Pub Date : 2019-06-05DOI: 10.1109/ColComCon.2019.8809120
H. Mora, Nathaly Orozco Garzón, F. García, C. de Almeida
Orthogonal frequency division multiple access (OFDMA) has been chosen as the fourth generation (4G) standard and also in the first releases of fifth generation (5G) mobile systems. Unfortunately, OFDMA uses a cyclic prefix that requires an increase in bandwidth and transmission power. In practical systems, there is no need to maintain a bit error rate (BER) lower than that required by a service. Hence, it is possible to reduce the cyclic prefix duration and maintaining an adequate performance. In this sense, in this work, the BER of OFDMA systems that employ a cyclic prefix shorter than the channel delay spread is evaluated. In addition, an antenna array at reception is considered. Diversity signals are combined employing maximal-ratio-combining (MRC). Assuming that noise plus intersymbol interference plus intercarrier interference can be modeled as a zero-mean Gaussian random variable, a closed form expression to calculate the BER for M-QAM modulations is derived. Simulation results show that our theoretical expression behaves as a lower bound, which becomes more accurate as the cyclic prefix duration tends to the channel delay spread.
{"title":"On the Bit Error Rate of OFDMA Employing Short Cyclic Prefix and Maximal Ratio Combining","authors":"H. Mora, Nathaly Orozco Garzón, F. García, C. de Almeida","doi":"10.1109/ColComCon.2019.8809120","DOIUrl":"https://doi.org/10.1109/ColComCon.2019.8809120","url":null,"abstract":"Orthogonal frequency division multiple access (OFDMA) has been chosen as the fourth generation (4G) standard and also in the first releases of fifth generation (5G) mobile systems. Unfortunately, OFDMA uses a cyclic prefix that requires an increase in bandwidth and transmission power. In practical systems, there is no need to maintain a bit error rate (BER) lower than that required by a service. Hence, it is possible to reduce the cyclic prefix duration and maintaining an adequate performance. In this sense, in this work, the BER of OFDMA systems that employ a cyclic prefix shorter than the channel delay spread is evaluated. In addition, an antenna array at reception is considered. Diversity signals are combined employing maximal-ratio-combining (MRC). Assuming that noise plus intersymbol interference plus intercarrier interference can be modeled as a zero-mean Gaussian random variable, a closed form expression to calculate the BER for M-QAM modulations is derived. Simulation results show that our theoretical expression behaves as a lower bound, which becomes more accurate as the cyclic prefix duration tends to the channel delay spread.","PeriodicalId":447783,"journal":{"name":"2019 IEEE Colombian Conference on Communications and Computing (COLCOM)","volume":"151 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121642022","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 : 2019-06-05DOI: 10.1109/ColComCon.2019.8809157
Celso Iwata Frison, Henry Ramiro Carvajal Mora, C. D. Almeida
In 5G wireless networks, the perspective of very large number of simultaneous connections is challenging. In this sense, an overloaded system is a basic scenario of 5G multiple access techniques, that is, the number of active users is greater than the number of system subcarriers. Some schemes of non-orthogonal multiple access (NOMA) have been proposed in the literature and, two of them are compared in this paper. These NOMA techniques are the multi-carrier code division multiple access (MC-CDMA) and sparse code multiple access (SCMA). The performance, in terms of the mean bit error rate, and the decoding complexity, in terms of number of mathematical operations are evaluated. In MC-CDMA, the multi-user maximum likelihood detector (MU-MLD) implemented via sphere decoding (SD) algorithm is considered, which is the optimum receiver, but with polynomially complexity. In SCMA, a near optimal receiver is used, named as message passing algorithm (MPA), which is based on the sum-product algorithm, whose complexity does not depend, directly, on the number of users. Monte Carlo simulations and theoretical expressions are used to compare both multiple access techniques in the uplink of a cellular scenario. Results show that, for an equivalent spectral efficiencies, MC-CDMA performs better than SCMA and SD algorithm is less complex than MPA.
