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检索条件"主题词=analog network coding"

共 132 条记录，以下是61-70 订阅

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Opportunistic Relaying for Two-Way Relay Transmission with analog network coding

Opportunistic Relaying for Two-Way Relay Transmission with A...

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2011年无线通信与信号处理国际会议(WCSP 2011)

作者： Baoyu Zheng Xiaodong Ji Lei Wang Xing Gao Institute of Signal Processing and Transmission Nanjing Universityof Posts and TelecommunicationsNan National Mobile Communications Research LaboratorySoutheast UniversityNanjing China 210018 School of Electronics and Information Nantong University Nan Tong China 226019

This paper studies the outage performance of a two-way relay transmission, where two user terminals exchange information through a shared relay that exploits analog network coding to deal with the multi-access signals. Starting from some definitions, an exact outage probability of the conventional threenode scenario is derived over frequency-nonselective Rayleigh fading channels. To gain more insight, an approximate expression is also formulated. Following this analysis, opportunistic relaying is considered for multi-relay networks to make a good use of the available diversity degrees of the channel. Then, three significant relay selection strategies, I.e., the max-min, the maxhms and the min-scp policies, are studied and analyzed in terms of outage probability. Simulation experiments are performed and performance comparisons are conducted. The results show that the proposed policies are *** and appropriate methods to implement relay selection and can achieve significant performance gains in terms of outage probability across the whole range of signal-to-noise ratio (SNR) as well as the sources?target rates, which validates the studies in this paper.

关键词： two-way relay transmission opportunistic relaying analog network coding

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Channel Estimation Based on Outage Probability in analog network coding

Channel Estimation Based on Outage Probability in Analog Net...

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2012 IEEE 14th International Conference on Communication Technology

作者： Zhaolong Ning Qingyang Song Lei Guo School of Information Science and Engineering Northeastern University

ISBN: (纸本)9781467321006

network coding is an emerging technique of packet forwarding that encodes the packets at a relay node in the network *** network coding (ANC) encodes the packets by superposing signals at the physical layer,which can further bring throughput *** most previous literatures assume either channel parameters are pre-established or perfect global channel state information (CSI) can be obtained by the relay node,which is unrealistic for a wireless *** this paper,we propose a scheme to estimate channel gains based on outage probability by varying the sampling window in a multi-user two-way relay network,and present a sum rate optimization opportunistic scheduling scheme as an application of the channel estimation *** results are presented to demonstrate the effectiveness of our estimation scheme,and the proposed scheduling scheme outperforms the conventional round robin scheduling scheme significantly.

关键词： analog network coding outage probability opportunistic scheduling two-way relay network.

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Space-Time analog network coding for Multiple Access Relay Channels

Space-Time Analog Network Coding for Multiple Access Relay C...

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IEEE Wireless Communications And networking Conference

作者： Lili Wei Wen Chen Department of Electronic Engineering Shanghai Jiao Tong University China

ISBN: (纸本)9781467359382

network coding is a paradigm for modern communication networks by allowing intermediate nodes to mix messages received from multiple sources. Recently, space-time analog network coding (STANC) has been proposed for non-regenerative multi-way relaying, where multiple nodes are exchanging information through the multi-antenna relay without direct links. In this paper, we investigate STANC in multiple-access relay channels, where multiple nodes communicate to a common destination through a multi-antenna relay with direct links. We discuss several different possible schemes including STANC with Alamouti scheme under three time slots constraints and compare the sum rate and error rate performance.

关键词： multiple access relay channel analog network coding cooperative space-time coding

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DISTRIBUTED DIFFERENTIAL SPACE-TIME coding FOR TWO-WAY RELAY networkS USING analog network coding

DISTRIBUTED DIFFERENTIAL SPACE-TIME CODING FOR TWO-WAY RELAY...

引用

European Signal Processing Conference

作者： Samer Alabed Marius Pesavento Anja Klein Institute of Telecommunications Darmstadt University of Technology Merckstr. 25 64283 Darmstadt Germany

ISBN: (纸本)9781479936878

Differential distributed space-time coding (DSTC) techniques using several transmission protocols have recently been proposed to overcome the overhead involved with the acquisition of channel state information (CSI) required for coherent processing. In this paper, a novel amplify-and-forward differential DSTC technique for two-way wireless relay networks (TWRNs) is proposed, that uses the concept of analog network coding and which does not require CSI at any node to decode the information symbols. In our transmission scheme, the relays do not waste power to transmit known information. This is achieved by combining the symbol vectors of both terminals at the relays into a single symbol vector without decoding the information symbols. Furthermore, in our scheme, the direct link between the communicating terminals can be easily incorporated to further improve the diversity gain. Simulations show a substantially improved performance in terms of bit error rate (BER) of the proposed technique as compared to the known techniques.

