2011 International Conference on Communications and Information Technology (ICCIT)最新文献_第2页

Joint blind channel estimation for MIMO OFDM systems via nonredundant linear precoding 基于非冗余线性预编码的MIMO OFDM系统联合盲信道估计

2011 International Conference on Communications and Information Technology (ICCIT) Pub Date : 2011-03-29 DOI: 10.1109/ICCITECHNOL.2011.5762694

S. Ghadrdan, S. Salari, M. Ahmadian

引用次数: 2

Design and implement connectors in distributed system 分布式系统中连接器的设计与实现

2011 International Conference on Communications and Information Technology (ICCIT) Pub Date : 2011-03-29 DOI: 10.1109/ICCITECHNOL.2011.5762657

H. Mcheick, Y. Qi, H. Safa, M. Karam

引用次数: 0

Transmit beamforming techniques for space-frequency coded MIMO-OFDM systems in a correlated Ricean fading channel 相关Ricean衰落信道中空频编码MIMO-OFDM系统的发射波束形成技术

2011 International Conference on Communications and Information Technology (ICCIT) Pub Date : 2011-03-29 DOI: 10.1109/ICCITECHNOL.2011.5762695

N. Suraweera, K. Wavegedara

{"title":"Transmit beamforming techniques for space-frequency coded MIMO-OFDM systems in a correlated Ricean fading channel","authors":"N. Suraweera, K. Wavegedara","doi":"10.1109/ICCITECHNOL.2011.5762695","DOIUrl":"https://doi.org/10.1109/ICCITECHNOL.2011.5762695","url":null,"abstract":"In highly spatially correlated channels the diversity gain achieved by space-frequency (SF) coding is significantly low. Nevertheless, when full or partial channel state information is available at the transmitter, improved performance can be obtained by combining transmit beamforming with SF coding. In this paper we propose two novel transmit beamforming techniques based on the minimum pair-wise error probability (PEP) criterion for SF-coded MIMO-OFDM systems in frequency-selective Ricean fading channels. The proposed beamforming techniques (referred to as Technique 1 and Technique 2) require only the channel mean and spatial correlation statistics. Technique 1 optimally distributes the total transmit power among all the eigenmodes of the channel, whereas Technique 2 allocates the total transmit power only to the strongest eigenmodes of the channel. The simulation results demonstrate that Technique 1 and 2 offers considerable performance improvements over a system using only SF coding in low and highly spatially correlated channels, respectively. When compared with Technique 1, Technique 2 is more appealing due to the facts that it has less computational complexity, and that it offers better performance in highly correlated channels for all values of the Ricean-K factor.","PeriodicalId":211631,"journal":{"name":"2011 International Conference on Communications and Information Technology (ICCIT)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127728484","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: 0

Throughput maximization and network-wide service differentiation for IEEE802.11e WLAN IEEE802.11e无线局域网的吞吐量最大化和全网业务差异化

2011 International Conference on Communications and Information Technology (ICCIT) Pub Date : 2011-03-29 DOI: 10.1109/ICCITECHNOL.2011.5762691

O. Shagdar, Kengo Sakai, H. Yomo, Akio Hasegawa, Tatsuo Shibata, R. Miura, S. Obana

引用次数: 4

Cognitive radios power control game under Rayleigh slow fading channel 瑞利慢衰落信道下认知无线电功率控制博弈

2011 International Conference on Communications and Information Technology (ICCIT) Pub Date : 2011-03-29 DOI: 10.1109/ICCITECHNOL.2011.5762678