{"title":"MC-CDMA and SCMA Performance and Complexity Comparison in Overloaded Scenarios","authors":"Celso Iwata Frison, Henry Ramiro Carvajal Mora, C. D. Almeida","doi":"10.1109/ColComCon.2019.8809157","DOIUrl":"https://doi.org/10.1109/ColComCon.2019.8809157","url":null,"abstract":"In 5G wireless networks, the perspective of very large number of simultaneous connections is challenging. In this sense, an overloaded system is a basic scenario of 5G multiple access techniques, that is, the number of active users is greater than the number of system subcarriers. Some schemes of non-orthogonal multiple access (NOMA) have been proposed in the literature and, two of them are compared in this paper. These NOMA techniques are the multi-carrier code division multiple access (MC-CDMA) and sparse code multiple access (SCMA). The performance, in terms of the mean bit error rate, and the decoding complexity, in terms of number of mathematical operations are evaluated. In MC-CDMA, the multi-user maximum likelihood detector (MU-MLD) implemented via sphere decoding (SD) algorithm is considered, which is the optimum receiver, but with polynomially complexity. In SCMA, a near optimal receiver is used, named as message passing algorithm (MPA), which is based on the sum-product algorithm, whose complexity does not depend, directly, on the number of users. Monte Carlo simulations and theoretical expressions are used to compare both multiple access techniques in the uplink of a cellular scenario. Results show that, for an equivalent spectral efficiencies, MC-CDMA performs better than SCMA and SD algorithm is less complex than MPA.","PeriodicalId":447783,"journal":{"name":"2019 IEEE Colombian Conference on Communications and Computing (COLCOM)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126797965","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 : 2019-06-05DOI: 10.1109/ColComCon.2019.8809116
Alejandro Escobar Pérez, J. J. Granada Torres
In this paper, Machine Learning (ML) techniques such as k-Nearest Neighbors (KNN), k-Means and Fuzzy c-Means (FCM) are implemented in coherent optical system with DSP-based receiver. Nyquist single carrier optical transmission at 32 Gbaud is simulated in VPIDesignSuite Software in co-simulation with Matlab. Simulations results shows gains up to 1 dB and 2 dB using ML techniques at 50 km of optical link with 100 kHz and 25 kHz of laser linewidth, respectively. Besides, it is demonstrated that ML techniques can be effectively used as a nonsymmetrical demodulation (NSD) method.
{"title":"KNN, k-Means and Fuzzy c-Means for 16-QAM Demodulation in Coherent Optical Systems","authors":"Alejandro Escobar Pérez, J. J. Granada Torres","doi":"10.1109/ColComCon.2019.8809116","DOIUrl":"https://doi.org/10.1109/ColComCon.2019.8809116","url":null,"abstract":"In this paper, Machine Learning (ML) techniques such as k-Nearest Neighbors (KNN), k-Means and Fuzzy c-Means (FCM) are implemented in coherent optical system with DSP-based receiver. Nyquist single carrier optical transmission at 32 Gbaud is simulated in VPIDesignSuite Software in co-simulation with Matlab. Simulations results shows gains up to 1 dB and 2 dB using ML techniques at 50 km of optical link with 100 kHz and 25 kHz of laser linewidth, respectively. Besides, it is demonstrated that ML techniques can be effectively used as a nonsymmetrical demodulation (NSD) method.","PeriodicalId":447783,"journal":{"name":"2019 IEEE Colombian Conference on Communications and Computing (COLCOM)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122325108","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 : 2019-06-05DOI: 10.1109/ColComCon.2019.8809131
Oswaldo René Banda Sayco, A. C. Gordillo
Many studies have focused on the implementation of VLC (Visible Light Communication) systems because it has several advantages compared to RF-based communications systems. However, most authors focus only on one-way communication. This article proposes an uplink communication system based on infrared light and software defined radio. For this purpose, we built analogue interfaces for transmission and reception, which are connected to an USRP (Universal Software Radio Peripheral). Finally, the bit error rate (BER) is measured using GNU Radio software. The obtained BER is 5.33 × 10−5 at a bit rate of 4 Mbps and 160 cm of distance between transmitter and receiver using QPSK modulation.
{"title":"Development of an IR system as an alternative for VLC uplink","authors":"Oswaldo René Banda Sayco, A. C. Gordillo","doi":"10.1109/ColComCon.2019.8809131","DOIUrl":"https://doi.org/10.1109/ColComCon.2019.8809131","url":null,"abstract":"Many studies have focused on the implementation of VLC (Visible Light Communication) systems because it has several advantages compared to RF-based communications systems. However, most authors focus only on one-way communication. This article proposes an uplink communication system based on infrared light and software defined radio. For this purpose, we built analogue interfaces for transmission and reception, which are connected to an USRP (Universal Software Radio Peripheral). Finally, the bit error rate (BER) is measured using GNU Radio software. The obtained BER is 5.33 × 10−5 at a bit rate of 4 Mbps and 160 cm of distance between transmitter and receiver using QPSK modulation.","PeriodicalId":447783,"journal":{"name":"2019 IEEE Colombian Conference on Communications and Computing (COLCOM)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126304227","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 : 2019-06-05DOI: 10.1109/ColComCon.2019.8809143
Jhon A. Lopera, J. J. Granada, A. Cárdenas, J. Zapata
Graphene and 2D materials are being used in the design of light sources due to their wide absorption spectrum, ultrafast recovery time and high modulation depth. In this work, we present a experimental design of an modelocking Erbium-Doped-Fiber-Laser (EDFL) that uses graphene deposited onto D-shaped optical fiber, acting as a saturable absorber, in order to generate ultra-short pulses in an important region for optical communications: 1558.5 nm. To best of our knowledge, this is the first ultrashort pulses laser designed an experimentally validated in Colombia. The results shows a pulsed laser with a repetition rate of 33.3 MHz and a spectral width of 10 nm.
