Pub Date : 2010-11-01DOI: 10.1504/IJAACS.2014.067241
O. Ognenoski, B. Jankuloska, V. Atanasovski, L. Gavrilovska
This paper investigates a simple opportunistic resource sharing scheme enhanced with a borrowing concept from a traffic viewpoint. Resources (such as spectrum, channels etc.) are shared between primary and secondary users through a centralized scheme deployed at a base station. The primary users have the preemptive channel access, whereas the secondary ones opportunistically use the available channels. The borrowing concept is introduced to increase the resource availability at the base station level. Evaluations are carried via service retainability, service completions and cumulative effect analysis as relevant secondary users's metrics. The results provide guidelines for designing effective borrowing schemes in terms of quantity of the borrowed resources and the borrowing time duration.
{"title":"Performance of resource sharing and borrowing in opportunistic access systems","authors":"O. Ognenoski, B. Jankuloska, V. Atanasovski, L. Gavrilovska","doi":"10.1504/IJAACS.2014.067241","DOIUrl":"https://doi.org/10.1504/IJAACS.2014.067241","url":null,"abstract":"This paper investigates a simple opportunistic resource sharing scheme enhanced with a borrowing concept from a traffic viewpoint. Resources (such as spectrum, channels etc.) are shared between primary and secondary users through a centralized scheme deployed at a base station. The primary users have the preemptive channel access, whereas the secondary ones opportunistically use the available channels. The borrowing concept is introduced to increase the resource availability at the base station level. Evaluations are carried via service retainability, service completions and cumulative effect analysis as relevant secondary users's metrics. The results provide guidelines for designing effective borrowing schemes in terms of quantity of the borrowed resources and the borrowing time duration.","PeriodicalId":165367,"journal":{"name":"2010 3rd International Symposium on Applied Sciences in Biomedical and Communication Technologies (ISABEL 2010)","volume":"41 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":"128519307","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.2010.5702784
Jingjing Shi, Jianqing Wang
This paper aims at the feasibility study of a wireless link for capsule endoscope by using of low-band ultra wideband (UWB) signals. The UWB technique has a potential to provide real-time image transmission from the inside to outside of the body, but it suffers from the large attenuation in the human tissue. We employ the finite difference time domain (FDTD) numerical technique together with an anatomical human body model to derive the channel characteristics such as the path loss and shadow fading. We also investigate the feasibility to use a space diversity technique to improve the communication performance. The results have shown a possibility to use the low-band UWB technique to realize a data rate as high as 80 Mbps for the capsule endoscope application.
{"title":"Channel characterization and diversity feasibility for in-body to on-body communication using low-band UWB signals","authors":"Jingjing Shi, Jianqing Wang","doi":"10.1109/ISABEL.2010.5702784","DOIUrl":"https://doi.org/10.1109/ISABEL.2010.5702784","url":null,"abstract":"This paper aims at the feasibility study of a wireless link for capsule endoscope by using of low-band ultra wideband (UWB) signals. The UWB technique has a potential to provide real-time image transmission from the inside to outside of the body, but it suffers from the large attenuation in the human tissue. We employ the finite difference time domain (FDTD) numerical technique together with an anatomical human body model to derive the channel characteristics such as the path loss and shadow fading. We also investigate the feasibility to use a space diversity technique to improve the communication performance. The results have shown a possibility to use the low-band UWB technique to realize a data rate as high as 80 Mbps for the capsule endoscope application.","PeriodicalId":165367,"journal":{"name":"2010 3rd International Symposium on Applied Sciences in Biomedical and Communication Technologies (ISABEL 2010)","volume":"30 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":"122307624","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.2010.5702894
P. Brady, Martin Hill, Joseph Connell, John Barrett, B. Fennessy, P. O'sullivan, D. O'Hare
This paper investigates the effects of drill speed, burr type, burr style, and stroke speed on the acoustics that are generated from a surgical drill when dissecting the squamous temporal bone region. Multivariate regression is used to analyse and predict the Mel frequency cepstrum of the audio that is generated during the procedure. It is seen that each of drilling parameters along with their higher order interaction terms has a significant affect on the acoustic drilling signature of the squamous temporal bone. Furthermore, it was established, for the first time, that a categorical multivariate regressive model could consistently predict the Mel frequency cepstrum of the squamous temporal bone with accuracy of 97.78% with only 2 seconds of audio training data. This represents a significant advance on previously reported work.
