Pub Date : 2010-11-01DOI: 10.1109/ISABEL.2010.5702764
Ahmed A. Naguib, A. Elezabi, M. Nafie
In this paper, we investigate the benefits of using cooperative relays in interweave (opportunistic) cognitive radio systems. A novel distributed space frequency (DSF) code for relay cooperation is presented. The code is designed to be a multi-user multi-OFDM channels code. It achieves a cooperative diversity gain of order NL for all users, where N is the number of relays and L is the number of paths in the multi-path fading channel. Simulation results show that using this DSF code by relays in the proposed system significantly increases system throughput. This code depends on transmitting the signal of each secondary user on a number of channels. Hence, each source will be less sensitive to spatial and temporal variations in channels availability which is one of the main problems in interweave cognitive radio systems.
{"title":"A novel scheme for relay cooperation in interweave cognitive radio systems","authors":"Ahmed A. Naguib, A. Elezabi, M. Nafie","doi":"10.1109/ISABEL.2010.5702764","DOIUrl":"https://doi.org/10.1109/ISABEL.2010.5702764","url":null,"abstract":"In this paper, we investigate the benefits of using cooperative relays in interweave (opportunistic) cognitive radio systems. A novel distributed space frequency (DSF) code for relay cooperation is presented. The code is designed to be a multi-user multi-OFDM channels code. It achieves a cooperative diversity gain of order NL for all users, where N is the number of relays and L is the number of paths in the multi-path fading channel. Simulation results show that using this DSF code by relays in the proposed system significantly increases system throughput. This code depends on transmitting the signal of each secondary user on a number of channels. Hence, each source will be less sensitive to spatial and temporal variations in channels availability which is one of the main problems in interweave cognitive radio systems.","PeriodicalId":165367,"journal":{"name":"2010 3rd International Symposium on Applied Sciences in Biomedical and Communication Technologies (ISABEL 2010)","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131507065","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}
Pub Date : 2010-11-01DOI: 10.1109/ISABEL.2010.5702878
A. Mencattini, G. Rabottino, M. Salmeri, R. Lojacono
Microcalcifications clusters are subtle signs of breast cancer and are very difficult to diagnose in the mammographic images because of their small size and low contrast with respect to the normal breast tissue. In this paper, we propose an automatic procedure for the identification of microcalcifications clusters to aid the radiologist in the detection of this kind of breast cancer signs.
{"title":"A filtering-based procedure for the microcalcifications detection in mammograms","authors":"A. Mencattini, G. Rabottino, M. Salmeri, R. Lojacono","doi":"10.1109/ISABEL.2010.5702878","DOIUrl":"https://doi.org/10.1109/ISABEL.2010.5702878","url":null,"abstract":"Microcalcifications clusters are subtle signs of breast cancer and are very difficult to diagnose in the mammographic images because of their small size and low contrast with respect to the normal breast tissue. In this paper, we propose an automatic procedure for the identification of microcalcifications clusters to aid the radiologist in the detection of this kind of breast cancer signs.","PeriodicalId":165367,"journal":{"name":"2010 3rd International Symposium on Applied Sciences in Biomedical and Communication Technologies (ISABEL 2010)","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133767507","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}
Pub Date : 2010-11-01DOI: 10.1109/ISABEL.2010.5702774
Wael Guibène, A. Hayar
In this paper1, we propose a new concept of spectrum sensing techniques based on a joint time-frequency detection of primary users. In this new approach, we aim at detecting the presence of the PU in frequency and in time as well. The proposed technique based on an algebraic detection of the spectrum is compared to one of the most well known tool in time frequency analysis tools: the Wigner Ville Distribution. Simulation results show how reliable the proposed technique is comparing to classical energy detection in time-frequency plane.
