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Improving LDPC-Coded PNC Decoders via Informed Dynamic Scheduling

IEEE COMMUNICATIONS LETTERS 2023年第8期27卷 1949-1953页

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

To decode the transmit message pairs and then obtain the exclusive OR (XOR) message, this letter proposes the double-reliability-based decoding (DRB) algorithms with informed dynamic scheduling (IDS) for low-density parity-check (LDPC) coded physical-layer network coding (PNC) systems. The proposed DRB decoding with informed stability (IS-DRB) utilizes a new stability measure to determine the update order of the check nodes. Moreover, by exploiting the principle of PNC decoding, we present an improved IS-DRB (IIS-DRB) decoding to select the check node with unsatisfied PNC mapped checksum and the large stability to update first. This is due to that message propagated from this check node can quickly correct the variable node that causes unsatisfied checksum. Simulation results show that the proposed algorithms can realize significant performance improvement of about 0.5 dB over the conventional DRB decoding with the limited increase in complexity.

关键词： physical-layer network coding low-density parity-check codes informed dynamic scheduling

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Beyond Integer-Forcing Receiver for Lattice-Code Based Multi-User MIMO System

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IEEE COMMUNICATIONS LETTERS 2023年第10期27卷 2553-2557页

作者： Yang, Tao Beihang Univ Sch Elect & Informat Engn Beijing 100191 Peoples R China

This letter studies a lattice-code based multi-user MIMO system. In the uplink, K single-antenna users encode their messages with the same q -ary linear code mapped to q -PAM, belonging to the ensemble of lattice codes. The NR -antenna receiver attempts to compute K independent streams of integer-combinations (ICBs) of the users' messages. To this end, we put forth a new interference-whitening (IW) based ICB detection method, which reduces the loss of the linear filtering operation in existing integer-forcing (IF). The soft detection outputs are forwarded to K channel-code decoders to recover the messages. For practical configurations with moderate-to-large K , the proposed ICB detection exhibits an enlarged achievable mutual information and considerably improved FER performance, over existing IF.

关键词： Receivers Lattices MIMO communication Codes Linear codes Iterative decoding Indexes Multiple access multi-user MIMO massive access lattice-codes compute-forward physical-layer network coding iterative decoding soft detection

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Improving the Security and Reliability of Energy-Constrained Two-Way Relay Systems With Nonlinear Energy Harvesting

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IEEE ACCESS 2023年 11卷 136793-136808页

作者： Li, Enyu Wang, Ye Liang, Zanyang Zheng, Meijuan Qingdao Univ Technol Sch Informat & Control Engn Qingdao 266520 Peoples R China

This paper presents a novel three-time slot transmission protocol designed for energy-constrained two-way relay systems. In a departure from traditional energy sources, our approach serves a dual purpose by not only providing power to the system but also significantly enhancing its security. We leverage both physical-layer network coding (PNC) and bit-level Exclusive OR (XOR) technology to amplify system capacity and bolster security. Given the unavailability of exact closed-form solutions, we utilize tight upper bounds for the signal-to-noise ratio (SNR) to derive approximate closed-form results, specifically focusing on outage and intercept performance under Rayleigh channel conditions. We also provide performance bounds for outage and intercept probabilities in the high SNR regime. Our simulation results validate the accuracy of our derived probabilities, demonstrating consistency with Monte Carlo simulations. Furthermore, our investigation reveals that the time allocation factor has minimal impact on the security and reliability of the proposed protocol, particularly under high SNR conditions. In addition, we conduct a comparative analysis between the XOR scheme introduced in this article and non-XOR (NXOR) systems. This analysis underscores the superior security-reliability tradeoff of our approach, particularly in scenarios characterized by poor channel conditions between the energy source user and potential eavesdroppers.

关键词： Relays NOMA Protocols Signal to noise ratio Reliability Cryptography Resource management Two-way relay energy harvesting physical-layer network coding cooperative communications Rayleigh channel

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Performance of physical-layer network coding in Asymmetric Two-Way Relay Channels

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China Communications 2013年第10期10卷 65-73页

作者：李博王钢 Peter H.J.Chong 杨洪娟 Yongliang GUAN 沙学军 Communication Research Center Harbin Institute of Technology Communication Research Center Harbin Institute of Technology School of Electrical and Electronic Engineering Nanyang Technological University

In this paper, we study the performance of physical-layer network coding in asymmetric two-way relay channels using four different cases having different poor channels:phase asymmetry, downlink asymmetry, uplink asymmetry and node asymmetry. The decision and mapping rule for symmetric and asymmetric cases are studied. The performance in terms of bit error rate for each case will be studied and analysed by computer simulation. Analytical and simulation results show that uplink asymmetry is the worst case;intra-phase asymmetry and unreliable uplink channels will more severely affect the performance degradation, which is caused by channel asymmetry.