{"title":"Ultrashort Pulse Generation in EDFL Cavities using Graphene as Saturable Absorber for applications in optical communications systems","authors":"Jhon A. Lopera, J. J. Granada, A. Cárdenas, J. Zapata","doi":"10.1109/ColComCon.2019.8809143","DOIUrl":"https://doi.org/10.1109/ColComCon.2019.8809143","url":null,"abstract":"Graphene and 2D materials are being used in the design of light sources due to their wide absorption spectrum, ultrafast recovery time and high modulation depth. In this work, we present a experimental design of an modelocking Erbium-Doped-Fiber-Laser (EDFL) that uses graphene deposited onto D-shaped optical fiber, acting as a saturable absorber, in order to generate ultra-short pulses in an important region for optical communications: 1558.5 nm. To best of our knowledge, this is the first ultrashort pulses laser designed an experimentally validated in Colombia. The results shows a pulsed laser with a repetition rate of 33.3 MHz and a spectral width of 10 nm.","PeriodicalId":447783,"journal":{"name":"2019 IEEE Colombian Conference on Communications and Computing (COLCOM)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129153630","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 : 2019-06-05DOI: 10.1109/ColComCon.2019.8809113
V. Robles-Bykbaev, C. Contreras-Alvarado, L. Matute-Sánchez, E. Lema-Condo, Y. Robles-Bykbaev, P. Suquilanda-Cuesta
According to the UNESCO, the sensitive periods in early brain development occur during the first seven years of children lives. The most relevant areas related to childhood development are the numbers, vision, emotional control, peer social skills, hearing, habitual ways of responding, symbols, and language. For this important reason, in this paper, we present an educational environment aimed at providing a set of tools to contribute to early stimulation of children assisting to low and middle-income schools. Our system relies on mobile apps and stuffed toy robots able to interact with children and other robots to teach several concepts related to early development in both, individual intervention sessions, and group sessions. This tool incorporates a rule-based reasoning expert system to select intervention strategies better. To validate our proposal, we worked with 47 children and a team of experts in the early education area.
{"title":"An educational environment based on stuffed toy robots, mobile apps, and expert systems to provide support in the early development of children","authors":"V. Robles-Bykbaev, C. Contreras-Alvarado, L. Matute-Sánchez, E. Lema-Condo, Y. Robles-Bykbaev, P. Suquilanda-Cuesta","doi":"10.1109/ColComCon.2019.8809113","DOIUrl":"https://doi.org/10.1109/ColComCon.2019.8809113","url":null,"abstract":"According to the UNESCO, the sensitive periods in early brain development occur during the first seven years of children lives. The most relevant areas related to childhood development are the numbers, vision, emotional control, peer social skills, hearing, habitual ways of responding, symbols, and language. For this important reason, in this paper, we present an educational environment aimed at providing a set of tools to contribute to early stimulation of children assisting to low and middle-income schools. Our system relies on mobile apps and stuffed toy robots able to interact with children and other robots to teach several concepts related to early development in both, individual intervention sessions, and group sessions. This tool incorporates a rule-based reasoning expert system to select intervention strategies better. To validate our proposal, we worked with 47 children and a team of experts in the early education area.","PeriodicalId":447783,"journal":{"name":"2019 IEEE Colombian Conference on Communications and Computing (COLCOM)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126534073","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 : 2019-06-01DOI: 10.1109/ColComCon.2019.8809170
L. F. Guerrero-Vásquez, Paul A. Chasi-Pesántez, Renato Castro-Serrano, V. Robles-Bykbaev, J. Bravo-Torres, M. López-Nores
For several years the use of Information and Communication Technologies (ICT) has been questioned as a reason to diminish the social interaction between people. Although, it is not possible to remove ICT from our lives as we depend on them in many aspects, we can adapt them so that their use allows us to improve our social skills. This is the case of the Human-Computer Interface (HCI) and, especially those that involve emotions in a communication with machines similar to human interaction between peers. In this article, the implementation of an HCI based on an intelligent virtual agent is presented, with the possibility of learning basic information about the interlocutor and maintaining a short interaction on topics of general interest. The implementation was made in open-source software, generating not only a tool, but a development platform for other people to make contributions. The virtual agent was evaluated through short sessions with university students, who, according to a survey conducted, showed their acceptance of the interaction process.