{"title":"Joint time-frequency spectrum sensing for Cognitive Radio","authors":"Wael Guibène, A. Hayar","doi":"10.1109/ISABEL.2010.5702774","DOIUrl":"https://doi.org/10.1109/ISABEL.2010.5702774","url":null,"abstract":"In this paper1, we propose a new concept of spectrum sensing techniques based on a joint time-frequency detection of primary users. In this new approach, we aim at detecting the presence of the PU in frequency and in time as well. The proposed technique based on an algebraic detection of the spectrum is compared to one of the most well known tool in time frequency analysis tools: the Wigner Ville Distribution. Simulation results show how reliable the proposed technique is comparing to classical energy detection in time-frequency plane.","PeriodicalId":165367,"journal":{"name":"2010 3rd International Symposium on Applied Sciences in Biomedical and Communication Technologies (ISABEL 2010)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128899266","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}
Pub Date : 2010-11-01DOI: 10.1109/ISABEL.2010.5702933
Georgios Kardaras, L. Dittmann, José Soler
Increasing the efficiency of mobile communication networks while keeping operational and maintenance cost at reasonable level is a major task for operators. Multimode radios capable of operating according to various mobile broadband standards, such as WCDMA, WiMAX and LTE, represent the new trend for resolving these challenges. A transparent radio solution, agnostic to wireless standards, with high capacity and low power consumption is the overall target. Regulating power consumption for radio modules can be achieved by introducing linearization methods for power amplifiers. This paper presents a simplified approach using polynomial digital predistortion in the intermediated frequency (IF) domain. It is fully implementable in software and no hardware changes are required on the digital or analog platform. The adaptation algorithm selected was Least Mean Squares because of its relevant simplicity compared to more sophisticated adaptation algorithms, which are expensive in FPGA hardware resources. Simulation results show improvement of Adjacent Channel Power Ratio (ACPR) over 20dB by reducing the 3rd and 5th order intermodulation products providing compliance to the strict spectrum mask requirements. In the mean time, the Error Vector Magnitude (EVM) is maintained below 2% meeting the requirements for WiMAX and LTE wireless standards.
{"title":"Simplified polynomial digital predistortion for multimode software defined radios","authors":"Georgios Kardaras, L. Dittmann, José Soler","doi":"10.1109/ISABEL.2010.5702933","DOIUrl":"https://doi.org/10.1109/ISABEL.2010.5702933","url":null,"abstract":"Increasing the efficiency of mobile communication networks while keeping operational and maintenance cost at reasonable level is a major task for operators. Multimode radios capable of operating according to various mobile broadband standards, such as WCDMA, WiMAX and LTE, represent the new trend for resolving these challenges. A transparent radio solution, agnostic to wireless standards, with high capacity and low power consumption is the overall target. Regulating power consumption for radio modules can be achieved by introducing linearization methods for power amplifiers. This paper presents a simplified approach using polynomial digital predistortion in the intermediated frequency (IF) domain. It is fully implementable in software and no hardware changes are required on the digital or analog platform. The adaptation algorithm selected was Least Mean Squares because of its relevant simplicity compared to more sophisticated adaptation algorithms, which are expensive in FPGA hardware resources. Simulation results show improvement of Adjacent Channel Power Ratio (ACPR) over 20dB by reducing the 3rd and 5th order intermodulation products providing compliance to the strict spectrum mask requirements. In the mean time, the Error Vector Magnitude (EVM) is maintained below 2% meeting the requirements for WiMAX and LTE wireless standards.","PeriodicalId":165367,"journal":{"name":"2010 3rd International Symposium on Applied Sciences in Biomedical and Communication Technologies (ISABEL 2010)","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132517968","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}
Pub Date : 2010-11-01DOI: 10.1109/ISABEL.2010.5702794
Wenbo Wang, Andres Kwasinski
In dynamic spectrum access networks, spectrum sensing plays a key role in determining the reliability and efficiency of opportunistic spectrum utilization. However, when treating the transmission over a licensed bandwidth as a black box, most energy detection-based sensing methods lack the ability of adapting the sensor to the changes in channel condition. This paper introduces a feedback mechanism into the cooperative sensing framework for estimating the channel SNR and adapting the detector's parameters. The feedback mechanism provides information to local nodes that is used to dynamically control the decision threshold and maintain a stable performance level when channel condition changes. In this framework, the problem of balancing the channel detection opportunity and the interference risk is formulated by an optimization procedure based on a proposed weighted cost function. A queuing model of the primary user activity is employed to predict the channel state and assist grouping the detection samples for estimating the channel characteristics. Such an estimation mechanism requires no complex design and little a priori knowledge of the primary network. Simulation results show that the cooperative scheme improve performance from local decisions and that the introduction of a feedback mechanism results in a notable performance improvement over all schemes.
