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

共 170 条记录，以下是51-60 订阅

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Optimal and Near Optimal Power Allocation Schemes in Two-way Relay Systems with physical layer network coding 81

Optimal and Near Optimal Power Allocation Schemes in Two-way...

引用

81st IEEE Vehicular Technology Conference (VTC Spring)

作者： Yang, Yehua Chen, Chen Bai, Lin Jin, Ye Choi, Jinho Peking Univ State Key Lab Adv Opt Commun Syst & Networks Beijing 100871 Peoples R China Beihang Univ Sch Elect & Informat Engn Beijing 100191 Peoples R China Gwangju Inst Sci & Technol GIST Sch Informat & Commun Gwangju South Korea

ISBN: (纸本)9781479980888

In this paper, we investigate the power allocation (PA) schemes in a two-way relay system, where the relay adopts physical layer network coding (PNC) based on decode-and-forward (DF) protocol. The objective is to determine the optimal power allocation (OPA) scheme at both the source nodes and at the relay that minimizes the end-to-end symbol error probability (SEP) performance under a total power constraint. The perfect channel state information (CSI) is assumed to be available at both the source nodes and at the relay. Since numerical methods (e.g., exhaustive search) are required to find the solution of the OPA scheme, which might be infeasible for practical systems, based on upper and lower bounds on the optimal solution, we propose a near optimal power allocation (NOPA) scheme. The asymptotic SEP expression of the proposed NOPA scheme is also derived. By both the analytical and simulated results, it is shown that the proposed NOPA scheme provides the asymptotic SNR gains of about 1.76dB and 2.22dB over two well-known schemes in high SNR. Furthermore, simulation results show that the performance of proposed NOPA scheme is quite close to that of the OPA scheme.

关键词： Two-way relay system physical layer network coding power allocation symbol error probability

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Using physical layer network coding to Improve NOMA System Throughput with Energy Harvesting Users

Using Physical Layer Network Coding to Improve NOMA System T...

引用

IEEE Global Communications Conference (IEEE GLOBECOM)

作者： Khosroazad, Somayeh Naderi, Sonia Abedi, Ali Univ Maine Elect & Comp Engn Dept Wireless Sensor Networks WiSeNet Lab Orono ME 04469 USA

ISBN: (纸本)9781728109626

The aim of this paper is to improve the performance of an energy harvesting (EH) system under millimeter wave (mm wave) massive MIMO (Multiple Input Multiple Output) structure, as beneficial incorporation in beyond 5G. We consider a power splitting structure for this EH system, which has the best trade-off between transferred energy and data rate. However, it is shown that in such systems the use of Successive Interference Cancellation (SIC) method alone, the minimum probability of error requirements for the systems with more users than Radio Frequency (RF) chains may not be attained. Therefore, new schemes with control strategies over intra-beam interference to achieve an acceptable symbol error rate (SER) for multiple users in the same beam is still a vacancy to be studied in particular for the dense 5G networks. The proposed EH system is using a new Superposition Code (SC) based on physical layer network coding (PLNC) concept to dramatically improve the throughput and harvested energy for a specific signal to noise ratio (SNR). As the second goal, two beamforming optimization approaches are also suggested. The simulations result indicates that the uniform beamforming performance is acceptable if avoiding the high complexity is desired.

关键词： massive MIMO non orthogonal multiple access physical layer network coding superposition coding throughput Energy Harvesting system

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On Energy Efficient Routing Using Cooperative physical layer network coding

On Energy Efficient Routing Using Cooperative Physical Layer...

引用

IEEE Global Communications Conference (GLOBECOM)

作者： Akhtar, Auon Muhammad Nakhai, Mohammad Reza Aghvami, A. Hamid Kings Coll London Ctr Telecommun Res Strand London WC2R 2LS England

ISBN: (纸本)9781467309219;9781467309202

In this paper, we focus on energy efficient routing in wireless ad hoc networks. We exploit modulo combining of continuous-time signals arriving at a receiving node from a number of synchronized transmitting nodes and introduce a cooperative physical layer network coding (CPLNC) scheme. To demonstrate the effectiveness of the proposed scheme in saving energy, we incorporate CPLNC in two major energy-efficient routing algorithms. In the resulting modified algorithms, we derive threshold distances that enable the current node to intelligently decide whether it should use CPLNC or point to point transmission for the next hop. Simulation results confirm that the energy saving gains of the proposed new algorithms significantly outperform that of the baseline energy-efficient routing algorithms.

