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检索条件"主题词=Physical-layer network coding"

共 260 条记录，以下是101-110 订阅

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Outage Performance Study of Cognitive Multi-Antenna Relay network with physical-layer network coding over Nakagami-m Fading Channels

Outage Performance Study of Cognitive Multi-Antenna Relay Ne...

引用

IEEE Military Communications Conference

作者： Zhu, Ying Liu, Jia Tao, XiaoYu Feng, Zhiyong Beijing Univ Posts & Telecommun Minist Educ Key Lab Univ Wireless Commun Beijing 100876 Peoples R China Guilin Univ Elect Technol Dept Teaching & Practicing Guilin 541004 Peoples R China Chongqing Jinmei Commun Co Ltd Chongqing 400030 Peoples R China

ISBN: (纸本)9780769551241

In this paper, we investigate the outage performance of physical-layer network coding (PNC) based cognitive multi-antenna relay network (CMRN) over the Nakagami-m channel. In the spectrum sharing systems, secondary users (SUs) are located on two different primary user (PU) coverage areas. Secondary transceiver nodes exchange their information with the assistance of a multi-antenna relay using PNC protocol. By applying the interference temperature (IT) constraints at the transceiver nodes and relay nodes in secondary systems, we analyze the outage performance in underlay spectrum sharing with the best relay selection criterion. The cumulative distribution function (CDF) of the signal to noise ratio (SNR) for each link are derived to obtain the tight upper bound on the outage probability of the secondary relay system. Simulations results demonstrate the validity and accuracy of the theoretical analysis.

关键词： Cognitive multi-antenna relay network outage probability physical-layer network coding Nakagami-m fading channel

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Performance Analysis of physical-layer network coding for IIoT Applications 9

Performance Analysis of Physical-Layer Network Coding for II...

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9th International Conference on Mechatronics Engineering (ICOM)

作者： Yassin, Alaa A. Saeed, Rashid A. Yousif, Ebtihal H. G. Khalifa, Othman O. Sudan Univ Sci & Technol Dept Elect Engn Khartoum Sudan Inter Islamic Uni Malaysia Dept Elect & Comp Engn Kuala Lumpur Malaysia Libyan Ctr Engn Res & Informat Technol Bani Walid Libya

ISBN: (纸本)9798350349795;9798350349788

physical-layer network coding (PNC) was introduced into wireless communication systems to improve system performance metrics such as error rates. The Industrial Internet of Things (IIoT) utilized the PNC concept to communicate robots together and computer applications with high data rates, low latency, and full diversity. A two-way relay network (TWRN) is a basic implementation of PNC in research. This paper provides a performance analysis of TWRN-PNC for IIOT applications over a Rayleigh fading channel employing high-order modulation. The theoretical framework of the proposed model is derived in closed form for the uplink and downlink phases. Additionally, the maximum likelihood (ML) and Latin square (LS) methods are considered for the mapping of superimposed signals to achieve the denoising-and-forward (DNF) relaying protocol in PNC. Theoretical and simulation results of average symbol error rate probability are demonstrated for both multiple access and end-to-end error, using square-quadrature amplitude modulation (QAM), 4-QAM, and 16-QAM modulation schemes, respectively, and simulated uplink throughput at the relay. The positive results are obtained in both simulation and exact results of high-order modulation using Monte Carlo simulation and reported the effectiveness of the approach across varying modulation levels. Throughput is approximately double that of traditional network links.

关键词： physical-layer network coding IIoT Symbol Error Rate QAM Rayleigh Fading Channel

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Optimal Noncoherent Detection for physical-layer network coding

Optimal Noncoherent Detection for Physical-Layer Network Cod...