关键词： physical-layer network coding two-way relay channels asymmetric channels bit error rate

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Spatially Modulated Bidirectional Cognitive Cross network Design With physical-layer coding

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IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY 2018年第7期67卷 6185-6192页

作者： Ustunbas, Seda Aygolu, Unit Basar, Ertugrul Istanbul Tech Univ Elect & Commun Engn Dept TR-34469 Istanbul Turkey

In this paper, a bidirectional cognitive cross network using spatial modulation (SM) along with physical-layer network coding (PLNC) is proposed. In our model, a primary user pair located far from each other, exchanges information in the lack of a direct link so that a relay is required for a reliable communication. A secondary user pair shares their relay with the primary user in return for access to the licensed spectrum. Both users exploit SM while the relay also applies PLNC. It is assumed that each user pair can eavesdrop the signal of the other user pair to use these signals as side information and cancel them from the PLNC mapped signal broadcasted by the relay. Optimum power allocation, in which two scenarios are considered, is proposed for sources and the relay. In Scenario I, the optimization is performed by minimizing the bit error probability (REP) of the primary user due to its priority in the licensed band. Scenario 2, which minimizes REP of both users, provides the optimum results for the whole system. A theoretical REP analysis is performed and the results are supported via computer simulation results, which are in perfect match with theoretical findings.

关键词： Cognitive radio spatial modulation physical-layer network coding

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Noncoherent Two-Way Relaying With Decode and Forward: Two Versus Three Phases

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IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY 2022年第3期71卷 3350-3354页

作者： Wei, Ruey-Yi Chin, Wan-Ying Feng, Tian-Yu Natl Cent Univ Dept Commun Engn Taoyuan Taiwan Good Will Instrument Co Ltd New Taipei Taiwan Chroma ATE Inc Taoyuan Taiwan

Noncoherent two- and three-phase two-way relaying (TWR) techniques are bandwidth efficient and entail no pilot symbol-related rate loss. However, noncoherent two-phase TWR (2P-TWR) has not been compared with three-phase TWR (3P-TWR), and several unanswered questions remain. In this paper, we focus on the noncoherent detection of the relay with the decode-and-forward technique. For the noncoherent maximum-likelihood detector at the relay, we propose a distance measure for the transmitted signals of the two terminal nodes. For 2P-TWR, we propose that the signal constellation of one terminal node is the signal constellation of the other terminal node rotated by an angle. Using the proposed distance measure, we obtain the optimal angles and thus resolve those unanswered questions pertaining to 2P-TWR. Finally, noncoherent 3P-TWR was found to significantly outperform noncoherent 2P-TWR in simulations and distance analyses.

关键词： Relays Binary phase shift keying Constellation diagram MIMO communication Encoding network coding Error probability Differential encoding noncoherent detection MPSK physical-layer network coding two-way relaying

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On the Design of Efficient Lattice-Code based Multiple Access

On the Design of Efficient Lattice-Code based Multiple Acces...

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IEEE Conference on Global Communications (IEEE GLOBECOM) - Intelligent Communications for Shared Prosperity

作者： Yang, Tao Yu, Fangtao Chen, Qiuzhuo Liu, Rongke Beihang Univ Sch Elect & Informat Engn Beijing Peoples R China

ISBN: (纸本)9798350310900

This paper studies a lattice-code based multiple-access (LCMA) system. In the uplink, K users encode their messages with the same 2(m)-ary ring code mapped to 2(m)-PAM, belonging to the ensemble of lattice codes. All users transmit simultaneously. The receiver attempts to compute K independent streams of integer-combinations (ICBs) of the users' messages. For this, 1) we establish and solve a new "bounded independent vectors problem" (BIVP) which identifies a near-optimal set of coefficient vectors w.r.t. the ICBs, outperforming existing LLL and HKZ lattice reduction methods;2) we put forth new LCMA soft detection algorithms, which calculate the a posteriori probability w.r.t. the ICB over the lattice. The per-user complexity is of order less than O(K), suitable for massive access of K being large. The soft detection outputs are forwarded to K ring-code decoders to recover the messages. With our developed techniques, LCMA is shown to support a significantly higher load of users and exhibits an improved frame error rate over state-of-the-art IDMA and SCMA schemes. Such advanced functionality are achieved with just parallel processing and K single-user decoding operations.

关键词： Multiple access MIMO lattice-codes compute-forward physical-layer network coding soft detection

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OFDM-based Synchronous PNC Communications Using Higher Order QAM Modulations

OFDM-based Synchronous PNC Communications Using Higher Order...

