{"title":"Time-compression overlap add: Description and implementation","authors":"Stephen T. Harrison, P. Driessen","doi":"10.1109/PACRIM.2015.7334810","DOIUrl":"https://doi.org/10.1109/PACRIM.2015.7334810","url":null,"abstract":"The mathematical theory of the time-compression overlap add scheme for radio communications is presented. A simple time-shifting model is developed to explore performance in AWGN and multipath Rayleigh fading channels. Equivalent multirate filter structures for both the transmit and receive processes are developed and used to analyze the spectrum of the transmitted signal as it relates to the spectrum of the message signal.","PeriodicalId":350052,"journal":{"name":"2015 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing (PACRIM)","volume":"100 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126593091","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}
{"title":"A novel progressive lossy-to-lossless coding method for mesh models of images","authors":"Xiao Feng, M. Adams","doi":"10.1109/PACRIM.2015.7334820","DOIUrl":"https://doi.org/10.1109/PACRIM.2015.7334820","url":null,"abstract":"A novel progressive lossy-to-lossless coding method is proposed for mesh models of images whose underlying triangulations have arbitrary connectivity. For a triangulation T of a set P of points, our proposed method represents the connectivity of T as a sequence of edge flips that maps a uniquely-determined Delaunay triangulation of P to T. The coding efficiency of our method is highest when the underlying triangulation connectivity is close to Delaunay, and slowly degrades as connectivity moves away from being Delaunay. Experimental results show our method to significantly outperform a simple baseline coding scheme and suggest our method to be superior to more traditional coding approaches for meshes whose connectivity does not deviate too far from being Delaunay.","PeriodicalId":350052,"journal":{"name":"2015 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing (PACRIM)","volume":"37 5","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133077454","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}
{"title":"Optimal visualization design for electromagnetic environment situation of the sea","authors":"Chao Gao, Qixun Zhang, Baocong Wang","doi":"10.1109/PACRIM.2015.7334823","DOIUrl":"https://doi.org/10.1109/PACRIM.2015.7334823","url":null,"abstract":"Due to the ubiquity of wireless communication systems, electromagnetic environment over the sea has become more and more complex, which leads to the urgent demand on the cognition of electromagnetic environment and the accurate illustration of electromagnetic situation. In this paper, an optimal methodology to calculate the electromagnetic spatial energy distribution over the sea has been proposed. Based on the computation results, the electromagnetic environment situation map has been generated to illustrate the electromagnetic energy distribution over the sea under observation. According to the real-time information of equipment provided by database, the visualization work can be accomplished promptly to provide valuable information for potential interference discovery and decision making over the sea. In addition, an approach for spectrum management and distribution has also been proposed to discover vacant frequency band, which can improve the efficiency of spectrum utilization.","PeriodicalId":350052,"journal":{"name":"2015 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing (PACRIM)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125221127","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}
{"title":"Energy bugs in mobile devices: A survey","authors":"Amine Demidem, H. Elmiligi, F. Gebali","doi":"10.1109/PACRIM.2015.7334890","DOIUrl":"https://doi.org/10.1109/PACRIM.2015.7334890","url":null,"abstract":"Portable electronic devices, such as smartphones and tables, have become the most popular computing devices for end users. The portability, flexibility, and powerful hardware support make it easy to execute complex computation on a smartphone or process video applications on a tablet in a very efficient manner. However, users of these mobile devices are now facing problems with poor battery life. In this paper, we conduct a survey to explore the possible reasons behind battery drains in portable electronic devices. We also analyze energy bugs based on various criteria. This paper provides a comprehensive survey of energy bugs in mobile devices, which is an important step to help hardware designers and application developers eliminate energy bugs in hardware platforms and mobile applications.","PeriodicalId":350052,"journal":{"name":"2015 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing (PACRIM)","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126663824","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}
M. Mitsuishi, Daiki Nobayashi, T. Ikenaga, Y. Oie, H. Ishinishi, Akira Nagata, Katsuichi Nakamura
{"title":"On demand routing scheme for real-spatial information based group communication","authors":"M. Mitsuishi, Daiki Nobayashi, T. Ikenaga, Y. Oie, H. Ishinishi, Akira Nagata, Katsuichi Nakamura","doi":"10.1109/PACRIM.2015.7334860","DOIUrl":"https://doi.org/10.1109/PACRIM.2015.7334860","url":null,"abstract":"Widespread high-performance mobile stations and wireless communication technologies make it possible to enjoy various network services anywhere at any time. In particular, social network services (SNSs) provide a wide variety of communication among users. We aim to achieve real-space communication that directly integrates information exchange and real-space activity in our daily lives. Therefore, we develop three subsystems: (i) gathering personal and location information of users, (ii) managing huge quantities of user information and creating a group of users on a request basis, and (iii) delivering a message for all users in a requested group. In this paper, we focus on the third subsystem, especially in a combinational configuration of wide-area wireless networks (WiMAX, LTE, and so on) and device-to-device (ad hoc) communication with WLANs. We assume that some users who should receive a message cannot use wide-area wireless networks due their inaccessible communication range or the occurrence of a disaster, and that supplemental device-to-device WLAN communication covers such users. Although multicast communication can provide effective message delivery to users in a group, the overhead increases with the increased number of messages multicast to many users and groups. We propose an on-demand routing scheme for group communication based on a real-spatial information system and evaluate the efficiency of the proposed scheme by a simulation.","PeriodicalId":350052,"journal":{"name":"2015 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing (PACRIM)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133829677","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}