The estimation of the communication performance achievable with respect to environmental factors and configuration parameters plays a key role in the optimization process performed by a Cognitive Radio according to the original definition by Mitola [1]. In this paper we propose the use of Multilayered Feedforward Neural Networks as an effective technique for real-time characterization of the communication performance which is based on measurements carried out by the device and therefore offers some interesting learning capabilities.
{"title":"Learning and Adaptation in Cognitive Radios Using Neural Networks","authors":"N. Baldo, M. Zorzi","doi":"10.1109/CCNC08.2007.229","DOIUrl":"https://doi.org/10.1109/CCNC08.2007.229","url":null,"abstract":"The estimation of the communication performance achievable with respect to environmental factors and configuration parameters plays a key role in the optimization process performed by a Cognitive Radio according to the original definition by Mitola [1]. In this paper we propose the use of Multilayered Feedforward Neural Networks as an effective technique for real-time characterization of the communication performance which is based on measurements carried out by the device and therefore offers some interesting learning capabilities.","PeriodicalId":183858,"journal":{"name":"2008 5th IEEE Consumer Communications and Networking Conference","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115239916","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}
In this paper, we consider the internally coded time-hopping spread-time multiple access scheme introduced in. We evaluate the performance of the correlator receiver followed by the Viterbi algorithm in fading channel. We analyze the effect of multiple access interference (MAI) and narrowband interference (NBI). We also provide simulation results and further evaluate the performance of the system for the ultra wide band (UWB) application with the UWB channel model specified by the IEEE 802.15.4a group. For comparison, we consider the conventional ST-CDMA system. The results indicate that our method has much better performance while it has the same bandwidth and spectral efficiency as the conventional ST-CDMA system.
{"title":"Performance Analysis of an Internally Coded Time-Hopping Spread-Time CDMA System in the Presence of Interference","authors":"M. Shayesteh, M. Nasiri-Kenari","doi":"10.1109/CCNC08.2007.102","DOIUrl":"https://doi.org/10.1109/CCNC08.2007.102","url":null,"abstract":"In this paper, we consider the internally coded time-hopping spread-time multiple access scheme introduced in. We evaluate the performance of the correlator receiver followed by the Viterbi algorithm in fading channel. We analyze the effect of multiple access interference (MAI) and narrowband interference (NBI). We also provide simulation results and further evaluate the performance of the system for the ultra wide band (UWB) application with the UWB channel model specified by the IEEE 802.15.4a group. For comparison, we consider the conventional ST-CDMA system. The results indicate that our method has much better performance while it has the same bandwidth and spectral efficiency as the conventional ST-CDMA system.","PeriodicalId":183858,"journal":{"name":"2008 5th IEEE Consumer Communications and Networking Conference","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125337340","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}
The sleep-mode operation in power management helps to increase the life of a mobile station by saving energy consumption while it increases the MAC service data unit (SDU) response delay. Due to the trade-off relationship between these two performance metrics, it is important to determine the suitable values for two operating parameters, the initial sleep interval (Tmin) and the final sleep interval (Tmax), which manipulate the sleep-mode operation in the IEEE 802.16e MAC. To reach a fuller understanding of this problem, this paper first presents the sleep-mode operation. A new power management mechanism based on the knowledge on remaining energy in a mobile subscriber station (MSS) is then proposed. Benefits of this mechanism are to reduce the MAC SDU response delay under sufficient energy and to increase the life of a station under insufficient remaining energy. An analytical model for sleep-mode operation is developed, and the proposed mechanism is validated by computer simulation.
