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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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Expectation Propagation Detection With physical network coding for Massive MIMO Systems

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IEEE SIGNAL PROCESSING LETTERS 2024年 31卷 41-45页

作者： Zeng, Hanxin Xie, Zhaopeng Chen, Pingping Fang, Yi Fuzhou Univ Dept Elect Informat Fuzhou 350108 Fujian Peoples R China Singapore Univ Technol & Design Singapore 487372 Singapore Guangdong Univ Technol Sch Informat Engn Guangzhou 510006 Guangdong Peoples R China

Both massive multiple-input and multiple-output (MIMO) and physical-layer network coding (PNC) techniques can effectively improve the network throughput. However, for PNC-aided massive MIMO systems, the high-order modulations superimposed at the relay particularly bring computational burden and performance degradation to the signal detection. Thus, this letter proposes an iterative MIMO-PNC detector from double expectation propagation (DEP) as a high-accuracy solution in this large-scale system. By exploiting the PNC characteristic, the summation and difference (SD) information of the user pair messages are first linearly formed and iteratively updated between the DEP detector and the channel decoder. Simulation results show that the proposed iterative method can achieve significant performance gains of 2 dB in various massive MIMO systems, as compared to the non-iterative one and traditional linear minimum mean square error (LMMSE) detector.

关键词： Iterative decoding massive MIMO physical-layer network coding

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Outage Probability Analysis of Asymmetrical Bi-directional Multi-Relay System Based on network coding

Outage Probability Analysis of Asymmetrical Bi-directional M...

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14th IEEE International Conference on Communication Technology (ICCT)

作者： Liang, Wenwen Ma, Wenfeng Tian, Hua Xu, Youyun Xu, Kui PLA Univ Sci & Technol Inst Commun Engn Nanjing 210007 Jiangsu Peoples R China

ISBN: (纸本)9781467321013;9781467321006

In this paper, we construct a practical asymmetrical bi-directional multi-relay system model with considering the effect of distance between source nodes and destination nodes. Then two outage probability expressions of the system based on network coding and physical-layer network coding with decode-and-forward are given. Theory analysis is proved correct by Monte Carlo simulations. Also we analyze the system average outage probability with different situations of power allocation coefficient, locations of the relay nodes, SNR and the number of relay nodes, indicating the inherent relationship between power allocation coefficient and total system power as well as the number of relay nodes. Simulation results indicate that the optimal power allocation coefficient of the system based on network coding and physical-layer network coding varies with respect to the distance between source nodes and destination nodes, and the outage probability of physical-layer network coding outperforms network coding scheme. Meanwhile, simulation results show that the system outage probability performance improves with the number of relay nodes increasing.

关键词： Asymmetrical Bi-directional Multi-relay System Outage Probability network coding physical-layer network coding Power Allocation Coefficient

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Toward a network coding Constellation for Two-Way Relay Node Channels

Toward a Network Coding Constellation for Two-Way Relay Node...

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54th Annual IEEE Global Telecommunications Conference (GLOBECOM)

作者： Ndih, Eugene David Ngangue Cherkaoui, Soumaya Univ Sherbrooke Dept Elect & Comp Engn Quebec City PQ Canada

ISBN: (纸本)9781424492688

In physical-layer network coding (PNC), the symbol detected at the relay node in two-way relay channels (TWRC) is the superposition of the symbols transmitted by the sinks. We refer to these symbols as pnc-symbols. In traditional modulation constellations such as Quadrature Amplitude Modulation (QAM) and Phase Shift Keying (PSK), the demodulator may fail to optimally identify pnc-symbols formed from pairs of central symmetrical symbols (CSS) because their superposition may yield to the same output point (i.e., to the same decision region) due to the presence of a central symmetry point. In order to avoid such ambiguity, we propose a non Central Symmetry Constellation (CSC), called 4-TRAQAM, which is used by the sinks such that the decision regions of the output points are pair-wise disjoint. We show that the sinks in the PNC-based TWRC can be considered as a single transmitter using the same modulation with a higher order (10-TRAQAM). We further derive the average energy of pnc-symbols and the error probability of the derived PNC-based TWRC modulation, and we show that the 4-TRAQAM provides the best trade-off between the average energy and the disjointness of the decision regions, compared to other used QAM.

