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检索条件"主题词=Physical-layer Network Coding"

共 260 条记录，以下是121-130 订阅

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Joint LDPC and physical-layer network coding for Two-way Relay Channels with Different Carrier Frequency Offsets

Joint LDPC and Physical-Layer Network Coding for Two-way Rel...

引用

4th International Conference on Wireless Communications and Signal Processing (WCSP)

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

ISBN: (纸本)9781467358293;9781467358309

In practical two-way relay channels, different carrier frequency offsets of physical-layer network coding is a very common situation, which can bring serious performance loss of wireless communication systems. Most of the existing joint channel code and PNC schemes are carried out under the assumption of perfect synchronization. This paper we propose a new joint scheme of Low-Density Parity-Check (LDPC)-coded and physical-layer network coding, and different carrier frequency offsets is considered. Simulation results highlight that the proposed joint design of LDPC and physical-layer network coding scheme outperforms traditional method for in practical two-way relay channels when different carrier frequency offsets is considered.

关键词： Two-way Relay Channels Different Carrier Frequency Offsets physical-layer network coding LDPC

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OFDM-CPM Signals in Two-Way Relay Channels with physical-layer network coding 4

OFDM-CPM Signals in Two-Way Relay Channels with Physical-Lay...

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

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

ISBN: (纸本)9781479948086

physical-layer network coding (PNC) has obtained much attention due to its ability to improve throughput in relay-aided communications. In this paper, we introduce orthogonal frequency division multiplexing-continuous phase modulation (OFDM-CPM) signals into a two-way relay (TWR) channel adopting the PNC protocol to form a new scheme. With PNC, the TWR communication is performed during two phases. In the multiple access (MAC) phase, the two users send OFDM-CPM signals concurrently to the relay, and the relay broadcasts the XORed version of the two users' data in the broadcast phase. We focus on the MAC phase and present a decoding scheme for the relay receiver. The error performance of the new scheme is provided by simulation results, and it is shown that the proposed scheme outperforms that of OFDM-PSK for PNC over frequency-selective fading channels.

关键词： physical-layer network coding orthogonal frequency division multiplexing continuous phase modulation two-way relay

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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...

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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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Adaptive Transmission Strategy for Two-way Relaying Using physical-layer network coding

Adaptive Transmission Strategy for Two-way Relaying Using Ph...

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7th International Conference on Wireless Communications, networking and Mobile Computing (WiCOM)

作者： Du, Haiming Liang, Wanyong Cui, Guangzhao Zhengzhou Univ Light Ind Coll Elect & Informat Engn Zhengzhou Peoples R China

ISBN: (纸本)9781424462520

Two-way relaying is an efficient way to improve the network capacity significantly. Making use of the broadcast nature of the wireless network, physical-layer network coding (PLNC) has been evidently shown to improve the spectral efficiency further. However it has a poor performance at low SNR. In this paper, the three-node cooperative transmission is considered, where PLNC is used at the relay node. An adaptive transmission strategy is proposed to solve the issue. The transmission strategy, which is based on instantaneous channel quality, is selected to offer maximum total system capacity. The efficiency of the proposed solution is demonstrated by both analytical performance and simulations.

关键词： two-way relaying physical-layer network coding cooperative communication resouce alloaction

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A Linear physical-layer network coding Based Multiple Access Approach

A Linear Physical-Layer Network Coding Based Multiple Access...

引用

IEEE International Symposium on Information Theory (ISIT)

作者： Chen, Qiuzhuo Yu, Fangtao Yang, Tao Zhu, Jingge Liu, Rongke Beihang Univ Sch Elect Informat Engn Beijing 100191 Peoples R China Univ Melbourne Dept Elect & Elect Engn Parkville Vic Australia

ISBN: (纸本)9781665421607;9781665421591

This paper studies a linear physical-layer network coding multiple access (LPNC-MA) scheme that is capable of achieving any rate-tuples in the MAC capacity region without receiver-iterations or time-sharing. We propose to utilize q-ary irregular repeat accumulate (IRA) codes over finite integer fields/rings and q-PAM as the underlying coded-modulation. The receiver sequentially computes M network coded (NC) message sequences, where the previously computed message sequence is used as side information in computing subsequent ones. All users' messages are then recovered by solving the computed M NC messages via the inverse of the NC coefficient matrix. A joint nested code construction and EXIT chart based code optimization method is developed, yielding near-capacity performance (within 1.1 dB the capacity limit for three users). For fading MAC, we propose a pragmatic method for identifying the network coding coefficient matrix that maximizes the mutual information. Numerical results demonstrate that the frame error rate (FER) of LPNC-MA is within a fraction of dB the outage probability of fading MAC capacity. For a relatively large number of users, it is shown that LPNC-MA remarkably outperforms NOMA-SIC and IDMA in the high spectral efficiency regime, while avoiding the big-loop receiver iteration.

关键词： NOMA physical-layer network coding compute-forward multiple access successive interference cancellation

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Performance Analysis of Asymmetric Two-Way Relay Channels with physical-layer network coding 6th

Performance Analysis of Asymmetric Two-Way Relay Channels wi...

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

作者： Li, Bo Shi, Zejia 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

Up to now, most of the researches about physical-layer network coding (PNC) are based on symmetric two-way relay channels. In this paper, we mainly study PNC in asymmetric two-way relay channels with Rayleigh fading channels and classify the systems into five asymmetric cases. So as to describe the asymmetric cases, we will introduce the asymmetric factors. We simulate the BER performance of PNC for symmetric and asymmetric cases with asymmetric factors fixed. After that we analyze the BER performance of PNC with one of the asymmetric factors is variable when two channels are relatively unreliable. Finally, we give the conditions that one kind of asymmetric scenario transforming to other kind. Also, in the matter of anti-noise performance, uplink asymmetry is the worst case and the phase asymmetry-downlink is the best case.

