2009 First UK-India International Workshop on Cognitive Wireless Systems (UKIWCWS)最新文献

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Unequal error protection based LV segmented CMR image transmission through wireless communication channels 基于不等错误保护的低压分割CMR图像无线通信传输
2009 First UK-India International Workshop on Cognitive Wireless Systems (UKIWCWS) Pub Date : 2009-12-01 DOI: 10.1109/UKIWCWS.2009.5749429
S. Dakua, J. Sahambi
{"title":"Unequal error protection based LV segmented CMR image transmission through wireless communication channels","authors":"S. Dakua, J. Sahambi","doi":"10.1109/UKIWCWS.2009.5749429","DOIUrl":"https://doi.org/10.1109/UKIWCWS.2009.5749429","url":null,"abstract":"Increasing life expectation have made the heart failures of important concern. For clinical diagnosis, parameters for the condition of heart are needed. Estimation of these parameters is possible from accurate segmented cardiac magnetic resonance (CMR) images. For real time applications, reliable transmission of these segmented medical images through wireless communication channels faces a great challenge. Wireless channels impairments such as fading and interference increase the probability errors, when the image is transmitted. This necessitates the use of channel coding to protect against the channel errors. The problem of increase in transmitted bit rate with the application of general channel coding is solved by the unequal error protection technique. As we concentrate on the left ventricle (LV), more importance is given to this as compared to rest part of the CMR image. In this paper, we suggest a technique that emphasizes protection according to the importance. The image is partitioned into equal blocks and the data classification is performed in the DWT domain. The DWT coefficients are categorized into two classes of importance and they are given different rates of error protection and compression ratios. The simulation results show the less bit error rate for the left ventricular image indicating high quality desired reconstructed image at the receiver end.","PeriodicalId":198556,"journal":{"name":"2009 First UK-India International Workshop on Cognitive Wireless Systems (UKIWCWS)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125536522","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
Performance analysis for cooperative relay with power control scheme over fading channel 衰落信道下功率控制协同中继性能分析
2009 First UK-India International Workshop on Cognitive Wireless Systems (UKIWCWS) Pub Date : 2009-12-01 DOI: 10.1109/UKIWCWS.2009.5749418
A. Zamani, R. Rashid, S. Yusof, N. Fisal
{"title":"Performance analysis for cooperative relay with power control scheme over fading channel","authors":"A. Zamani, R. Rashid, S. Yusof, N. Fisal","doi":"10.1109/UKIWCWS.2009.5749418","DOIUrl":"https://doi.org/10.1109/UKIWCWS.2009.5749418","url":null,"abstract":"Performance of a system is determined by the probability of error of the channel. In this paper, the error probability of cooperative relay channel is analyzed for Quadrature Phase Shift Keying (QPSK) using simple linear block coding. Focusing on a network with single source to destination with one relay station, the upper bound of symbol error rate (SER) is derived. A power control scheme is also proposed to improve the performance of the system. Computer simulations confirm the presented mathematical analysis.","PeriodicalId":198556,"journal":{"name":"2009 First UK-India International Workshop on Cognitive Wireless Systems (UKIWCWS)","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127852988","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
Preventing the transmission of harmful cognitive radio users in the presence of primary users 在主要用户在场的情况下,防止有害认知无线电用户的传播
2009 First UK-India International Workshop on Cognitive Wireless Systems (UKIWCWS) Pub Date : 2009-12-01 DOI: 10.1109/UKIWCWS.2009.5749422
Mona Fathollahi, M. Soleimanipour
{"title":"Preventing the transmission of harmful cognitive radio users in the presence of primary users","authors":"Mona Fathollahi, M. Soleimanipour","doi":"10.1109/UKIWCWS.2009.5749422","DOIUrl":"https://doi.org/10.1109/UKIWCWS.2009.5749422","url":null,"abstract":"A cognitive radio provides access to a licensed spectrum for unlicensed users opportunistically provided that they are not harmful for licensed users (primary users). We call a cognitive radio user (CR user) harmful, when it generates interference for primary users (PU) or occupies spectrum holes excessively. This paper discusses the spectrum management policy against harmful CR users. For this, we design a jammer signal which ruins transmission of harmful CR users and forces them to leave the spectrum without damaging the communication of PUs. This signal is designed using group subspace technique for both synchronous and asynchronous channels. Our simulation results show that the designed jammer signal generates effective interference to harmful CR user while maintains performance of PUs.","PeriodicalId":198556,"journal":{"name":"2009 First UK-India International Workshop on Cognitive Wireless Systems (UKIWCWS)","volume":"883 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126095970","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
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