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Low-Complexity Compute-and-Forward Techniques for Multisource Multirelay networks

IEEE COMMUNICATIONS LETTERS 2016年第5期20卷 926-929页

作者： Molu, Mehdi M. Cumanan, Kanapathippillai Burr, Alister Univ York Dept Elect York YO10 5DD N Yorkshire England

Compute-and-forward (C&F) relaying in a multi-source multirelay network is studied in this letter and two novel algorithms are proposed, addressing choice of integer matrix, taking into account the effect of singularity. The first algorithm assumes that there is no co-operation between the nodes for choosing proper integer vectors in the relay nodes;this method is referred to as "blind C&F" and an algorithm is proposed which guarantees that each relay chooses the best integer vector that contains information from at least m source nodes. In the second algorithm that is described as "partially coordinated C&F," we assume that partial cooperation between the relay nodes and propose to exchange a single variable with which the relays are sorted for transmission. The performance of the proposed algorithm is nearly equivalent with optimal relaying, which requires significant overhead signaling.

关键词： Compute-and-Forward Computation Rate physical layer network coding

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Hierarchical Pairwise Error Probability for Hierarchical Decode and Forward Strategy in PLNC

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IEEE COMMUNICATIONS LETTERS 2016年第1期20卷 49-52页

作者： Sykora, Jan Czech Tech Univ Fac Elect Engn CR-16635 Prague Czech Republic

Pairwise error probability (PEP) is an essential tool allowing to design practical optimized coding schemes. It reveals the connection between the performance and the decoding metric that is directly related to the codeword and/or constellation properties. The application of this principle to the hierarchical PEP used to describe the decoding performance of many-to-one message functions (hierarchical network code maps) in physical layer network coding (PLNC) is addressed in this letter. Unlike for the single-user case, the hierarchical PEP reveals a complicated dependence on the structure of the hierarchical codeword/constellation. The structure is defined in terms of hierarchical distance and hierarchical self-distance spectra. We show that the network coded modulation (NCM) minimizing the hierarchical decoding error probability should have zero self-distance spectrum leading to self-folded NCM design criterion.

关键词： Hierarchical decode and forward pairwise error probability physical layer network coding

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Degrees of Freedom of MIMO Y Channel with Three Semi-Blind Users 25

Degrees of Freedom of MIMO Y Channel with Three Semi-Blind U...

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25th Wireless and Optical Communication Conference (WOCC)

作者： Li, Qingyun Wu, Gang Li, Hongxiang Li, Shaoqian Univ Elect Sci & Technol China Natl Key Lab Sci & Technol Commun Chengdu 611731 Peoples R China Univ Louisville Dept Elect & Comp Engn Louisville KY 40292 USA

ISBN: (纸本)9781467399586

In this paper, we study the degrees of freedom (DOF) for three-user multiple-input and multiple-output (MIMO) Y channel, where each user equipment (UE) sends two independent messages to the other two UEs while receiving two independent messages from them via a common relay node. We assume each UE is equipped with AI antennas and is semi-blind in the sense that no channel state information at the transmitter (CSIT) is available in multiple access (MAC) phase, while the relay is equipped with AT

关键词： Degrees of freedom channel state information physical layer network coding signal space alignment for network coding interference alignment

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Combined physical network coding and Friendly Jamming for Secure Wireless Cooperative Communications 84

Combined Physical Network Coding and Friendly Jamming for Se...

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84th IEEE Vehicular Technology Conference (VTC-Fall)

作者： Li, Dehuai Yan, Shiwei Zhang, Xiguang Shang, Yong Peking Univ Sch Elect Engn & Comp Sci Beijing Peoples R China

ISBN: (纸本)9781509017010

This paper exploits physical layer network coding (PNC) and friendly jamming to improve their physical layer security in wireless two-hop cooperative communications, consisting of one source-destination pair with the help of multiple intermediate nodes in the presence of one eavesdropper. By sending a jamming signal carrying a random binary message from the selected jammer and utilizing the PNC at the selected relay node, the system can avoid the disadvantage of the friendly jamming to the source-relay channel and do good to the relay-destination channel, thereby achieving better secrecy rate. Assuming global channel state information available and memoryless adversaries, we seek to minimize the secrecy outage probability with the optimal relay and jammer selection. Numerical simulation results show that our schemes outperform the conventional approaches in wireless cooperative communications.

关键词： wireless cooperative communications physical layer security physical layer network coding friendly jamming

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Joint physical network coding and Destination Aided Cooperative Jamming for Secure Wireless Sensor networks 83

Joint Physical Network Coding and Destination Aided Cooperat...

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IEEE 83rd Vehicular Technology Conference (VTC Spring)

作者： Li, Dehuai Zhang, Xiguang Shang, Yong Peking Univ Sch Elect Engn & Comp Sci Beijing Peoples R China

ISBN: (纸本)9781509016983

In this paper, we investigate physical layer network coding (PNC) and destination assisted cooperative jamming (DACJ) for physical layer security in wireless sensor networks, in which there is one source, one destination, a cluster of intermediate nodes, and multiple eavesdroppers. Under the PNC protocol, the considered two-hop wireless sensor network implements a complete transmission process in two phases. In the first phase, through sending a jamming signal from the destination and exploiting the PNC at the relay, the relay decodes the exclusive-OR (XOR) performed form of the source and the jamming message. Therefore, the jamming signal can degrade the wire-tap channels without hampering the legitimate channel. In the second phase, the relay transmits the re-encoded message to the destination while eavesdroppers are out of work as they cannot extract information from the signal. Thus, the proposed design can significantly improve the performance of secure wireless communications. Meanwhile, the proposed schemes select one optimal node from the intermediate nodes and give an optimal solution of power allocation to maximize secrecy capacity. Numerical simulation results show that the proposed schemes have a better and more stable secrecy performance than the conventional schemes at the same power consumption.

