Pub Date : 2015-07-13DOI: 10.1109/ConTEL.2015.7231209
T. Bauernfeind, W. Renhart, O. Bíró
Electrically small loop antennas are balanced devices by nature. Quite often such antennas are directly connected to a coaxial feed line e.g. the ISO/IEC 10373 test PCD antenna. The direct connection of such an antenna to the coaxial feed line leads to a mode conversion at the antenna terminals. In the present paper the influence of this mode conversion on the field distribution of an electrically short loop antenna is investigated in terms of finite element simulations applying an in-house software package. A method is introduced which allows the unbalanced mode excitation in the full wave simulation by prescribing appropriate boundary conditions.
{"title":"Investigations on ground compensation coils and their influence on the field distribution of electrically short loop antennas","authors":"T. Bauernfeind, W. Renhart, O. Bíró","doi":"10.1109/ConTEL.2015.7231209","DOIUrl":"https://doi.org/10.1109/ConTEL.2015.7231209","url":null,"abstract":"Electrically small loop antennas are balanced devices by nature. Quite often such antennas are directly connected to a coaxial feed line e.g. the ISO/IEC 10373 test PCD antenna. The direct connection of such an antenna to the coaxial feed line leads to a mode conversion at the antenna terminals. In the present paper the influence of this mode conversion on the field distribution of an electrically short loop antenna is investigated in terms of finite element simulations applying an in-house software package. A method is introduced which allows the unbalanced mode excitation in the full wave simulation by prescribing appropriate boundary conditions.","PeriodicalId":134613,"journal":{"name":"2015 13th International Conference on Telecommunications (ConTEL)","volume":"85 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123353044","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 : 2015-07-13DOI: 10.1109/ConTEL.2015.7231186
M. Dzanko, M. Furdek, B. Mikac, G. Zervas, E. Hugues-Salas, D. Simeonidou
Due to the large transmission speeds and enormous volumes of transferred data, network availability performance is one of the key issues in optical long-haul networks, comprising nodes implemented by optical cross-connects (OXCs). In this context, the design of OXCs is becoming very challenging since they have to support both legacy lower bit-rates and future highspeed super-channels by means of flexible allocation of spectral resources, and at the same time provide high availability of established connections. In this paper we study the availability and power consumption of different node architectures. We focus on the design of the new generation of synthetic programmable OXCs based on the Architecture on Demand concept which can reduce the number of utilized node components when a certain part of signals is switched at the fibre level, resulting in lower mean down time and power consumption compared to traditional node architectures.
由于传输速度快，传输数据量大，网络可用性性能是由光交叉连接(oxc)实现的节点组成的光长途网络的关键问题之一。在这种情况下，oxc的设计变得非常具有挑战性，因为它们必须通过灵活分配频谱资源来支持传统的低比特率和未来的高速超级信道，同时提供已建立连接的高可用性。本文研究了不同节点架构的可用性和功耗。我们专注于基于按需架构(Architecture on Demand)概念的新一代合成可编程oxc的设计，该概念可以在光纤级别切换特定部分信号时减少所使用的节点组件数量，从而与传统节点架构相比具有更低的平均停机时间和功耗。
{"title":"Synthesis, resiliency and power efficiency of function programmable optical nodes","authors":"M. Dzanko, M. Furdek, B. Mikac, G. Zervas, E. Hugues-Salas, D. Simeonidou","doi":"10.1109/ConTEL.2015.7231186","DOIUrl":"https://doi.org/10.1109/ConTEL.2015.7231186","url":null,"abstract":"Due to the large transmission speeds and enormous volumes of transferred data, network availability performance is one of the key issues in optical long-haul networks, comprising nodes implemented by optical cross-connects (OXCs). In this context, the design of OXCs is becoming very challenging since they have to support both legacy lower bit-rates and future highspeed super-channels by means of flexible allocation of spectral resources, and at the same time provide high availability of established connections. In this paper we study the availability and power consumption of different node architectures. We focus on the design of the new generation of synthetic programmable OXCs based on the Architecture on Demand concept which can reduce the number of utilized node components when a certain part of signals is switched at the fibre level, resulting in lower mean down time and power consumption compared to traditional node architectures.","PeriodicalId":134613,"journal":{"name":"2015 13th International Conference on Telecommunications (ConTEL)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121181941","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 : 2015-07-13DOI: 10.1109/ConTEL.2015.7231225