{"title":"Feedback-based cooperative primary channel activity estimation for dynamic spectrum access","authors":"Wenbo Wang, Andres Kwasinski","doi":"10.1109/ISABEL.2010.5702794","DOIUrl":"https://doi.org/10.1109/ISABEL.2010.5702794","url":null,"abstract":"In dynamic spectrum access networks, spectrum sensing plays a key role in determining the reliability and efficiency of opportunistic spectrum utilization. However, when treating the transmission over a licensed bandwidth as a black box, most energy detection-based sensing methods lack the ability of adapting the sensor to the changes in channel condition. This paper introduces a feedback mechanism into the cooperative sensing framework for estimating the channel SNR and adapting the detector's parameters. The feedback mechanism provides information to local nodes that is used to dynamically control the decision threshold and maintain a stable performance level when channel condition changes. In this framework, the problem of balancing the channel detection opportunity and the interference risk is formulated by an optimization procedure based on a proposed weighted cost function. A queuing model of the primary user activity is employed to predict the channel state and assist grouping the detection samples for estimating the channel characteristics. Such an estimation mechanism requires no complex design and little a priori knowledge of the primary network. Simulation results show that the cooperative scheme improve performance from local decisions and that the introduction of a feedback mechanism results in a notable performance improvement over all schemes.","PeriodicalId":165367,"journal":{"name":"2010 3rd International Symposium on Applied Sciences in Biomedical and Communication Technologies (ISABEL 2010)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116451158","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}
Pub Date : 2010-11-01DOI: 10.1109/ISABEL.2010.5702841
Z. Bai, C. Spiegel, G. Bruck, P. Jung, Michael Horvat, J. Berkmann, C. Drewes, B. Gunzelmann
Recently, the LTE (Long Term Evolution) and LTE-Advanced systems, developed by the 3GPP (Third Generation Partnership Project), has been proposed as the candidate for the 4G systems (forth mobile communication systems). The combination of OFDM (orthogonal frequency division multiplexing) and MIMO (multiple-input multiple-output) transmission technologies has been introduced into LTE systems for achieving high system performance required by 4G systems. Furthermore, the closed-loop concept with codebook based precoding MIMO and dynamic transmission mode selection, termed as RI (rank indicator) selection, have also been deployed in LTE systems to provide robust link connection and large cell coverage. In this manuscript, the authors focused on the study of dynamic transmission mode selection and its implementation in LTE systems. Different RI selection schemes were proposed in this manuscript with the corresponding downlink performance evaluation. According to the analytical and numerical results, the authors conclude that the mutual information based scheme is the best candidate for RI selection in LTE/LTE-Advanced compliant systems.
{"title":"Dynamic transmission mode selection in LTE/LTE-Advanced system","authors":"Z. Bai, C. Spiegel, G. Bruck, P. Jung, Michael Horvat, J. Berkmann, C. Drewes, B. Gunzelmann","doi":"10.1109/ISABEL.2010.5702841","DOIUrl":"https://doi.org/10.1109/ISABEL.2010.5702841","url":null,"abstract":"Recently, the LTE (Long Term Evolution) and LTE-Advanced systems, developed by the 3GPP (Third Generation Partnership Project), has been proposed as the candidate for the 4G systems (forth mobile communication systems). The combination of OFDM (orthogonal frequency division multiplexing) and MIMO (multiple-input multiple-output) transmission technologies has been introduced into LTE systems for achieving high system performance required by 4G systems. Furthermore, the closed-loop concept with codebook based precoding MIMO and dynamic transmission mode selection, termed as RI (rank indicator) selection, have also been deployed in LTE systems to provide robust link connection and large cell coverage. In this manuscript, the authors focused on the study of dynamic transmission mode selection and its implementation in LTE systems. Different RI selection schemes were proposed in this manuscript with the corresponding downlink performance evaluation. According to the analytical and numerical results, the authors conclude that the mutual information based scheme is the best candidate for RI selection in LTE/LTE-Advanced compliant systems.","PeriodicalId":165367,"journal":{"name":"2010 3rd International Symposium on Applied Sciences in Biomedical and Communication Technologies (ISABEL 2010)","volume":"191 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128571009","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}
Pub Date : 2010-11-01DOI: 10.1109/ISABEL.2010.5702919
E. Molteni, E. Preatoni, V. Cimolin, A. Bianchi, R. Rodano, M. Galli, S. Cerutti
The aim of this work was to design a protocol for the multifactorial assessment of the different sub-functions Motor Learning involves (e.g. planning, execution, correction, …). Attention was focused onto the issue of Motor Adaptation (MA), which occurs when a partial (but not complete) learning of a new motor strategy is needed. Indeed, motor learning is defined as the type of learning in which motor commands are altered to compensate for disturbances in the external environment. We hereby present a report about the methodological set-up which has been developed and tested for the investigation of motor adaptation during repetitive pointing tasks. We exploited the potentialities of the combined use of electroencephalographic and motion analysis techniques to find possible relation between the activity of the central nervous system and the neuro-musculo-skeletal one. The adaptation-related changes in oscillatory brain activity and movement kinematics were monitored during a visually-guided, feedback-controlled, sequence of pointing tasks. Our preliminary results suggest that the proposed protocol: (i) can discern modifications of brain activity in the alpha and beta frequency bands; (ii) is sensible to kinematic alterations; and, (iii), allows a quantitative evaluation of performance in terms of both final result and motor patterns. In this work we identified a bunch of possible neuro-motor biomarkers, which we propose as possible indicators of adaptation.
