Abstract Visible-light communications (VLC) is an environmentally friendly optical wireless communication (OWC) technology that operates in the 400–800 THz frequency band. It is currently a critical technology for 5G and 6G wireless indoor applications due to its high data rates, low latency, and superior reliability. Intensity modulated direct detection (IM/DD) is widely used in VLC systems. A channel modulation scheme is designed using L-level pulse modulation techniques such as on–off keying (OOK), amplitude modulation (PAM), position modulation (PPM), and the width modulation (PWM). We introduce a novel hybrid modulation scheme n-M-PAWM based on both PAM and PWM schemes to improve throughput and significantly increase power and spectrum efficiency in VLC communication systems. The performance of our proposed hybrid n-M-PAWM scheme is studied in several aspects, including the number of transmitted bits per symbol, average BER, information rate ratio (IRR), PAPR, bandwidth, and power requirement. In an extremely noisy VLC system, the proposed 2-M-PAWM modulation outperforms both PPWM and PAPM modulation schemes due to its better BER performances. Additionally, we examine the performance of the VLC system in terms of spectral efficiency (SE) using our proposed PAWM-based dimming control system by varying the number of pulses transmitted during one symbol period. We demonstrate through simulation results that our PAWM-based dimming control system performs significantly better compared to the other pulse modulation schemes. All results of this research show that our proposed hybrid PAWM modulation scheme has high potential for VLC technology in indoor and noisy environments.
{"title":"The hybrid pulse amplitude width modulation scheme: high efficiency technique for dimmable VLC systems","authors":"Mohamed El Jbari, Mohamed Moussaoui","doi":"10.1515/joc-2023-0101","DOIUrl":"https://doi.org/10.1515/joc-2023-0101","url":null,"abstract":"Abstract Visible-light communications (VLC) is an environmentally friendly optical wireless communication (OWC) technology that operates in the 400–800 THz frequency band. It is currently a critical technology for 5G and 6G wireless indoor applications due to its high data rates, low latency, and superior reliability. Intensity modulated direct detection (IM/DD) is widely used in VLC systems. A channel modulation scheme is designed using L-level pulse modulation techniques such as on–off keying (OOK), amplitude modulation (PAM), position modulation (PPM), and the width modulation (PWM). We introduce a novel hybrid modulation scheme n-M-PAWM based on both PAM and PWM schemes to improve throughput and significantly increase power and spectrum efficiency in VLC communication systems. The performance of our proposed hybrid n-M-PAWM scheme is studied in several aspects, including the number of transmitted bits per symbol, average BER, information rate ratio (IRR), PAPR, bandwidth, and power requirement. In an extremely noisy VLC system, the proposed 2-M-PAWM modulation outperforms both PPWM and PAPM modulation schemes due to its better BER performances. Additionally, we examine the performance of the VLC system in terms of spectral efficiency (SE) using our proposed PAWM-based dimming control system by varying the number of pulses transmitted during one symbol period. We demonstrate through simulation results that our PAWM-based dimming control system performs significantly better compared to the other pulse modulation schemes. All results of this research show that our proposed hybrid PAWM modulation scheme has high potential for VLC technology in indoor and noisy environments.","PeriodicalId":16675,"journal":{"name":"Journal of Optical Communications","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135878243","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}
Abstract In the recent past, there has been an explosive growth in data traffic within data center systems. This rapid increase in data volume has put significant constraints on the speed of current data communication networks, which are predominantly based on electronic controllers and memory. The speed limitations of electronic devices hinder their ability to process data at higher rates efficiently. To address this issue and enable faster data processing, the use of optical communication emerges as the most promising solution. Optical communication leverages the capabilities of light signals and optical components, which can handle data at much higher rates compared to their electronic counterparts. One key element in optical communication systems is the utilization of fiber delay lines (FDLs) as optical storage for packets. FDLs offer the ability to temporarily store and delay optical signals, providing buffering capabilities within optical networks. These FDLs can be configured in various setups, including feed forward, feed backward, and recirculating configurations, each with its own set of advantages and disadvantages. In this context, this article explores several state-of-the-art arrayed waveguide grating (AWG)-based optical packet switch (OPSW) architectures. These switches are designed to efficiently route and manage optical packets within data center networks. Each architecture is summarized, highlighting its unique features and capabilities. To compare the different AWG-based OPSW architectures, various key parameters are considered, such as the cost, physical losses, bit error rate (BER), and the number of tunable components required. These parameters are critical in determining the performance, efficiency, and cost-effectiveness of the switches.