Aleksandar Antonic, M. Marjanović, Pavle Skocir, Ivana Podnar Žarko
Publish/subscribe messaging pattern is often used as a communication mechanism in data-oriented applications and is becoming wide-spread, especially due to the expansion of the Internet of Things (IoT) services and applications. In addition to MQTT, which is one of the commonly used publish/subscribe protocols in the context of IoT, there are a number of other message queuing solutions, either open or proprietary. We have designed a CloUd-based PUblish/Subscribe (CUPUS) middleware solution within the framework of the FP7 project OpenIoT1 that has developed an open-source cloud platform for the IoT. CUPUS is one of the core OpenIoT components which enables flexible integration of wearable sensors and mobile devices as data sources within the OpenIoT platform. In this paper we compare MQTT and CUPUS in the context of smart city application scenarios. Smart city services pose different key-requirements on IoT publish/subscribe solutions and thus we propose a taxonomy to identify vital features of IoT publish/subscribe middleware. The comparison shows that CUPUS is more appropriate for mobile environments with frequent context changes, while it can filter out unrequired data on devices prior to being reported to backend cloud servers. The MQTT protocol proves to be suitable for Wireless Sensor Networks (WSNs) and heterogeneous environments due to its small code footprint, low bandwidth usage and standardized interfaces. Finally we evaluate the two solutions in terms of message footprint in a real-world scenario, latency and delivery semantics.
{"title":"Comparison of the CUPUS middleware and MQTT protocol for smart city services","authors":"Aleksandar Antonic, M. Marjanović, Pavle Skocir, Ivana Podnar Žarko","doi":"10.1109/ConTEL.2015.7231225","DOIUrl":"https://doi.org/10.1109/ConTEL.2015.7231225","url":null,"abstract":"Publish/subscribe messaging pattern is often used as a communication mechanism in data-oriented applications and is becoming wide-spread, especially due to the expansion of the Internet of Things (IoT) services and applications. In addition to MQTT, which is one of the commonly used publish/subscribe protocols in the context of IoT, there are a number of other message queuing solutions, either open or proprietary. We have designed a CloUd-based PUblish/Subscribe (CUPUS) middleware solution within the framework of the FP7 project OpenIoT1 that has developed an open-source cloud platform for the IoT. CUPUS is one of the core OpenIoT components which enables flexible integration of wearable sensors and mobile devices as data sources within the OpenIoT platform. In this paper we compare MQTT and CUPUS in the context of smart city application scenarios. Smart city services pose different key-requirements on IoT publish/subscribe solutions and thus we propose a taxonomy to identify vital features of IoT publish/subscribe middleware. The comparison shows that CUPUS is more appropriate for mobile environments with frequent context changes, while it can filter out unrequired data on devices prior to being reported to backend cloud servers. The MQTT protocol proves to be suitable for Wireless Sensor Networks (WSNs) and heterogeneous environments due to its small code footprint, low bandwidth usage and standardized interfaces. Finally we evaluate the two solutions in terms of message footprint in a real-world scenario, latency and delivery semantics.","PeriodicalId":134613,"journal":{"name":"2015 13th International Conference on Telecommunications (ConTEL)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131298764","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 : 2015-07-13DOI: 10.1109/ConTEL.2015.7231206
Dunja Vučić, Lea Skorin-Kapov
Multi-party video conferencing has gained wide popularity, with numerous applications in both formal and informal contexts. With video conferencing being a highly interactive and resource-intensive service, challenges arise in identifying and quantifying the impact of various factors influencing end user Quality of Experience (QoE). In this paper we study QoE for mobile video conferencing, and focus on the impact of different smartphone configurations (differing in CPU, display size, and resolution) on quality ratings. We conduct subjective studies involving interactive three-party audiovisual conversations based on WebRTC technology in a natural environment over a Wi-Fi network with symmetric and asymmetric device conditions. Results clearly show the impact of different device factors on user QoE, and imply minimum smartphone requirements for three-party video conferencing as being a 2.5 GHz processor and 2GB RAM. In addition, we explore user-preferred functionalities available on the conferencing web page which improve overall user perceived quality.
