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

共 260 条记录，以下是111-120 订阅

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Wireless Broadcast with physical-layer network coding

Wireless Broadcast with Physical-Layer Network Coding

引用

IEEE Global Communications Conference (GLOBECOM)

作者： Feng, Shen Liew, Soung C. Chinese Univ Hong Kong Dept Informat Engn Hong Kong Hong Kong Peoples R China

ISBN: (纸本)9781479913534

This work investigates the maximum broadcast throughput and its achievability in multi-hop wireless networks with half-duplex node constraint. We allow the use of physical-layer network coding (PNC). Although the use of PNC for unicast has been extensively studied, there has been little prior work on PNC for broadcast. Our specific results are as follows: 1) For single-source broadcast, the theoretical throughput upper bound is n/(n+1), where n is the "min vertex-cut" size of the network. 2) In general, the throughput upper bound is not always achievable. 3) For grid and many other networks, the throughput upper bound n/(n+1) is achievable. Our work can be considered as an attempt to understand the relationship between max-flow and min-cut in half-duplex broadcast networks with cycles (there has been prior work on networks with cycles, but not half-duplex broadcast networks).

关键词： Wireless broadcast physical-layer network coding

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Virtual Private networks in OFDM-PON Supporting Radio-Over-Fiber Based on physical-layer network coding

Virtual Private Networks in OFDM-PON Supporting Radio-Over-F...

引用

2015 International Conference on Photonics in Switching (PS)

作者： Guan, Xun Bo, Tianwai Chan, Calvin Chun-Kit Chinese Univ Hong Kong Dept Informat Engn Hong Kong Hong Kong Peoples R China

We propose and experimentally demonstrate a VPN scheme based on physical-layer network coding in OFDM-PON that supports heterogeneous services. Two signals are coded together physically and respectively decoded at des... 详细信息

ISBN: (纸本)9781479988211

关键词： fiber-wireless physical-layer network coding virtual private network

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The Design of Protograph LDPC Codes for Channel-Coded physical-layer network coding 27

The Design of Protograph LDPC Codes for Channel-Coded Physic...

引用

27th IEEE Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC)

作者： Chen, Pingping Su, Kaixiong Fang, Yi Kong, Lingjun Fuzhou Univ Sch Phys & Informat Engn Fuzhou 350001 Peoples R China Guangdong Univ Technol Sch Informat Engn Guangzhou 510006 Guangdong Peoples R China Nanjing Univ Posts & Commun Sch Comp Sci & Technol Nanjing 210003 Jiangsu Peoples R China

ISBN: (纸本)9781509032549

For two-way relay channel-coded physical network coding (CPNC) systems with sufficiently low code rate, the separate complete decoding (SCD) scheme outperforms the joint channel-physical network coding (JCNC) scheme. Hence, this paper addresses the design of protograph LDPC codes to approach the SCD-based CPNC capacity. In fact, due to virtual erasures induced by CPNC transmission, the conventional protograph that approaches point to point (P2P) AWGN capacity may not perform well in SCD-based CPNC channel in terms of error rates. We then use the finite-length EXIT chart to calculate iterative decoding threshold of a joint code graph formed by two codes in the SCD. Furthermore, we investigate the serial separate complete decoding (S-SCD) and parallel separate decoding (PSCD). Simulation results show that with the S-SCD, the proposed protograph codes have within 0.9 dB of their capacity limits for rates from 1/3 to 3/5.

关键词： physical-layer network coding separate complete decoding protograph code

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Performance of AdaBoost classifier in recognition of superposed modulations for MIMO TWRC with physical-layer network coding 25

Performance of AdaBoost classifier in recognition of superpo...

