Pub Date : 2021-07-05DOI: 10.1109/MOCAST52088.2021.9493372
Aqeela Saghir, David Chatzichristodoulou, Abdul Quddious, S. Nikolaou, P. Vryonides
A novel cross-shaped resonator composed of parallel coupled-lines for the design of high-selectivity single- and dual-band bandpass filters (BPF) is presented in this paper. The proposed resonator consists of four pairs of quarter-wavelength parallel coupled-lines two of which having one leg short-circuited. Even and odd mode analysis is performed for the exact derivation of the transmission poles. By adding a quarter wavelength open-circuited stub at the input and output ports two passbands can be created on each side of the operation frequency. To validate the theoretical analysis, the two filters are designed and simulated demonstrating the simple design procedure. Both single- and dual-band BPFs demonstrate an exceptional insertion loss of 0.23 and 0.77 dB respectively. The single –band BPF has a center frequency of 2.94 GHZ and a -3dB fractional bandwidth (FBW) of 50% with good filtering performance, sharp roll- off factor and return loss better than 25dB for the entire passband. The dual- band BPF is centered at 2.2/3.6 GHz having -3dB FBW of 10%/6.7% respectively.
{"title":"High-Selectivity Single- and Dual-Band BPF Using a Cross Shaped Coupled-Line Resonator","authors":"Aqeela Saghir, David Chatzichristodoulou, Abdul Quddious, S. Nikolaou, P. Vryonides","doi":"10.1109/MOCAST52088.2021.9493372","DOIUrl":"https://doi.org/10.1109/MOCAST52088.2021.9493372","url":null,"abstract":"A novel cross-shaped resonator composed of parallel coupled-lines for the design of high-selectivity single- and dual-band bandpass filters (BPF) is presented in this paper. The proposed resonator consists of four pairs of quarter-wavelength parallel coupled-lines two of which having one leg short-circuited. Even and odd mode analysis is performed for the exact derivation of the transmission poles. By adding a quarter wavelength open-circuited stub at the input and output ports two passbands can be created on each side of the operation frequency. To validate the theoretical analysis, the two filters are designed and simulated demonstrating the simple design procedure. Both single- and dual-band BPFs demonstrate an exceptional insertion loss of 0.23 and 0.77 dB respectively. The single –band BPF has a center frequency of 2.94 GHZ and a -3dB fractional bandwidth (FBW) of 50% with good filtering performance, sharp roll- off factor and return loss better than 25dB for the entire passband. The dual- band BPF is centered at 2.2/3.6 GHz having -3dB FBW of 10%/6.7% respectively.","PeriodicalId":146990,"journal":{"name":"2021 10th International Conference on Modern Circuits and Systems Technologies (MOCAST)","volume":"133 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122667287","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 : 2021-07-05DOI: 10.1109/MOCAST52088.2021.9493351
G. K. Varotsos, H. Nistazakis, K. Aidinis, F. Jaber, M. Nasor, K. K. M. Rahman
Ongoing research into implantable medical devices (IMDs) and optical wireless communication (OWC) links has recently revealed the feasibility of establishing high speed transdermal optical wireless (TOW) communication links between an in-body device and an external one with a reasonable low power consumption. Still, numerous emerging biomedical applications including mainly cortical recording and neural prosthesis require an increasingly higher modulation bandwidth and need to harvest the full benefits of this optical wireless communication modality. Thus, in the present contribution the potential of the enhancement of TOW spectral efficiency is investigated by utilizing the bandwidth efficient L symbol pulse amplitude modulation (L-PAM) scheme. In more detail, by taking varying and realistic parameter values for a typical direct TOW link into account and by considering also transdermal pathloss and the stochastic nature of weak to strong pointing errors, the average bit error rate (ABER) performance metric is evaluated for various PAM configurations. In this context, novel ABER analytical expressions are derived. Corresponding results which are further validated by Monte Carlo simulations over a wide signal to noise ratio (SNR) regime demonstrate the feasibility of our suggestions.
