Pub Date : 2019-07-25DOI: 10.1109/WACOWC.2019.8770205
Khadijeh Aalimahmoodi, A. Gholami, Zabih Ghassemlooy
We investigate the effect of camera parameters on the performance of an image sensor or camera based indoor visible light positioning (VLP)system. In this paper, we use 6 light emitting diodes (LEDs)mounted on the ceiling and a camera based receiver for localization and estimate the location using the view angles between LEDs in the image plane. We show that, the accuracy of localization using camera can be affected by the camera parameters such as the lens distortion and the resolution of the image sensor. We also investigate the effect of field of view (FOV)of the camera on the positioning errors for the proposed VLP system.
{"title":"Impact of Camera Parameters on the OCC based Indoor Positioning System","authors":"Khadijeh Aalimahmoodi, A. Gholami, Zabih Ghassemlooy","doi":"10.1109/WACOWC.2019.8770205","DOIUrl":"https://doi.org/10.1109/WACOWC.2019.8770205","url":null,"abstract":"We investigate the effect of camera parameters on the performance of an image sensor or camera based indoor visible light positioning (VLP)system. In this paper, we use 6 light emitting diodes (LEDs)mounted on the ceiling and a camera based receiver for localization and estimate the location using the view angles between LEDs in the image plane. We show that, the accuracy of localization using camera can be affected by the camera parameters such as the lens distortion and the resolution of the image sensor. We also investigate the effect of field of view (FOV)of the camera on the positioning errors for the proposed VLP system.","PeriodicalId":375524,"journal":{"name":"2019 2nd West Asian Colloquium on Optical Wireless Communications (WACOWC)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121964089","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 : 2019-04-28DOI: 10.1109/WACOWC.2019.8770002
Shihe Long, Mohammad Ali Khalighi
We consider the use of carrier-less amplitude and phase (CAP) modulation together with frequency-domain equalization (FDE)for high-speed data transmission in indoor visible-light communication systems and investigate the suitability of this transmission scheme under non-linear LED characteristics, which has to be dealt with in practical implementations of these networks. We focus on the non-linear characteristic of the LED within its dynamic-range, while neglecting the effect of upper signal clipping which has been subject of extensive research so far. The LED is modeled by the Hammerstein model, which consists of a linear time-invariant system followed by a memoryless non-linear part. Through Monte-Carlo simulations we show that, for a given spectral efficiency, the CAP-FDE scheme suffers less from LED non-linearity in terms of electrical power, as compared with the classical DC-biased optical orthogonal-frequency-division-multiplexing.
{"title":"Advantage of CAP Signaling for VLC Systems Under Non-Linear LED Characteristics","authors":"Shihe Long, Mohammad Ali Khalighi","doi":"10.1109/WACOWC.2019.8770002","DOIUrl":"https://doi.org/10.1109/WACOWC.2019.8770002","url":null,"abstract":"We consider the use of carrier-less amplitude and phase (CAP) modulation together with frequency-domain equalization (FDE)for high-speed data transmission in indoor visible-light communication systems and investigate the suitability of this transmission scheme under non-linear LED characteristics, which has to be dealt with in practical implementations of these networks. We focus on the non-linear characteristic of the LED within its dynamic-range, while neglecting the effect of upper signal clipping which has been subject of extensive research so far. The LED is modeled by the Hammerstein model, which consists of a linear time-invariant system followed by a memoryless non-linear part. Through Monte-Carlo simulations we show that, for a given spectral efficiency, the CAP-FDE scheme suffers less from LED non-linearity in terms of electrical power, as compared with the classical DC-biased optical orthogonal-frequency-division-multiplexing.","PeriodicalId":375524,"journal":{"name":"2019 2nd West Asian Colloquium on Optical Wireless Communications (WACOWC)","volume":"140 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123482238","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 : 2019-04-28DOI: 10.1109/WACOWC.2019.8770202
T. Hamza, Mohammad Ali Khalighi
This paper considers the use of Silicon photomultipliers in underwater wireless optical communication systems. We study the limitations arising from the limited bandwidth of these components as well as the solar background noise in relatively shallow waters. In particular, we show the interest of frequency-domain equalization in increasing the link data rate using on-off-keying and pulse-position modulation. Also, for a worst-case scenario, we determine the operation depth (with respect to the receiver)beyond which the link performance is not affected by the solar noise.