关键词： Cooperative transmission energy efficiency physical layer network coding routing wireless ad hoc networks

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Outage Performance of Full Duplex physical layer network coding Systems in Nakagami-m Channels 24

Outage Performance of Full Duplex Physical Layer Network Cod...

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24th Signal Processing and Communication Application Conference (SIU)

作者： Koc, Asil Altunbas, Ibrahim Yongacoglu, Abbas Istanbul Tech Univ Elekt & Haberleme Muhendisligi Bolumu Istanbul Turkey Univ Ottawa Sch Elect Engn & Comp Sci Ottawa ON Canada

ISBN: (纸本)9781509016792

In this paper, outage performance of full duplex physical layer network coding systems under residual self-interference over Nakagami-m fading channels is investigated. physical layer network coding technique and amplify-and-forward method with variable-gain relaying are used at the relay node of the proposed system. End-to-end signal-to-interference-plus-noise-ratio is derived for the equal power transmission at the source and relay nodes. The outage probability expression is obtained in a single-integral form by using cumulative distribution function approach. The analytical results are verified by Monte-Carlo simulations.

关键词： Full duplex communication physical layer network coding Nakagami-m cooperative communication outage performance

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Link-Oriented Power Allocation in Multicast Systems with physical layer network coding

Link-Oriented Power Allocation in Multicast Systems with Phy...

引用

IEEE Wireless Communications and networking Conference (WCNC)

作者： Zhou, Min Cui, Qimei Wang, Hui Tao, Xiaofeng Tian, Hui Valkama, Mikko Beijing Univ Posts & Telecommun Key Lab Universal Wireless Commun Minist Educ Wireless Technol Innovat Inst Beijing 100876 Peoples R China Tampere Univ Technol Dept Commun Engn Tampere Finland

ISBN: (纸本)9781612842547

Maximizing system sum-rate or minimizing error rate with constrained power are the main research focuses in the previous system-oriented power allocation schemes. However, link-oriented power allocation schemes that minimize power consumption with constrained rates for every link, attracted researchers in recent energy efficiency system design. In this paper, a link-oriented optimal power allocation scheme is firstly proposed for physical layer network coding with DeNoise-and-Forward protocol in multicast system, that two sources and two destinations communicating with the assistance of arbitrary number of relays. We also consider a suboptimal power allocation scheme with low complexity, where a single relay is chosen to minimize the power consumption. The numerical simulation shows that the suboptimal power allocation scheme also can achieve relatively low power consumption, even approach to the optimal scheme in some special case.

关键词： network coding Optimization physical layer Power demand Protocols Relays Resource management energy efficiency system denoise-and-forward protocol link-oriented power allocation scheme multicast system network coding numerical analysis numerical simulation physical layer network coding power consumption protocols system-oriented power allocation scheme

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Multi-User Massive MIMO And physical layer network coding

Multi-User Massive MIMO And Physical Layer Network Coding

引用

IEEE Global Communications Conference (IEEE GLOBECOM)

作者： Okyere, Bismark Musavian, Leila Mumtaz, Rao Univ Essex Dept Comp Sci & Elect Engn Colchester Essex England GS Lda Aveiro Portugal

ISBN: (纸本)9781728109602

In this paper, we investigate the feasibility of applying physical layer network coding (PNC) in Multi-user Massive MIMO systems. In addition, we investigate the performance benefits of the joint Massive MIMO and PNC scheme. PNC has the potential of increasing capacity of a wireless system as the number of timeslots required for end-to-end communication reduces. We adopted a scheme that transforms the channel between a massive-antenna relay and a multitude of multi-antenna user terminals, with a Sum-Difference (SD) matrix. Through Log-Likelihood Ratio (LLR), PNC is achieved by deriving the network coded symbols from the estimates of the SD symbols at the massive-antenna relay node. The equalization matrix for the estimation is based on the SD transformed channel coefficient matrix. The error performance of the proposed joint Massive MIMO and PNC is evaluated through extensive simulation results. It is shown that joint Massive MIMO and PNC performs significantly better than Massive MIMO without PNC for QPSK modulation.