关键词： physical-layer network coding Asymmetric channels Bit error rate Rayleigh fading

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An Optimal Power Allocation for Two-Way Relay Channel using physical-layer network coding 6

An Optimal Power Allocation for Two-Way Relay Channel using ...

引用

6th International Conference on Instrumentation and Measurement, Computer, Communication and Control (IMCCC)

作者： Chen, Xifeng Wang, Hailong Yang, Wenchao Wang, Gang Yan, Zetao Harbin Inst Technol Commun Res Ctr Harbin 150006 Peoples R China Shenzhen Acad Aerosp Technol Shenzhen Peoples R China

ISBN: (纸本)9781509011957

physical-layer network coding (PNC) is the expanding of network coding (NC) in wireless communication. It has enhanced throughput, spectrum efficiency and robustness of wireless communication system to a large extent. This paper considers four kinds of asymmetric two-way relay channel model based on physical-layer network coding, and analyzes their corresponding outage probability performance respectively, showing the downlink channel has more influence on the communication performance compared with the uplink channel. Furthermore, based on two different principles of minimizing outage probability and maximizing sum-rate, we derive power allocation strategies and their closed-form expressions, respectively. Simulation results show that these schemes are superior to uniform power allocation. When targeting the outage probability, the allocation strategy is a segmented function, which is judged by channel fading, the simulation results coincide with the theoretical ones. Meanwhile, compared with hypothesis testing strategy, our allocation strategy has obvious advantages to adapt to the change of channel conditions. In terms of the sum-rate, in comparison with uniform power allocation, about 2 similar to 3 dB power gain can be obtained.

关键词： physical-layer network coding two-way relay channel power allocation outage probability sum-rate

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Noncoherent LDPC-Coded physical-layer network coding Using Multitone FSK

Noncoherent LDPC-Coded Physical-Layer Network Coding Using M...

引用

IEEE International Conference on Communications / Workshop on Small Cell and 5G networks (SmallNets) / Workshop on 5G and Beyond - Enabling Technologies and Applications

作者： Ferrett, Terry Valenti, Matthew C. West Virginia Univ Lane Dept Comp Sci & Elect Engn Morgantown WV 26506 USA

A noncoherent two-way relaying system is developed using physical-layer network coding for improved throughput over conventional relaying in a fading channel. Energy-efficient noncoherent operation is achieved using multitone frequency shift keying (FSK). A novel soft-output demodulator is developed for the relay, and corresponding achievable exchange rates are found for Rayleigh fading and AWGN channels. Bit-error rate performance approaching the achievable rate is realized using a capacity-approaching channel code and a receiver architecture, which iterates between demodulation and channel decoding. Iterative decoding is performed feeding information back from the channel decoder to the demodulator. In addition, the error-rate performance is made to approach the achievable rate more closely by optimizing LDPC codes for this system. The energy efficiency improvement obtained by increasing the modulation order is more dramatic for the proposed physical-layer network coding scheme than it is for a conventional point-to-point system. Using optimized LDPC codes, the bit-error rate performance is improved by as much as 1.1 dB over a widely known standardized LDPC code, and comes to within 0.7 dB of the limit corresponding to the achievable rate. Throughout this paper, the performance for physical-layer network coding is compared with conventional network coding. When noncoherent FSK is used, physical-layer network coding enables higher achievable rates, and conventional network coding exhibits better energy efficiency at low rates.

关键词： Noncoherent detection physical-layer network coding frequency-shift keying

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Linear physical-layer network coding for 5G Radio Access networks 1

Linear Physical-Layer Network Coding for 5G Radio Access Net...

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1st International Conference on 5G for Ubiquitous Connectivity (5GU)

作者： Burr, Alister Fang, Dong Univ York Dept Elect York YO10 5DD N Yorkshire England

ISBN: (纸本)9781631900556

We consider the application of linear physical layer network coding to next generation radio access networks ( LPNC-RAN). We introduce a linear physical layer network coding scheme based on binary matrices, and illustrate its application to a simple example network topology. We compare this to benchmark schemes based on coordinated multipoint ( CoMP), and show that while its performance is poorer than ideal CoMP with unlimited backhaul, it is significantly better than a practical CoMP scheme, while also giving rise to much lower backhaul load.

关键词： physical-layer network coding PNC COMP network MIMO linear physical-layer network coding

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Optimal Energy-Efficient Relay Selection and Power Allocation for Cognitive Two-Way Relay network Using physical-layer network coding

Optimal Energy-Efficient Relay Selection and Power Allocatio...

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IEEE 78th Vehicular Technology Conference (VTC Fall)

作者： Liu, Jia Kang, GuiXia Zhu, Ying Zhao, YingJiao Mao, JunLing Beijing Univ Posts & Telecommun Key Lab Univ Wireless Commun Minist Educ Beijing 100876 Peoples R China

ISBN: (纸本)9781467361873

This paper addresses relay selection(RS) and power allocation(PA) issues for a physical-layer network coding (PNC) relay based secondary user (SU) communication in cognitive radio networks, in which two secondary transceiver nodes exchange their information with the assistance of a relay under interference power threshold (IPT) constraints. We propose an optimal energy-efficient RS and PA (OE-RS-PA) scheme to minimize total energy consumption per bit with the sum rate constraint and IPT constraints. A closed-form solution for optimal allocation of transmit power among the SU nodes and relay node are then derived analytically and confirmed by numerical results. Furthermore, numerical simulations and comparisons are presented to illustrate the performance of the proposed scheme.

关键词： physical-layer network coding energy-efficient power allocation cognitive radio

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