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

共 260 条记录，以下是231-240 订阅

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Wireless MIMO Switching: Sum Rate Optimization

Wireless MIMO Switching: Sum Rate Optimization

引用

IEEE Wireless Communications and networking Conference (WCNC)

作者： Wang, Fanggang Yuan, Xiaojun Liew, Soung Chang Guo, Dongning Beijing Jiaotong Univ EIE State Key Lab Rail Traff Control & Safety Beijing Peoples R China Chinese Univ Hong Kong Inst Network Coding Hong Kong Hong Kong Peoples R China Northwestern Univ Dept Elect Engn & Comp Sci Evanston IL USA

ISBN: (纸本)9781467359399;9781467359382

This paper addresses relay design for a wireless multiple-input-multiple-output (MIMO) switching scheme that enables data exchange among multiple users. Here, a multi-antenna relay linearly precodes the received (uplink) signals from multiple users before forwarding the signal in the downlink, where the purpose of precoding is to let each user receive its desired signal with interference from other users suppressed. The problem of optimizing the precoder based on sum-rate maximization criteria is typically non-convex and difficult to solve. The main contribution of this paper is that we show the sumrate maximization problem can be converted to an equivalent weighted sum-MSE minimization problem and can therefore be solved using an iterative algorithm proposed in our previous work. Asymptotic analysis reveals that, with properly chosen initial values, the proposed iterative algorithms are asymptotically optimal in both high and low signal-to-noise-ratio (SNR) regimes for MIMO switching, either with or without self-interference cancellation (a.k.a., physical-layer network coding). Numerical results show that the optimized MIMO switching scheme based on the proposed algorithms significantly outperforms existing approaches in the literature.

关键词： Beamforming linear precoding MIMO switching minimum mean square error (MMSE) physical-layer network coding relay

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Generalized Low-Density (GLD) Lattices

Generalized Low-Density (GLD) Lattices

引用

IEEE Information Theory Workshop (ITW)

作者： Boutros, Joseph J. di Pietro, Nicola Basha, Nour Texas A&M Univ Qatar Doha 23874 Qatar

ISBN: (纸本)9781479959990

We propose the construction of a new family of lattice sphere packings. Given a small-dimensional lattice, we start by building a first lattice in a large dimension by the direct sum of the small lattice. Then, the coordinates of the first large lattice are permuted to yield a second large-dimensional lattice. Finally, our generalized low-density (GLD) lattice is the intersection of the first and the second lattice. We restrict our construction in this paper to integer lattices. GLD lattices are the result of mixing classical lattice theory with modern coding theory. They are potential candidates not only for channel coding as coded modulations, but also for physical-layer network coding and for secure digital communications.

关键词： channel coding network coding coded modulations coding theory generalized low-density lattices large-dimensional lattice lattice sphere packings lattice theory physical-layer network coding secure digital communications small-dimensional lattice Channel coding Constellation diagram Generators Iterative decoding Lattices Maximum likelihood decoding Zinc Channel coding crystal lattices lattice theory Shannon's theory Constellation diagram maximum likelihood decoding Iterative decoding network coding dynamos zinc New families

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OFDM-based Synchronous PNC Communications Using Higher Order QAM Modulations

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

引用

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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Joint Signal and Interference Alignment in Two-Way Relay Communications 81

Joint Signal and Interference Alignment in Two-Way Relay Com...

引用

81st IEEE Vehicular Technology Conference (VTC Spring)

作者： Liang, Yao-Jen Chen, Hsin-Jung Natl Chiayi Univ Dept Elect Engn Chiayi 60004 Taiwan Natl Taiwan Univ Grad Inst Commun Engn Taipei 10764 Taiwan

ISBN: (纸本)9781479980888

In this paper, we study the application of physical layer network coding (PNC) and interference alignment scheme to the joint design of uplink and downlink transmissions, where the base station (BS), the mobile stations (MSs) and the relays all have multiple antennas. Leveraging from the interference alignment and physical-layer network coding, a joint signal and interference alignment scheme is proposed, where uplink and downlink communications can be accomplished within two time slots. Since here two relays share the same spectrum to assist the data transmission, co-channel interference (CI) would be induced and the communication reliability would be deteriorated. To address this challenge, precoding matrices at the BS, the MSs, and relays have been carefully designed to ensure the removal of CI. Additionally, the received signals from BS and MSs are mixed and broadcasted to BS and MSs at the next time duration. Simulation results also demonstrate the performance of the proposed joint signal and interference alignment scheme.

关键词： cellular system two-way relay channel physical-layer network coding interference alignment

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Transmission Protocol Design for Binary physical network Coded Multi-Way Relay networks 79

Transmission Protocol Design for Binary Physical Network Cod...

引用

IEEE 79th Vehicular Technology Conference (VTC-Spring)

作者： Chang, Ronald Y. Lin, Sian-Jheng Chung, Wei-Ho Acad Sinica Res Ctr Informat Technol Innovat Taipei Taiwan

ISBN: (纸本)9781479944828

This paper considers a multi-way relay network in which multiple users intend to achieve full information exchange with one another with the aid of a single relay. A general method for designing the transmission protocol with binary physical-layer network coding (PNC) is developed based on a tree representation. Different transmission schemes are analytically and numerically examined in terms of the decoding strategy, throughput performance, and energy consumption. It is shown that distributing the load of transmissions unevenly among users may achieve a better network throughput performance although some users will consume remarkably more energy than others. A systematic approach to designing the transmission scheme such that minimum error probability is achieved while some specified energy constraint is satisfied is also proposed.