{"title":"The impact of mobile device factors on QoE for multi-party video conferencing via WebRTC","authors":"Dunja Vučić, Lea Skorin-Kapov","doi":"10.1109/ConTEL.2015.7231206","DOIUrl":"https://doi.org/10.1109/ConTEL.2015.7231206","url":null,"abstract":"Multi-party video conferencing has gained wide popularity, with numerous applications in both formal and informal contexts. With video conferencing being a highly interactive and resource-intensive service, challenges arise in identifying and quantifying the impact of various factors influencing end user Quality of Experience (QoE). In this paper we study QoE for mobile video conferencing, and focus on the impact of different smartphone configurations (differing in CPU, display size, and resolution) on quality ratings. We conduct subjective studies involving interactive three-party audiovisual conversations based on WebRTC technology in a natural environment over a Wi-Fi network with symmetric and asymmetric device conditions. Results clearly show the impact of different device factors on user QoE, and imply minimum smartphone requirements for three-party video conferencing as being a 2.5 GHz processor and 2GB RAM. In addition, we explore user-preferred functionalities available on the conferencing web page which improve overall user perceived quality.","PeriodicalId":134613,"journal":{"name":"2015 13th International Conference on Telecommunications (ConTEL)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133199989","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 : 2015-07-13DOI: 10.1109/ConTEL.2015.7231213
Nina Gumzej, Drazen Dragicevic
The European Commission announced plans on evaluation of Directive 2002/58/EC (E-Privacy Directive) towards a possible review, but following agreement on the General Data Protection Regulation. Those plans were most recently confirmed in the Digital Single Market Strategy. In it the Commission has also shown consideration for future directions of EU e-privacy legislation that correspond to earlier expressed initiatives, particularly in the EU electronic communications sector, toward expanding its scope. Such initiatives are prompted by progressive use of relevant online (information society) services and in particular OTT communication services that could be considered functionally equivalent to electronic communication services. In this paper authors legally assess the E-Privacy Directive in particular with respect to its current scope of application, while having in mind the declared aim to ensure equivalent protection of end-users' privacy and data protection rights - regardless of technology used to deliver the relevant service. To that effect they also examine selected e-privacy rules that typically relate to business operations of information society service providers, and other rules characterized by a very close connection to the general data protection framework, which is currently in review. While acknowledging that lacking clarity in Directive's scope may cause divergent transposition and regulatory practices in the EU the authors provide a local perspective on the issue, by analyzing the Croatian legal system implementing the Directive and selected provisions, including regulatory competencies and practice. Where necessary the authors propose local improvements to ensure more clarity and legal certainty for affected businesses and users, as well as general suggestions toward further research on the future of EU e-privacy legislation.
{"title":"Convergence in communications and E-Privacy regulatory challenges, with a local perspective","authors":"Nina Gumzej, Drazen Dragicevic","doi":"10.1109/ConTEL.2015.7231213","DOIUrl":"https://doi.org/10.1109/ConTEL.2015.7231213","url":null,"abstract":"The European Commission announced plans on evaluation of Directive 2002/58/EC (E-Privacy Directive) towards a possible review, but following agreement on the General Data Protection Regulation. Those plans were most recently confirmed in the Digital Single Market Strategy. In it the Commission has also shown consideration for future directions of EU e-privacy legislation that correspond to earlier expressed initiatives, particularly in the EU electronic communications sector, toward expanding its scope. Such initiatives are prompted by progressive use of relevant online (information society) services and in particular OTT communication services that could be considered functionally equivalent to electronic communication services. In this paper authors legally assess the E-Privacy Directive in particular with respect to its current scope of application, while having in mind the declared aim to ensure equivalent protection of end-users' privacy and data protection rights - regardless of technology used to deliver the relevant service. To that effect they also examine selected e-privacy rules that typically relate to business operations of information society service providers, and other rules characterized by a very close connection to the general data protection framework, which is currently in review. While acknowledging that lacking clarity in Directive's scope may cause divergent transposition and regulatory practices in the EU the authors provide a local perspective on the issue, by analyzing the Croatian legal system implementing the Directive and selected provisions, including regulatory competencies and practice. Where necessary the authors propose local improvements to ensure more clarity and legal certainty for affected businesses and users, as well as general suggestions toward further research on the future of EU e-privacy legislation.","PeriodicalId":134613,"journal":{"name":"2015 13th International Conference on Telecommunications (ConTEL)","volume":"37 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114032327","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 : 2015-07-13DOI: 10.1109/ConTEL.2015.7231184
P. Barcik, O. Wilfert, Z. Kolka
The paper deals with numerical modeling of the testbed for measuring the coupling efficiency of the fully photonic receiver for optical wireless communication. The numerical model is based on transformation of the Gaussian beam through optical system described by ray matrices. The design process of the testing transmitter and fully photonic receiver is discussed. Finally the coupling efficiency of the fully photonic receiver is estimated for single-mode fiber.
