IEEE GLOBECOM 2007 - IEEE Global Telecommunications Conference最新文献_第10页

Frequency Agile Interference-Aware Channel Sounding for Dynamic Spectrum Access Networks 动态频谱接入网频率敏捷干扰感知信道测深

IEEE GLOBECOM 2007 - IEEE Global Telecommunications Conference Pub Date : 2007-12-26 DOI: 10.1109/GLOCOM.2007.595

Qi Chen, A. Wyglinski, G. Minden

引用次数: 6

Multimedia Quality Integration Function for Videophone Services 用于可视电话业务的多媒体质量集成功能

IEEE GLOBECOM 2007 - IEEE Global Telecommunications Conference Pub Date : 2007-12-26 DOI: 10.1109/GLOCOM.2007.518

Takanori Hayashi, Kazuhisa Yamagishi, T. Tominaga, A. Takahashi

{"title":"Multimedia Quality Integration Function for Videophone Services","authors":"Takanori Hayashi, Kazuhisa Yamagishi, T. Tominaga, A. Takahashi","doi":"10.1109/GLOCOM.2007.518","DOIUrl":"https://doi.org/10.1109/GLOCOM.2007.518","url":null,"abstract":"We present a multimedia quality integration function that can estimate the overall quality of a videophone service considering multimodality and interactivity. That is, it takes into account individual audiovisual qualities and their delays. Videophone services are rich multimedia services that are expected to become popular on the next-generation network (NGN). To provide ones with sufficient quality, we must properly evaluate, design, and manage users' perceptual quality of service, i.e., quality of experience (QoE). Subjective quality assessment tests were conducted using a PC-based point-to-point interactive videophone application to clarify how overall multimedia quality characteristics depend on the individual audiovisual qualities, absolute audiovisual delay, and media synchronization. From the test results, we formulated a multimedia quality integration function that can accurately evaluate overall multimedia quality. In addition, verification test results showed that this function achieved good performance in terms of correlation coefficient and evaluation error between subjective and estimated qualities. Our model will be a useful QoE planning tool capable of providing feedback on individual qualities as well as the overall multimedia quality of videophone services.","PeriodicalId":370937,"journal":{"name":"IEEE GLOBECOM 2007 - IEEE Global Telecommunications Conference","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114742247","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: 44

Mobile Instant Messaging Service Over Cellular Networks 蜂窝网络上的移动即时通讯服务

IEEE GLOBECOM 2007 - IEEE Global Telecommunications Conference Pub Date : 2007-12-26 DOI: 10.1109/GLOCOM.2007.1008

Z. Naor

引用次数: 4

Contention Based Cooperative Multiple Access for Wireless Packet Networks 基于争用的无线分组网络合作多址

IEEE GLOBECOM 2007 - IEEE Global Telecommunications Conference Pub Date : 2007-12-26 DOI: 10.1109/GLOCOM.2007.267

A. Masuda, S. Shimamoto

引用次数: 4

On the Use of Higher Layer Information for Cognitive Networking 论认知网络中高层信息的使用

IEEE GLOBECOM 2007 - IEEE Global Telecommunications Conference Pub Date : 2007-12-26 DOI: 10.1109/GLOCOM.2007.678

B. S. Manoj, R. Rao, M. Zorzi

{"title":"On the Use of Higher Layer Information for Cognitive Networking","authors":"B. S. Manoj, R. Rao, M. Zorzi","doi":"10.1109/GLOCOM.2007.678","DOIUrl":"https://doi.org/10.1109/GLOCOM.2007.678","url":null,"abstract":"Cognitive radio networking research today mainly focuses on finding efficient ways to let secondary users access radio spectrum that is licensed to primary users, with minimal interference to the license owners. Physical layer cognition, though very important, is complex, expensive, and can provide only limited information about the higher layer traffic. We argue that, even in the absence of physical layer cognitive capability, higher layer traffic information can still be used to generate sufficient cognitive networking information to improve system performance. In this paper, we present an architecture for cognitive networking and an early prototype and experimental setup of a cognitive network access point (CogNet AP), and we describe our observations and lessons learned from this experimental activity. The CogNet AP gathers, processes, analyzes, and stores information available through its monitoring interface in order to build a cognitive local repository which holds the spatio-temporally tagged network traffic information. The inexpensiveness of the components used for building the CogNet AP shows the flexibility of building Cognitive Network elements compared to cognitive radio devices. The proposed cognitive networking architecture and prototype point to the many possible application scenarios and research potential for such systems which use temporal patterns of higher layer traffic information. From our experiments we found that the use of cognitive information derived from higher networking layers resulted in achieving better system throughput.","PeriodicalId":370937,"journal":{"name":"IEEE GLOBECOM 2007 - IEEE Global Telecommunications Conference","volume":"692 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114527770","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: 13

An Adaptive Minimum-BER Approach for Multi-User Detection in STBC-MIMO MC-CDMA Systems STBC-MIMO - MC-CDMA系统中多用户检测的自适应最小误码率方法