关键词： CSC CSS Constellation diagram Interference Lattices PNC PSK Peer to peer computing QAM Relays TWRC Vectors central symmetrical symbol central symmetry constellation demodulation demodulator error probability network coding network coding constellation phase shift keying phase shift keying physical-layer network coding probability quadrature amplitude modulation quadrature amplitude modulation radio transmitters relays two-way relay node channel wireless channels

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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...

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World Congress on Information and Communication Technologies (WICT)

作者： Cheng, Ping Hao, Jianjun Guo, Yijun Beijing Univ Posts & Telecommun Beijing Key Lab Network Syst Architecture & Conve Beijing 100088 Peoples R China

ISBN: (纸本)9781467348041

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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Downlink network-coded multiple access with diverse power

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Digital Communications and networks 2024年第4期10卷 956-964页

作者： Bohao Cao Zheng Xiang Peng Ren Qiao Li Baoyi Xu School of Telecommunications Engineering Xidian UniversityXi'anShaanxi710071China

Normally,in the downlink network-Coded Multiple Access(NCMA)system,the same power is allocated to different ***,equal power allocation is unsuitable for some scenarios,such as when user devices have different Quality of Service(QoS)***,we study the power allocation in the downlink NCMA system in this paper,and propose a downlink network-Coded Multiple Access with Diverse Power(NCMA-DP),wherein different amounts of power are allocated to different *** terms of the Bit Error Rate(BER)of the multi-user decoder,and the number of packets required to correctly decode the message,the performance of the user with more allocated power is greatly improved compared to the Conventional NCMA(NCMA-C).Meanwhile,the performance of the user with less allocated power is still much better than ***,the overall throughput of NCMA-DP is greatly improved compared to that of *** simulation results demonstrate the remarkable performance of the proposed NCMA-DP.

关键词： network-coded multiple access physical-layer network coding Multi-user decoder Power allocation Throughput Downlink network

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Efficient message exchange protocols exploiting state-of-the-art PHY layer

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EURASIP JOURNAL ON WIRELESS COMMUNICATIONS AND networkING 2017年第1期2017卷 NIL0001-NIL0014页

作者： Lemos, Joao S. Monteiro, Francisco A. Sousa, Ivo Ferreira, Filipe E. Inst Telecomunicacoes Lisbon Portugal Univ Lisbon Inst Super Tecn Lisbon Portugal ISCTE Inst Univ Lisboa Lisbon Portugal

The paper focuses on the two-way relay channel (TWRC) and the multi-way wireless network with three terminals, where all three want to exchange or share data and have to do that with the help of a relay. This paper shows how it is possible to significantly decrease the number of time slots required to exchange messages between terminals in networks based on time-division multiple access (TDMA), by taking into consideration new techniques at the physical (PHY) layer. The paper considers a PHY layer where physical-layer network coding (PLNC), multiple-input multiple-output (MIMO), and in-band "full-duplex" (IBFD) with loopback interference cancellation are all integrated, so that it is possible to significantly increase the overall throughput of the network. This is entirely attained by transferring the burden from the time domain to the spatial domain, via spatial multiplexing and by simultaneously resorting to non-orthogonal multiple access, which is the consequence of using both PLCN and IBFD. For the TWRC, it is shown that, if a massive MIMO relay is used, a simple lattice-based PLNC can be directly applied and, with typical IBFD interference cancellation amounts, a TWRC can effectively use only one time slot instead of the four needed when adopting the traditional TDMA exchange. In the case of the Y-network (i.e., with three terminals), a technique is presented that allows all the information exchange between terminals to be cut from the six time slots required in TDMA to only one time slot, provided that the information packets are not too short. The error performance of these systems is measured by means of simulation using MIMO Rayleigh fading channels.

