Electronics and Communications in Japan (Part I: Communications)最新文献_第2页

Proposed high‐efficiency packet forwarding method under multihome environment 提出了多家庭环境下的高效分组转发方法

Electronics and Communications in Japan (Part I: Communications) Pub Date : 2007-10-01 DOI: 10.1002/ECJA.20368

H. Shiota, A. Otaka, T. Nakashima, Y. Okumura

引用次数: 0

New weighting method to synthesize a zero sidelobe correlation filter for burst signals 一种针对突发信号合成零旁瓣相关滤波器的加权新方法

Electronics and Communications in Japan (Part I: Communications) Pub Date : 2007-10-01 DOI: 10.1002/ECJA.20373

Mitsuyoshi Shinonaga, J. Suzuki, Shinichi Yajima, S. Nishimoto

{"title":"New weighting method to synthesize a zero sidelobe correlation filter for burst signals","authors":"Mitsuyoshi Shinonaga, J. Suzuki, Shinichi Yajima, S. Nishimoto","doi":"10.1002/ECJA.20373","DOIUrl":"https://doi.org/10.1002/ECJA.20373","url":null,"abstract":"The detection of received radar signals uses Doppler filtering as the correlation process on the received echoes for many transmitted pulses in addition to the pulse compression process which is the correlation process in the range direction. Normal radar echoes become blips widened in the azimuth direction, but the Doppler filtering process is not the optimum process from the perspective of improving the signal-to-noise ratio. Furthermore, compression of the spread in the azimuth direction of the signal is demanded in order to detect the azimuth. In this paper, we show that the azimuth beam width compression process can be implemented by filtering which satisfies the maximum SNR based on the zero sidelobe constraint condition applied to pulse compression. In addition, we theoretically explain the weighting matrix derived by this design method and use simulations to compare with the pulse compression process of the characteristics of a zero sidelobe correlation function. © 2007 Wiley Periodicals, Inc. Electron Comm Jpn Pt 1, 90(10): 25– 35, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/ecja.20373","PeriodicalId":100405,"journal":{"name":"Electronics and Communications in Japan (Part I: Communications)","volume":"5 1","pages":"25-35"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90373840","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

Transmission performance of WDM/OFDM hybrid systems over optical fibers 光纤上WDM/OFDM混合系统的传输性能

Electronics and Communications in Japan (Part I: Communications) Pub Date : 2007-10-01 DOI: 10.1002/ECJA.20387

Kenichiro Tanaka, S. Norimatsu

引用次数: 6

A decoding method for Tornado‐type codes utilizing error packets 一种利用错误包解码龙卷风型代码的方法

Electronics and Communications in Japan (Part I: Communications) Pub Date : 2007-10-01 DOI: 10.1002/ECJA.20361

Ryohei Yamato, D. Umehara, Y. Morihiro, Taku Noguchi, M. Kawai

{"title":"A decoding method for Tornado‐type codes utilizing error packets","authors":"Ryohei Yamato, D. Umehara, Y. Morihiro, Taku Noguchi, M. Kawai","doi":"10.1002/ECJA.20361","DOIUrl":"https://doi.org/10.1002/ECJA.20361","url":null,"abstract":"Satellite communications is suitable for multicast communications which can achieve one-to-many delivery because it can broadcast to multiple receiving stations over a wide area. However, packet retransmission is inefficient for satellite communications because of its large delay and bit error rate. In order to avoid packet retransmission, FEC (forward error correction) exploiting error correcting codes have been put to practical use in satellite multicasting. Tornado-type codes are well known as a kind of error correcting codes suitable for multicasting. Tornado-type codes are encoded and decoded in packets. As a result, they are effective for combatting packet losses by buffer overflow or congestion control. Furthermore, their coding and decoding have low time complexity. On the other hand, the bit errors in the packet are processed as a packet loss in decoding because the Tornado-type codes are decoded packet-wise. In this paper, we propose an effective decoding method for bit errors in the packets for Tornado-type codes. We show by computer simulation that the proposed method is effective in bit error environments. © 2007 Wiley Periodicals, Inc. Electron Comm Jpn Pt 1, 90(10): 57– 66, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/ecja.20361","PeriodicalId":100405,"journal":{"name":"Electronics and Communications in Japan (Part I: Communications)","volume":"4 5 1","pages":"57-66"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82839202","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

Replica distribution of data associated with location on wireless ad hoc networks 无线自组织网络上与位置相关的数据的副本分布

Electronics and Communications in Japan (Part I: Communications) Pub Date : 2007-10-01 DOI: 10.1002/ECJA.20320

G. Tsuchida, Tomoyuki Okino, Masahiro Tamori, Takashi Watanabe, T. Mizuno, S. Ishihara

{"title":"Replica distribution of data associated with location on wireless ad hoc networks","authors":"G. Tsuchida, Tomoyuki Okino, Masahiro Tamori, Takashi Watanabe, T. Mizuno, S. Ishihara","doi":"10.1002/ECJA.20320","DOIUrl":"https://doi.org/10.1002/ECJA.20320","url":null,"abstract":"In mobile ad hoc networks, due to the change of topology caused by the movement of hosts and the change of radio link status, it is difficult for mobile hosts to retain accessibility to data on other hosts. To solve such a problem, replica distribution methods which distribute replicas of data items to other mobile hosts and maintain them have been proposed. In this paper, we propose and evaluate a method to enhance the accessibility to data items that are associated with locations and requested by Geocast from hosts. This method is based on flooding of replicas of data items, and it uses the locations of mobile hosts and the associated locations of data items for controlling the range of the replications and the redundancy of the replicas. Furthermore, to keep the accessibility to such data high, replicas are dynamically relocated after the movement of hosts. We confirmed the effectiveness of the proposed method by detailed simulations including multiple data request models. Simulation results showed that the proposed method achieves high accessibility to location-dependent data especially when the storage size is small. © 2007 Wiley Periodicals, Inc. Electron Comm Jpn Pt 1, 90(10): 67– 80, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/ecja.20320","PeriodicalId":100405,"journal":{"name":"Electronics and Communications in Japan (Part I: Communications)","volume":"58 1","pages":"67-80"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82610565","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

