2015 5th International Conference on Communications and Networking (COMNET)最新文献_第2页

Distributed collaborative beamforming designs for real-world applications in relayed and cooperative communications 在中继和协作通信中用于实际应用的分布式协作波束形成设计

2015 5th International Conference on Communications and Networking (COMNET) Pub Date : 2015-11-01 DOI: 10.1109/COMNET.2015.7566622

S. Zaidi, S. Affes

{"title":"Distributed collaborative beamforming designs for real-world applications in relayed and cooperative communications","authors":"S. Zaidi, S. Affes","doi":"10.1109/COMNET.2015.7566622","DOIUrl":"https://doi.org/10.1109/COMNET.2015.7566622","url":null,"abstract":"Three main distributed collaborative beamforming (DCB) designs based on different channel models could be employed in real-world applications where scattering and implementation imperfections might exist: the monochromatic (i.e., single-ray) DCB (M-DCB), the bichromatic (i.e., two-ray) DCB (B-DCB), and the polychormatic (i.e., multi-ray) DCB (P-DCB). In this paper, we perform an analytical comparison, under practical constraints, between these DCB designs in terms of achieved signal-to-noise ratio (SNR) as well as achieved throughput. Assuming the presence of scattering and accounting for implementation errors incurred by each DCB design, we derive closed-form expressions of their true achieved SNRs. Excluding exceptional circumstances of unrealistic low quantization levels (i.e., very large quantization errors) hard to justify in practice, we show that B-DCB always outperforms M-DCB as recently found nominally in ideal conditions. We also show that for low AS B-DCB and P-DCB achieve almost the same SNR while for high AS the latter outperforms the first. Furthermore, this work pushes the performance analysis of DCB to the throughput level by taking into account the feedback overhead cost incurred by each design. We prove both by concordant analysis and simulations that the P-DCB's throughput gain against B-DCB reduces as the channel Doppler frequency increases.","PeriodicalId":314139,"journal":{"name":"2015 5th International Conference on Communications and Networking (COMNET)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125247011","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

The Cloud Broker Architecture for Dependability assurance in cloud services 用于云服务可靠性保证的云代理架构

2015 5th International Conference on Communications and Networking (COMNET) Pub Date : 2015-11-01 DOI: 10.1109/COMNET.2015.7566643

Wiem Abderrahim, Z. Choukair

引用次数: 1

Optimal scheduling of CIOQ switches resources in virtual network environments 虚拟网络环境中CIOQ交换机资源的优化调度

2015 5th International Conference on Communications and Networking (COMNET) Pub Date : 2015-11-01 DOI: 10.1109/COMNET.2015.7566638

Maha Jebalia, Asma BEN LETAIFA, S. Tabbane

引用次数: 2

Clustering enhancement for VANETs in highway scenarios 高速公路场景中VANETs的聚类增强

2015 5th International Conference on Communications and Networking (COMNET) Pub Date : 2015-11-01 DOI: 10.1109/COMNET.2015.7566617

Emna Daknou, Mariem Thaalbi, N. Tabbane

{"title":"Clustering enhancement for VANETs in highway scenarios","authors":"Emna Daknou, Mariem Thaalbi, N. Tabbane","doi":"10.1109/COMNET.2015.7566617","DOIUrl":"https://doi.org/10.1109/COMNET.2015.7566617","url":null,"abstract":"The recent research on reliable data dissemination techniques vehicular ad hoc networks (VANETs) motivates for a stable VANET clustering algorithm. However, considering topology dynamics and the high mobility of vehicles, it's not easy to make the network connected in a restricted delay. In this paper, we develop an enhanced clustering algorithm to form stable clusters for delay-bounded applications (car crash alert, dangerous zone advertisement, etc.) on highway scenarios. Because these applications can't support long cluster formation process, our scheme aims to minimize both the cluster head election and the cluster member selection durations. To achieve this goal, the network partition is initially done by the slowest vehicle in order to accelerate the cluster formation. Then, a multi-metric waiting time function is implemented to select the cluster head. It takes as parameters speed difference and relative distance between neighboring nodes. Finally, we add a switching mechanism which allows for choosing a new substitute cluster head when the current cluster head risks leaving the cluster. This effectively enhances cluster lifetime and reduces frequent re-clustering in high speed scenarios. Simulation results confirm that our technique enables formation of long living and stable clusters in a reduced delay.","PeriodicalId":314139,"journal":{"name":"2015 5th International Conference on Communications and Networking (COMNET)","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125034740","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 11