{"title":"On Limitations of Using Silicon Photo-Multipliers for Underwater Wireless Optical Communications","authors":"T. Hamza, Mohammad Ali Khalighi","doi":"10.1109/WACOWC.2019.8770202","DOIUrl":"https://doi.org/10.1109/WACOWC.2019.8770202","url":null,"abstract":"This paper considers the use of Silicon photomultipliers in underwater wireless optical communication systems. We study the limitations arising from the limited bandwidth of these components as well as the solar background noise in relatively shallow waters. In particular, we show the interest of frequency-domain equalization in increasing the link data rate using on-off-keying and pulse-position modulation. Also, for a worst-case scenario, we determine the operation depth (with respect to the receiver)beyond which the link performance is not affected by the solar noise.","PeriodicalId":375524,"journal":{"name":"2019 2nd West Asian Colloquium on Optical Wireless Communications (WACOWC)","volume":"110 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127108254","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 : 2019-04-27DOI: 10.1109/WACOWC.2019.8769998
Behnaz Majlesein, A. Gholami, Zabih Ghassemlooy
In underwater optical wireless communications (UOWC)the channel impulse response is essential in characterizing the link. In this paper we investigate the impulse response of the single input multiple output UOWC link using Monte Carlo simulation for different types of waters. We simulate the bit error rate (BER)performance for the proposed intensity modulation direct detection SIMO UOWC links for multiple receivers with a linear combining scheme by considering absorption, scattering, turbulence and all major noise sources. We show that, the clear, coastal and harbor waters display the best to the worth BER performance, respectively.
{"title":"The Channel Impulse Response of SIMO Underwater Optical Wireless Communication Link based on Monte Carlo Simulation","authors":"Behnaz Majlesein, A. Gholami, Zabih Ghassemlooy","doi":"10.1109/WACOWC.2019.8769998","DOIUrl":"https://doi.org/10.1109/WACOWC.2019.8769998","url":null,"abstract":"In underwater optical wireless communications (UOWC)the channel impulse response is essential in characterizing the link. In this paper we investigate the impulse response of the single input multiple output UOWC link using Monte Carlo simulation for different types of waters. We simulate the bit error rate (BER)performance for the proposed intensity modulation direct detection SIMO UOWC links for multiple receivers with a linear combining scheme by considering absorption, scattering, turbulence and all major noise sources. We show that, the clear, coastal and harbor waters display the best to the worth BER performance, respectively.","PeriodicalId":375524,"journal":{"name":"2019 2nd West Asian Colloquium on Optical Wireless Communications (WACOWC)","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115840598","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 : 2019-04-01DOI: 10.1109/WACOWC.2019.8770203
Zahra Nazari Chaleshtori, P. Haigh, P. Chvojka, S. Zvánovec, Zabih Ghassemlooy
This paper evaluates the effect of training algorithms in an artificial neural network (ANN) equalizer for a feedforward multi-layer perceptron configuration in visible light communication systems using a low bandwidth organic light source. We test the scaled conjugate-gradient, conjugate-gradient backpropagation and Levenberg-Marquardt back propagation (LM) algorithms with 5, 10, 20, 30, and 40 neurons. We show that, LM offers superior bit error rate performance in comparison to other training algorithms based on the mean square error. The training methods can be selected based on the trade-off between complexity and performance.
{"title":"Performance Evaluation of Various Training Algorithms for ANN Equalization in Visible Light Communications with an Organic LED","authors":"Zahra Nazari Chaleshtori, P. Haigh, P. Chvojka, S. Zvánovec, Zabih Ghassemlooy","doi":"10.1109/WACOWC.2019.8770203","DOIUrl":"https://doi.org/10.1109/WACOWC.2019.8770203","url":null,"abstract":"This paper evaluates the effect of training algorithms in an artificial neural network (ANN) equalizer for a feedforward multi-layer perceptron configuration in visible light communication systems using a low bandwidth organic light source. We test the scaled conjugate-gradient, conjugate-gradient backpropagation and Levenberg-Marquardt back propagation (LM) algorithms with 5, 10, 20, 30, and 40 neurons. We show that, LM offers superior bit error rate performance in comparison to other training algorithms based on the mean square error. The training methods can be selected based on the trade-off between complexity and performance.","PeriodicalId":375524,"journal":{"name":"2019 2nd West Asian Colloquium on Optical Wireless Communications (WACOWC)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114612143","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 : 2019-04-01DOI: 10.1109/WACOWC.2019.8770211
N. Chaudhary, L. N. Alves, Zabih Ghassemblooy
This paper presents a survey on visible light positioning techniques. The paper briefly reviews conventional positioning methods based on Rx signal strength (RSS), time difference of arrival (TDOA)and angle of arrival (AOA). Then it focus on the current research trends, relying on the machine learning techniques, sensor fusion and communication requirements.