{"title":"Remaining Energy-Aware Power Management Mechanism in the 802.16e MAC","authors":"Min-Gon Kim, Minho Kang, Jungyul Choi","doi":"10.1109/CCNC08.2007.56","DOIUrl":"https://doi.org/10.1109/CCNC08.2007.56","url":null,"abstract":"The sleep-mode operation in power management helps to increase the life of a mobile station by saving energy consumption while it increases the MAC service data unit (SDU) response delay. Due to the trade-off relationship between these two performance metrics, it is important to determine the suitable values for two operating parameters, the initial sleep interval (Tmin) and the final sleep interval (Tmax), which manipulate the sleep-mode operation in the IEEE 802.16e MAC. To reach a fuller understanding of this problem, this paper first presents the sleep-mode operation. A new power management mechanism based on the knowledge on remaining energy in a mobile subscriber station (MSS) is then proposed. Benefits of this mechanism are to reduce the MAC SDU response delay under sufficient energy and to increase the life of a station under insufficient remaining energy. An analytical model for sleep-mode operation is developed, and the proposed mechanism is validated by computer simulation.","PeriodicalId":183858,"journal":{"name":"2008 5th IEEE Consumer Communications and Networking Conference","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115559526","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}
Tanim M. Taher, Matthew J. Misurac, J. LoCicero, D. Ucci
The MicroWave Oven (MWO) is a popular appliance that acts as an unintentional interferer for 2.4 GHz IEEE 802.11 Wi-Fi communication signals. An interference mitigation technique is developed that incorporates cognitive radio paradigms allowing Wi-Fi devices to reliably transmit information while a residential MWO is operating. This technique is applied in the experimental case where Barker spread Wi-Fi signals carry data in the presence of MWO emissions. Bit error rate is evaluated to provide a performance metric for the mitigation technique.
{"title":"Microwave Oven Signal Interference Mitigation For Wi-Fi Communication Systems","authors":"Tanim M. Taher, Matthew J. Misurac, J. LoCicero, D. Ucci","doi":"10.1109/CCNC08.2007.21","DOIUrl":"https://doi.org/10.1109/CCNC08.2007.21","url":null,"abstract":"The MicroWave Oven (MWO) is a popular appliance that acts as an unintentional interferer for 2.4 GHz IEEE 802.11 Wi-Fi communication signals. An interference mitigation technique is developed that incorporates cognitive radio paradigms allowing Wi-Fi devices to reliably transmit information while a residential MWO is operating. This technique is applied in the experimental case where Barker spread Wi-Fi signals carry data in the presence of MWO emissions. Bit error rate is evaluated to provide a performance metric for the mitigation technique.","PeriodicalId":183858,"journal":{"name":"2008 5th IEEE Consumer Communications and Networking Conference","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116059560","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}
We propose the development of a broad range of exciting mobile interaction games using intermittently-connected wireless devices such as motes. As a concrete application, we describe the implementation of a random walk game, in which players each attempt to hold on to an otherwise itinerant token for as long as possible by running to evade other players in an open field. Besides obtaining the clear entertainment value, we argue that quantifying and analyzing key performance metrics recorded during the game can not only help people to evaluate player ability, but also provide some insights into adversarial behavior in both human and robotic settings. To this end, we present preliminary quantitative results and analysis for the random walk game obtained through real play evaluation.
{"title":"MIGM: Mobile Interaction Games with Motes","authors":"Yi Wang, Shyam Kapadia, B. Krishnamachari","doi":"10.1109/CCNC08.2007.186","DOIUrl":"https://doi.org/10.1109/CCNC08.2007.186","url":null,"abstract":"We propose the development of a broad range of exciting mobile interaction games using intermittently-connected wireless devices such as motes. As a concrete application, we describe the implementation of a random walk game, in which players each attempt to hold on to an otherwise itinerant token for as long as possible by running to evade other players in an open field. Besides obtaining the clear entertainment value, we argue that quantifying and analyzing key performance metrics recorded during the game can not only help people to evaluate player ability, but also provide some insights into adversarial behavior in both human and robotic settings. To this end, we present preliminary quantitative results and analysis for the random walk game obtained through real play evaluation.","PeriodicalId":183858,"journal":{"name":"2008 5th IEEE Consumer Communications and Networking Conference","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122295565","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}
Skinning existing animation frames or examples is exploited actively to find the most suitable scheme that is capable of capturing deformations from given mesh sequences. It is necessary to approximate joint transformations by a fitting algorithm that usually involves solving a large scale linear system. In this paper, we reduce the dimensions of the linear system substantially by representing example meshes as progressive decimated models. These models are reconstructed from augmented deformation sensitive decimation (ADSD) that is able to handle large deformations while maintaining connectivity relationship throughout all example meshes. We also show that skinning can be propagated to decimated models, which allows animations to be scalable to specific applications with varied requirements of qualities.
