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2007 2nd International Symposium on Wireless Pervasive Computing最新文献

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Opportunistic Radio and Licensed Users Coexistence in Cellular Networks 蜂窝网络中的机会无线电和许可用户共存
2007 2nd International Symposium on Wireless Pervasive Computing Pub Date : 2007-04-16 DOI: 10.1109/ISWPC.2007.342662
A. Pereira, A. Gameiro
{"title":"Opportunistic Radio and Licensed Users Coexistence in Cellular Networks","authors":"A. Pereira, A. Gameiro","doi":"10.1109/ISWPC.2007.342662","DOIUrl":"https://doi.org/10.1109/ISWPC.2007.342662","url":null,"abstract":"A scenario based on an UMTS TDD opportunistic cellular system that operates over UMTS FDD licensed cellular networks is considered. Therefore we develop a simulation tool that addresses the goal of analysis and assessment of UMTS TDD opportunistic radio system in a coexistence environment with UMTS FDD primary cellular networks. The communication presents the main features of the tool, discusses and proposes metrics to evaluate the multisystem coexistence, and presents illustrative simulation results. These show that with a reasonable UMTS TDD opportunistic radio transmission power and considering realistic propagation environments, a moderate number of available frequencies allow the deployment of UMTS TDD opportunistic radio networks with small blocking probabilities","PeriodicalId":403213,"journal":{"name":"2007 2nd International Symposium on Wireless Pervasive Computing","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117149307","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
Call Admission Control in Wireless DS-CDMA Systems using Actor-Critic Reinforcement Learning 基于actor - critical强化学习的无线DS-CDMA系统呼叫接纳控制
2007 2nd International Symposium on Wireless Pervasive Computing Pub Date : 2007-04-16 DOI: 10.1109/ISWPC.2007.342590
Pitipong Chanloha, W. Usaha
{"title":"Call Admission Control in Wireless DS-CDMA Systems using Actor-Critic Reinforcement Learning","authors":"Pitipong Chanloha, W. Usaha","doi":"10.1109/ISWPC.2007.342590","DOIUrl":"https://doi.org/10.1109/ISWPC.2007.342590","url":null,"abstract":"This paper addresses the call admission control (CAC) problem for multiple services in the uplink of a cellular system using direct sequential code division multiple access (DS-CDMA) when taking into account the physical layer channel and receiver structure at the base station. The problem is formulated as a semi-Markov decision process (SMDP) with constraints on the blocking probabilities and signal-to-interference ratio (SIR). The objective is to find a CAC policy which maximizes the throughput while still satisfying these quality-of-service (QoS) constraints. To solve for a near optimal CAC policy, an online decision-making algorithm based on an actor-critic with temporal-difference learning from a paper is modified by parameterizing the reward signal to deal with the QoS constraints. The proposed algorithm circumvents the computational complexity experienced in conventional dynamic programming techniques","PeriodicalId":403213,"journal":{"name":"2007 2nd International Symposium on Wireless Pervasive Computing","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117153546","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
Minimizing Location Uncertainty in Deployment of Access Points 最小化接入点部署中的位置不确定性
2007 2nd International Symposium on Wireless Pervasive Computing Pub Date : 2007-04-16 DOI: 10.1109/ISWPC.2007.342670
P. Zhuang, Qingguo Wang, Yi Shang, Hongchi Shi
{"title":"Minimizing Location Uncertainty in Deployment of Access Points","authors":"P. Zhuang, Qingguo Wang, Yi Shang, Hongchi Shi","doi":"10.1109/ISWPC.2007.342670","DOIUrl":"https://doi.org/10.1109/ISWPC.2007.342670","url":null,"abstract":"In recent years, wireless sensor networks have been applied to several applications of data gathering and target localization across large geographical areas. In this paper, based on a representative sensor network system for lost hiker localization in wilderness areas, we study the problem of sensor/access-point deployment in constrained environments with the goal of minimizing localization uncertainty. We first present theoretical analysis of the problems for different problem attributes. Then we propose an efficient two-phase algorithm to find the access point placement with four different heuristics. In addition, we present experimental results to compare the performance of different heuristics and one heuristic namely divide-merge is shown to outperform all others and achieves solutions very close to the optimal","PeriodicalId":403213,"journal":{"name":"2007 2nd International Symposium on Wireless Pervasive Computing","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117094563","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
Motion Based Reference-Free Quality Estimation for H.264/AVC Video Streaming 基于运动的H.264/AVC视频流无参考质量估计
2007 2nd International Symposium on Wireless Pervasive Computing Pub Date : 2007-04-16 DOI: 10.1109/ISWPC.2007.342629
M. Ries, O. Nemethova, Markus Rupp