{"title":"Coupling efficiency estimation of the fully photonic receiver","authors":"P. Barcik, O. Wilfert, Z. Kolka","doi":"10.1109/ConTEL.2015.7231184","DOIUrl":"https://doi.org/10.1109/ConTEL.2015.7231184","url":null,"abstract":"The paper deals with numerical modeling of the testbed for measuring the coupling efficiency of the fully photonic receiver for optical wireless communication. The numerical model is based on transformation of the Gaussian beam through optical system described by ray matrices. The design process of the testing transmitter and fully photonic receiver is discussed. Finally the coupling efficiency of the fully photonic receiver is estimated for single-mode fiber.","PeriodicalId":134613,"journal":{"name":"2015 13th International Conference on Telecommunications (ConTEL)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123892702","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 : 2015-07-13DOI: 10.1109/ConTEL.2015.7231192
Edward Kasem, D. Lekomtcev, R. Maršálek
This paper presents the verification of the developed MATLAB-based simulator for cooperative spectrum sensing using four different real channel conditions set up between the primary and individual secondary users. Indoor-indoor, indoor-outdoor, outdoor-indoor and outdoor-outdoor are taken into consideration. In the transmitter side two types of signals are generated - the analogue FM signal and the digital 8PSK signal. Then these signals are processed using the Universal Software Radio Peripheral (USRP) devices. One of them is defined as a transmitter and another two for the receiver side. Two types of detectors - the energy detector and the Kolmogorov-Smirnov-based statistical detector have been implemented at the receiver for signal sensing evaluation. This system is built to insure the effectiveness of the simulator and cooperative sensing approach not only in simulated channels but also in real ones. Therefore, the achieved results are compared with simulation ones.
{"title":"Cooperative spectrum sensing in real channel conditions","authors":"Edward Kasem, D. Lekomtcev, R. Maršálek","doi":"10.1109/ConTEL.2015.7231192","DOIUrl":"https://doi.org/10.1109/ConTEL.2015.7231192","url":null,"abstract":"This paper presents the verification of the developed MATLAB-based simulator for cooperative spectrum sensing using four different real channel conditions set up between the primary and individual secondary users. Indoor-indoor, indoor-outdoor, outdoor-indoor and outdoor-outdoor are taken into consideration. In the transmitter side two types of signals are generated - the analogue FM signal and the digital 8PSK signal. Then these signals are processed using the Universal Software Radio Peripheral (USRP) devices. One of them is defined as a transmitter and another two for the receiver side. Two types of detectors - the energy detector and the Kolmogorov-Smirnov-based statistical detector have been implemented at the receiver for signal sensing evaluation. This system is built to insure the effectiveness of the simulator and cooperative sensing approach not only in simulated channels but also in real ones. Therefore, the achieved results are compared with simulation ones.","PeriodicalId":134613,"journal":{"name":"2015 13th International Conference on Telecommunications (ConTEL)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121117659","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 : 2015-07-13DOI: 10.1109/ConTEL.2015.7231198
Koichi Nihei, K. Satoda
Since smartphones have spread and the transmission rate of mobile networks has accelerated, a lot of VoIP services are provided on mobile networks. Voice quality degradation due to delay spikes (i.e. sudden large increases in the packet delay) is the key issue for VoIP on mobile networks. To resolve this issue, adaptive jitter buffer control methods have been proposed to deal with delay spikes. These methods control the length of the jitter buffer in order to reduce voice quality degradation due to delay spikes. For further improving the quality of voice communication, it is effective to reduce the number of delay spikes. This paper analyzes the mechanism of delay spikes occurrence and proposes delay spike reduction approaches by controlling size and interval of voice packets on the basis of radio quality. Simulation results on the network simulator (ns-3) show the proposed approaches reduce the number of delay spikes by more than 50%.