关键词： Two-way wireless relay networks distributed space-time coding differential space-time coding cooperative diversity analog network coding

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A Joint Linear-analog network coding Based Protocol for Data Transfer in Underwater Acoustic networks

A Joint Linear-Analog Network Coding Based Protocol for Data...

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Oceans MTS/IEEE Washington (Conference)

作者： Xiaobo Zhao Xiaohong Shen Haiyan Wang Weigang Bai Ruiqin Zhao School of Marine Science and Technology Northwest Polytechnical University

ISBN: (纸本)9781467393744

In underwater acoustic networks, the objective that researchers are pursuing is establishing a network with high reliability, high throughput and low energy consumption. network coding can enhance reliability and throughput of network. Moreover, the throughput of network will be significantly improved by analog network coding. Accordingly, with higher reliability and higher throughput, the energy consumption will be lower. In this paper, the linear network coding and analog network coding are combined creatively. Besides, a SNR estimation algorithm is used to choose packets instead of choosing packets randomly for decoding. Afterwards, for taking advantage of the redundant packets better, packets are refreshed via bit-by-bit comparison. At last, we present numerical experiments to evaluate the performance of this scheme.

关键词： Underwater acoustic networks Linear network coding analog network coding Transport protocol

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THROUGHPUT AND ENERGY OPTIMIZATION OF A COOPERATIVE ARQ SCHEME USING analog network coding

THROUGHPUT AND ENERGY OPTIMIZATION OF A COOPERATIVE ARQ SCHE...

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European Signal Processing Conference

作者： Mariem Ayedi Noura Sellami Mohamed Siala MEDIATRON laboratory SUP'COM Carthage University LETI laboratory ENIS Sfax University

ISBN: (纸本)9781479988518

In this paper, we propose to improve a Cooperative Automatic Repeat reQuest (C-ARQ) scheme through the optimization of the distribution of the average relay energy cost in a two sources one destination wireless system. We consider a BPSK modulated transmission over Rayleigh fading channels. We propose to use specific relay and destination treatment for different possible cases: both received packets are error free, only one received packet is detected erroneous or both received packets are detected erroneous at the destination. We derive semi-analytical bounds of the throughput and the average relay energy. We find the optimal relay energy distribution which maximizes the throughput by using dichotomy search. Numerical results confirm the accuracy of the derived closed form expressions and show the throughput improvement due to the relay energy optimization compared to the conventional cooperative ARQ scheme.

关键词： Cooperative ARQ communication analog network coding Throughput and energy optimization Throughput Automatic repeat request relay destination analog network Closed-form solutions Energy sources Packet Binary phase shift keying Raleigh fading channels dichotomies

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An effective channel estimation scheme for bi-directional two-timeslot OFDM relay transmission using analog network coding

An effective channel estimation scheme for bi-directional tw...

引用

IEEE Vehicular Technology Conference

作者： Yuta Koshimizu Eiji Okamoto Department of Computer Science and Engineering Graduate school of Engineering Nagoya Institute of Technology Gokiso-cho Showa-ku Nagoya-shi 466-8555 Japan

ISBN: (纸本)9781467309899

Recently, relay transmission schemes have been much studied according to increasing demands for ad-hoc wireless communication. In bi-directional relay transmission, the transmission efficiency has been decreased due to the waiting time. To tackle this problem, network coding (NC) has been proposed. The orthogonal frequency division multiplexing (OFDM)-based relay transmission applying analog network coding (ANC) can reduce the number of timeslots per one sequence compared to that without NC and it increases the transmission capacity. However, in the bi-directional relay transmission with ANC, the relay node receives the signals of each transmitting nodes simultaneously and the signal detection must be conducted. To do that, the channel state information of each nodes is needed, and the rate-efficient and accurate channel estimation should be applied for the bidirectional relay, which is not much considered so far. Therefore, in this paper, we propose a new channel estimation scheme for bidirectional two-timeslot OFDM relay transmission where the transmitters send sparse Walsh-code pilots and the receiver detects and estimates each channel information by the correlation processing. The proposed scheme can estimate the channels by less pilot symbols sparsely allocated in OFDM frame. In addition, an accurate interpolation scheme with two-dimensional fast Fourier transform (FFT) is utilized. The performances of the proposed scheme are evaluated by computer simulations.