{"title":"Skinning on Progressive Decimated Models","authors":"Xian Xiao, S. H. Soon, Feng Tian","doi":"10.1109/CCNC08.2007.240","DOIUrl":"https://doi.org/10.1109/CCNC08.2007.240","url":null,"abstract":"Skinning existing animation frames or examples is exploited actively to find the most suitable scheme that is capable of capturing deformations from given mesh sequences. It is necessary to approximate joint transformations by a fitting algorithm that usually involves solving a large scale linear system. In this paper, we reduce the dimensions of the linear system substantially by representing example meshes as progressive decimated models. These models are reconstructed from augmented deformation sensitive decimation (ADSD) that is able to handle large deformations while maintaining connectivity relationship throughout all example meshes. We also show that skinning can be propagated to decimated models, which allows animations to be scalable to specific applications with varied requirements of qualities.","PeriodicalId":183858,"journal":{"name":"2008 5th IEEE Consumer Communications and Networking Conference","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128421648","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}
J. D. Bruyne, W. Joseph, L. Martens, C. Olivier, K. Haelvoet
Cable operators offer today triple-play services (internet, video, and telephony) to their customers over Hybrid Fiber/Coax (HFC) networks. As the bandwidth in such an HFC network is shared by a service group of 2000 homes or less, and as the demand for bandwidth for the triple-play services heavily increases, redesign of this network may be needed to enhance the bandwidth per customer. In this short paper, two heuristic methods for reducing the number of homes per service group by moving the fiber closer to the homes at minimum cost are presented. These heuristic methods are investigated for three different areas: urban, suburban, and rural environments. The preliminary results show that nearly equal results are obtained for both heuristic methods and that the highest investment costs are generally obtained for rural areas.
{"title":"Cost-Efficient Node Splitting of Hybrid Fiber/Coax Networks Using Two Heuristic Techniques","authors":"J. D. Bruyne, W. Joseph, L. Martens, C. Olivier, K. Haelvoet","doi":"10.1109/CCNC08.2007.195","DOIUrl":"https://doi.org/10.1109/CCNC08.2007.195","url":null,"abstract":"Cable operators offer today triple-play services (internet, video, and telephony) to their customers over Hybrid Fiber/Coax (HFC) networks. As the bandwidth in such an HFC network is shared by a service group of 2000 homes or less, and as the demand for bandwidth for the triple-play services heavily increases, redesign of this network may be needed to enhance the bandwidth per customer. In this short paper, two heuristic methods for reducing the number of homes per service group by moving the fiber closer to the homes at minimum cost are presented. These heuristic methods are investigated for three different areas: urban, suburban, and rural environments. The preliminary results show that nearly equal results are obtained for both heuristic methods and that the highest investment costs are generally obtained for rural areas.","PeriodicalId":183858,"journal":{"name":"2008 5th IEEE Consumer Communications and Networking Conference","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124762760","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}
OFDM is facing great opportunities and challenges in current broadband communication era. These opportunities and challenges derive from the native advantages and disadvantages of OFDM technology respectively. Too high PAPR is one of the main problems that prevent OFDM from being used more generally in broadband systems. Many approaches such as clipping and filtering, coding, SLM, PTS, and tone reservation have been studied to reduce the peak magnitude of OFDM symbols. In these approaches, tone reservation is considered as one of the most promising methods because of no additional distortion, no side information, and low implementation cost. In this paper, a novel tone reservation scheme is presented. Its essential idea is that a subcarrier selected from all reserved subcarriers for PAPR reduction should have a phase close to one of phi, pi/2+phi, pi+phi and -pi/2+phi, at the peak location in time domain, where phi is the phase of the peak sample. This results in no complex multiplication and division in the novel scheme. In addition, the floating positions of such selected subcarriers in frequency domain are helpful to the convergence of the algorithm. The simulation results show that the scheme can provide good performance and fast convergence.
