2007 IEEE 66th Vehicular Technology Conference最新文献_第7页

On Distributed and Self-Organized Inter-Cell Interference Mitigation for OFDMA Downlink in IMT-Advanced Radio Systems imt -先进无线电系统OFDMA下行链路分布式自组织小区间干扰抑制研究

2007 IEEE 66th Vehicular Technology Conference Pub Date : 2007-10-15 DOI: 10.1109/VETECF.2007.367

Xiaoben He, K. Valkealahti

引用次数: 3

Voice over IP Realized for the 3GPP Long Term Evolution 实现3GPP长期演进的IP语音

2007 IEEE 66th Vehicular Technology Conference Pub Date : 2007-10-15 DOI: 10.1109/VETECF.2007.306

F. Persson

引用次数: 41

New TTI Value-Added Services Converged Over a Hybrid-Network 基于混合网络融合的新型TTI增值业务

2007 IEEE 66th Vehicular Technology Conference Pub Date : 2007-10-15 DOI: 10.1109/VETECF.2007.410

Soonchoul Kim, Youngho Jeong, Geon Kim, Chunghyun Ahn, S. Lee

引用次数: 0

Analytical Envelope Correlation and Outage Probability of Maximal-Ratio Combined Rician Fading Channels 最大比组合衰落信道的包络相关性和中断概率分析

2007 IEEE 66th Vehicular Technology Conference Pub Date : 2007-10-15 DOI: 10.1109/VETECF.2007.202

Zhuwei Wang, Yanfen Hu, Xubin Chen, Xin Zhang, Dacheng Yang

引用次数: 0

An Energy-Efficient and Receiver-Driven MAC Protocol for Wireless Sensor Networks 无线传感器网络中一种节能且接收器驱动的MAC协议

2007 IEEE 66th Vehicular Technology Conference Pub Date : 2007-10-15 DOI: 10.1109/VETECF.2007.44

Wee Lum Tan, W. Lau, On-ching Yue

{"title":"An Energy-Efficient and Receiver-Driven MAC Protocol for Wireless Sensor Networks","authors":"Wee Lum Tan, W. Lau, On-ching Yue","doi":"10.1109/VETECF.2007.44","DOIUrl":"https://doi.org/10.1109/VETECF.2007.44","url":null,"abstract":"This paper proposes an energy-efficient and receiver-driven, TDMA-based MAC protocol (RMAC) for wireless sensor networks. By placing the ownership of the timeslots in the hands of the receiver nodes and letting the receiver nodes assign the timeslots to their neighboring sender nodes, RMAC not only eliminates the need for the sender nodes to explicitly wake-up a receiver node for data transmission, but also eliminates any collision or contention overhead among the sender nodes. Our simulation results show that RMAC outperforms other sender- driven, TDMA-based MAC protocols in terms of the packet latency and power consumption. We also devised a mechanism to enable unused timeslots to be \"stolen\" by other sender nodes and show that in the case of uniform timeslots assignment among the sender nodes, \"timeslots stealing\" increases the network capacity by as much as 200%. In addition, we propose a simple timeslots reassignment procedure to allow the receiver nodes to redistribute the timeslots among the sender nodes according to their offered traffic load, and show that it enables the network to efficiently reduce the packet latency in the face of asymmetric, bursty traffic patterns.","PeriodicalId":261917,"journal":{"name":"2007 IEEE 66th Vehicular Technology Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116576508","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

Impact of a Radio Access Network Capacity on the HSDPA Link Performance 无线接入网容量对HSDPA链路性能的影响

2007 IEEE 66th Vehicular Technology Conference Pub Date : 2007-10-15 DOI: 10.1109/VETECF.2007.60

Xinzhi Yan, J. Khan, B. Jones

引用次数: 1

Switched Opportunistic Packet Scheduling for High Speed Packet Access MIMO Systems 高速分组接入MIMO系统的交换机会分组调度