{"title":"Comparative analysis of optical data center switches","authors":"Amit Sinha, Diwakar Bhardwaj, Vaibhav Shukla","doi":"10.1515/joc-2023-0126","DOIUrl":"https://doi.org/10.1515/joc-2023-0126","url":null,"abstract":"Abstract In the recent past, there has been an explosive growth in data traffic within data center systems. This rapid increase in data volume has put significant constraints on the speed of current data communication networks, which are predominantly based on electronic controllers and memory. The speed limitations of electronic devices hinder their ability to process data at higher rates efficiently. To address this issue and enable faster data processing, the use of optical communication emerges as the most promising solution. Optical communication leverages the capabilities of light signals and optical components, which can handle data at much higher rates compared to their electronic counterparts. One key element in optical communication systems is the utilization of fiber delay lines (FDLs) as optical storage for packets. FDLs offer the ability to temporarily store and delay optical signals, providing buffering capabilities within optical networks. These FDLs can be configured in various setups, including feed forward, feed backward, and recirculating configurations, each with its own set of advantages and disadvantages. In this context, this article explores several state-of-the-art arrayed waveguide grating (AWG)-based optical packet switch (OPSW) architectures. These switches are designed to efficiently route and manage optical packets within data center networks. Each architecture is summarized, highlighting its unique features and capabilities. To compare the different AWG-based OPSW architectures, various key parameters are considered, such as the cost, physical losses, bit error rate (BER), and the number of tunable components required. These parameters are critical in determining the performance, efficiency, and cost-effectiveness of the switches.","PeriodicalId":16675,"journal":{"name":"Journal of Optical Communications","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47629910","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}
Venkata Krishna Odugu, Anita Kulkarni, S. H. Ahammad, M. Hossain, R. T. Prabu, B. Jagan, Ayman Zain Hemadan
Abstract This paper presents the comparative study for performance efficiency of conventional optical transmitter with spatial optical transmitter through coarse wavelength division multiplexed fiber system. The spatial light source mode polar and rectangular configuration are clarified in x directions. The lighted power signal through CWDM fiber system is simulated and measured with the use of conventional and spatial light transmitters. The lighted base band signal through CWDM fiber system is clarified with the use of conventional and spatial light transmitters. The lighted base band signal with spectral wavelength through CWDM fiber system is simulated with the use of conventional and spatial light transmitters. The Q base band signal quality factor and bit error signal rates are studied in the same configuration after receiver photodiode system with the use of conventional and spatial light transmitters.
{"title":"Comparative study for performance efficiency of conventional optical transmitter with spatial optical transmitter through CWDM fiber system","authors":"Venkata Krishna Odugu, Anita Kulkarni, S. H. Ahammad, M. Hossain, R. T. Prabu, B. Jagan, Ayman Zain Hemadan","doi":"10.1515/joc-2023-0229","DOIUrl":"https://doi.org/10.1515/joc-2023-0229","url":null,"abstract":"Abstract This paper presents the comparative study for performance efficiency of conventional optical transmitter with spatial optical transmitter through coarse wavelength division multiplexed fiber system. The spatial light source mode polar and rectangular configuration are clarified in x directions. The lighted power signal through CWDM fiber system is simulated and measured with the use of conventional and spatial light transmitters. The lighted base band signal through CWDM fiber system is clarified with the use of conventional and spatial light transmitters. The lighted base band signal with spectral wavelength through CWDM fiber system is simulated with the use of conventional and spatial light transmitters. The Q base band signal quality factor and bit error signal rates are studied in the same configuration after receiver photodiode system with the use of conventional and spatial light transmitters.","PeriodicalId":16675,"journal":{"name":"Journal of Optical Communications","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41419007","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}
Abstract This paper successfully demonstrates that point-to-point (P2P) superdense wavelength division multiplexing (SDWDM) based on the radio over intersatellite optical wireless communication (Ro-IsOWC) system of 96 channels separated by a 100 GHz bandwidth with 40 GB/s data rate on each stream at a 10,000 km link range has been designed and investigated. The performance of the proposed work has been evaluated by considering the comparison of advanced modulation schemes such as carrier-suppressed return-to-zero (CSRZ), duobinary return-to-zero (DRZ), and modified duobinary return-to-zero (MDRZ) with an optical preamplifier on the bases of bit error rate (BER), quality factor, eye height, and optical signal-to-noise ratio (OSNR) in the clear weather condition. Moreover, the effects of internal parameters such as transceiver aperture diameter and gain of an optical amplifier also have been analyzed with an optimized modulated system. Apart from this, the system performance also has been assessed under varying data rates and OWC frequency ranges with the best-suited modulation format. It has been found that the CSRZ modulation format has shown robust performance and can achieve BER as better as 10−09 with a 5.5 dB quality factor for all wavelengths. It also has been observed that the quality of the received signal deteriorates below an unacceptable value for data rate and link distance beyond 40 GB/s and 10,000 km, respectively.