{"title":"A Novel Tone Reservation Scheme with Fast Convergence for PAPR Reduction in OFDM Systems","authors":"Yuzhong Jiao, Xuejiao Liu, Xin'an Wang","doi":"10.1109/CCNC08.2007.95","DOIUrl":"https://doi.org/10.1109/CCNC08.2007.95","url":null,"abstract":"OFDM is facing great opportunities and challenges in current broadband communication era. These opportunities and challenges derive from the native advantages and disadvantages of OFDM technology respectively. Too high PAPR is one of the main problems that prevent OFDM from being used more generally in broadband systems. Many approaches such as clipping and filtering, coding, SLM, PTS, and tone reservation have been studied to reduce the peak magnitude of OFDM symbols. In these approaches, tone reservation is considered as one of the most promising methods because of no additional distortion, no side information, and low implementation cost. In this paper, a novel tone reservation scheme is presented. Its essential idea is that a subcarrier selected from all reserved subcarriers for PAPR reduction should have a phase close to one of phi, pi/2+phi, pi+phi and -pi/2+phi, at the peak location in time domain, where phi is the phase of the peak sample. This results in no complex multiplication and division in the novel scheme. In addition, the floating positions of such selected subcarriers in frequency domain are helpful to the convergence of the algorithm. The simulation results show that the scheme can provide good performance and fast convergence.","PeriodicalId":183858,"journal":{"name":"2008 5th IEEE Consumer Communications and Networking Conference","volume":"276 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129593580","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}
C. Escoffier, Johann Bourcier, P. Lalanda, Jianqi Yu
The emergence of smart devices, especially in the home context, will change the way we interact with our environment. However, implementing and maintaining home-control applications is still far from easy. This paper discusses the difficulties encountered during the development of a home gateway. It then introduces a framework that sets the basics of a home application server and allows an easy development of home applications. An implementation is subsequently presented to validate the approach and its benefits.
{"title":"Towards a Home Application Server","authors":"C. Escoffier, Johann Bourcier, P. Lalanda, Jianqi Yu","doi":"10.1109/CCNC08.2007.78","DOIUrl":"https://doi.org/10.1109/CCNC08.2007.78","url":null,"abstract":"The emergence of smart devices, especially in the home context, will change the way we interact with our environment. However, implementing and maintaining home-control applications is still far from easy. This paper discusses the difficulties encountered during the development of a home gateway. It then introduces a framework that sets the basics of a home application server and allows an easy development of home applications. An implementation is subsequently presented to validate the approach and its benefits.","PeriodicalId":183858,"journal":{"name":"2008 5th IEEE Consumer Communications and Networking Conference","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123939846","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}
Multiuser detectors suffer from their relatively higher computational complexity that prevents widespread use of this technique. In addition, one of the main characteristics of multichannel communications that can severely degrade the performance is the inconsistent values of processing gain (PG) that result in high multiple access interference (MAI). However, if we could lower the complexity of multiuser detectors and produce better values of PG, most of the CDMA systems would likely take advantage of this technique in terms of increased system capacity and a better data rate .This paper presents a deterministic formalization of the PG for a wireless multi-channel DS-CDMA system The proposed deterministic formalization demonstrates that how the reduced BER could be used to achieve reasonable values of PG by which unwanted signals can be suppressed relative to the desired signal at the receiving end. The performance measure adopted in this paper is the achievable bit rate for a fixed probability of error (10-7).
{"title":"Deterministic Formalization of the Processing Gain for Reducing MAI in Multi-Channel Communications System","authors":"S. Rizvi, K. Elleithy, A. Riasat","doi":"10.1109/CCNC08.2007.200","DOIUrl":"https://doi.org/10.1109/CCNC08.2007.200","url":null,"abstract":"Multiuser detectors suffer from their relatively higher computational complexity that prevents widespread use of this technique. In addition, one of the main characteristics of multichannel communications that can severely degrade the performance is the inconsistent values of processing gain (PG) that result in high multiple access interference (MAI). However, if we could lower the complexity of multiuser detectors and produce better values of PG, most of the CDMA systems would likely take advantage of this technique in terms of increased system capacity and a better data rate .This paper presents a deterministic formalization of the PG for a wireless multi-channel DS-CDMA system The proposed deterministic formalization demonstrates that how the reduced BER could be used to achieve reasonable values of PG by which unwanted signals can be suppressed relative to the desired signal at the receiving end. The performance measure adopted in this paper is the achievable bit rate for a fixed probability of error (10-7).","PeriodicalId":183858,"journal":{"name":"2008 5th IEEE Consumer Communications and Networking Conference","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123999580","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}
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