{"title":"AVATAR: Implementation of a Human-Computer Interface Based on an Intelligent Virtual Agent","authors":"L. F. Guerrero-Vásquez, Paul A. Chasi-Pesántez, Renato Castro-Serrano, V. Robles-Bykbaev, J. Bravo-Torres, M. López-Nores","doi":"10.1109/ColComCon.2019.8809170","DOIUrl":"https://doi.org/10.1109/ColComCon.2019.8809170","url":null,"abstract":"For several years the use of Information and Communication Technologies (ICT) has been questioned as a reason to diminish the social interaction between people. Although, it is not possible to remove ICT from our lives as we depend on them in many aspects, we can adapt them so that their use allows us to improve our social skills. This is the case of the Human-Computer Interface (HCI) and, especially those that involve emotions in a communication with machines similar to human interaction between peers. In this article, the implementation of an HCI based on an intelligent virtual agent is presented, with the possibility of learning basic information about the interlocutor and maintaining a short interaction on topics of general interest. The implementation was made in open-source software, generating not only a tool, but a development platform for other people to make contributions. The virtual agent was evaluated through short sessions with university students, who, according to a survey conducted, showed their acceptance of the interaction process.","PeriodicalId":447783,"journal":{"name":"2019 IEEE Colombian Conference on Communications and Computing (COLCOM)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126080476","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 : 2019-06-01DOI: 10.1109/ColComCon.2019.8809160
J. Reyes, James Steven Montealegre, Yor Castaño, Christian Urcuqui, Andrés Navarro
Parkinson’s disease (PD) is the fastest growing neurological disorder worldwide. PD has a huge impact on the patients quality life due to motor alterations and behavioral changes. The advancements in low-cost RGB-D cameras, such as MS Kinect®, generates the possibility to use low-cost devices to obtain motion data, and perform common PD test like gait analysis. In this research project, we explore the use of LSTM and one-dimensional convolutional neural network as a complement for clinical PD diagnose, this could be used to help the doctors and specialist in the complex process of objective PD diagnosis. For this, we automatically extracted features and time patterns of these signals, then we performed some deep learning models and as the main result, Conv LSTM model achieved an 83% prediction accuracy, an 83.5% precision, and 83.4% recall, being able to differentiate between PD and Non-PD gait samples.
{"title":"LSTM and Convolution Networks exploration for Parkinson’s Diagnosis","authors":"J. Reyes, James Steven Montealegre, Yor Castaño, Christian Urcuqui, Andrés Navarro","doi":"10.1109/ColComCon.2019.8809160","DOIUrl":"https://doi.org/10.1109/ColComCon.2019.8809160","url":null,"abstract":"Parkinson’s disease (PD) is the fastest growing neurological disorder worldwide. PD has a huge impact on the patients quality life due to motor alterations and behavioral changes. The advancements in low-cost RGB-D cameras, such as MS Kinect®, generates the possibility to use low-cost devices to obtain motion data, and perform common PD test like gait analysis. In this research project, we explore the use of LSTM and one-dimensional convolutional neural network as a complement for clinical PD diagnose, this could be used to help the doctors and specialist in the complex process of objective PD diagnosis. For this, we automatically extracted features and time patterns of these signals, then we performed some deep learning models and as the main result, Conv LSTM model achieved an 83% prediction accuracy, an 83.5% precision, and 83.4% recall, being able to differentiate between PD and Non-PD gait samples.","PeriodicalId":447783,"journal":{"name":"2019 IEEE Colombian Conference on Communications and Computing (COLCOM)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129499686","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 : 2019-06-01DOI: 10.1109/ColComCon.2019.8809118
E. Redrován-Reyes, J. Chalco-Bermeo, V. Robles-Bykbaev, P. Carrera-Hidalgo, C. Contreras-Alvarado, A. León-Pesántez, D. Nivelo-Naula, J. Olivo-Deleg
The language and communication are considered mainstays of cognitive, psychological and emotional development of children. Commonly, during the first four years of life, children make significant progress in learning the language. However, in some cases, there arise delays or differences in patterns of language acquisition, aspects that constitute warnings of developmental problems. For these reasons, in this paper, we describe an educational platform (Pike-Aprende) aimed at supporting the following aspects: a) planning, monitoring, and intervention activities in children (carried out by teachers and Speech and Language Therapists, SLTs), b) automatic design of therapy/stimulation plans for children, and c) supporting the analysis/discrimination of utterances produced by children during sessions. To this aim, we developed a set of tools for web and mobile devices, an expert system for recommending exercises and activities (based on the patient’s profile). With the aim of determining the real feasibility of our proposal, we validated the platform with the support of experts in the initial education program. The experts used the system while developed therapy and stimulation sessions with children. The results show significant progress in several participants (in comparison to traditional therapy).