关键词： physical-layer network coding denoise-and-forward multi-way relaying communication protocol tree representation

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Wireless MIMO Switching

Wireless MIMO Switching

引用

IEEE Global Communications Conference (GLOBECOM)

作者： Wang, Fanggang Liew, Soung Chang Beijing Jiaotong Univ EIE State Key Lab Rail Traff Control & Safety Beijing Peoples R China

ISBN: (纸本)9781467309219;9781467309202

In a generic switching problem, a switching pattern consists of a one-to-one mapping from a set of inputs to a set of outputs (i.e., a permutation). We propose and investigate a wireless switching framework in which a multi-antenna relay is responsible for switching traffic among a set of N stations. We refer to such a relay as a MIMO switch. With beamforming and linear detection, the MIMO switch controls which stations are connected to which stations. Each beamforming matrix realizes a permutation pattern among the stations. We refer to the corresponding permutation matrix as a switch matrix. By scheduling a set of different switch matrices, full connectivity among the stations can be established. In this paper, we focus on "fair switching" in which equal amounts of traffic are to be delivered for all the N (N - 1) ordered pairs of stations. In particular, we investigate how the system throughput can be maximized. In general, for large N the number of possible switch matrices N! is huge, making the scheduling problem combinatorially challenging. We show that for N = 4 and 5, only a subset of N - 1 of the N! switch matrices need to be considered in the scheduling problem to achieve good throughput. We conjecture that this will be the case for large N as well. This conjecture, if valid, implies that for practical purposes, fairs-witching scheduling is not an intractable problem.

关键词： Fairness MIMO switching physical-layer network coding relay scheduling

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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...

引用

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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Joint-Denoise-and-Forward Protocol for Multi-Way Relay networks

Joint-Denoise-and-Forward Protocol for Multi-Way Relay Netwo...

引用

Annual Summit and Conference of the Asia-Pacific-Signal-and-Information-Processing-Association (APSIPA)

作者： Chang, Ronald Y. Lin, Sian-Jheng Chung, Wei-Ho Acad Sinica Res Ctr Informat Technol Innovat Taipei Taiwan

ISBN: (纸本)9789869000604

This paper considers a multi-way relay network in which multiple users intend to achieve full information exchange with one another with the aid of a single relay. The denoise-and-forward (DNF) protocol with binary physical-layer network coding (PNC) is considered. A novel denoising scheme is proposed which does not require any modification on the communication mechanism of the original DNF protocol but only exploits the correlation among multiple received signals at the relay. The decision regions and denoise mapping for the proposed scheme and the original scheme are illustrated and compared for an exemplary three-way relay network. Simulation results verify the efficacy of the proposed scheme in achieving improved user decoding performance.

关键词： physical-layer network coding denoise-and-forward multi-way relay networks

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Lattice network Codes over Optimal Lattices in Low Dimensions 7

Lattice Network Codes over Optimal Lattices in Low Dimension...

引用

7th International Workshop on Signal Design and Its Applications in Communications

作者： Shum, Kenneth W. Sun, Qifu Tyler Chinese Univ Hong Kong Inst Network Coding Hong Kong Hong Kong Peoples R China Univ Sci & Technol Sch Comp & Commun Engn Beijing Peoples R China

ISBN: (纸本)9781467383080

Lattice network coding is an important building block of physical-layer network coding. The receiver is required to compute a linear combination of the source symbols belonging to a finite alphabet with an algebraic structure. In this paper, lattice network codes are constructed from lattices that have optimal packing density and the best known shaping gain in low dimensions. Using the efficient quantization functions of these optimallattices, practical lattice network codes are constructed. Simulation results demonstrate that there is a 4 to 5 dB performance gain in comparison to the baseline lattice network code with hyper-cube shaping.

关键词： physical-layer network coding lattice network codes Gosset lattice

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Joint Power Allocation and Beamforming for Multiuser MIMO Two-way Relay networks

Joint Power Allocation and Beamforming for Multiuser MIMO Tw...

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22nd IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

作者： Khafagy, Mohammad El-Keyi, Amr ElBatt, Tamer Nafie, Mohammed Nile Univ Wireless Intelligent Networks Ctr WINC Cairo Egypt

ISBN: (纸本)9781457713484

In this paper, a multiuser cellular two-way relaying scenario is considered where multiple single-antenna mobile stations (MSs) and one multiple-antenna base station (BS) communicate, bidirectionally, via one half-duplex multiple-antenna relay station (RS). Furthermore, the case when the number of antennas at the RS is not sufficient to decode the individual messages is addressed. For this case, a two-phase two-way relaying scenario is considered. In the first phase, the multiple access, a minimum Mean Square Error (MSE) optimization problem is formulated which is found to be non-convex. Thus, an iterative scheme is proposed to compute the MS transmit powers, the BS beamforming vectors, and the corresponding RS linear receivers to minimize the maximum MSE for multiple pairs subject to power constraints on the transmitting terminals. In the second phase, the broadcast phase, the beamforming vectors at the RS are designed to minimize the maximum MSE at the MSs subject to relay power constraints, and the receivers at the BS are designed accordingly. In a two-pair scenario, simulation results are provided showing the superior performance of the proposed methods compared to earlier approaches in terms of the bit-error rate. Also, it is shown that as the system scales up in terms of signal space dimensions and number of accommodated pairs, the performance gap between the proposed scheme and the earlier approaches increases.

关键词： MIMO two-way relaying convex optimization physical-layer network coding multiuser detection

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