{"title":"The effects of drilling parameters on the acoustic drilling signature of the squamous temporal bone: A categorical multivariate regressive analysis","authors":"P. Brady, Martin Hill, Joseph Connell, John Barrett, B. Fennessy, P. O'sullivan, D. O'Hare","doi":"10.1109/ISABEL.2010.5702894","DOIUrl":"https://doi.org/10.1109/ISABEL.2010.5702894","url":null,"abstract":"This paper investigates the effects of drill speed, burr type, burr style, and stroke speed on the acoustics that are generated from a surgical drill when dissecting the squamous temporal bone region. Multivariate regression is used to analyse and predict the Mel frequency cepstrum of the audio that is generated during the procedure. It is seen that each of drilling parameters along with their higher order interaction terms has a significant affect on the acoustic drilling signature of the squamous temporal bone. Furthermore, it was established, for the first time, that a categorical multivariate regressive model could consistently predict the Mel frequency cepstrum of the squamous temporal bone with accuracy of 97.78% with only 2 seconds of audio training data. This represents a significant advance on previously reported work.","PeriodicalId":165367,"journal":{"name":"2010 3rd International Symposium on Applied Sciences in Biomedical and Communication Technologies (ISABEL 2010)","volume":"17 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":"125451174","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.2010.5702911
M. Strackx, E. D'Agostino, G. Vandenbosch, P. Reynaert, P. Leroux
A model for simulating reflections of ultrawideband (UWB) pulses in multilayered tissue structures, has been implemented and verified using commercially available software. The permittivity of the different layers was altered sequentially and the corresponding reflections have been analyzed. Building on these experiments, the use of pulsed UWB is envisaged for the in-vivo measurement of complex tissue permittivity, in a non invasive way. Eventually, we will apply this technique to radiotherapy, trying to correlate the changes in permittivity with the absorbed radiation dose. A measurement setup using Time-Domain Reflectometry (TDR) is proposed.
{"title":"Measuring material/tissue permittivity by UWB Time-domain Reflectometry techniques","authors":"M. Strackx, E. D'Agostino, G. Vandenbosch, P. Reynaert, P. Leroux","doi":"10.1109/ISABEL.2010.5702911","DOIUrl":"https://doi.org/10.1109/ISABEL.2010.5702911","url":null,"abstract":"A model for simulating reflections of ultrawideband (UWB) pulses in multilayered tissue structures, has been implemented and verified using commercially available software. The permittivity of the different layers was altered sequentially and the corresponding reflections have been analyzed. Building on these experiments, the use of pulsed UWB is envisaged for the in-vivo measurement of complex tissue permittivity, in a non invasive way. Eventually, we will apply this technique to radiotherapy, trying to correlate the changes in permittivity with the absorbed radiation dose. A measurement setup using Time-Domain Reflectometry (TDR) is proposed.","PeriodicalId":165367,"journal":{"name":"2010 3rd International Symposium on Applied Sciences in Biomedical and Communication Technologies (ISABEL 2010)","volume":"10 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":"126254553","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.2010.5702768
Hanwen Cao, Souhir Daoud, A. Wilzeck, T. Kaiser
Multi-carrier techniques such as OFDM are widely adopted in the physical layer of nowadays radio communication and broadcasting systems. Therefore in cognitive radio, a robust spectrum sensing techniques for such signals is highly desired. Comparing with traditional Cyclic Prefix (CP) based method, newly reported Time-Domain Symbol Cross-correlation based spectrum sensing (TDSC) method [1][2] shows both advantages in sensing accuracy and robustness against shortness of and channel time spread pollution to CP. This sensing method is able to sense all multi-carrier signals with repeated pilot patterns. In this paper, further validations of TDSC-NP (Neyman-Pearson) and TDSC-MRC (Maximal Ratio Combining) methods are presented with practical issues taken into account, e.g. noise uncertainty, oscillator imperfection and computational complexity. The feasibility of applying TDSC for sensing Filter Bank Multi-Carrier (FBMC) signal is validated via simulation. Both simulated signal and captured DVB-T signal with real-world multi-path channel fading are analyzed and the sensing performance of captured signal agrees with that of simulated signal very well.