{"title":"Motion Based Reference-Free Quality Estimation for H.264/AVC Video Streaming","authors":"M. Ries, O. Nemethova, Markus Rupp","doi":"10.1109/ISWPC.2007.342629","DOIUrl":"https://doi.org/10.1109/ISWPC.2007.342629","url":null,"abstract":"The scope of this paper is the estimation of subjective video quality for low resolution video sequences as they are typical for mobile video streaming. Although the video quality experienced by users depends on spatial (edges, colors, ...) and more considerably on temporal (movement speed, direction, ...) features of the video sequence, most of the proposed methods are based on spatial features. This paper presents a new reference free approach for quality estimation based on motion character. The character of motion is determined by the amount and direction of the motion between two scene changes. In this paper, the design of a universal reference-free video quality metric is presented. The design of the quality metric is based on content adaptive parameters, allowing for content dependent video quality estimation. The performance of the proposed universal metric was evaluated with various video content types and compressions settings. The results show that the proposed approach provides powerful means of estimating the video quality experienced by users for low resolution video streaming services","PeriodicalId":403213,"journal":{"name":"2007 2nd International Symposium on Wireless Pervasive Computing","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126979935","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
PPM-based Orthogonal Space-Time Coding for IR-UWB MIMO channels affected by Poisson-distributed Multipaths 泊松分布多径影响下基于ppm的IR-UWB MIMO信道正交空时编码
2007 2nd International Symposium on Wireless Pervasive Computing Pub Date : 2007-04-16 DOI: 10.1109/ISWPC.2007.342602
E. Baccarelli, M. Biagi, C. Pelizzoni, N. Cordeschi
{"title":"PPM-based Orthogonal Space-Time Coding for IR-UWB MIMO channels affected by Poisson-distributed Multipaths","authors":"E. Baccarelli, M. Biagi, C. Pelizzoni, N. Cordeschi","doi":"10.1109/ISWPC.2007.342602","DOIUrl":"https://doi.org/10.1109/ISWPC.2007.342602","url":null,"abstract":"In this contribution we develop a single multiple-input multiple-output impulse radio UWB (IR-UWB) transceiver for orthogonal (OPPM) data transmitted over (baseband) multipath faded MIMO channels. The proposed maximum-likelihood receiver results to be \"partially coherent\", because it is optimized to work without any information on the path gains, but only on the knowledge of the arrivals' times of the transmitted signals' replicas. The performance of the proposed transceiver are evaluated via three suitable versions of the Union-Chernoff bound related to several indoor and outdoor propagation scenarios, and through such limits we introduce a novel family of unitary orthogonal space-time block codes (e.g., the space-time OPPM (STOPPM) codes), that are able to attain the maximum of diversity and coding gains","PeriodicalId":403213,"journal":{"name":"2007 2nd International Symposium on Wireless Pervasive Computing","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121925035","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: 3
Energy-Aware Communication Module Selection through ZigBee Paging for Ubiquitous Wearable Computers with Multiple Radio Interfaces 基于ZigBee寻呼的可穿戴计算机多无线接口节能通信模块选择
2007 2nd International Symposium on Wireless Pervasive Computing Pub Date : 2007-04-16 DOI: 10.1109/ISWPC.2007.342570
S. Kim, J. Chong, B. H. Jung, M. Kang, D. Sung
{"title":"Energy-Aware Communication Module Selection through ZigBee Paging for Ubiquitous Wearable Computers with Multiple Radio Interfaces","authors":"S. Kim, J. Chong, B. H. Jung, M. Kang, D. Sung","doi":"10.1109/ISWPC.2007.342570","DOIUrl":"https://doi.org/10.1109/ISWPC.2007.342570","url":null,"abstract":"Ubiquious wearable computers (UWCs) with multiple radio interfaces such as WLAN, Bluetooth and ZigBee will play an important role in future ubiquitous network environments. UWCs with a conventional mechanism are assumed to maintain the power-on state of multiple communication modules to communicate with each other at any time. This 'always-on' operation wastes the energy of UWCs and decreases the lifetime of UWCs. To reduce the energy consumption in UWCs, we propose an energy-aware communication module selection scheme through ZigBee paging in UWCs. The energy-aware communication module selection scheme predicts energy consumption for transmitting the given data and selects a communication module which consumes the minimum energy. A ZigBee paging mechanism is used to turn on or off the corresponding communication modules when they have data to send or no data to send, respectively. Experimental results show that the proposed energy-aware communication module selection scheme through ZigBee paging reduces energy consumption by 6%, 93%, and 97% for WLAN, Bluetooth, and ZigBee, respectively, compared with the conventional mechanism","PeriodicalId":403213,"journal":{"name":"2007 2nd International Symposium on Wireless Pervasive Computing","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127422728","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: 12
On the Performance of SIC-MMSE Turbo Equalization with Iterative Channel Estimation for UCCI-Limited MIMO-ISI Systems ucci受限MIMO-ISI系统SIC-MMSE Turbo均衡与迭代信道估计性能研究
2007 2nd International Symposium on Wireless Pervasive Computing Pub Date : 2007-04-16 DOI: 10.1109/ISWPC.2007.342564
T. Ait-Idir, S. Saoudi