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IEEE Global Conference on Communications (GLOBECOM) / Workshop on Wireless networking and Control for UAV

作者： Wang, Zhaorui Liew, Soung Chang Lu, Lu Chinese Univ Hong Kong Dept Informat Engn Shatin Hong Kong Peoples R China Chinese Acad Sci Technol & Engn Ctr Space Utilizat Key Lab Space Utilizat Beijing 100094 Peoples R China Univ Chinese Acad Sci Beijing 100049 Peoples R China Chinese Univ Hong Kong Inst Network Coding Hong Kong Peoples R China

ISBN: (纸本)9781538647271

This paper investigates inoncoherent detection in a two-way relay channel operated with physical-layer network coding (PNC), assuming FSK modulation and short-packet transmissions. For noncoherent detection, the detector has access to the magnitude but not the phase of the received signal. For conventional communication in which a receiver receives the signal from a transmitter only, the phase does not affect the magnitude, hence the performance of the noncoherent detector is independent of the phase. PNC, on the other hand, is a multiuser system in which a receiver receives signals from multiple transmitters simultaneously. The relative phase of the signals from different transmitters affects the received signal magnitude through constructive-destructive interference. In particular, for good performance, the noncoherent detector of a multiuser system such as PNC must take into account the influence of the relative phase on the signal magnitude. Building on this observation, this paper delves into the fundamentals of PNC noncoherent detector design. To avoid excessive overhead, we assume a set-up in which the short packets in the PNC system do not have preambles. We show how the relative phase can be deduced directly from the magnitudes of the received data symbols, and that the knowledge of the relative phase thus deduced can in turn be used to enhance performance of noncoherent detection. We design a noncoherent detector that jointly estimates relative phase and detects data using a belief propagation algorithm. Numerical results show that our detector performs as well as a "fictitious" optimal detector that has perfect knowledge of the relative phase. Although this paper focuses on PNC with FSK modulation, we believe the insight of this paper applies generally to noncoherent detection in other multiuser systems with other modulations. Specifically, our insight is that the relative phase of overlapped signals affects the signal magnitude in multiuser systems, but

关键词： physical-layer network coding noncoherent detection frequency shift keying short packet

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Reconfigurable Intelligent Surface-Enabled physical-layer network coding for Higher Order M-QAM Signals

Reconfigurable Intelligent Surface-Enabled Physical-Layer Ne...

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

作者： Doost, Ehsan Atefat Saghezchi, Firooz B. Fondo-Ferreiro, Pablo Gil-Castineira, Felipe Papaioannou, Maria Vardakas, John Surattanagul, Jinwara Rodriguez, Jonathan Univ Aveiro Inst Telecomunicacoes Aveiro Portugal Univ Vigo Informat Technol Grp AtlanTTic Res Ctr Vigo Spain Univ Greenwich Fac Engn & Sci Chatham Maritime London England Iquadrat Informat SL Barcelona Spain UOWM Dept Informat Koila Greece Univ South Wales Fac Comp Engn & Sci Pontypridd Wales

ISBN: (纸本)9798350310900

physical-layer network coding (PNC) is an effective technique to improve the throughput and latency in wireless networks. However, there are two major challenges for PNC, especially when using higher order modulations: 1) phase synchronization and power control at the paired User Equipments (UEs);and 2) the ambiguity removal of the PNC mapping at the relay node. To address these challenges, in this paper, we apply power control at transmitting UEs and exploit Reconfigurable Intelligent Surfaces (RISs) to synchronize the phase of the transmitted signals and ensure that they arrive at the relay with the same power and phase rotation. Then, we employ modular addition for an unambiguous PNC mapping for M-ary Quadrature Amplitude Modulations (M-QAM). We evaluate the performance of the system in the framework of Orthogonal Frequency Division Multiplexing (OFDM)-PNC for different RIS sizes and modulation orders. Furthermore, we study the sensitivity of PNC systems for Channel Estimation Error (CEE). The results reveal that 1) PNC systems show quite higher sensitivity to CEE compared with RIS-assisted one-way relay channel systems;2) when the CEE is low, RIS can considerably enhance the Signal-to-Noise Ratio (SNR) of the PNC system, e.g., for a Bit Error Rate (BER) of 10(-3) (without channel coding), increasing the RIS size from one to 256 elements in 28 GHz band leads to 200% improvement in SNR.

关键词： Reconfigurable Intelligent Surface physical-layer network coding Quadrature Amplitude Modulation Phase Synchronization Ambiguity Removal Channel Estimation Error

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A Spectrum Sharing Protocol Based on physical-layer network coding 25

A Spectrum Sharing Protocol Based on Physical-Layer Network ...