在当今无线电通信和广播系统的物理层中，广泛采用了OFDM等多载波技术。因此，在认知无线电中，迫切需要一种针对此类信号的鲁棒频谱感知技术。与传统的基于循环前缀(CP)的方法相比，新报道的基于时域符号相互关联的频谱感知(TDSC)方法[1][2]在感知精度和抗CP短污染和信道时间扩散污染的鲁棒性方面都具有优势，该感知方法能够感知所有具有重复导频模式的多载波信号。在本文中，进一步验证了TDSC-NP (Neyman-Pearson)和TDSC-MRC (maximum Ratio combined)方法，并考虑了噪声不确定性、振荡器缺陷和计算复杂性等实际问题。通过仿真验证了TDSC应用于滤波组多载波(FBMC)信号检测的可行性。对仿真信号和捕获的真实多径信道衰落的DVB-T信号进行了分析，捕获信号的感知性能与模拟信号的感知性能吻合良好。
{"title":"Practical issues in spectrum sensing for multi-carrier system employing pilot tones","authors":"Hanwen Cao, Souhir Daoud, A. Wilzeck, T. Kaiser","doi":"10.1109/ISABEL.2010.5702768","DOIUrl":"https://doi.org/10.1109/ISABEL.2010.5702768","url":null,"abstract":"Multi-carrier techniques such as OFDM are widely adopted in the physical layer of nowadays radio communication and broadcasting systems. Therefore in cognitive radio, a robust spectrum sensing techniques for such signals is highly desired. Comparing with traditional Cyclic Prefix (CP) based method, newly reported Time-Domain Symbol Cross-correlation based spectrum sensing (TDSC) method [1][2] shows both advantages in sensing accuracy and robustness against shortness of and channel time spread pollution to CP. This sensing method is able to sense all multi-carrier signals with repeated pilot patterns. In this paper, further validations of TDSC-NP (Neyman-Pearson) and TDSC-MRC (Maximal Ratio Combining) methods are presented with practical issues taken into account, e.g. noise uncertainty, oscillator imperfection and computational complexity. The feasibility of applying TDSC for sensing Filter Bank Multi-Carrier (FBMC) signal is validated via simulation. Both simulated signal and captured DVB-T signal with real-world multi-path channel fading are analyzed and the sensing performance of captured signal agrees with that of simulated signal very well.","PeriodicalId":165367,"journal":{"name":"2010 3rd International Symposium on Applied Sciences in Biomedical and Communication Technologies (ISABEL 2010)","volume":"16 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":"124362196","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.2010.5702857
Jerald Yoo
This paper introduces two emerging wearable technologies: Planar-Fabric Circuit Board (P-FCB) and Silicon-on-Clothes (SoC). P-FCB enables fabric itself to become a circuit board and it maximizes wearer's comfort and safety. Discrete components and dry fabric electrodes made out of P-FCB is discussed and their electrical characteristics are shown. SoC directly integrates silicon chip onto P-FCB to form a system. With these technologies, an example patch sensor is also presented.
{"title":"Planar-Fabric Circuit Board and Silicon-on-Clothes for wearable healthcare applications","authors":"Jerald Yoo","doi":"10.1109/ISABEL.2010.5702857","DOIUrl":"https://doi.org/10.1109/ISABEL.2010.5702857","url":null,"abstract":"This paper introduces two emerging wearable technologies: Planar-Fabric Circuit Board (P-FCB) and Silicon-on-Clothes (SoC). P-FCB enables fabric itself to become a circuit board and it maximizes wearer's comfort and safety. Discrete components and dry fabric electrodes made out of P-FCB is discussed and their electrical characteristics are shown. SoC directly integrates silicon chip onto P-FCB to form a system. With these technologies, an example patch sensor is also presented.","PeriodicalId":165367,"journal":{"name":"2010 3rd International Symposium on Applied Sciences in Biomedical and Communication Technologies (ISABEL 2010)","volume":"1 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":"128965408","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.2010.5702842
C. Spiegel, Sebastian Rickers, G. Bruck, P. Jung
In practical communication systems, frequency offsets between transmitters and receivers cannot be avoided. Both transmitter and receiver require local clocks which are usually derived from independent crystal oscillators. Typical low-cost crystals show a relative frequency tolerance of 20 ppm. Though devices with less tolerance are available, they are too expensive for most mass market devices. It is rather desirable to attempt to estimate and correct the frequency offset at the receiver side, preferably in digital domain. For regular sampling based receivers, such algorithms can be considered well-known [1]. However, for irregular sampling schemes such as zero-crossing demodulation, neither the impact on the receiver performance nor ways of estimating and correcting frequency offsets are widely known. This manuscript is a first attempt to close this gap.