{"title":"Current Trends on Visible Light Positioning Techniques","authors":"N. Chaudhary, L. N. Alves, Zabih Ghassemblooy","doi":"10.1109/WACOWC.2019.8770211","DOIUrl":"https://doi.org/10.1109/WACOWC.2019.8770211","url":null,"abstract":"This paper presents a survey on visible light positioning techniques. The paper briefly reviews conventional positioning methods based on Rx signal strength (RSS), time difference of arrival (TDOA)and angle of arrival (AOA). Then it focus on the current research trends, relying on the machine learning techniques, sensor fusion and communication requirements.","PeriodicalId":375524,"journal":{"name":"2019 2nd West Asian Colloquium on Optical Wireless Communications (WACOWC)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114860656","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 : 2019-04-01DOI: 10.1109/WACOWC.2019.8770195
Hosein Ahmadinejad, A. Falahati, E. Shafiee
Visible Light Communication (VLC)is one of the most efficient way of wireless data transmission that has attracted a number of researchers. In this paper, a simplex VLC system standard employing a Digital Signal Processor (DSP)chipset is implemented. This system is compliant with a physical layer regarding IEEE802.lS.7 PRY1 modes. It is tried to use low-cost hardware with a suitable performance for short distance VLC communication. Bit Error Rate (BER)performance of 4.462Kb/s and 70.92Kb/s is measured at different distances.
{"title":"Design and Implementation of a Visible Light Communication and Coding System Based on IEEE802.15.7 Standard","authors":"Hosein Ahmadinejad, A. Falahati, E. Shafiee","doi":"10.1109/WACOWC.2019.8770195","DOIUrl":"https://doi.org/10.1109/WACOWC.2019.8770195","url":null,"abstract":"Visible Light Communication (VLC)is one of the most efficient way of wireless data transmission that has attracted a number of researchers. In this paper, a simplex VLC system standard employing a Digital Signal Processor (DSP)chipset is implemented. This system is compliant with a physical layer regarding IEEE802.lS.7 PRY1 modes. It is tried to use low-cost hardware with a suitable performance for short distance VLC communication. Bit Error Rate (BER)performance of 4.462Kb/s and 70.92Kb/s is measured at different distances.","PeriodicalId":375524,"journal":{"name":"2019 2nd West Asian Colloquium on Optical Wireless Communications (WACOWC)","volume":"189 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115685612","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 : 2019-04-01DOI: 10.1109/WACOWC.2019.8770196
M. Torabi, Alireza Baghaei Pouri
In this paper, the physical layer (PHY)security performance of a dual-hop cooperative relaying in a cognitive-radio system in the presence of an eavesdropper is investigated. The dual-hop transmission is composed of an asymmetric radio frequency (RF)link and a free space optical (FSO)link. In the considered system, an unlicensed secondary user (SU)uses the spectrum which is shared by a licensed primary user (PU)in a controlled manner to keep the interference at PU receiver, below a predefined value. Furthermore, among $M$ available relays, one relay with the best end-to-end signal-to-noise-ratio (SNR)is selected for transmission. It is assumed that all of the RF links follow Rayleigh fading and all of the FSO links follow Gamma-Gamma distribution. Simulations results for some important security metrics, such as the average secrecy capacity (SC), and secrecy outage probability (SOP)are presented, where some practical issues of FSO links such as atmospheric turbulence, and pointing errors are taken into consideration.