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25th Signal Processing and Communications Applications Conference (SIU)

作者： Ustunbas, Seda Aygolu, Umit Istanbul Tech Univ Elekt & Haberlesme Muhendisligi Bolumu Istanbul Turkey

ISBN: (纸本)9781509064946

In this paper, a spectrum sharing protocol based on overlay system paradigm is considered. The primary user is composed of a transmitter-receiver pair while a transmitter receiver pair and a relay form the secondary user. The distances between transmitter-receiver pairs are so large;therefore, a relay is required for a reliable communication. All receivers are closer to the transmitter of the other user compared to its own. The secondary user shares its relay with the primary user to improve its performance;in return, it accesses the licensed spectrum. In the first time slot, both transmitters send their information to relay while receiver of the other user eavedrops this signal. Relay decodes the received signals simultaneously and applies bit wise XOR opreation according to physical-layer network coding technique. In the second time slot, R sends physical-layer network coded signal to both receivers which have the information bits of the other user from the first time slot. Both receivers access their intended information bits by applying XOR operation. Bit error probability for the considered protocol is analytically derived and supported via simulation results. Bit error perfomance of the considered protocol is compared with that of direct link between transmitter receiver pairs.

关键词： Cognitive radio physical-layer network coding

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Combined Denoise-and-Forward and Superposition Coded physical-layer network coding in Data Length Asymmetric Two-Way Relay Channels 6th

Combined Denoise-and-Forward and Superposition Coded Physica...

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6th International Conference on Communications, Signal Processing, and Systems (ICCSPS)

作者： Li, Bo Cui, Wenjing Yang, Hongjuan Liu, Gongliang Peng, Xiyuan Harbin Inst Technol Weihai Weihai Peoples R China Sci & Technol Commun Networks Key Lab Shijiazhuang Hebei Peoples R China Harbin Inst Technol Harbin Heilongjiang Peoples R China

ISBN: (纸本)9789811065712;9789811065705

To improve the bit error rate (BER) performance of physical-layer network coding (PNC) in data length asymmetric two-way relay communication systems, a new PNC scheme named combined denoise-and-forward and superposition-based physical-layer network coding (DNF-SC-PNC) is proposed, and the decoding algorithm of the scheme is improved. In the scheme, the mixed information is denoised and superposed in the relay node, which will be broadcasted to destination node. The destination node will use SIC or LLR algorithm decoding. Theoretical analysis and simulation results show that DNF-SC-PNC can provide better BER performance and better throughput rate performance when the data length is asymmetric. Furthermore, we also proved the LLR algorithm can provide better BER performance and better throughput rate performance than SIC algorithm when the data length is asymmetric.

关键词： physical-layer network coding Data length asymmetric SIC algorithm LLR algorithm

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Spatial-Modulated physical-layer network coding in Two-Way Relay networks with Convolutional Codes 9

Spatial-Modulated Physical-Layer Network Coding in Two-Way R...

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9th International Conference on Ubiquitous and Future networks (ICUFN)

作者： Chu, Eunmi Yoo, Jae Sook Jung, Bang Chul Chungnam Natl Univ Daejeon 34134 South Korea

ISBN: (纸本)9781509047499

We consider a spatial modulation (SM)-based physical-layer network coding (PNC) technique with convolutional codes (CC) for a two-way relay network (TWRN) consisting of two source nodes and a single relay node. We assume all communicating nodes are equipped with multiple antennas. Two source nodes simultaneously transmit packets by utilizing the SM with CC to the relay node. The relay node detects signal by utilizing a maximum-likelihood detection technique based on a direct decoding or a separate decoding algorithm. Through extensive simulations, it has been shown that the SM-based PNC technique outperforms the conventional PNC technique. Note that the direct decoding has low complexity, while achieving a similar performance to the separate decoding in terms of bit error rate (BER).

关键词： physical-layer network coding spatial modulation convolutional codes two-way relay networks multiple antennas

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Analysis of physical-layer network coding over Asymmetric Two-way Relay Channel with Carrier Frequency Offset

Analysis of Physical-layer Network Coding over Asymmetric Tw...