{"title":"An educational platform based on expert systems, speech recognition, and ludic activities to support the lexical and semantic development in children from 2 to 3 years","authors":"E. Redrován-Reyes, J. Chalco-Bermeo, V. Robles-Bykbaev, P. Carrera-Hidalgo, C. Contreras-Alvarado, A. León-Pesántez, D. Nivelo-Naula, J. Olivo-Deleg","doi":"10.1109/ColComCon.2019.8809118","DOIUrl":"https://doi.org/10.1109/ColComCon.2019.8809118","url":null,"abstract":"The language and communication are considered mainstays of cognitive, psychological and emotional development of children. Commonly, during the first four years of life, children make significant progress in learning the language. However, in some cases, there arise delays or differences in patterns of language acquisition, aspects that constitute warnings of developmental problems. For these reasons, in this paper, we describe an educational platform (Pike-Aprende) aimed at supporting the following aspects: a) planning, monitoring, and intervention activities in children (carried out by teachers and Speech and Language Therapists, SLTs), b) automatic design of therapy/stimulation plans for children, and c) supporting the analysis/discrimination of utterances produced by children during sessions. To this aim, we developed a set of tools for web and mobile devices, an expert system for recommending exercises and activities (based on the patient’s profile). With the aim of determining the real feasibility of our proposal, we validated the platform with the support of experts in the initial education program. The experts used the system while developed therapy and stimulation sessions with children. The results show significant progress in several participants (in comparison to traditional therapy).","PeriodicalId":447783,"journal":{"name":"2019 IEEE Colombian Conference on Communications and Computing (COLCOM)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132437115","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 : 2019-06-01DOI: 10.1109/ColComCon.2019.8809181
Martín Ortega Ortega, Gustavo Chafla Altamirano, Ciro Larco Barros, Mara Falconí Abad
The real values of the technical design parameters that voice codecs possess play a very important role when it is desired to size the bandwidth within a Voice over Internet Protocol (VoIP) communications network, so it is important to know these values. Thus, in the work presented below you get the real values of the most common technical design parameters that have of the voice codecs such as payload, bit rate, Packets Per Second (PPS) and frame size, through the Wireshark software for VoIP monitoring. For this, real VoIP calls were made through softphones applications and using different test scenarios. These applications were installed on smartphones and were configured with Session Initiation Protocol (SIP) accounts, where a set of 8 voice codecs was handled. This was done in order to find out if there are variations between the theoretical and real values of these parameters. The results obtained show that there are differences between these values. It is concluded that by directly using the theoretical bandwidth values of voice codecs, the number of users who could communicate at the same time in a VoIP network with SIP accounts would be oversized.
{"title":"Comparison between the real and theoretical values of the technical parameters of the VoIP codecs","authors":"Martín Ortega Ortega, Gustavo Chafla Altamirano, Ciro Larco Barros, Mara Falconí Abad","doi":"10.1109/ColComCon.2019.8809181","DOIUrl":"https://doi.org/10.1109/ColComCon.2019.8809181","url":null,"abstract":"The real values of the technical design parameters that voice codecs possess play a very important role when it is desired to size the bandwidth within a Voice over Internet Protocol (VoIP) communications network, so it is important to know these values. Thus, in the work presented below you get the real values of the most common technical design parameters that have of the voice codecs such as payload, bit rate, Packets Per Second (PPS) and frame size, through the Wireshark software for VoIP monitoring. For this, real VoIP calls were made through softphones applications and using different test scenarios. These applications were installed on smartphones and were configured with Session Initiation Protocol (SIP) accounts, where a set of 8 voice codecs was handled. This was done in order to find out if there are variations between the theoretical and real values of these parameters. The results obtained show that there are differences between these values. It is concluded that by directly using the theoretical bandwidth values of voice codecs, the number of users who could communicate at the same time in a VoIP network with SIP accounts would be oversized.","PeriodicalId":447783,"journal":{"name":"2019 IEEE Colombian Conference on Communications and Computing (COLCOM)","volume":"186 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126786952","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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