IEEE GLOBECOM 2007 - IEEE Global Telecommunications Conference Pub Date : 2007-12-26 DOI: 10.1109/GLOCOM.2007.650

L. D'Orazio, C. Sacchi, Riccardo Fedrizzi, F. D. Natale

{"title":"An Adaptive Minimum-BER Approach for Multi-User Detection in STBC-MIMO MC-CDMA Systems","authors":"L. D'Orazio, C. Sacchi, Riccardo Fedrizzi, F. D. Natale","doi":"10.1109/GLOCOM.2007.650","DOIUrl":"https://doi.org/10.1109/GLOCOM.2007.650","url":null,"abstract":"In the recent years, MIMO MC-CDMA techniques have been proposed in order to increase system capacity over frequency-selective wireless channels. The key feature of MIMO MC-CDMA is the capability of exploiting diversity jointly in time, frequency and in the space domains. Very promising results have been achieved by STBC-MIMO MC-CDMA using receiver schemes targeted to maximize the signal-to-noise plus interference ratio (SINR) at the output of the diversity combiner. Such a concept turns on the minimum mean squared error (MMSE) combining criterion. Nevertheless, it is known by literature that MSE cost function is not always optimal in digital communications. In this work, we are proposing an adaptive multi-user detection approach based on a minimum-BER (M- BER) concept for a synchronous STBC-MIMO MC-CDMA system transmitting data over time-varying multipath fading channels. The practical implementation of the M-BER receiver relies on an adaptive least-mean-square (LMS)-like algorithm, periodically aided by a training sequence and working in decision-directed modality during a coherence time window. Experimental results have shown a performance improvement yielded by the proposed adaptive M-BER MUD with respect to MMSE adaptive MUD achieved by spending an affordable computational effort.","PeriodicalId":370937,"journal":{"name":"IEEE GLOBECOM 2007 - IEEE Global Telecommunications Conference","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114967386","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: 13

QoS and Selfish Users: A MAC Layer Perspective QoS和自私用户:MAC层视角

IEEE GLOBECOM 2007 - IEEE Global Telecommunications Conference Pub Date : 2007-12-26 DOI: 10.1109/GLOCOM.2007.895

P. Nuggehalli, M. Sarkar, R. Rao

{"title":"QoS and Selfish Users: A MAC Layer Perspective","authors":"P. Nuggehalli, M. Sarkar, R. Rao","doi":"10.1109/GLOCOM.2007.895","DOIUrl":"https://doi.org/10.1109/GLOCOM.2007.895","url":null,"abstract":"Many wireless network standards include quality-of-service (QoS) features at the MAC layer. These features provide nodes transmitting real-time traffic such as voice and video preferential access to the channel over nodes carrying best-effort traffic. The success of these QoS mechanisms requires that nodes be honest and truthfully report their application's QoS category. However rational nodes will, if they can, deviate from a standard's specification to maximize their utility. Network interfaces are becoming increasingly programmable and it is possible for nodes to falsely classify their best-effort traffic as real-time traffic to obtain increased throughput. In this paper, we provide a game-theoretic analysis for a slotted Aloha like MAC that resembles the IEEE 802.11e MAC in many essential respects. Our MAC model allows traffic to be classified as either high-priority (HP) or low-priority (LP), and allows for both random access (contention) and polled (contention-free) channel access. We advocate the use of the contention-free access feature as an efficient and protocol-compliant mechanism to incentivize LP users to be truthful. We discuss appropriate utility functions for HP and LP traffic and analyze the performance of the system using the Nash bargaining solution (NBS) concept from cooperative game theory. The NBS concept is used to find a fair and Pareto-optimal operating point for our system. Since users are strategic, we then use the framework of non-cooperative game theory to find the set of Nash equilibria. Somewhat remarkably, we find that the NBS operating point is a Nash equilibrium, implying that our strategy is both efficient and strategy-proof.","PeriodicalId":370937,"journal":{"name":"IEEE GLOBECOM 2007 - IEEE Global Telecommunications Conference","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116949286","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: 13

On Static Code Construction for Alternating Multicast and Simultaneous Multicasts 交替组播和同步组播静态码结构研究

IEEE GLOBECOM 2007 - IEEE Global Telecommunications Conference Pub Date : 2007-12-26 DOI: 10.1109/GLOCOM.2007.276

C. Ngai, Shenghao Yang, R. Yeung

引用次数: 0

Sum-Rate Distortion in MIMO Broadcast Channels with Irregular Limited Feedback 不规则有限反馈MIMO广播信道中的和率失真

IEEE GLOBECOM 2007 - IEEE Global Telecommunications Conference Pub Date : 2007-12-26 DOI: 10.1109/GLOCOM.2007.607

A. Mukherjee, H. Kwon

引用次数: 3

Cooperative Network Coding for Wireless Ad-Hoc Networks 无线Ad-Hoc网络的协同网络编码

IEEE GLOBECOM 2007 - IEEE Global Telecommunications Conference Pub Date : 2007-12-26 DOI: 10.1109/GLOCOM.2007.157

Shengli Fu, K. Lu, Y. Qian, M. Varanasi

引用次数: 54