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Linear network coding using channel quantization combining with SIC based estimation for multiple antenna systems

AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS 2018年 95卷 107-117页

作者： Huu Minh Nguyen Xuan Nam Tran Van Bien Pham Cong Dinh Nguyen Le Quy Don Tech Univ Hanoi Vietnam Vietnam Peoples Army Broadcast Ctr Hanoi Vietnam

This paper proposes a network coding method with linear mapping and low-complexity estimation for the two-way relay non-reciprocal channel using the M-QAM modulation. The proposed network coding is developed by combining the channel quantization method and linear estimation based on successive interference cancellation. The effect of residual interference due to channel quantization on the signal decision is analyzed in detail in order to understand the system- behavior. Analytical and simulation results show that the proposed network coding method can achieve high SER performance and up-link throughput while requiring low computational complexity. (C) 2018 Elsevier GmbH. All rights reserved.

关键词： Maximum likelihood detection VBLAST Sorted VBLAST Two-way relay non-reciprocal channel network coding physical-layer network coding Channel quantization Successive interference cancellation

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Exploiting Interference for Intelligent Relaying in Integrated Space and Terrestrial networks Based on PNC and SIC

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MOBILE networkS & APPLICATIONS 2019年第6期24卷 1947-1954页

作者： Wang, Hailong Wang, Gang Li, Bo Liu, Gongliang Lu, Weidang Harbin Inst Technol Commun Res Ctr Harbin Peoples R China Harbin Inst Technol Weihai Sch Informat Sci & Engn Weihai Peoples R China Zhejiang Univ Technol Coll Informat Engn Hangzhou Peoples R China

The integrated space and terrestrial networks which incorporate various satellite systems and ground networks could provide a wide variety of services and global seamless network access. The integrated network is composed of multiple heterogeneous nodes and sub-networks which requires intelligent and efficient physical layer transmission techniques to maintain high-speed links between these subsystems. As a traditional technology in satellite communications, relay could still work as an important part in these heterogeneous and complex networks. In this paper, two interference exploitation schemes, i.e., physical-layer network coding (PNC) and successive interference cancellation (SIC) which can efficiently increase data exchange rate for relay systems are studied, and an intelligent relaying scheme combining both the advantages of these two schemes is proposed. Simulation results show the proposed adaptive transmission scheme achieves a smoother sum-rate gain while being more robust to dynamic topologies.

关键词： Integrated space and terrestrial networks physical-layer network coding Successive interference cancellation Intelligent relaying

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Design of CPM-PNC Using the Titled-Phase Model over AWGN Channels

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IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES 2019年第2期E102A卷 476-479页

作者： Sha, Nan Guo, Mingxi Gao, Yuanyuan Chen, Lihua Xu, Kui Army Engn Univ PLA Commun Engn Coll Nanjing 210007 Jiangsu Peoples R China

In this letter, a physical-layer network coding (PNC) scheme based on continuous phase modulation (CPM) signal using the titled-phase model, i.e., TIP-CPM-PNC, is presented, and the combined titled-phase state trellis for the superimposed CPM signal in TIP-CPM-PNC is discussed. Simulation results show that the proposed scheme with low decoding complexity can achieve the same error performance as CPM-PNC using the traditional-phase model.

关键词： physical-layer network coding continuous phase modulation titled-phase decoding complexity

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Power allocation based on SEP minimisation in three-user two-way channel

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IET COMMUNICATIONS 2019年第15期13卷 2327-2335页

作者： Jin, Xianglan Pusan Natl Univ Dept Elect & Comp Engn Busan 46241 South Korea

A three-user two-way channel in which three users exchange their messages through a two-way communication is considered by applying the physical-layer network coding and the superposition coding. The equivalent squared minimum distance (ESMD) is derived as a criterion for power allocation by analysing the average symbol error probability (SEP). Optimal and suboptimal power allocations are proposed based on the ESMD maximisation under total power constraint. Inspired by the result, a proportional power allocation is proposed under per-node power constraint. This scheme improves SEP at high signal-to-noise ratio (SNR) and consumes significantly less power. The average power consumption for each node is mathematically derived as a closed form. Furthermore, a compensation algorithm is introduced, which saves power and simultaneously achieves remarkable SEP improvement over entire SNR range. The numerical simulations over Rayleigh fading channels confirm the superiority of the proposed algorithms.

