results show that the proposed min-max selection has almost the same performance as the optimal selection with lower complexity. We also present a simple asymptotic SER expression and make a comparison with the conventional all-participate AF relaying scheme. The analytical results are verified through simulations. To improve the system performance, optimal power allocation (OPA) between the sources and the relay is determined based on the asymptotic SER. Simulation results indicate that the proposed RS-AF scheme with OPA yields considerable performance improvement over an equal-power-allocation scheme, particularly with a large number of relay nodes.

关键词： Amplify-and-forward (AF) protocol analog network coding relay selection two-way relaying

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