{"title":"Study on mechanism and reduction approaches of delay spikes occurrence on mobile networks","authors":"Koichi Nihei, K. Satoda","doi":"10.1109/ConTEL.2015.7231198","DOIUrl":"https://doi.org/10.1109/ConTEL.2015.7231198","url":null,"abstract":"Since smartphones have spread and the transmission rate of mobile networks has accelerated, a lot of VoIP services are provided on mobile networks. Voice quality degradation due to delay spikes (i.e. sudden large increases in the packet delay) is the key issue for VoIP on mobile networks. To resolve this issue, adaptive jitter buffer control methods have been proposed to deal with delay spikes. These methods control the length of the jitter buffer in order to reduce voice quality degradation due to delay spikes. For further improving the quality of voice communication, it is effective to reduce the number of delay spikes. This paper analyzes the mechanism of delay spikes occurrence and proposes delay spike reduction approaches by controlling size and interval of voice packets on the basis of radio quality. Simulation results on the network simulator (ns-3) show the proposed approaches reduce the number of delay spikes by more than 50%.","PeriodicalId":134613,"journal":{"name":"2015 13th International Conference on Telecommunications (ConTEL)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125890591","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 : 2015-07-13DOI: 10.1109/ConTEL.2015.7231208
Avijit Mathur, T. Newe
Different aspects of Wireless sensor networks (WSN) are currently being studied. Some of the important aspects would be clustering, routing and security. This paper looks at the problems arising due to wireless routing between nodes of a medical WSN. Here, the focus is on selective forwarding (SF) attacks. As a solution, we have described a secure routing protocol with test-bed simulation results. This protocol is capable of detecting and correcting the SF attack. The results show that the power consumed during the detection phase is only 152μW more than the power consumed during normal phase.
{"title":"Medical WSN: Power, routing and selective forwarding defense","authors":"Avijit Mathur, T. Newe","doi":"10.1109/ConTEL.2015.7231208","DOIUrl":"https://doi.org/10.1109/ConTEL.2015.7231208","url":null,"abstract":"Different aspects of Wireless sensor networks (WSN) are currently being studied. Some of the important aspects would be clustering, routing and security. This paper looks at the problems arising due to wireless routing between nodes of a medical WSN. Here, the focus is on selective forwarding (SF) attacks. As a solution, we have described a secure routing protocol with test-bed simulation results. This protocol is capable of detecting and correcting the SF attack. The results show that the power consumed during the detection phase is only 152μW more than the power consumed during normal phase.","PeriodicalId":134613,"journal":{"name":"2015 13th International Conference on Telecommunications (ConTEL)","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114910648","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 : 2015-07-13DOI: 10.1109/ConTEL.2015.7231185
M. Shoreh, Reza Ghanaatian, J. Salehi
In this paper, we propose an iterative block equalizer for long-haul Coherent Optical Orthogonal Frequency Division Multiplexing (CO-OFDM) communication systems. The proposed scheme is based on a soft Minimum Mean-Squared Error (MMSE) iterative block equalizer. Two different channel estimation methods are also discussed. The performance and computational complexity of the proposed iterative equalization and channel estimation techniques are evaluated as well. The obtained Bit Error Rate (BER) performance reveal that the iterative equalizer outperforms the linear equalizers by almost two orders of magnitude.
{"title":"Channel estimation and iterative equalization for long-haul coherent optical OFDM communication systems","authors":"M. Shoreh, Reza Ghanaatian, J. Salehi","doi":"10.1109/ConTEL.2015.7231185","DOIUrl":"https://doi.org/10.1109/ConTEL.2015.7231185","url":null,"abstract":"In this paper, we propose an iterative block equalizer for long-haul Coherent Optical Orthogonal Frequency Division Multiplexing (CO-OFDM) communication systems. The proposed scheme is based on a soft Minimum Mean-Squared Error (MMSE) iterative block equalizer. Two different channel estimation methods are also discussed. The performance and computational complexity of the proposed iterative equalization and channel estimation techniques are evaluated as well. The obtained Bit Error Rate (BER) performance reveal that the iterative equalizer outperforms the linear equalizers by almost two orders of magnitude.","PeriodicalId":134613,"journal":{"name":"2015 13th International Conference on Telecommunications (ConTEL)","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115792955","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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