引用

25th International Conference on Software, Telecommunications and Computer networks (SoftCOM)

作者： Ben Chikha, Wassim Chaoui, Slim Attia, Rabah Carthage Univ Tunisia Polytech Sch SERCOM Lab La Marsa 2078 Tunisia

ISBN: (纸本)9781538632123

Modulation recognition algorithms have recently received a great deal of attention in academia and industry. In addition to their application in the military field, these algorithms found civilian use in reconfigurable systems, such as cognitive radios. Most previously existing algorithms are focused on recognition of a single modulation. However, a multiple-input multiple-output two-way relaying channel (MIMO TWRC) with physicallayer network coding (PLNC) requires the recognition of the pair of sources modulations from the superposed constellation at the relay. In this paper, we propose an algorithm for recognition of sources modulations for MIMO TWRC with PLNC. The proposed algorithm is divided in two steps. The first step uses the higher order statistics based features in conjunction with genetic algorithm as a features selection method, while the second step employs AdaBoost as a classifier. Simulation results show the ability of the proposed algorithm to provide a good recognition performance at acceptable signal-to-noise values.

关键词： AdaBoost classifier higher order statistics MIMO two-way relaying channel physical-layer network coding recognition of superposed modulations

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Apply Uniquely-decodable Codes to Multiuser physical-layer network coding Based on Amplify-and-Forward Criterion 58

Apply Uniquely-decodable Codes to Multiuser Physical-layer N...

引用

IEEE Global Telecommunications Conference (GLOBECOM)

作者： Li, Ya-Tian Yu, Qi-Yue He, Kai Xiang, Wei Harbin Inst Technol Commun Res Ctr Harbin Peoples R China Xi An Jiao Tong Univ Sch Elect & Informat Engn Xian Peoples R China Univ Southern Queensland Sch Mech & Elect Engn Toowoomba Qld Australia

ISBN: (纸本)9781479959525

The physical-layer network coding (PNC) becomes a popular research topic, and the multiuser PNC network is still an open issue. This paper investigates the uniquely-decodable codes (UDC) by using Iterative construction algorithm, and applies the generated UDC to the multiuser PNC network that based on amplify-and-forward (AF) criterion. Due to the attractive features of UDC, the sum data rate can increase with the number of users log-linearly. Moreover, only two time slots are needed for any user node to obtain the data sequences transmitted by an arbitrary user, no matter of the users' number. It is also illustrated that the theoretical bit error rate (BER) of the proposed scheme, which can compare with the traditional PNC scheme in both simulated and theoretical results.

关键词： physical-layer network coding multiuser network uniquely-decodable codes amplify-and-forward

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Reduced-State Decoding in Two-Way Relay networks With physical-layer network coding

Reduced-State Decoding in Two-Way Relay Networks With Physic...

引用

IEEE Information Theory Workshop (ITW)

作者： To, Duc Choi, Jinho Swansea Univ Sch Engn Swansea SA2 8PP W Glam Wales

ISBN: (纸本)9781424482641

We consider the information exchange between two source nodes with the help of a relay node in a two-way relay network (TWRN). Based on physical-layer network coding (PNC), at the relay node, Viterbi or BCJR algorithms based on a full-state trellis can be used for decoding. Since the relay node only needs to decode XORed message rather than two individual messages in PNC, we show that the decoding can be performed using a reduced-state trellis which results in a lower complexity. It is proved that if the source nodes use identical encoders, based on the reduced-state trellis, the diversity order is kept unchanged, which is then confirmed by simulation results.

关键词： BCJR algorithms Viterbi algorithms Viterbi decoding XORed message network coding physical-layer network coding radio networks reduced-state decoding reduced-state trellis code relay node source nodes trellis codes two-way relay networks

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Optimal Decoding Algorithm for Asynchronous physical-layer network coding

Optimal Decoding Algorithm for Asynchronous Physical-Layer N...

引用

IEEE International Conference on Communications (ICC)

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

ISBN: (纸本)9781612842332

A key issue in physical-layer network coding (PNC) is how to deal with the asynchrony between signals transmitted by multiple transmitters. That is, symbols transmitted by different transmitters could arrive at the receiver with symbol misalignment as well as relative carrier-phase offset. In this paper, 1) we propose and investigate a general framework based on belief propagation (BP) that can effectively deal with symbol and phase asynchronies;2) we show that for BPSK and QPSK modulations, our BP method can significantly reduce the SNR penalty due to asynchrony compared with prior methods;3) we find that symbol misalignment makes the system performance less sensitive and more robust against carrier-phase offset. Observation 3) has the following practical implication. It is relatively easier to control symbol timing than carrier-phase offset. Our results indicate that if we could control the symbol offset in PNC, it would actually be advantageous to deliberately introduce symbol misalignment to desensitize the system to phase offset.