{"title":"Proposal of a combined optoelectronic and electroencephalographic method for the study of kinematic and neural correlates of Motor Adaptation","authors":"E. Molteni, E. Preatoni, V. Cimolin, A. Bianchi, R. Rodano, M. Galli, S. Cerutti","doi":"10.1109/ISABEL.2010.5702919","DOIUrl":"https://doi.org/10.1109/ISABEL.2010.5702919","url":null,"abstract":"The aim of this work was to design a protocol for the multifactorial assessment of the different sub-functions Motor Learning involves (e.g. planning, execution, correction, …). Attention was focused onto the issue of Motor Adaptation (MA), which occurs when a partial (but not complete) learning of a new motor strategy is needed. Indeed, motor learning is defined as the type of learning in which motor commands are altered to compensate for disturbances in the external environment. We hereby present a report about the methodological set-up which has been developed and tested for the investigation of motor adaptation during repetitive pointing tasks. We exploited the potentialities of the combined use of electroencephalographic and motion analysis techniques to find possible relation between the activity of the central nervous system and the neuro-musculo-skeletal one. The adaptation-related changes in oscillatory brain activity and movement kinematics were monitored during a visually-guided, feedback-controlled, sequence of pointing tasks. Our preliminary results suggest that the proposed protocol: (i) can discern modifications of brain activity in the alpha and beta frequency bands; (ii) is sensible to kinematic alterations; and, (iii), allows a quantitative evaluation of performance in terms of both final result and motor patterns. In this work we identified a bunch of possible neuro-motor biomarkers, which we propose as possible indicators of adaptation.","PeriodicalId":165367,"journal":{"name":"2010 3rd International Symposium on Applied Sciences in Biomedical and Communication Technologies (ISABEL 2010)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133608373","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}
Pub Date : 2010-11-01DOI: 10.1109/ISABEL.2010.5702885
B. Blankertz, Nico M. Schmidt, M. Treder
One of the foremost goals of rehabilitative Brain-Computer Interface (BCI) research is to design a mental typewriter, that enables paralyzed patients to communicate with their environment based on their brain activity. For the most popular candidate, the so called Matrix Speller, a recent study has shown that the spelling accuracy completely breaks down when the user is not allowed to fixate the target symbol by gaze but rather a central fixation point. This observation raises the need for BCI spellers that work effectively also for patients who have lost the ability to shift their gaze to a required position. Here we will present three variants of visual spellers that are based on covert spatial attention and on non-spatial feature attention. The results of our study with 13 healthy participants impressively demonstrate that these spellers obtain a similar spelling performance during center fixation as the orignal Matrix Speller with target fixation.
{"title":"Gaze-independent BCI spellers based on covert attention and feature attention","authors":"B. Blankertz, Nico M. Schmidt, M. Treder","doi":"10.1109/ISABEL.2010.5702885","DOIUrl":"https://doi.org/10.1109/ISABEL.2010.5702885","url":null,"abstract":"One of the foremost goals of rehabilitative Brain-Computer Interface (BCI) research is to design a mental typewriter, that enables paralyzed patients to communicate with their environment based on their brain activity. For the most popular candidate, the so called Matrix Speller, a recent study has shown that the spelling accuracy completely breaks down when the user is not allowed to fixate the target symbol by gaze but rather a central fixation point. This observation raises the need for BCI spellers that work effectively also for patients who have lost the ability to shift their gaze to a required position. Here we will present three variants of visual spellers that are based on covert spatial attention and on non-spatial feature attention. The results of our study with 13 healthy participants impressively demonstrate that these spellers obtain a similar spelling performance during center fixation as the orignal Matrix Speller with target fixation.","PeriodicalId":165367,"journal":{"name":"2010 3rd International Symposium on Applied Sciences in Biomedical and Communication Technologies (ISABEL 2010)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121838600","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}
Pub Date : 2010-11-01DOI: 10.1109/ISABEL.2010.5702828
M. Prado-Velasco, R. Marín, Ma Gloria del Rio Cidoncha
Falls are a serious and growing problem in the elderly and other population with chronic pathologies. However, none falling detector has been widely accepted by socio-healthcare providers yet. This work analyzes this issue and moves forward a new paradigm that hybridizes system biology with e-health domains. We present succinctly the technology and architecture of an avatar-based movement monitor based on this paradigm, together with an advancement of the first outcomes. ROC curves show the successful performance of a new algorithm compliant with it. Conclusions point to the effectivity of this technology.