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IEEE/CIC International Conference on Communications in China (ICCC)

作者： Zong, Shouxin Gao, Shaoshuai Univ Chinese Acad Sci Sch Elect Elect & Commun Engn Beijing Peoples R China

ISBN: (纸本)9781509002436

The physical-layer network coding (PNC) can greatly improve the throughput of wireless network communications. However, critical synchronization in both time domain and frequency domain is required. Orthogonal frequency division multiplexing (OFDM) solves the problem of the synchronization in time domain while more critical synchronization in frequency domain is required. In this paper, we investigate the inter-channel interference (ICI) issue for OFDM-based physical-layer network coding (FPNC) over the two-way relay channel (TWRC). An approximate formula that calculates the ICI is derived. The compensation frequency, used by intermediate node to obtain minimal ICI power, has also been calculated. We find that average compensation is the optimal compensation method in the symmetric TWRC system while a different compensation method should be adopted in the asymmetric TWRC system. In addition, it is observed that bit error rate (BER) performance is not only decided by the power of the ICI but also by the distribution of it. At last, numerical results indicate that our approximate formula is accurate enough to calculate the ICI and can be applied to other OFDM systems.

关键词： physical-layer network coding two-way relay channel carrier frequency offset inter-channel interference

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Joint Relay Antenna Selection and Zero-Forcing Spatial Multiplexing for MIMO Two-Way Relay with physical-layer network coding

Joint Relay Antenna Selection and Zero-Forcing Spatial Multi...

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54th Annual IEEE Global Telecommunications Conference (GLOBECOM)

作者： Gao, Hui Su, Xin Lv, Tiejun Zhang, Zhang BUPT Beijing 100876 Peoples R China TNList Beijing 100084 Peoples R China

ISBN: (纸本)9781424492688

We consider a multiple-input multiple-output (MIMO) two-way relay network with two N-T-antenna (N-T >= 2) end nodes and one dedicated N-R-antenna (N-R > N-T) relay node. A physical-layer network coding (PNC) based joint relay antenna selection and zero-forcing (ZF) spatial multiplexing scheme is proposed to support N-T streams of bidirectional data exchanging with the help of N-T out of N-R selected antennas at the relay node. The optimum relay antennas are selected by a Max-Min criterion with respect to the post-processing SNR of the whole system and then the linear ZF based MIMO two-way relay transmission is achieved with the help of the selected relay antennas. The optimum relay antenna selection not only fulfills the ZF based scheme's requirement on the number of effective relay antennas but also provides an end-to-end diversity advantage to the N-T streams of bidirectional data exchanging with linear transceiver at each end node. The diversity order of the proposed scheme is analyzed. Explicit diversity order d = N-R - 1 is obtained theoretically for N-T = 2 streams of bidirectional data exchanging. For N-T >= 2 cases, a conjecture that d = N-R - N-T + 1 is obtained based on simulation results.

关键词： Antennas Indexes MIMO MIMO communication MIMO two-way relay Nt-antenna Peer to peer computing Relays Signal to noise ratio Silicon ZF based MIMO two-way relay transmission bidirectional data exchange diversity reception electronic data interchange joint relay antenna selection linear transceiver max-min criterion multiple-input multiple-output two-way relay network network coding optimum relay antenna selection physical-layer network coding post-processing SNR radio transceivers space division multiplexing zero-forcing spatial multiplexing

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physical-layer network coding: A High Performance PHY-layer Decoder

Physical-layer Network Coding: A High Performance PHY-layer ...

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Ad-Hoc and Sensor networks Symposium

作者： Shakeel Salamat Ullah Soung Chang Liew Lu Lu Lizhao You Department of Information Engineering The Chinese University of Hong Kong Institute of Network Coding The Chinese University of Hong Kong

ISBN: (纸本)9781479966653

physical-layer network coding (PNC) can potentially boost the throughput of a two-way relay network by 100% compared with conventional packet forwarding schemes. However, the complexity of PNC channel decoders can be considerably higher than the complexity of channel decoders for point-to-point communication systems. Although many PNC channel decoders proposed to date have good decoding performance, they may not be feasibly implemented in practical systems due to their high computation complexities. This paper presents a reduced-complexity decoder (RCD), a PNC decoder with adjustable decoding complexity that is amenable to real-time implementation. We experimentally evaluate the performance-complexity trade-off of RCD. Our experimental results show that RCD can achieve substantial throughput gain over state-of-the-art decoders proposed for real-time PNC systems.

关键词： physical-layer network coding Two-way relay channel Convolutional codes Reduced-complexity decoder USRP GNU Radio

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