{"title":"Ultra-long haul high speed 96 × 40 GB/s radio over IsOWC system employing advanced modulation scheme","authors":"Sooraj Parkash","doi":"10.1515/joc-2023-0175","DOIUrl":"https://doi.org/10.1515/joc-2023-0175","url":null,"abstract":"Abstract This paper successfully demonstrates that point-to-point (P2P) superdense wavelength division multiplexing (SDWDM) based on the radio over intersatellite optical wireless communication (Ro-IsOWC) system of 96 channels separated by a 100 GHz bandwidth with 40 GB/s data rate on each stream at a 10,000 km link range has been designed and investigated. The performance of the proposed work has been evaluated by considering the comparison of advanced modulation schemes such as carrier-suppressed return-to-zero (CSRZ), duobinary return-to-zero (DRZ), and modified duobinary return-to-zero (MDRZ) with an optical preamplifier on the bases of bit error rate (BER), quality factor, eye height, and optical signal-to-noise ratio (OSNR) in the clear weather condition. Moreover, the effects of internal parameters such as transceiver aperture diameter and gain of an optical amplifier also have been analyzed with an optimized modulated system. Apart from this, the system performance also has been assessed under varying data rates and OWC frequency ranges with the best-suited modulation format. It has been found that the CSRZ modulation format has shown robust performance and can achieve BER as better as 10−09 with a 5.5 dB quality factor for all wavelengths. It also has been observed that the quality of the received signal deteriorates below an unacceptable value for data rate and link distance beyond 40 GB/s and 10,000 km, respectively.","PeriodicalId":16675,"journal":{"name":"Journal of Optical Communications","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48017740","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}
Parimi Hema Sree, Polavarapu Sushma Chowdary, Chandran Ramesh Kumar, Madhubalan Selvaraju, R. T. Prabu, Rashida Maher Mahmoud, S. H. Ahammad
Abstract This work demonstrated the spatial light sources with various optical wavelength window for high speed broadband optical fiber channel system. 3D signal index polarization configuration is clarified in x direction generated from spatial light transmitter at both wavelength window of 1300 and 1550 nm. Average radial intensity and encircled light flux distribution are simulated together against radius generated from spatial light transmitter at both wavelength window of 1300 and 1550 nm. The degree of polarization and S parameters values are clarified generated from spatial light transmitter for the specified bandwidth 100 GHz at various wavelength window of 1300 and 1500 nm. The signal/noise power amplitude with spectral wavelength through the fiber channel at 1300 and 1500 nm wavelength window. Signal/noise power variations are indicated with time through the fiber channel at both 1550 nm, 1300 wavelength windows. The lighted signal power value is measured through the fiber channel at 1300 and 1550 nm wavelength window. Signal/noise power variations are demonstrated with time and spectral wavelength through PIN photo receiver at 1550 and 1300 nm wavelength window. The electronic signal power value is numerically measured through PIN photo receiver through 1300 and 1550 nm wavelength window. Through various optical wavelength windows of both 1300 and 1550 nm, the electronic signal power quality spectrum is numerically measured through PIN photo receiver.