2007 IEEE 66th Vehicular Technology Conference Pub Date : 2007-10-15 DOI: 10.1109/VETECF.2007.386

N. Hamdi, Aymen Ben Cheikha

{"title":"Switched Opportunistic Packet Scheduling for High Speed Packet Access MIMO Systems","authors":"N. Hamdi, Aymen Ben Cheikha","doi":"10.1109/VETECF.2007.386","DOIUrl":"https://doi.org/10.1109/VETECF.2007.386","url":null,"abstract":"In this paper, we propose an algorithm for scheduling users in wireless MIMO systems. The scheduler in the base station defines a utility function for each user that depends on the user transmissible rates and the user QoS criteria. For each channel scheduling epoch, the scheduler has to resolve the maximization of a system utility concave function. This optimization needs a long time of processing, which leads to a constraint in practical implementation. In this paper, we present an alternative solution, by using a weak control on the opportunistic selection. Thus, the selected user would combine a good channel condition and a low user performance. Therefore, if the user reaches a minimum level of performance and experiences an instantaneous transmissible rate greater than a predefined threshold, he would be selected for receiving packets. If the user with the worst case performance has a transmissible rate lower than the threshold, he would be selected, if he owns the max instantaneous transmissible rate compared to other users in the same conditions. The switching between these two groups of users is defined by the result of a logical function that indicates the group of the user that has a critic performance. Accordingly, the proposed algorithm can be viewed as the opportunistic scheduling algorithm under adaptive weak control of the QoS requirements. The system used for this analysis is the downlink of a single cell. A selection of numerical results is presented to compare the proposed scheduling algorithm to other scheduling schemes.","PeriodicalId":261917,"journal":{"name":"2007 IEEE 66th Vehicular Technology Conference","volume":"2015 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127776515","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

Maximum Likelihood Ratio Spectrum Detection Model for Multicarrier Modulation Based Cognitive Radio Systems 基于多载波调制的认知无线电系统的最大似然比频谱检测模型

2007 IEEE 66th Vehicular Technology Conference Pub Date : 2007-10-15 DOI: 10.1109/VETECF.2007.359

T. Luo, Weidong Xiang, Tao Jiang, Zhigang Wen

引用次数: 2

A Spatial Multiplexing MIMO Scheme with Beamforming for Downlink Transmission 基于波束形成的下行传输空间复用MIMO方案

2007 IEEE 66th Vehicular Technology Conference Pub Date : 2007-10-15 DOI: 10.1109/VETECF.2007.156

Fang Shu, Lihua Li, Xiaofeng Tao, Ping Zhang

引用次数: 14

Finite Impulse Response Cyclic Shift Transmit Diversity for Broadband Mobile OFDM 宽带移动OFDM的有限脉冲响应循环移位发射分集

2007 IEEE 66th Vehicular Technology Conference Pub Date : 2007-10-15 DOI: 10.1109/VETECF.2007.118

W. Hillery, T. Krauss, B. Mondal, T. Thomas, F. Vook

{"title":"Finite Impulse Response Cyclic Shift Transmit Diversity for Broadband Mobile OFDM","authors":"W. Hillery, T. Krauss, B. Mondal, T. Thomas, F. Vook","doi":"10.1109/VETECF.2007.118","DOIUrl":"https://doi.org/10.1109/VETECF.2007.118","url":null,"abstract":"This paper introduces an open-loop transmit diversity method called finite impulse response cyclic shift diversity (FIR-CSD) for broadband mobile OFDM systems. Ordinary CSD operates in OFDM by cyclically shifting the same time- domain signal by different cyclic shift values on each transmit antenna branch. Unfortunately, in some channels (such as a line of sight channel or a heavily spatially correlated channel), ordinary CSD introduces deep spectral nulls in the composite frequency response seen by the receiver, which results in a performance loss relative to the single transmit antenna case. FIR-CSD is an extension of the CSD concept wherein multiple weighted and circular shifted copies of the time-domain signal are combined and transmitted on each antenna. Each transmit antenna essentially uses a different FIR filter that combines multiple weighted and circularly-shifted copies of the time-domain signal to be transmitted. Careful selection of the circular shift values and weighting factors on each transmit antenna can significantly reduce or eliminate the deep spectral nulls that ordinary CSD would produce in the above mentioned channels. This paper shows that FIR-CSD provides a significant performance improvement over the original cyclic shift diversity method, especially in correlated channels and with high-rate coding.","PeriodicalId":261917,"journal":{"name":"2007 IEEE 66th Vehicular Technology Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124402658","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: 5