关键词： Y-network Two-way relay channel MIMO Massive MIMO Full-duplex physical-layer network coding Packets exchange Interference suppression

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Effective capacity of two way relay channels under retransmission schemes

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AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS 2020年 124卷 153321-153321页

作者： Bouteggui, Mokhtar Merazka, Fatiha Kurt, Gunes Karabulut USTHB Univ Elect & Comp Engn Fac Dept Telecommun LISIC Lab Algiers 16111 Algeria Istanbul Tech Univ Dept Elect & Commun Engn TR-34469 Istanbul Turkey

The important role provided by relays in communication networks is indisputable as they improve the transmission robustness by the retransmission schemes. In this paper, the effective capacity of two-way relay channels (TWRCs) in presence of retransmission schemes is investigated. We derive the effective capacity for the two phase scheme referred to as complex field network coding (CFNC). Based on the obtained results, we propose a hybrid scheme combining the traditional scheme (TS) and the CFNC, denoted by JTCNC. Automatic repeat request (ARQ) is used as the retransmission scheme, while the recent framework of the recurrence relation approach is adopted for the effective capacity. The asymmetric scenario, in which users may have different average signal to noise ratios (SNR) at the relay in the uplink and the downlink, is considered. Results obtained in this paper show that CFNC achieves the maximum value of 92 b/Hz/s at high SNR. However, it suffers from performance degradation when the uplink channel has low SNR. This problem is addressed in our proposed JTCNC scheme. The effective capacity for each user has also been derived and the impact of each source by the other sources is also investigated. (C) 2020 Elsevier GmbH. All rights reserved.

关键词： Automatic repeat request Effective capacity Effective bandwidth network coding physical-layer network coding Recurrence relation approach Retransmissions

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Reduced-Dimension Cooperative Precoding for MIMO Two-Way Relay Channels

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IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS 2012年第11期11卷 4150-4160页

作者： Yang, Tao Yuan, Xiaojun Collings, Iain B. CSIRO ICT Ctr Marsfield NSW Australia Chinese Univ Hong Kong Dept Informat Engn Inst Network Coding Hong Kong Hong Kong Peoples R China

We investigate efficient communications over MIMO two-way relay channels (TWRCs) of n(T) < n(R), where n(T) denotes the number of antennas at each user and n(R) denotes that at the relay. We propose a new reduced-dimension (RD) cooperative precoding scheme. In the proposed scheme, the two users cooperatively create n(T) aligned eigen-modes, supporting n(T) streams of physical-layer network coding. We investigate the design of the RD cooperative precoder and derive an asymptotically optimal solution. We analytically show that, in the worst case, the proposed scheme is within 1/2 bit per transmit antenna of the asymptotic sum-capacity of the MIMO TWRC. For fading MIMO TWRCs with i.i.d. Gaussian coefficients, we derive a closed-form expression of the average sum-rate of the proposed scheme using large system analysis. Our analytical result shows that, for a large system with n(T)/n(R) = 1/2, the proposed scheme is less than 0.16 bit per transmit antenna away from the capacity. Furthermore, this gap reduces as n(T)/n(R) increases, and vanishes as n(T)/n(R) tends to 1. It is demonstrated that the proposed scheme can significantly outperform other existing schemes in the literature.

关键词： MIMO two-way relay channel physical-layer network coding precoding capacity

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Cooperative mechanism for PNC two-hop slotted ALOHA network

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AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS 2016年第5期70卷 662-667页

作者： Lin, Shijun Li, Kewei Xie, Jianmin Shi, Jianghong Wang, Xijun Xiamen Univ Dept Commun Engn Xiamen Fujian Peoples R China Xidian Univ Inst Informat Sci State Key Lab Integrated Serv Networks Xian Peoples R China

In this paper, we propose a buffer-information-aided (BIA) request to send (RTS)/clear to send (CTS) mechanism to improve the throughput performance of physical-layer network coding (PNC) in a slotted ALOHA two-hop relay network. In the proposed BIA mechanism, the relay node collects the information of the destination address of the first several packets at the sending buffers of the client nodes, and determines the transmission client nodes at the next time slot. Therefore, the collision probability can be decreased and the proportion of PNC transmissions among the total transmissions is improved. Simulation results show that compared with the traditional RTS/CTS mechanism, the proposed cooperative mechanism can greatly improve the PNC network throughput. (C) 2016 Elsevier GmbH. All rights reserved.

关键词： physical-layer network coding Slotted-ALOHA Cooperative MAC protocol network throughput

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