2006 IEEE 17th International Symposium on Personal, Indoor and Mobile Radio Communications最新文献_第7页

Multihop Mobile Communications System Adopting Fixed Relay Stations and its Time Slot Allocation Schemes 采用固定中继站的多跳移动通信系统及其时隙分配方案

2006 IEEE 17th International Symposium on Personal, Indoor and Mobile Radio Communications Pub Date : 2006-12-11 DOI: 10.1109/PIMRC.2006.254244

T. Ohseki, N. Fuke, H. Ishikawa, Y. Takeuchi

{"title":"Multihop Mobile Communications System Adopting Fixed Relay Stations and its Time Slot Allocation Schemes","authors":"T. Ohseki, N. Fuke, H. Ishikawa, Y. Takeuchi","doi":"10.1109/PIMRC.2006.254244","DOIUrl":"https://doi.org/10.1109/PIMRC.2006.254244","url":null,"abstract":"In this paper, we present a multihop mobile communications system utilizing fixed relay stations to enhance the coverage of the service area. A multihop mobile communications system was originally proposed as a system in which only mobile stations relay communication between other mobile stations and a base station to solve the problem of poor coverage expected in a future cellular system. In the system, however, a probability of a mobile station being able to connect with a base station via their relay functions is governed by a probability of mobile stations existing in its neighborhood. Therefore, we introduce fixed stations as relay stations in addition to relay functions of mobile stations to enhance the probability of link conductivity between a base station and a mobile station. By adopting this multihop architecture, a mobile station which needs relay functions can choose relay stations among fixed relay stations or other mobile stations. Moreover, we also examine its time slot allocation methods. We confirmed that the ratio of successful connection between mobile stations and base stations improved about 0.15 by introducing just 4 fixed relay stations in a certain environment","PeriodicalId":325797,"journal":{"name":"2006 IEEE 17th International Symposium on Personal, Indoor and Mobile Radio Communications","volume":"355 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122044937","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: 8

Linear Scalable Dispersion Codes for Downlink MIMO MC-CDMA Systems 下行MIMO MC-CDMA系统的线性可扩展色散码

2006 IEEE 17th International Symposium on Personal, Indoor and Mobile Radio Communications Pub Date : 2006-12-11 DOI: 10.1109/PIMRC.2006.254320

M. Sarkiss, Y. Yuan-Wu

引用次数: 0

Cost-Aware Dynamic Routing Protocol for Wireless Sensor Networks - Design and Prototype Experiments 无线传感器网络的成本感知动态路由协议。设计和原型实验

2006 IEEE 17th International Symposium on Personal, Indoor and Mobile Radio Communications Pub Date : 2006-12-11 DOI: 10.1109/PIMRC.2006.254185

J. Suhonen, M. Kuorilehto, Marko Hännikäinen, T. Hämäläinen

引用次数: 34

Unlicensed Operation of IEEE 802.16: Coexistence with 802.11(A) in Shared Frequency Bands IEEE 802.16的无证运行:与802.11(A)在共享频段共存

2006 IEEE 17th International Symposium on Personal, Indoor and Mobile Radio Communications Pub Date : 2006-12-11 DOI: 10.1109/PIMRC.2006.254030

L. Berlemann, C. Hoymann, G. Hiertz, B. Walke

{"title":"Unlicensed Operation of IEEE 802.16: Coexistence with 802.11(A) in Shared Frequency Bands","authors":"L. Berlemann, C. Hoymann, G. Hiertz, B. Walke","doi":"10.1109/PIMRC.2006.254030","DOIUrl":"https://doi.org/10.1109/PIMRC.2006.254030","url":null,"abstract":"The coexistence of IEEE 802.16 (WiMAX) and IEEE 802.11 (WiFi) in shared radio spectrum is an acute problem. In license-exempt frequency bands, the frame-based medium access of 802.16 requires rigorous protection against interference from wireless local area networks in order to operate properly when sharing spectrum. We focus here on the unlicensed U-NII frequency band at 5 GHz and consider therefore the distributed medium access of 802.11(a) as competitor for spectrum utilization. We expect 802.16 systems to be available in laptops soon and then to provide wireless VoIP services that 802.11 cannot support satisfactorily well. Therefore, this paper describes approaches for enabling a reliable operation of 802.16 when sharing unlicensed spectrum with 802.11. We propose software upgrades to the medium access control of the 802.16 BS. Thereby, no 802.11 frame transmissions are required by an 802.16 system. Coexistence between 802.16 and 802.11 is enabled without any data exchange between both standards. Our solution of the described coexistence problem implies the possibility to guarantee quality-of-service within the 802.16 system although operating in unlicensed frequencies","PeriodicalId":325797,"journal":{"name":"2006 IEEE 17th International Symposium on Personal, Indoor and Mobile Radio Communications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129624041","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: 45

A Statistical Analysis of the Effect of Capacity Limitation and Retry for Hierarchical Wireless Hybrid Networks 分层无线混合网络容量限制与重试影响的统计分析

2006 IEEE 17th International Symposium on Personal, Indoor and Mobile Radio Communications Pub Date : 2006-12-11 DOI: 10.1109/PIMRC.2006.254152