{"title":"On the Performance of SIC-MMSE Turbo Equalization with Iterative Channel Estimation for UCCI-Limited MIMO-ISI Systems","authors":"T. Ait-Idir, S. Saoudi","doi":"10.1109/ISWPC.2007.342564","DOIUrl":"https://doi.org/10.1109/ISWPC.2007.342564","url":null,"abstract":"This paper focuses on the problem of turbo equalization for MIMO frequency selective fading channels under the presence of unknown co-channel interference (UCCI). We develop an approach where paths' gains computation, UCCI plus noise covariance matrix estimation, signals equalization and detection, and channel decoding are performed in an iterative fashion. A computationally efficient method based on a MMSE criterion and successive interference cancellation (SIC) is used for channel equalization. The proposed receiver is validated through Monte-Carlo simulations","PeriodicalId":403213,"journal":{"name":"2007 2nd International Symposium on Wireless Pervasive Computing","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129967184","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
Performance Analysis of Angle Modulated MQAM Transmission Techniques 角度调制MQAM传输技术的性能分析
2007 2nd International Symposium on Wireless Pervasive Computing Pub Date : 2007-04-16 DOI: 10.1109/ISWPC.2007.342659
V. Zaharov, A. B. Kokhanov
{"title":"Performance Analysis of Angle Modulated MQAM Transmission Techniques","authors":"V. Zaharov, A. B. Kokhanov","doi":"10.1109/ISWPC.2007.342659","DOIUrl":"https://doi.org/10.1109/ISWPC.2007.342659","url":null,"abstract":"We introduce a novel method of digital modulation with a high spectral efficiency, called the angle (exponentially) modulated m-ary quadrature amplitude modulation (EM-MQAM). The main advantage of EM-MQAM is an ability to transmit a multilevel 2-D MQAM constellation as a constant envelope signal. It makes EM-MQAM a preferred technique for application in multipath fading channel since no amplitude discrimination in the receiver is needed. The transmission bandwidth and BER performance of EM-MQAM have been analyzed. Despite of the fact that EM-MQAM requires as twice as much of the transmit bandwidth compared to the conventional MQAM, it provides reasonable trade-off between transmit bandwidth and BER performance. Furthermore, EM-MQAM requires just 1 dB of extra transmit power if the order of original MQAM increases fourfold.","PeriodicalId":403213,"journal":{"name":"2007 2nd International Symposium on Wireless Pervasive Computing","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129979356","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
Channel-Change Games for Highly Interfering Spectrum-Agile Wireless Networks 高干扰频谱敏捷无线网络的信道变换博弈
2007 2nd International Symposium on Wireless Pervasive Computing Pub Date : 2007-04-16 DOI: 10.1109/ISWPC.2007.342676
R. Wendorf, H. Blum
{"title":"Channel-Change Games for Highly Interfering Spectrum-Agile Wireless Networks","authors":"R. Wendorf, H. Blum","doi":"10.1109/ISWPC.2007.342676","DOIUrl":"https://doi.org/10.1109/ISWPC.2007.342676","url":null,"abstract":"The proliferation of wireless networks on unlicensed communication bands leads to coexisting networks, creating interference problems. In this paper, interference problems for spectrum-agile networks are addressed by allowing the networks to dynamically change channel. For insight into dynamic channel-change strategies, we model the networks as autonomous players in a multistage non-cooperative game-theoretic model. Here the networks are assumed to be highly interfering, i.e., when two or more networks exist on a single channel they cannot successfully carry traffic. Each network seeks to minimize its time to find a clear channel. The game-theoretic analysis reflects the motivations and choices of independent, rational, selfish decision makers that do not trust one another. We analyze the game-theoretic solutions appropriate for an untrusted environment, and compare the results with socially optimal decisions that would maximize the expected benefit of all coexisting networks in a trusted environment.","PeriodicalId":403213,"journal":{"name":"2007 2nd International Symposium on Wireless Pervasive Computing","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130534469","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: 6
Repeatability of Received Signal Level Measurements in GSM Cellular Networks GSM蜂窝网络中接收信号电平测量的可重复性
2007 2nd International Symposium on Wireless Pervasive Computing Pub Date : 2007-04-16 DOI: 10.1109/ISWPC.2007.342647
N. Mijatovic, I. Kostanic
{"title":"Repeatability of Received Signal Level Measurements in GSM Cellular Networks","authors":"N. Mijatovic, I. Kostanic","doi":"10.1109/ISWPC.2007.342647","DOIUrl":"https://doi.org/10.1109/ISWPC.2007.342647","url":null,"abstract":"Received signal level (RSL) measurements are frequently used to verify coverage and ensure quality of service in cellular communication networks. To accomplish these tasks, it is of the utmost importance that these measurements are reliable and repeatable. This paper presents a repeatability study conducted on a series of RSL measurements in the GSM 1900MHz frequency band. The measurements were collected with three different drive-test systems used in common engineering practice. Data obtained from the tests are analyzed using statistical tools and the extent of the RSL measurement repeatability is determined. The analysis provides a quantitative assessment of the RSL dependence on random changes in the propagation environment. Data analysis demonstrates a significant repeatability difference between the measurement systems","PeriodicalId":403213,"journal":{"name":"2007 2nd International Symposium on Wireless Pervasive Computing","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126549908","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: 4
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