Early termination techniques for MIMO lattice sequential decoders MIMO点阵顺序解码器的早期终止技术

2015 5th International Conference on Communications and Networking (COMNET) Pub Date : 2015-11-01 DOI: 10.1109/COMNET.2015.7566620

Asma Mejri, G. R. Othman, Mohamed-Achraf Khsiba

引用次数: 0

Optical intensity modulation direct detection versus heterodyne detection: A high-SNR capacity comparison 光强度调制直接检测与外差检测:高信噪比容量的比较

2015 5th International Conference on Communications and Networking (COMNET) Pub Date : 2015-11-01 DOI: 10.1109/COMNET.2015.7566632

A. Chaaban, Mohamed-Slim Alouini

引用次数: 9

Compute-and-forward on Compound Multiple Access Relay Channel 复合多址中继信道的计算转发

2015 5th International Conference on Communications and Networking (COMNET) Pub Date : 2015-11-01 DOI: 10.1109/COMNET.2015.7566623

Ammar Jlassi, L. B. Slama, A. Zaidi, S. Cherif

{"title":"Compute-and-forward on Compound Multiple Access Relay Channel","authors":"Ammar Jlassi, L. B. Slama, A. Zaidi, S. Cherif","doi":"10.1109/COMNET.2015.7566623","DOIUrl":"https://doi.org/10.1109/COMNET.2015.7566623","url":null,"abstract":"In this work, we study a Compound Multiple Access Relay Channel (C-MARC). The system is a simultaneous multicast network where all destinations are intended to receive and decode signals from all transmitters. Particularly, we focus on the model of two transmitters communicating, simultaneously, with two destinations with the help of a half-duplex relay. We extend and adapt the lattice-based compute-and-forward coding scheme to the model we study. This coding scheme is implemented at the relay and at the destinations through some modulo reduction operations. The relay computes one of the linear combinations and then forwards it, simultaneously to the destinations where the other linear combinations will be computed based on the direct transmissions. In this paper, we discuss the design criteria, and derive the allowed symmetric-rate. An optimization problem will then be formulated and solved through a Mixed Integer Quadratic Programming (MIQP) problem. The analysis shows that our coding scheme can offer substantial gain over standard relaying techniques such that amplify-and-forward and decode-and-forward for this model. We illustrate our results through some numerical examples.","PeriodicalId":314139,"journal":{"name":"2015 5th International Conference on Communications and Networking (COMNET)","volume":"58-60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134272501","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Analysis of feedback multi-thresholding in cognitive radio networks based on opportunistic beamforming 基于机会波束形成的认知无线网络反馈多阈值分析

2015 5th International Conference on Communications and Networking (COMNET) Pub Date : 2015-11-01 DOI: 10.1109/COMNET.2015.7566618

Ayman Massaoudi, N. Sellami, M. Siala

引用次数: 1

An Extended Soft Handover scheme for real-time service with QoS guarantee in LTE-A system LTE-A系统中具有QoS保证的实时业务扩展软切换方案

2015 5th International Conference on Communications and Networking (COMNET) Pub Date : 2015-11-01 DOI: 10.1109/COMNET.2015.7566642

Imen Jouili, M. Frikha, H. Tounsi

引用次数: 3

System performance of cellular network underlaying D2D multi-hop communication 基于D2D多跳通信的蜂窝网络系统性能

2015 5th International Conference on Communications and Networking (COMNET) Pub Date : 2015-11-01 DOI: 10.1109/COMNET.2015.7566629

Leila Melki, S. Najeh, Hichem Besbes

引用次数: 2