关键词： effective channel estimation scheme bi-directional two-timeslot analog network coding relay transmission channel estimation analog network Orthogonal frequency division multiplexing bidirectional relay signal acquisition Channel state information information channels transmission capacity Trunk Node Scheme transmission efficiency

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Throughput and stability of digital and analog network coding for wireless networks with single and multiple relays 08

Throughput and stability of digital and analog network codin...

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Proceedings of the 4th Annual International Conference on Wireless Internet

作者： Yalin Evren Sagduyu Dongning Guo Randall Berry Northwestern University Evanston IL

ISBN: (纸本)9789639799363

We evaluate the throughput and stability properties of digital and analog network coding for wireless terminals exchanging broadcast traffic with the assistance of relay nodes. For stochastically varying traffic, the stable operation is compared under the different schemes of plain routing, and digital and analog network coding, at the packet and the signal levels, respectively. For each network coding scheme, the queue dynamics are specified for the terminal and relay nodes, and the maximum throughput region is optimized over all transmission schedules. We then give generalizations of the well-known back-pressure policy for each scheme, which accounts for the coupling of the queues due to network coding and is throughput optimal, i.e., it stabilizes the network whenever this is possible. Our initial analysis focuses on a network with a single relay node. We then discuss extensions of this to arbitrary terminal-relay configurations in a general multihop network. A general framework is established to construct the maximum throughput region and throughput optimal scheduling is jointly designed with network coding for relay networks with general channel rates. For any achievable rates in the maximum throughput region the dynamic scheduling and coding ensure that the average queue lengths at the terminal and relay nodes are asymptotically bounded.

关键词： digital network coding analog network coding throughput optimal control stable throughput region queue stability

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Joint Energy-Efficient Single Relay Selection and Power Allocation for analog network coding with Three Transmission Phases

Joint Energy-Efficient Single Relay Selection and Power Allo...

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IEEE Vehicular Technology Conference

作者： Basem M. ElHalawany Maha Elsabrouty Osamu Muta Adel Abdelrahman Hiroshi Furukawa Egypt-Japan University of Science and Technology (E-JUST) Center for Japan-Egypt Cooperation in Science and Technology Kyushu University Graduate School of Information Science and Electrical Engineering Kyushu University

ISBN: (纸本)9781479944811

The multiple access broadcast (MABC) is an effective two phases transmission (2P) ANC protocol for the half-duplex (HD) communication mode. However, MABC does not make use of channel gain of the direct link (DL) no matter how strong it is. On the other hand, the time division broadcast (TDBC) is known as a three phases transmission (3P) protocol which enables transceivers to utilize DL and thus offers the possibility to achieve higher performance compared with the MABC at the expense of a reduced spectral efficiency due to the one extra transmission phase. In this paper, we investigate a joint single relay selection (SRS) and power allocation schemes for energy-efficient wireless communication systems with analog network coding (ANC) for TDBC, where two-way relay channel with two end nodes and N parallel relay nodes is considered under an assumption of perfect channel-state information (CSI). Our objective is to minimize the total system transmit power consumption under quality-of-service (QoS) constraints for TDBC protocol with joint single relay selection and nodes power allocation. In addition, a zero-forcing based relay signal combining technique that combines the signals received at the 1st and 2nd transmission phases, also known as zero-forcing relay power allocation (ZF-RPA), is investigated. Numerical simulation shows that the traditional variable gain relay power allocation (VG-RPA) is more energy-efficient than the ZF-RPA scheme for TDBC in cases with and without utilizing DL.

关键词： Energy-efficient Single relay selection (SRS) Power allocation analog network coding TDBC

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SISO and MIMO analog network coding Relay Architectures for the Uplink of LTE-Advanced

SISO and MIMO Analog Network Coding Relay Architectures for ...

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IEEE Symposium on Computers and Communication

作者： Kareem Metwaly Mahmoud Alaa Eldin Maha Elsabrouty Alexandria University Egypt-Japan University of Science and Technology

ISBN: (纸本)9781467371957

analog network coding has been successfully employed in conventional two way relaying systems. However, analog two way relaying is successful when the two sender and destination nodes are symmetric. In practical cellular-based mobile communication systems of the likes of Long Term Evolution (LTE), the system is composed of several powerful base-stations and low power users' equipment. Applying classical two way relaying will cause unbearable interference. In this paper we propose applying network coding between two user equipment in the same cell in the uplink direction. We investigate Single Input Single Output (SISO) and Multiple Input Multiple Output (MIMO) models for this scenario. We also study the effect of interference of other nodes in surrounding cells.

关键词： LTE-Advanced analog network coding Uplink model

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