{"title":"On the Utilization of L-PAM Technique in Transdermal Optical Wireless Links with Stochastic Pointing Errors for ABER Performance Estimation","authors":"G. K. Varotsos, H. Nistazakis, K. Aidinis, F. Jaber, M. Nasor, K. K. M. Rahman","doi":"10.1109/MOCAST52088.2021.9493351","DOIUrl":"https://doi.org/10.1109/MOCAST52088.2021.9493351","url":null,"abstract":"Ongoing research into implantable medical devices (IMDs) and optical wireless communication (OWC) links has recently revealed the feasibility of establishing high speed transdermal optical wireless (TOW) communication links between an in-body device and an external one with a reasonable low power consumption. Still, numerous emerging biomedical applications including mainly cortical recording and neural prosthesis require an increasingly higher modulation bandwidth and need to harvest the full benefits of this optical wireless communication modality. Thus, in the present contribution the potential of the enhancement of TOW spectral efficiency is investigated by utilizing the bandwidth efficient L symbol pulse amplitude modulation (L-PAM) scheme. In more detail, by taking varying and realistic parameter values for a typical direct TOW link into account and by considering also transdermal pathloss and the stochastic nature of weak to strong pointing errors, the average bit error rate (ABER) performance metric is evaluated for various PAM configurations. In this context, novel ABER analytical expressions are derived. Corresponding results which are further validated by Monte Carlo simulations over a wide signal to noise ratio (SNR) regime demonstrate the feasibility of our suggestions.","PeriodicalId":146990,"journal":{"name":"2021 10th International Conference on Modern Circuits and Systems Technologies (MOCAST)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122917512","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 : 2021-07-05DOI: 10.1109/MOCAST52088.2021.9493345
I. Roditis, E. Koutroulis
Nowadays, renewable energy sources (RES) in combination with power systems having the capability of storing electric energy are increasingly used in distributed generation applications. Multiport DC/AC inverters are required for the integration of RESs and energy storage systems with the electric grid and local loads. Recently, a variety of multiport DC/AC inverter topologies have been reported in the literature. In this paper, a comparative study of various alternative non-isolated DC/AC three-port converter (TPC) topologies is performed, when they are used as the power electronic interface between photovoltaic arrays, battery energy storage units and the electric grid/load. This study focuses on the performance of these topologies in terms of the leakage ground current and the battery ripple current during charging and discharging in distributed generation systems. A comparative performance evaluation of the alternative multiport DC/AC inverter topologies has been performed in Matlab/Simulink for the case of a 2 kW distributed energy system and the simulation results are presented.
{"title":"Comparative Performance Evaluation of Multiport DC/AC Inverters for Distributed Generation Applications","authors":"I. Roditis, E. Koutroulis","doi":"10.1109/MOCAST52088.2021.9493345","DOIUrl":"https://doi.org/10.1109/MOCAST52088.2021.9493345","url":null,"abstract":"Nowadays, renewable energy sources (RES) in combination with power systems having the capability of storing electric energy are increasingly used in distributed generation applications. Multiport DC/AC inverters are required for the integration of RESs and energy storage systems with the electric grid and local loads. Recently, a variety of multiport DC/AC inverter topologies have been reported in the literature. In this paper, a comparative study of various alternative non-isolated DC/AC three-port converter (TPC) topologies is performed, when they are used as the power electronic interface between photovoltaic arrays, battery energy storage units and the electric grid/load. This study focuses on the performance of these topologies in terms of the leakage ground current and the battery ripple current during charging and discharging in distributed generation systems. A comparative performance evaluation of the alternative multiport DC/AC inverter topologies has been performed in Matlab/Simulink for the case of a 2 kW distributed energy system and the simulation results are presented.","PeriodicalId":146990,"journal":{"name":"2021 10th International Conference on Modern Circuits and Systems Technologies (MOCAST)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128793794","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 : 2021-07-05DOI: 10.1109/MOCAST52088.2021.9493366
M. A. Boulasikis, M. Birbas, N. Tsafas, Nikos Kanakaris
Recent advances in the field of computer vision create the demand for larger and more complex architectures for Deep Convolutional Neural Networks (CNNs). As a result, computation time and memory usage become the main bottleneck in applied deep network inference, particularly in Embedded Systems implementations. Parameter quantization is often employed in these cases to minimize the detrimental effect of the aforementioned bottlenecks. In this paper, low level hardware optimizations on fixed point convolution are considered. Emphasis is given on the utilization of Digital Signal Processing Units (DSPs) as dual multipliers and on practical considerations. Three—by— three convolution kernels are formulated based on this research and are measured as case studies. The experiments show that the proper exploitation of dual multipliers can offer significant benefits to the system.