关键词： physical-layer network coding network coding symbol synchronization phase synchronization

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Joint Channel-network Decoding for Asynchronous physical-layer network coding

Joint Channel-Network Decoding for Asynchronous Physical-Lay...

引用

IEEE Information Theory Workshop (ITW)

作者： Wang, Xiaokang Mow, Wai Ho Hong Kong Univ Sci & Technol Dept Elect & Comp Engn Hong Kong Peoples R China

ISBN: (纸本)9781538635995

Symbol asynchrony is an important issue in practical implementation of physical-layer network coding (PNC). In this paper, we investigate the asynchronous convolutionally coded PNC over the two-way relay network (TWRN). Symbols from two users arrive at the relay with symbol misalignment. A joint channel-network decoder (JCND) for the relay is proposed. A salient feature for the proposed JCND is that it incorporates the code structure and the symbol misalignment jointly, and the cyclic structure for the channel code is not required to combat the integer symbol misalignment. Furthermore, we derive the bit error rate (BER) bound at the relay utilizing the error state diagram. Simulation results indicate that the performance of the proposed algorithm matches well with the bound.

关键词： physical-layer network coding two-way relay network convolutional code symbol misalignment error state diagram

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Joint Serially Concatenated Continuous Phase Modulation and physical-layer network coding 4

Joint Serially Concatenated Continuous Phase Modulation and ...

引用

4th IEEE International Conference on Information Science and Technology (ICIST)

作者： Sha, Nan Gao, Yuanyuan Yi, Xiaoxin Li, Wenlong Long, Yanshan PLA Univ Sci & Technol Coll Commun Engn Nanjing Jiangsu Peoples R China

ISBN: (纸本)9781479948086

This paper presents a joint physical-layer network coding (PNC) and serially concatenated continuous phase modulation (SCCPM) scheme in a two-way relay (TWR) channel. This proposed scheme can be viewed as a serial concatenated codes (SCCs) scheme in which the joint CPM and PNC is the inner code and the convolutional code (CC) is the outer code. It aims to improve the spectral efficiency, error performance and power efficiency of the PNC system by utilizing the technical advantage of CPM and SCCs. An iterative decoding algorithm for the relay receiver over AWGN channels is investigated. Emphasis is put on the extrinsic logarithmic likelihood ratios (LLRs) of the XORed codewords generated by the soft input soft output (SISO) inner decoder. Simulation results are also provided to show the error performance of the joint scheme.

关键词： physical-layer network coding continuous phase modulation soft input soft output iterative decoding

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Phase Offset Equalization Based on Half-Blind Pre-Distortion for Asynchronous physical-layer network coding 9

Phase Offset Equalization Based on Half-Blind Pre-Distortion...

引用

2017 9th IEEE International Conference on Communication Software and networks (ICCSN 2017)

作者： Yulun Cheng Longxiang Yang Jiangsu Key Lab of Wireless Communications Nanjing University of Posts and Telecommunications

ISBN: (纸本)9781509038237;9781509038220

Phase offset is inevitable in asynchronous physicallayer network coding（PNC） systems, which restricts the accuracy of PNC decoding. To address this issue, this paper proposes a half-blind equalization based on pre-distortion. In the scheme, the intentional phase distortion is pre-brought into the symbols of one user, and then, it is utilized by the relay to equalize the received signals and modify the updating equations in the decoding process. By formulating a phase gain-loss factor model, the upper bound of proposed equalization is proved. On the basis of that, a threshold is proposed to avoid unnecessary distortion. Simulation results verify the effectiveness of the theoretical analysis, and show that the bit error rate performance can be improved by the proposed algorithm.

关键词： physical-layer network coding asynchronous phase offset belief propagation

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