{"title":"Physical Layer Security of a Two-Hop Mixed RF-FSO System in a Cognitive Radio Network","authors":"M. Torabi, Alireza Baghaei Pouri","doi":"10.1109/WACOWC.2019.8770196","DOIUrl":"https://doi.org/10.1109/WACOWC.2019.8770196","url":null,"abstract":"In this paper, the physical layer (PHY)security performance of a dual-hop cooperative relaying in a cognitive-radio system in the presence of an eavesdropper is investigated. The dual-hop transmission is composed of an asymmetric radio frequency (RF)link and a free space optical (FSO)link. In the considered system, an unlicensed secondary user (SU)uses the spectrum which is shared by a licensed primary user (PU)in a controlled manner to keep the interference at PU receiver, below a predefined value. Furthermore, among $M$ available relays, one relay with the best end-to-end signal-to-noise-ratio (SNR)is selected for transmission. It is assumed that all of the RF links follow Rayleigh fading and all of the FSO links follow Gamma-Gamma distribution. Simulations results for some important security metrics, such as the average secrecy capacity (SC), and secrecy outage probability (SOP)are presented, where some practical issues of FSO links such as atmospheric turbulence, and pointing errors are taken into consideration.","PeriodicalId":375524,"journal":{"name":"2019 2nd West Asian Colloquium on Optical Wireless Communications (WACOWC)","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114490095","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 : 2019-04-01DOI: 10.1109/WACOWC.2019.8770214
Himan Savojbolaghchi, Seyed Mohammad Sajad Sadough
Designing robust detection algorithms under weak and strong atmospheric turbulence conditions is one of the main challenges in practical implementation of free-space optical (FSO) communication receivers. In this paper, we propose a blind and fast algorithm based on the generalized maximum likelihood sequence detection (GMLSD) for APD photon-counting receivers without requiring the transmission of training sequence. More precisely, our proposed method achieves a higher spectral and energy efficiency compared to the conventional methods. In addition, the proposed algorithm makes the GMLSD receiver more attractive due to a lower computational complexity. We show through different Monte-Carlo simulation results that by increasing the length of the transmitted sequence, the bit error rate (BER) performance of our proposed Fast GMLSD receiver approaches to that achieved under perfect channel state information (CSI). Finally, we address the effect of the average number of noise photoelectrons and the turbulence strength on the BER performance of the considered FSO system.
{"title":"Fast and Efficient Sequence Detection for APD Photon-Counting FSO Systems","authors":"Himan Savojbolaghchi, Seyed Mohammad Sajad Sadough","doi":"10.1109/WACOWC.2019.8770214","DOIUrl":"https://doi.org/10.1109/WACOWC.2019.8770214","url":null,"abstract":"Designing robust detection algorithms under weak and strong atmospheric turbulence conditions is one of the main challenges in practical implementation of free-space optical (FSO) communication receivers. In this paper, we propose a blind and fast algorithm based on the generalized maximum likelihood sequence detection (GMLSD) for APD photon-counting receivers without requiring the transmission of training sequence. More precisely, our proposed method achieves a higher spectral and energy efficiency compared to the conventional methods. In addition, the proposed algorithm makes the GMLSD receiver more attractive due to a lower computational complexity. We show through different Monte-Carlo simulation results that by increasing the length of the transmitted sequence, the bit error rate (BER) performance of our proposed Fast GMLSD receiver approaches to that achieved under perfect channel state information (CSI). Finally, we address the effect of the average number of noise photoelectrons and the turbulence strength on the BER performance of the considered FSO system.","PeriodicalId":375524,"journal":{"name":"2019 2nd West Asian Colloquium on Optical Wireless Communications (WACOWC)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114393627","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 : 2019-04-01DOI: 10.1109/WACOWC.2019.8769997
Jalal Gholinejad, Kian Jafari, K. Abedi
According to the importance of optical interconnect devices as well as optical logic gates, in this paper a novel approach to utilize the advancements of symmetric and asymmetric plasmonic modes across thin gold film in IMI structure was proposed. This gate may creatively introduce the benefits of plasmonics into commercial photonics, such as: integration of optical circuits, high sensitivity, and high speed. Besides, we propose a novel configuration, modified kretschmann, which via this method the SPPs will be available for electronic detection. Agreeing results, the truth table revealed an XOR interconnect gate; furthermore, ROC and fabrication process also are suggested.
{"title":"Optical XOR Interconnect Gate Based on Symmetric and Asymmetric Plasmonic Modes in IMI Structure Using Modified Kretschmann Configuration","authors":"Jalal Gholinejad, Kian Jafari, K. Abedi","doi":"10.1109/WACOWC.2019.8769997","DOIUrl":"https://doi.org/10.1109/WACOWC.2019.8769997","url":null,"abstract":"According to the importance of optical interconnect devices as well as optical logic gates, in this paper a novel approach to utilize the advancements of symmetric and asymmetric plasmonic modes across thin gold film in IMI structure was proposed. This gate may creatively introduce the benefits of plasmonics into commercial photonics, such as: integration of optical circuits, high sensitivity, and high speed. Besides, we propose a novel configuration, modified kretschmann, which via this method the SPPs will be available for electronic detection. Agreeing results, the truth table revealed an XOR interconnect gate; furthermore, ROC and fabrication process also are suggested.","PeriodicalId":375524,"journal":{"name":"2019 2nd West Asian Colloquium on Optical Wireless Communications (WACOWC)","volume":"318 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115834621","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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