{"title":"Efficient Utilization of FPGA Multipliers for Convolutional Neural Networks","authors":"M. A. Boulasikis, M. Birbas, N. Tsafas, Nikos Kanakaris","doi":"10.1109/MOCAST52088.2021.9493366","DOIUrl":"https://doi.org/10.1109/MOCAST52088.2021.9493366","url":null,"abstract":"Recent advances in the field of computer vision create the demand for larger and more complex architectures for Deep Convolutional Neural Networks (CNNs). As a result, computation time and memory usage become the main bottleneck in applied deep network inference, particularly in Embedded Systems implementations. Parameter quantization is often employed in these cases to minimize the detrimental effect of the aforementioned bottlenecks. In this paper, low level hardware optimizations on fixed point convolution are considered. Emphasis is given on the utilization of Digital Signal Processing Units (DSPs) as dual multipliers and on practical considerations. Three—by— three convolution kernels are formulated based on this research and are measured as case studies. The experiments show that the proper exploitation of dual multipliers can offer significant benefits to the system.","PeriodicalId":146990,"journal":{"name":"2021 10th International Conference on Modern Circuits and Systems Technologies (MOCAST)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126772384","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 : 2021-05-06DOI: 10.1109/MOCAST52088.2021.9493419
Stylianos E. Trevlakis, Alexandros-Apostolos A. Boulogeorgos, N. Chatzidiamantis
Optical wireless communications (OWCs) have been recognized as a candidate enabler of next generation in-body nano-scale networks and implants. The development of an accurate channel model capable of accommodating the particularities of different type of tissues is expected to boost the design of optimized communication protocols for such applications. Motivated by this, this paper focuses on presenting a general pathloss model for in-body OWCs. In particular, we use experimental measurements in order to extract analytical expressions for the absorption coefficients of the five main tissues’ constitutions, namely oxygenated and de-oxygenated blood, water, fat, and melanin. Building upon these expressions, we derive a general formula for the absorption coefficient evaluation of any biological tissue. To verify the validity of this formula, we compute the absorption coefficient of complex tissues and compare them against respective experimental results reported by independent research works. Interestingly, we observe that the analytical formula has high accuracy and is capable of modeling the pathloss and, therefore, the penetration depth in complex tissues.
{"title":"Pathloss modeling for in-body optical wireless communications","authors":"Stylianos E. Trevlakis, Alexandros-Apostolos A. Boulogeorgos, N. Chatzidiamantis","doi":"10.1109/MOCAST52088.2021.9493419","DOIUrl":"https://doi.org/10.1109/MOCAST52088.2021.9493419","url":null,"abstract":"Optical wireless communications (OWCs) have been recognized as a candidate enabler of next generation in-body nano-scale networks and implants. The development of an accurate channel model capable of accommodating the particularities of different type of tissues is expected to boost the design of optimized communication protocols for such applications. Motivated by this, this paper focuses on presenting a general pathloss model for in-body OWCs. In particular, we use experimental measurements in order to extract analytical expressions for the absorption coefficients of the five main tissues’ constitutions, namely oxygenated and de-oxygenated blood, water, fat, and melanin. Building upon these expressions, we derive a general formula for the absorption coefficient evaluation of any biological tissue. To verify the validity of this formula, we compute the absorption coefficient of complex tissues and compare them against respective experimental results reported by independent research works. Interestingly, we observe that the analytical formula has high accuracy and is capable of modeling the pathloss and, therefore, the penetration depth in complex tissues.","PeriodicalId":146990,"journal":{"name":"2021 10th International Conference on Modern Circuits and Systems Technologies (MOCAST)","volume":"152 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129529107","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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