J. Orriss, R. Verdone

{"title":"A Statistical Analysis of the Effect of Capacity Limitation and Retry for Hierarchical Wireless Hybrid Networks","authors":"J. Orriss, R. Verdone","doi":"10.1109/PIMRC.2006.254152","DOIUrl":"https://doi.org/10.1109/PIMRC.2006.254152","url":null,"abstract":"We investigate a hierarchical wireless hybrid network, implementing two different network paradigms: ad hoc and infrastructure-based systems, where mobile gateways, equipped with both cellular and infrastructure-less air interfaces, allow integration of the two separate paradigms. The paper reports results achieved through a mathematical analysis of the topology of wireless links, providing the distribution of the number of lowest-level nodes attached to the highest level. Nodes have a maximum capacity, and seek service at the upper level through a retry mechanism where the nodes are addressed according to a ranked list based on the level of received power. The mathematical analysis provides a means to allow access control, depending on the maximum number of radio resource units available at each node and the maximum number of retries at each level. Wireless nodes at different levels are uniformly distributed over the bi-dimensional plane with different densities; path loss and shadowing are included with different propagation parameters, different air interfaces are used, and different hard capacities characterise the nodes at the different levels. With respect to other papers recently presented by the authors to other conferences, this work focuses on the role of the node capacity limitations and the maximum number of retries","PeriodicalId":325797,"journal":{"name":"2006 IEEE 17th International Symposium on Personal, Indoor and Mobile Radio Communications","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127032550","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

On the Probability of Adaptation Error in MIMO Systems MIMO系统自适应误差的概率研究

2006 IEEE 17th International Symposium on Personal, Indoor and Mobile Radio Communications Pub Date : 2006-12-11 DOI: 10.1109/PIMRC.2006.254016

P. Kuo, Peter J. Smith

引用次数: 6

Blind Moment Estimation Techniques for I/Q Imbalance Compensation in Quadrature Receivers 正交接收机I/Q不平衡补偿的盲矩估计技术

2006 IEEE 17th International Symposium on Personal, Indoor and Mobile Radio Communications Pub Date : 2006-12-11 DOI: 10.1109/PIMRC.2006.254374

L. Anttila, M. Valkama, M. Renfors

{"title":"Blind Moment Estimation Techniques for I/Q Imbalance Compensation in Quadrature Receivers","authors":"L. Anttila, M. Valkama, M. Renfors","doi":"10.1109/PIMRC.2006.254374","DOIUrl":"https://doi.org/10.1109/PIMRC.2006.254374","url":null,"abstract":"When targeting receiver integrability and flexibility, the choice of the front-end architecture is in key position. Instead of the traditional superheterodyne architecture, more recent I/Q or quadrature receiver front-ends are receiving increasingly more interest. One crucial aspect in quadrature receiver front-ends is the amplitude and phase matching of the analog I and Q signal branches. I/Q mismatches result in incomplete image signal or mirror frequency attenuation which must be enhanced using additional analog or digital signal processing. This paper presents and analyzes a novel DSP-based blind (non-data-aided) technique for I/Q imbalance compensation, utilizing a property of the ideal baseband equivalent called circularity. The weights of the compensator are computed directly from the estimates of the second-order moments of the mismatched baseband equivalent received signal. This algorithm is further simplified, with minimal loss in performance, yielding an extraordinarily simple yet effective compensation technique which ideally triples the dB value of the analog front-end image rejection ratio. The algorithms are applicable to any I/Q receiver structure, whether single-channel or multi-channel, and are in fact totally independent of any specific structure or characteristic (other than circularity) of the ideal baseband equivalent signal","PeriodicalId":325797,"journal":{"name":"2006 IEEE 17th International Symposium on Personal, Indoor and Mobile Radio Communications","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129975023","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: 47

OFDM-UWB Physical Layer Emulation for Event-Based MAC Simulation 基于事件的MAC仿真的OFDM-UWB物理层仿真

2006 IEEE 17th International Symposium on Personal, Indoor and Mobile Radio Communications Pub Date : 2006-12-11 DOI: 10.1109/PIMRC.2006.254474

Sebastian Max, Yunpeng Zang, Hans-Jürgen Reumerman

引用次数: 6

Measurement of 3GHz-band Radio Propagation in Macro Cellular Environments 宏蜂窝环境下3ghz波段无线电传播的测量

2006 IEEE 17th International Symposium on Personal, Indoor and Mobile Radio Communications Pub Date : 2006-12-11 DOI: 10.1109/PIMRC.2006.254029

R. Funada, H. Harada, M. Otani

引用次数: 1

Performance Evaluation of Novel DSA Scheme that Combines Polling Method with Random Access Method 结合轮询法和随机存取法的新型DSA方案性能评价

2006 IEEE 17th International Symposium on Personal, Indoor and Mobile Radio Communications Pub Date : 2006-12-11 DOI: 10.1109/PIMRC.2006.253976

Y. Shimizu, F. Nuno

{"title":"Performance Evaluation of Novel DSA Scheme that Combines Polling Method with Random Access Method","authors":"Y. Shimizu, F. Nuno","doi":"10.1109/PIMRC.2006.253976","DOIUrl":"https://doi.org/10.1109/PIMRC.2006.253976","url":null,"abstract":"Ubiquitous wireless networks and wireless sensor networks, which consist of access points and a number of wireless terminals with simple functions, provide users with a wide range of applications such as environment monitoring and traffic surveillance. In these networks, even though each terminal sends only small data amounts at comparatively long transmission intervals, traffic loads are significant due to the very large number of terminals. The access point must be capable of accommodating the great many wireless terminals, while providing high throughput performance. This can be achieved by employing DSA, a typical centralized media access control scheme, since it has high resource utilization efficiency. In this paper, we propose a novel DSA scheme that employs both a polling-based method and a random access method; it improves throughput by using the feature that most terminals tend to send data periodically. In this scheme, the access point polls the terminals to decrease the random accesses made by the terminals as much as possible. Simulations verify that the proposed scheme offers better throughput performance than the conventional scheme","PeriodicalId":325797,"journal":{"name":"2006 IEEE 17th International Symposium on Personal, Indoor and Mobile Radio Communications","volume":"21 10","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132974399","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