{"title":"Impact of frequency offsets on zero crossing demodulation based receivers","authors":"C. Spiegel, Sebastian Rickers, G. Bruck, P. Jung","doi":"10.1109/ISABEL.2010.5702842","DOIUrl":"https://doi.org/10.1109/ISABEL.2010.5702842","url":null,"abstract":"In practical communication systems, frequency offsets between transmitters and receivers cannot be avoided. Both transmitter and receiver require local clocks which are usually derived from independent crystal oscillators. Typical low-cost crystals show a relative frequency tolerance of 20 ppm. Though devices with less tolerance are available, they are too expensive for most mass market devices. It is rather desirable to attempt to estimate and correct the frequency offset at the receiver side, preferably in digital domain. For regular sampling based receivers, such algorithms can be considered well-known [1]. However, for irregular sampling schemes such as zero-crossing demodulation, neither the impact on the receiver performance nor ways of estimating and correcting frequency offsets are widely known. This manuscript is a first attempt to close this gap.","PeriodicalId":165367,"journal":{"name":"2010 3rd International Symposium on Applied Sciences in Biomedical and Communication Technologies (ISABEL 2010)","volume":"182 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":"133551031","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.2010.5702793
A. Beriain, A. Vaz, I. Rebollo, I. Zalbide, J. F. Sevillano, R. Berenguer
There is a strong motivation for the implementation of electronic identification systems and wireless sensors in hospitals. This work presents a sensor enabled passive RFID tag for patient monitorization. Special attention is paid to the analog FE, which has been designed and implemented in a low cost 0.35µm CMOS standard process. The proposed front-end architecture allows the implementation of power management techniques that, together with the power optimized blocks and the use of Schottky diodes in the voltage multiplier, achieves a long reading range. The fabricated analog front-end, assembled to a matched dipole antenna, is able to provide a wireless communication up to 2.4m from a 2W EIRP output power reader to a digital module+sensor with an average power consumption up to 37.5µW. The system has been tested with a temperature sensor. Successful ID and temperature communication with a commercial RFID reader over a distance of approximately 2m has been reported. The results demonstrate the capacity of the proposed system for wireless patient monitorization.
在医院实施电子识别系统和无线传感器有很强的动机。这项工作提出了一种用于患者监测的传感器使能的无源RFID标签。特别关注模拟有限元，它已经在低成本的0.35 μ m CMOS标准工艺中设计和实现。所提出的前端架构允许实现电源管理技术，以及功率优化模块和在电压乘法器中使用肖特基二极管，从而实现较长的读取范围。预制的模拟前端与匹配的偶极子天线组装在一起，能够提供从2W EIRP输出功率读取器到数字模块+传感器之间长达2.4m的无线通信，平均功耗高达37.5 μ W。该系统已经用温度传感器进行了测试。据报道，在大约2米的距离上，成功地与商用RFID读取器进行ID和温度通信。实验结果证明了所提出的无线病人监护系统的能力。
{"title":"Wireless patient monitorization using full passive devices","authors":"A. Beriain, A. Vaz, I. Rebollo, I. Zalbide, J. F. Sevillano, R. Berenguer","doi":"10.1109/ISABEL.2010.5702793","DOIUrl":"https://doi.org/10.1109/ISABEL.2010.5702793","url":null,"abstract":"There is a strong motivation for the implementation of electronic identification systems and wireless sensors in hospitals. This work presents a sensor enabled passive RFID tag for patient monitorization. Special attention is paid to the analog FE, which has been designed and implemented in a low cost 0.35µm CMOS standard process. The proposed front-end architecture allows the implementation of power management techniques that, together with the power optimized blocks and the use of Schottky diodes in the voltage multiplier, achieves a long reading range. The fabricated analog front-end, assembled to a matched dipole antenna, is able to provide a wireless communication up to 2.4m from a 2W EIRP output power reader to a digital module+sensor with an average power consumption up to 37.5µW. The system has been tested with a temperature sensor. Successful ID and temperature communication with a commercial RFID reader over a distance of approximately 2m has been reported. The results demonstrate the capacity of the proposed system for wireless patient monitorization.","PeriodicalId":165367,"journal":{"name":"2010 3rd International Symposium on Applied Sciences in Biomedical and Communication Technologies (ISABEL 2010)","volume":"130 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":"134089718","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.2010.5702847
Yuan Tian, Xia Lei, Yue Xiao, Shaoqian Li
In multi-user multi-input multi-output (MIMO) systems, multiple timing and frequency offsets may occur in the procedure of synchronization. Conventional MIMO synchronization methods deal with timing and frequency offsets separately. In fact, these methods can not achieve the best performances because the unknown parameters will interfere with each other. In this paper, we propose a joint timing-frequency offsets and channel estimation method in multi-user MIMO systems. Based on a maximum-likelihood (ML) estimation model, an iterative space-alternating generalized expectation-maximization (SAGE) estimator is adopted to solve the multi-dimensional extreme-value problem. Simulations show that the performances of the proposed scheme are better than the conventional method.