{"title":"New approaches in personalized e-health: A wearable human avatar-based monitor for ubiquitous care: An avatar-based smart care monitor","authors":"M. Prado-Velasco, R. Marín, Ma Gloria del Rio Cidoncha","doi":"10.1109/ISABEL.2010.5702828","DOIUrl":"https://doi.org/10.1109/ISABEL.2010.5702828","url":null,"abstract":"Falls are a serious and growing problem in the elderly and other population with chronic pathologies. However, none falling detector has been widely accepted by socio-healthcare providers yet. This work analyzes this issue and moves forward a new paradigm that hybridizes system biology with e-health domains. We present succinctly the technology and architecture of an avatar-based movement monitor based on this paradigm, together with an advancement of the first outcomes. ROC curves show the successful performance of a new algorithm compliant with it. Conclusions point to the effectivity of this technology.","PeriodicalId":165367,"journal":{"name":"2010 3rd International Symposium on Applied Sciences in Biomedical and Communication Technologies (ISABEL 2010)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125157865","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}
Pub Date : 2010-11-01DOI: 10.1109/ISABEL.2010.5702821
O. Sayadi, M. Shamsollahi
We present generalizations of the previously published artificial models for generating abnormal cardiac rhythms to provide simulations of coupled cardiovascular (CV) signals with different beat morphologies. Using a joint dynamical formulation, we generate the normal morphologies of the cardiac cycle using a sum of Gaussian kernels, fitted to real CV recordings. The joint inter-dependencies of CV signals are introduced by assuming the same angular frequency and a phase coupling. Abnormal beats are then specified as new dynamical trajectories. An ergadic first-order Markov chain is also used for switching between normal and abnormal beat types. Probability transitions can be learned from real data or modeled by coupling to heart rate and sympathovagal balance. Natural morphology changes from beat-to-beat are incorporated by varying the angular frequency of the cardiac cycle as a function of the inter-beat interval. We demonstrate an example of the use of this model by simulating abnormal electrocardiographic effects including the ectopy and fusion. In addition, the HR-dependent pulsus phenomena are shown to result for ECG-ABP pairs. The approach presented in this paper may therefore serve as an effective framework for synthetic generation of coupled CV signals with different beat morphologies.
{"title":"A combined dynamical sequential network for generating coupled cardiovascular signals with different beat types","authors":"O. Sayadi, M. Shamsollahi","doi":"10.1109/ISABEL.2010.5702821","DOIUrl":"https://doi.org/10.1109/ISABEL.2010.5702821","url":null,"abstract":"We present generalizations of the previously published artificial models for generating abnormal cardiac rhythms to provide simulations of coupled cardiovascular (CV) signals with different beat morphologies. Using a joint dynamical formulation, we generate the normal morphologies of the cardiac cycle using a sum of Gaussian kernels, fitted to real CV recordings. The joint inter-dependencies of CV signals are introduced by assuming the same angular frequency and a phase coupling. Abnormal beats are then specified as new dynamical trajectories. An ergadic first-order Markov chain is also used for switching between normal and abnormal beat types. Probability transitions can be learned from real data or modeled by coupling to heart rate and sympathovagal balance. Natural morphology changes from beat-to-beat are incorporated by varying the angular frequency of the cardiac cycle as a function of the inter-beat interval. We demonstrate an example of the use of this model by simulating abnormal electrocardiographic effects including the ectopy and fusion. In addition, the HR-dependent pulsus phenomena are shown to result for ECG-ABP pairs. The approach presented in this paper may therefore serve as an effective framework for synthetic generation of coupled CV signals with different beat morphologies.","PeriodicalId":165367,"journal":{"name":"2010 3rd International Symposium on Applied Sciences in Biomedical and Communication Technologies (ISABEL 2010)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129127964","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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