关键词： Massive MIMO physical layer network coding Log-Likelihood Ratio Sum-Difference Matrix Log-Sum Exponent Approximation BER SNR ZF MMSE

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physical layer network coding for Distributed Massive MIMO

Physical Layer Network Coding for Distributed Massive MIMO

引用

WSA 2015;19th International ITG Workshop on Smart Antennas

作者： Alister Burr Dong Fang Dept. of Electronics University of York

We consider distributed "massive MIMO" schemes as a compromise between small cells and massive MIMO for 5G wireless. We consider a scheme we call massive MIMO-CoMP which combines the benefits of distributed massive MIMO and CoMP, and propose the use of physical layer network coding for the backhaul of such a network. We show that this provides a better performance with much smaller backhaul load than would a practical CoMP scheme. The performance is also only fractionally poorer than collocated massive MIMO with joint MMSE detection, but enables the benefits of distributed antennas.

关键词： Massive MIMO Distributed antennas DAS physical layer network coding PNC Cooperative multipoint CoMP Antenna arrays PNC defensive aids suite amsonic acid multiple input multiple output systems editing return stroke physical layer network coding hierarchical network

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MIMO physical layer network coding Based on VBLAST Detection

MIMO Physical Layer Network Coding Based on VBLAST Detection

引用

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

作者： Zhang, Shengli Nie, Canping Lu, Liya Zhang, Shengqi Qian, Gongbin Shenzhen Univ Dept Commun Engn Shenzhen Peoples R China ZTE Corp Shenzhen Peoples R China

ISBN: (纸本)9781467358293;9781467358309

For MIMO two-way relay channel, this paper proposes a novel scheme, VBLAST-PNC, to transform the two superimposed packets received by the relay to their network coding form. Different from traditional schemes, which tries to detect each packet before network coding them, VBLAST-PNC detects the summation of the two packets before network coding. In particular, after firstly detecting the second layer signal in 2-by-2 MIMO system with VBLAST, we only cancel part of the detected signal, rather than canceling all the components, from the first layer. Then we directly map the obtained signal, which is a weighted summation of the first layer and the second layer, to the network coding form. With such partial interference cancellation, the error propagation effect is significantly mitigated and the performance is thus improved as shown in simulations.

关键词： Multiple Input Multiple Output physical layer network coding Two Way Relay Channel VBLAST

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Performance Enhancement for physical layer network coding via Mapping Diversity 23

Performance Enhancement for Physical Layer Network Coding vi...

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23nd Signal Processing and Communications Applications Conference (SIU)

作者： Yilmaz, Mumtaz Adnan Menderes Univ Elekt & Elekt Muhendisligi Bolumu Aydin Turkey

ISBN: (纸本)9781467373869

In this work, for the two-way relay channel employing physical layer network coding, mapping diversity is realized via repetitive transmission at the realy. Under time division transmission scheme, the effect of mapping diversity on overall physical layer network coded system performance is investigated and it is shown to attain lower symbol error rates within lower time slots without a change at data rate.

关键词： physical layer network coding two-way relay channels mapping diversity

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SER Analysis of physical layer network coding at High SNR over AWGN Channels

SER Analysis of Physical Layer Network Coding at High SNR ov...

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4th IET International Conference on Wireless, Mobile and Multimedia networks (ICWMMN)

作者： Li, Dandan Xiong, Ke Zhang, Yu Qiu, Zhengding Beijing Jiaotong Univ Inst Informat Sci Beijing 100044 Peoples R China

ISBN: (纸本)9781849195072

physical layer network coding (PNC), where relay node is allowed to process the superimposed signal directly, can improve the network throughput and spectral efficiency greatly. In this paper, we extent nearest neighbor approximation to investigate the symbol error rate (SER) of PNC over AWGN channels. SER for BPSK and QPSK modulation is derived, and an algorithm is designed to calculate the SER for high order modulations. Simulation results validate the derived SER expressions can characterize the SER performance of PNC over AWGN channels.

关键词： SER physical layer network coding AWGN channel nearest neighbor approximation

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