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IEEE International Conference on Communications (IEEE ICC)

作者： Doost, Ehsan Atefat Saghezchi, Firooz B. Mumtaz, Shahid Rodriguez, Jonathan Musavian, Leila Univ Aveiro Inst Telecomunicacoes P-3810193 Aveiro Portugal Univ Essex Sch Comp Sci & Elect Engn Colchester CO4 3SQ Essex England

ISBN: (纸本)9781538674628

physical-layer network coding (PNC) has great potential to improve the throughput and latency in wireless networks. However, there are two main challenges in PNC systems that do not exist in the conventional Point-to-Point (P2P) communication systems: 1) time and frequency asynchrony of the paired PNC users;and 2) ambiguity of the PNC mapping at the relay node. To address these challenges, in this paper, we apply precoding for power control and phase synchronization of the paired PNC users, while we use modulo-root M addition for the PNC mapping ambiguity removal in higher-order M-ary Quadrature Amplitude Modulations (M-QAM). We evaluate the performance of the system in the framework of the Orthogonal Frequency Division Multiplexing (OFDM)-PNC systems with cyclic prefix extension under Rayleigh faded Tapped Delay Line (TDL)-C and Rician faded TDL-D channel models, proposed by the Third Generation Partnership Project (3GPP), as well as the Additive White Gaussian Noise (AWGN) channel model. The results reveal that our proposed technique can achieve a significant Signal-to-Noise Ratio (SNR) improvement of 12 dB over its asynchronous OFDM-PNC counterpart (without precoding) for Binary Phase Shift Modulation (BPSK) under a TDL-C faded channel model. Moreover, without channel coding, our proposed PNC technique requires an SNR of around 13dB to deliver a two-way 16-QAM communication at a Bit Error Rate of 10-3 under a Rayleigh faded TDL-C channel.

关键词： physical-layer network coding PNC Mapping Ambiguity Removal Synchronous PNC Precoding QAM

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Collision-Free Scheduling in Multi-Hop Underwater Acoustic networks with Local-Traffic Fairness

Collision-Free Scheduling in Multi-Hop Underwater Acoustic N...

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OCEANS Conference

作者： Qin, Xian Wang, Deqing Dong, Chao Chen, Feng Xiamen Univ Minist Educ Key Lab Underwater Acoust Commun & Marine Informa Xiamen Peoples R China Minist Nat Resources Guangzhou Key Lab Marine Environm Survey Technol & Applicat Guangzhou Peoples R China

ISBN: (纸本)9798350332261

In this paper, we investigate collision-free transmission scheduling in data-collection-oriented underwater acoustic (UWA) networks with and without physical-layer network coding (PNC). This application-oriented network is usually deployed as a linear multi-hop topology to extend the coverage area and has a funneling effect due to the location-dependent unfairness problem. Moreover, different from terrestrial radio networks, the channel characteristics of UWA networks are featured with high propagation delay and distance-frequency-dependent attenuation. To tackle these problems, two collisionfree scheduling schemes are put forth under a linear multihop topology, which also provides local-traffic fairness among all nodes. Specifically, a successive-link-based scheduling is presented to achieve the upper bound when PNC is not available. Furthermore, PNC is introduced into the scheduling design to obtain the theoretical upper bound. Numerical simulation results indicate that successive-link-based scheduling can achieve the optimal utilization of 3/8 when PNC is not available. In contrast, PNC-aided scheduling is capable of reaching the theoretical upper bound of 1/2. Most important, the two scheduling schemes developed for linear topology are also a fundamental component that can be used in more complex network configurations.

关键词： Underwater acoustic networks data collection collision-free scheduling physical-layer network coding

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The Techniques of network coding Applied in the physical-layer of the Wireless Communication Systems: A Survey 28th

The Techniques of Network Coding Applied in the Physical-Lay...

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28th Conference of Spacecraft TT and C Technology in China - Openness, Integration and Intelligent Interconnection

作者： Wang, Xiaoting Mei, Qiang Yao, Xu Beijing Inst Tracking & Telecommun Technol Beijing 100094 Peoples R China

ISBN: (纸本)9789811048371;9789811048364

Based on the study of the principles and the development of the network coding, the survey analyzes its applicable techniques in the physical-layer of the wireless communication systems and focuses on the physical-layer network coding (PNC) and the joint design of the channel coding and the network coding techniques. On one hand, the survey firstly introduces the mechanism of the PNC and then summarizes the current results and the future directions of the following classified hot topics: the coding and decoding design, the synchronization problem, the combination with other transmission techniques, the PNC capacity and the application scenario extensions of the PNC. On the other hand, the survey reviews on the joint design techniques of the channel coding and the network coding in accordance with different starting points which are inducted as basing on the type of the channel coding, modifying the mode of handling the soft information, utilizing of the PNC and considering various system scenarios. © Tsinghua University Press, Beijing and Springer Nature Singapore Pte Ltd. 2018.

关键词： Channel coding Joint design network coding physical-layer network coding

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