Characteristics of a buck converter with new control scheme using a triangle waveform modulated by output voltage 用输出电压调制的三角形波形控制降压变换器的特性

Electronics and Communications in Japan (Part I: Communications) Pub Date : 2007-07-01 DOI: 10.1002/ECJA.20256

Jinbin Zhao, Terukazu Sato, T. Nabeshima, T. Nakano

引用次数: 8

Stress dependence of transmission frequency of a fiber Fabry‐Perot etalon buried in a fiber ferrule 埋在光纤插套中的法布里-珀罗标准子传输频率的应力依赖性

Electronics and Communications in Japan (Part I: Communications) Pub Date : 2007-07-01 DOI: 10.1002/ECJA.20386

M. Tateda, K. Komaki, Yuki Yamaguchi

引用次数: 1

A study of the application of mobile IP to IP‐VPN and the development of mobile foreign agent 移动IP在IP - VPN中的应用研究及移动外接代理的开发

Electronics and Communications in Japan (Part I: Communications) Pub Date : 2007-07-01 DOI: 10.1002/ECJA.20385

H. Hata

引用次数: 0

Stability design for on‐board distributed power system 车载分布式电力系统的稳定性设计

Electronics and Communications in Japan (Part I: Communications) Pub Date : 2007-07-01 DOI: 10.1002/ECJA.20356

S. Abe, M. Hirokawa, T. Zaitsu, T. Ninomiya

{"title":"Stability design for on‐board distributed power system","authors":"S. Abe, M. Hirokawa, T. Zaitsu, T. Ninomiya","doi":"10.1002/ECJA.20356","DOIUrl":"https://doi.org/10.1002/ECJA.20356","url":null,"abstract":"Recently, on-board distributed power systems consisting of bus converter and POL have usually been used for IT infrastructure equipment. However, even if each converter has stable operation, the bus voltage may oscillate and the system may be unstable, depending on the bus converter design; this has been a serious problem in recent years. Solution of the issue is highly desirable, and in order to improve the system stability various techniques have been discussed. This paper investigates the improvement of the system stability by the control method. The availability of full-regulated bus converter is especially examined. It is determined that the full-regulated method is the optimal control method for the bus converter because a full-regulated bus converter can reduce bus voltage oscillation and adjust to input voltage variations flexibly by regulation. A stability design process is proposed for an on-board distributed power system using a full-regulated bus converter. © 2007 Wiley Periodicals, Inc. Electron Comm Jpn Pt 1, 90(7): 18–25, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/ecja.20356","PeriodicalId":100405,"journal":{"name":"Electronics and Communications in Japan (Part I: Communications)","volume":"8 1","pages":"18-25"},"PeriodicalIF":0.0,"publicationDate":"2007-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80181844","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

A delta representation scheme for updating between versions of mobile phone software 用于在手机软件版本之间进行更新的增量表示方案

Electronics and Communications in Japan (Part I: Communications) Pub Date : 2007-07-01 DOI: 10.1002/ECJA.20348

R. Kiyohara, Mariko Kurihara, S. Mii, S. Kino

{"title":"A delta representation scheme for updating between versions of mobile phone software","authors":"R. Kiyohara, Mariko Kurihara, S. Mii, S. Kino","doi":"10.1002/ECJA.20348","DOIUrl":"https://doi.org/10.1002/ECJA.20348","url":null,"abstract":"In recent years the amount of software running on mobile phones has increased dramatically due to the start of data network connection services for mobile phones. As a result it has sometimes become necessary to repair defects in such products after they have been shipped to market. In this context, services have been launched that enable software to be updated after a terminal has been sold. The time taken for software to be updated is made up of the time taken to transmit the data to the handset via a mobile network or from a PC (which in turn depends on the amount of data being transmitted) and the time taken to overwrite the data on flash memory. A standard method for making the amount of data that needs to be transmitted to the handset small, is to only send delta data corresponding to those parts of the new version of the software that differ from the old version; it is generally necessary to make this delta as small as possible. Following a description of existing techniques for extracting deltas, in this paper we make multiple proposals regarding delta extraction schemes that are designed with the structure of mobile phone software particularly in mind with a view to making the delta data transmitted to the handset when updating software as small as possible; we then describe results of evaluations with actual mobile phones immediately prior to shipping. Both of the schemes that we propose are shown to allow a reduction of approximately 30 percent in the size of the delta when compared with standard delta representation mechanisms. © 2007 Wiley Periodicals, Inc. Electron Comm Jpn Pt 1, 90(7): 26–37, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/ecja.20348","PeriodicalId":100405,"journal":{"name":"Electronics and Communications in Japan (Part I: Communications)","volume":"26 1","pages":"26-37"},"PeriodicalIF":0.0,"publicationDate":"2007-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78889358","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: 10