M. Alayesh, N. Ghani

{"title":"Cognitive radios power control game under Rayleigh slow fading channel","authors":"M. Alayesh, N. Ghani","doi":"10.1109/ICCITECHNOL.2011.5762678","DOIUrl":"https://doi.org/10.1109/ICCITECHNOL.2011.5762678","url":null,"abstract":"In cognitive radio networks, power control is considered to be a very important concern where secondary users, which are equipped with cognitive radios, try to access the unused spectrum of licensed primary users in an opportunistic way. Cognitive radios enable the secondary users to sense the presence of primary users and tune the channel (spectrum band) which is not in use at any time for its use. However, the interactions between secondary users are the only parameters which have been considered in most of the existing studies in this space, and the impact of primary user behaviors has been ignored. Hence, a novel realistic primary-secondary game-theoretic scheme is proposed in this study which rewards primary user for sharing its spectrum and allows secondary users to achieve energy-efficient transmissions. In general, the additive white Gaussian noise channel model is considered to be poor to describe the transmission channel and one must resort to more precise and realistic models such as fading channels. The proposed work here extends the fast flat fading models investigated in [1] and [2] to consider slow flat fading channels, where Rayleigh slow flat fading channel is analyzed and a closed-form expression is derived for the average utility functions. The existence and uniqueness of Nash equilibrium are also shown. Finally, detailed simulation results are presented to verify the performance of the scheme under realistic channel conditions compared to AWGN channel model.","PeriodicalId":211631,"journal":{"name":"2011 International Conference on Communications and Information Technology (ICCIT)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116831117","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

Service selection using quality matchmaking 服务选择使用质量匹配

2011 International Conference on Communications and Information Technology (ICCIT) Pub Date : 2011-03-29 DOI: 10.1109/ICCITECHNOL.2011.5762658

A. Eleyan, Liping Zhao

引用次数: 7

Downstream bandwidth allocation scheme in local access over a distributed control plane 分布式控制平面本地接入下行带宽分配方案

2011 International Conference on Communications and Information Technology (ICCIT) Pub Date : 2011-03-29 DOI: 10.1109/ICCITECHNOL.2011.5762688

A. D. Hossain, H. Erkan, A. Shami

引用次数: 2

A low complexity fine timing offset and channel estimation algorithm for cooperative diversity OFDM system 一种用于合作分集OFDM系统的低复杂度精细定时偏移和信道估计算法

2011 International Conference on Communications and Information Technology (ICCIT) Pub Date : 2011-03-29 DOI: 10.1109/ICCITECHNOL.2011.5762667

M. I. Cheema, S. Khan

引用次数: 1

Critical infrastructure protection: A 21st century challenge 关键基础设施保护:21世纪的挑战

2011 International Conference on Communications and Information Technology (ICCIT) Pub Date : 2011-03-29 DOI: 10.1109/ICCITECHNOL.2011.5762681

M. Merabti, Michael Kennedy, William Hurst

引用次数: 37

Multi-criteria Vertical Handover by TOPSIS and fuzzy logic 基于TOPSIS和模糊逻辑的多准则垂直切换

2011 International Conference on Communications and Information Technology (ICCIT) Pub Date : 2011-03-29 DOI: 10.1109/ICCITECHNOL.2011.5762703

M. Alkhawlani, K. Alsalem, A. Hussein

{"title":"Multi-criteria Vertical Handover by TOPSIS and fuzzy logic","authors":"M. Alkhawlani, K. Alsalem, A. Hussein","doi":"10.1109/ICCITECHNOL.2011.5762703","DOIUrl":"https://doi.org/10.1109/ICCITECHNOL.2011.5762703","url":null,"abstract":"In the next generation heterogeneous wireless networks, a user with a multi-interface terminal may have network access from different service providers using various technologies. Vertical Handover (VHO) is the capability to switch on-going connections from one Radio Access Network (RAN) to another. This switching is based on the discovered accesses, QoS constraints, operator policies, user preferences and available system capacity and utilization. Optimizing the VHO process is an important issue of research, which leads to reduction of network signalling and mobile device power loss and on the other hand improves network quality of service (QoS) and grade of service (GoS). In this paper, a decision support system is developed to address the VHO problem. This system combines fuzzy logic and TOPSIS, a MCDM algorithm, to the problem of VHO. This combination decreases the influence of the dissimilar, imprecise, and contradictory measurements for the VHO criteria coming from different sources. A performance analysis is done and results are compared with traditional algorithms for VHO. These results demonstrate a significant improvement with our developed algorithm.","PeriodicalId":211631,"journal":{"name":"2011 International Conference on Communications and Information Technology (ICCIT)","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133500485","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: 30