{"title":"An iterative synchronization scheme for multi-user MIMO systems","authors":"Yuan Tian, Xia Lei, Yue Xiao, Shaoqian Li","doi":"10.1109/ISABEL.2010.5702847","DOIUrl":"https://doi.org/10.1109/ISABEL.2010.5702847","url":null,"abstract":"In multi-user multi-input multi-output (MIMO) systems, multiple timing and frequency offsets may occur in the procedure of synchronization. Conventional MIMO synchronization methods deal with timing and frequency offsets separately. In fact, these methods can not achieve the best performances because the unknown parameters will interfere with each other. In this paper, we propose a joint timing-frequency offsets and channel estimation method in multi-user MIMO systems. Based on a maximum-likelihood (ML) estimation model, an iterative space-alternating generalized expectation-maximization (SAGE) estimator is adopted to solve the multi-dimensional extreme-value problem. Simulations show that the performances of the proposed scheme are better than the conventional method.","PeriodicalId":165367,"journal":{"name":"2010 3rd International Symposium on Applied Sciences in Biomedical and Communication Technologies (ISABEL 2010)","volume":"18 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":"127954174","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.2010.5702855
A. Lanatà, G. Valenza, E. Scilingo
In this paper we implement an automatic procedure that is to be embedded in a wearable system in order to discriminate five arrhythmic classes of QRS complexes from normal ones. Due to the limited hardware resources offered by the wearable system, several requirements such as low computational cost, memory usage, reliability and real-time have to be addressed. In order to better comply with these requirements, the classification process is performed using features that can easily be extracted from the signals, i.e. magnitude and phase of the Fourier Transform (FT) applied to the QRS complexes. The ECG signals, from which QRS complexes are extracted, are gathered from the MIT-Arrhythmias Database. More specifically, three datasets of features are created: the first (alpha) is obtained from the magnitude, the second (beta) from the phase, and the third (gamma) from the union of the two. According to the results of the Royston Multivariate Normality Test, which verifies the gaussianity of the distribution of the three sets of features, a parametric, Nearest Mean Classifier (NMC), or non-parametric, MultiLayer Perceptron (MLP) classifier is used. The comparative performance evaluation is showed in terms of a confusion matrix obtained from twenty steps of cross validation. The matrices report the percentage of successful recognition of the six classes.
{"title":"The contribution of the phase spectrum in automatic multiple cardiac arrhythmias recognition in wearable systems","authors":"A. Lanatà, G. Valenza, E. Scilingo","doi":"10.1109/ISABEL.2010.5702855","DOIUrl":"https://doi.org/10.1109/ISABEL.2010.5702855","url":null,"abstract":"In this paper we implement an automatic procedure that is to be embedded in a wearable system in order to discriminate five arrhythmic classes of QRS complexes from normal ones. Due to the limited hardware resources offered by the wearable system, several requirements such as low computational cost, memory usage, reliability and real-time have to be addressed. In order to better comply with these requirements, the classification process is performed using features that can easily be extracted from the signals, i.e. magnitude and phase of the Fourier Transform (FT) applied to the QRS complexes. The ECG signals, from which QRS complexes are extracted, are gathered from the MIT-Arrhythmias Database. More specifically, three datasets of features are created: the first (alpha) is obtained from the magnitude, the second (beta) from the phase, and the third (gamma) from the union of the two. According to the results of the Royston Multivariate Normality Test, which verifies the gaussianity of the distribution of the three sets of features, a parametric, Nearest Mean Classifier (NMC), or non-parametric, MultiLayer Perceptron (MLP) classifier is used. The comparative performance evaluation is showed in terms of a confusion matrix obtained from twenty steps of cross validation. The matrices report the percentage of successful recognition of the six classes.","PeriodicalId":165367,"journal":{"name":"2010 3rd International Symposium on Applied Sciences in Biomedical and Communication Technologies (ISABEL 2010)","volume":"138 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":"116408302","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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