关键词： wireless sensor networks physical layer security physical layer network coding destination assisted cooperative jamming

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LDA-Lattice Aided network coding for Two-Way Relay

LDA-Lattice Aided Network Coding for Two-Way Relay

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SAI Computing Conference (SAI)

作者： Liu, William Ling, Cong Imperial Coll London Dept Elect & Elect Engn London England

ISBN: (纸本)9781467384605

In this paper a new joint channel coded network coding (JCCNC) scheme is proposed based on low density construction A (LDA) lattices for the two-way relay channel, which we call LDA-lattice aided JCCNC (LDA-JCCNC). In LDA-JCCNC, the channel coding and network coding operations are integrated through the underlying LDA lattice. The arithmetic addition of the channel coded signals from the two source nodes is directly decoded using the LDA lattice decoding algorithm, and mapped to modulo addition codewords. It is shown that the proposed scheme has a lower complexity and yet perform almost on par with one of the best performing JCCNC schemes, the standard modulo sum JCCNC. We also give methodology on how our LDA-JCCNC scheme can be applied to PAM and QAM modulation systems, over Gaussian integers and Eisenstein integers, in contrast with most existing JCCNC schemes, which are restricted to set types of modulation frameworks.

关键词： Channel coded network coding LDA lattice LDPC code physical layer network coding two-way relay

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physical layer network coding for FSK Systems

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IEEE COMMUNICATIONS LETTERS 2009年第8期13卷 597-599页

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

In this work we extend the existing concept of DeNoise and Forward (DNF) for bidirectional relaying to utilise non-coherent modulation schemes. This is done in order to avoid the requirement of phase tracking in coherent detection. As an example BFSK is considered, and through analysis the decision regions for the denoise operation in DNF are identified. The throughput performance of BFSK in DNF is compared to BPSK.

关键词： physical layer network coding frequency shift keying non-coherent modulation

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Joint physical network coding and Destination Aided Cooperative Jamming for Secure Wireless Sensor networks

Joint Physical Network Coding and Destination Aided Cooperat...

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IEEE Vehicular Technology Conference

作者： Dehuai Li Xiguang Zhang Yong Shang School of Electrical Engineering and Computer Science Peking University

ISBN: (纸本)9781509016990

关键词： Wireless sensor networks physical layer security physical layer network coding Destination assisted cooperative jamming Wireless sensor networks destination physical layer intermediate node cooperative jamming exclusive OR CARRIER SYSTEM PNC interfering signal Power consumption physical network

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Cloud Compute-and-Forward With Relay Cooperation

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IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS 2015年第6期14卷 3415-3428页

作者： Pappi, Koralia N. Diamantoulakis, Panagiotis D. Otrok, Hadi Karagiannidis, George K. Aristotle Univ Thessaloniki Dept Elect & Comp Engn Thessaloniki 54124 Greece Khalifa Univ Sci Technol & Res Dept Elect & Comp Engn Abu Dhabi U Arab Emirates

We study a cloud network with M distributed receiving antennas and L users, which transmit their messages towards a centralized decoder (CD), where M >= L. We consider that the cloud network applies the Compute-and-Forward (C&F) protocol, where L antennas/relays are selected to decode integer equations of the transmitted messages. In this work, we focus on the best relay selection and the optimization of the physical-layer network coding (PNC) at the relays, aiming at the throughput maximization of the network. Existing literature optimizes PNC with respect to the maximization of the minimum rate among users. The proposed strategy maximizes the sum rate of the users allowing non-symmetric rates, while the optimal solution is explored with the aid of the Pareto frontier. The problem of relay selection is matched to a coalition formation game, where the relays and the CD cooperate to maximize their profit. Efficient coalition formation algorithms are proposed, which perform joint relay selection and PNC optimization. Simulation results show that a considerable improvement is achieved compared to existing results, both in terms of the network sum rate and the players' profits.

关键词： Cloud radio access networks cloud base stations compute-and-forward physical layer network coding relay selection cooperative game theory

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Single and Dual Relay Selection in Two-Way network-coded Relay networks

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WIRELESS PERSONAL COMMUNICATIONS 2015年第1期83卷 99-115页

作者： Razmi, Nasrin Attari, Mahmoud Ahmadian Soleimani-Nasab, Ehsan Ghasemi, Abdorasoul KN Toosi Univ Technol Fac Elect & Comp Engn Tehran Iran Grad Univ Adv Technol Fac Elect & Comp Engn Kerman Iran

In this paper, the relay selection problem for two-way relaying networks in single and dual relay selection schemes is addressed. In the single relay selection scheme, the problem is to find the best relay node which leads to the minimum bit error rate (BER) between the source nodes. We then derive the upper and lower bounds for the signal to noise ratio and the end-to-end BER of this scheme. In the dual relay selection scheme, the problem is to find the two best relay nodes. In this scheme, Alamouti space-time coding and physical layer network coding are utilized in order to achieve the higher performance. For improving the system performance, optimal power allocation between the sources and the relays is considered based on decreasing the BER. Finally, simulation results are provided to verify the correctness of analytical results.

关键词： Alamouti space-time coding Bit error rate Dual relay selection physical layer network coding Single relay selection

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