关键词： fading channels network coding error statistics Rayleigh channels physical-layer network coding superposition coding equivalent squared minimum distance average symbol error probability suboptimal power allocations ESMD maximisation total power constraint proportional power allocation per-node power constraint high signal-to-noise ratio average power consumption remarkable SEP improvement Rayleigh fading channels SEP minimisation

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Implementation of physical-layer network coding

Implementation of Physical-layer Network Coding

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IEEE International Conference on Communications (ICC)

作者： Lu, Lu Wang, Taotao Liew, Soung Chang Zhang, Shengli Chinese Univ Hong Kong Dept Informat Engn Hong Kong Hong Kong Peoples R China

ISBN: (纸本)9781457720536

This paper presents the first implementation of a two-way relay network based on the principle of physical-layer network coding. To date, only a simplified version of physical-layer network coding (PNC), called analog network coding (ANC), has been successfully implemented. The advantage of ANC is that it is simple to implement;the disadvantage, on the other hand, is that the relay amplifies the noise along with the signal before forwarding the signal. PNC systems in which the relay performs XOR or other denoising PNC mappings of the received signal have the potential for significantly better performance. However, their implementation also poses many challenges. For example, the relay must be able to deal with symbol and carrier-phase asynchronies of the simultaneous signals received from the two end nodes, and the relay must perform channel estimation before decoding. We investigate a PNC implementation in the frequency domain, referred to as FPNC, to tackle these challenges. FPNC is based on OFDM. In FPNC, XOR mapping is performed on the OFDM samples in each subcarrier rather than on the samples in the time domain. We implement FPNC on the universal soft radio peripheral (USRP) platform. Our implementation requires only moderate modifications of the packet preamble design of 802.11a/g OFDM PHY. With the help of the cyclic prefix (CP) in OFDM, symbol asynchrony and the multi-path fading effects can be dealt with simultaneously in a similar fashion. Our experimental results show that symbol-synchronous and symbol-asynchronous FPNC have essentially the same BER performance, for both channel-coded and unchannel-coded FPNC.

关键词： physical-layer network coding network coding implementation software radio

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physical-layer network coding Aided Two-Way Relay for Transmitted-Reference UWB networks

Physical-Layer Network Coding Aided Two-Way Relay for Transm...

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54th Annual IEEE Global Telecommunications Conference (GLOBECOM)

作者： Gao, Hui Su, Xin Lv, Tiejun Wang, Taotao Wang, Zicheng BUPT Sch Informat & Commun Engn Beijing 100876 Peoples R China TNList Beijing 100084 Peoples R China

ISBN: (纸本)9781424492688

A physical-layer network coding (PNC) aided two-way relay scheme is proposed for Transmitted-Reference (TR) UWB networks. In particular, a novel noncoherent UWB-PNC detector is investigated for the TR-UWB networks. Inheriting the simplicity of the TR-UWB receiver, the proposed PNC detector is based on the autocorrelation receiver (AcR) with simple structure, which effectively suppresses the multi-user interference and harvests the multipath energy. Equipped with the proposed TR UWB-PNC detector, the relay node first detects the bitwise XORed symbol directly from the overlapped information bearing waveforms transmitted from the source nodes, then broadcasts the estimate of the XORed symbol to achieve efficient two-way relay. Simulation results show that, compared with the non-relay, one-way relay and two-way relay with time division multiple access (TDMA) and network coded broadcasting (NCBC), the proposed PNC aided two-way scheme significantly improves both the energy and spectral efficiencies of the TR-UWB networks.

关键词： Detectors Interference Multiuser detection Peer to peer computing Relays Synchronization TR-UWB receiver Time division multiple access autocorrelation receiver bitwise XORed symbol interference (signal) multi-user interference multipath energy network coded broadcasting network coding noncoherent UWB-PNC detector overlapped information physical-layer network coding radio receivers relay node time division multiple access time division multiple access transmitted-reference UWB networks two-way relay scheme ultra wideband communication

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physical-layer network coding in Wireless Multi Access Relay Channel

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International Conference on Applied Informatics and Communication (ICAIC 2011)

作者： Yu, Hanghong Zhang, Jun Beihang Univ Dept Elect Informat Engn Beijing Peoples R China

ISBN: (纸本)9783642232251

network coding recognized as an efficient solution on improving network throughput is a hot spot in the area of wireless network. However, interference affects quality of communication seriously, which is a harmful factor in wireless fading environment. One protocol named physical-layer network coding not only increase network throughput but also takes advantage of interference between signals. How to separate the mixed signal resulting from the broadcast nature of wireless channel is an area with little discussion. This paper firstly proposes a PNC decoding solution for mixed signal separation in Multi Access Relay Channel(MARC) model. Then we use our estimation result about the channel coefficients to give a discussion on the capacity theorem of MARC model using PNC. In conclusion, the simulation result tells that the proposed method ARD PNC performs well in PNC with higher bandwidth utility and lower error rate. At the same time, the capacity using PNC is also improved comparing to traditional direct transmission.

关键词： physical-layer network coding Wireless Fading Channel Capacity Theorem Multi Access Relay Channel

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physical layer Implementation of network coding in Two-Way Relay networks

Physical Layer Implementation of Network Coding in Two-Way R...

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IEEE International Conference on Communications (ICC)

作者： Yang, Hongjuan Meng, Weixiao Li, Bo Wang, Gang Harbin Inst Technol Commun Res Ctr Harbin 150001 Peoples R China

ISBN: (纸本)9781457720536

network coding, which works in the network layer, is an effective technology to improve the throughput of two-way relay networks. In this paper, we compare the existing network coding schemes: traditional network coding (NC) scheme, physical-layer network coding (PNC) scheme and soft network coding (SNC) scheme, and propose a new physical layer scheme which can be seen as the implementation of network coding in two-way relay networks. Relay nodes combine the received signals from two source nodes before demodulation and channel decoding. The computational complexity and BER performance of the proposed scheme are analyzed compared with the previous schemes. Theoretical analysis show that the proposed scheme can save 50% computational cost of demodulation and channel decoding processes compared with NC scheme, meanwhile increase the power efficiency of the relay nodes in two-way relay networks significantly. Future works with the proposed scheme are also discussed.

关键词： physical layer implementation network coding two-way relay networks physical-layer network coding soft network coding

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Optimal power allocation for two-way relaying over OFDM using physical-layer network coding

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The Journal of China Universities of Posts and Telecommunications 2011年第1期18卷 9-15,35页

作者： LI Fu-nian ZHU Guang-xi WANG De-sheng Department of Electronic and Information Engineering Huazhong University of Science and Technology Wuhan 430074 China Department of Electronic and Information Engineering Wuhan University of Science and Technology Wuhan 430081 China

In this paper, a network scenario of two-way relaying over orthogonal frequency division multiplexing （OFDM） is considered, in which two nodes intend to exchange the information via a relay using physical-layer network coding （PLNC）. Assuming that the full channel knowledge is available, an optimization problem, which maximizes the achievable sum rate under a sum-power constraint, is investigated. It is shown that the optimization problem is non-convex, which is difficult to find the global optimum solution in terms of the computational complexity. In consequence, a low-complexity optimal power allocation scheme is proposed for practice implementation. A link capacity diagram is first employed for power allocation on each subcarrier. Subsequently, an equivalent relaxed optimization problem and Karush-Kuhn-Tucker （KKT） conditions are developed for power allocation among each subcarrier. Simulation results demonstrate that the substantial capacity gains are achieved by implementing the proposed schemes efficiently with a low-complexity computational effort.

关键词： two-way relaying power allocation physical-layer network coding OFDM

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network-Coded Multiple Access on Unmanned Aerial Vehicle

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IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS 2018年第9期36卷 2071-2086页

作者： Pan, Haoyuan Liew, Soung Chang Liang, Jiaxin Shao, Yulin Lu, Lu Chinese Univ Hong Kong Dept Informat Engn Hong Kong Hong Kong Peoples R China Chinese Acad Sci Ctr Space Utilizat Key Lab Space Utilizat Technol & Engn Ctr Space Utilizat Beijing 100094 Peoples R China Univ Chinese Acad Sci Beijing 100049 Peoples R China

This paper presents the first network-coded multiple access (NCMA) downlink system on unmanned aerial vehicle (UAV). The use of UAV as a mobile aerial base station has received much attention in the 5G community in the context of highly mobile and flexible-configurable communication systems. As UAVs are limited by their flight time in the air, achieving high spectral and power efficiency while they are inflight is of great importance. Non-orthogonal multiple access (NOMA) is a promising technique to increase the spectral and power efficiency. Conventional NOMA downlink that makes use of superposition coding in combination with successive interference cancellation (SIC) decoding does not work well in scenarios where the channel conditions of different downlink users are not readily available at the transmitter side. This is the case, for example, in the UAV scenario in which the UAV transmitter moves quickly, causing the channel conditions to vary in a very dynamic manner. This paper investigates a new NOMA downlink architecture, referred to as network-coded multiple access. In the absence of channel information, an NCMA transmitter allocates equal power to the superposed signals of different downlink users. A key challenge is how to achieve high NOMA throughput under such equal power allocation. Toward this end, NCMA makes joint use of physical-layer network coding (PNC) and multiuser decoding (MUD) together with a new superposition coding scheme, referred to as NCMA-based superposition coding. In NCMA-based superposition coding, equal powers are allocated to the signals of different users, but a relative phase offset between the signals is introduced to optimize PNC and MUD decodings. To demonstrate the feasibility and advantage of the NCMA downlink, we implemented our designs on a software-defined radio and UAV. Our experimental results show that NCMA is robust against varying channel conditions. Moreover, the throughput of NCMA can outperform the state-of-the-art

关键词： Non-orthogonal multiple access physical-layer network coding network-coded multiple access unmanned aerial vehicle implementation

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