{"title":"Spatial light sources with various optical wavelength window for high speed broadband optical fiber channel system","authors":"Parimi Hema Sree, Polavarapu Sushma Chowdary, Chandran Ramesh Kumar, Madhubalan Selvaraju, R. T. Prabu, Rashida Maher Mahmoud, S. H. Ahammad","doi":"10.1515/joc-2023-0220","DOIUrl":"https://doi.org/10.1515/joc-2023-0220","url":null,"abstract":"Abstract This work demonstrated the spatial light sources with various optical wavelength window for high speed broadband optical fiber channel system. 3D signal index polarization configuration is clarified in x direction generated from spatial light transmitter at both wavelength window of 1300 and 1550 nm. Average radial intensity and encircled light flux distribution are simulated together against radius generated from spatial light transmitter at both wavelength window of 1300 and 1550 nm. The degree of polarization and S parameters values are clarified generated from spatial light transmitter for the specified bandwidth 100 GHz at various wavelength window of 1300 and 1500 nm. The signal/noise power amplitude with spectral wavelength through the fiber channel at 1300 and 1500 nm wavelength window. Signal/noise power variations are indicated with time through the fiber channel at both 1550 nm, 1300 wavelength windows. The lighted signal power value is measured through the fiber channel at 1300 and 1550 nm wavelength window. Signal/noise power variations are demonstrated with time and spectral wavelength through PIN photo receiver at 1550 and 1300 nm wavelength window. The electronic signal power value is numerically measured through PIN photo receiver through 1300 and 1550 nm wavelength window. Through various optical wavelength windows of both 1300 and 1550 nm, the electronic signal power quality spectrum is numerically measured through PIN photo receiver.","PeriodicalId":16675,"journal":{"name":"Journal of Optical Communications","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45993278","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}
Nadipineni Swathi, Nagajyothi Dimmita, Soman Shibu, Arun Kumar Selvam, Govindaraj Ramkumar, S. H. Ahammad, Omar Karem Omran
Abstract This study clarified the simulation study of the continuous wave light sources with various optical modulators for signal quality optical fiber systems enhancement. The lighted signal power spectrum is measured and tested with various optical modulators after fiber media system. Also the lighted base band modulated signal power value is demonstrated with different light modulators after fiber media system of the reach up to 10 km. The electrical modulated base band signal power value is clarified with various light modulators after receiver PIN system. Moreover, the electrical modulated signal base band power amplitude spectrum quality and data error system rate values are numerically clarified and measured with different light modulators after receiver PIN system. The electro-light modulators that are used namely amplitude, phase, frequency modulators and Mach–Zehnder modulator (MZM).
{"title":"Continuous wave light sources with various optical modulators for signal quality optical fiber systems enhancement","authors":"Nadipineni Swathi, Nagajyothi Dimmita, Soman Shibu, Arun Kumar Selvam, Govindaraj Ramkumar, S. H. Ahammad, Omar Karem Omran","doi":"10.1515/joc-2023-0221","DOIUrl":"https://doi.org/10.1515/joc-2023-0221","url":null,"abstract":"Abstract This study clarified the simulation study of the continuous wave light sources with various optical modulators for signal quality optical fiber systems enhancement. The lighted signal power spectrum is measured and tested with various optical modulators after fiber media system. Also the lighted base band modulated signal power value is demonstrated with different light modulators after fiber media system of the reach up to 10 km. The electrical modulated base band signal power value is clarified with various light modulators after receiver PIN system. Moreover, the electrical modulated signal base band power amplitude spectrum quality and data error system rate values are numerically clarified and measured with different light modulators after receiver PIN system. The electro-light modulators that are used namely amplitude, phase, frequency modulators and Mach–Zehnder modulator (MZM).","PeriodicalId":16675,"journal":{"name":"Journal of Optical Communications","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47249513","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}
Mani Tamilselvi, Ata Kishore Kumar, Dhanalakshmi Ganapathy, Perumal Kalpana Devi, Thandaiah Prabu Ramachandran, Ahmed Ali Zahran, Vasimalla Yesudasu
Abstract In this work, efficient employment of Yb doped multi-mode fiber amplifiers based pumped laser is simulated with advanced light sources in high speed modulated optical communication systems. The total lighted power through measured index multimode fiber based different base band modulation voltages dual drive MZM measured are clarified. The 3D graph of the mode field intensity distribution through measure index multimode fiber is simulated. Total electrical base ban power form through PIN photo-detector based various modulation voltages Dual drive MZM measured are demonstrated. The max Q form factor-min base band BER values through PIN photo-detector based different modulation voltages dual drive MZM measured are also simulated. The electrical base signal form noise ratio varies is simulated and clarified with modulation voltage based dual drive MZM measure varies. The max Q form base band Factor is demonstrated with modulation voltage based dual drive MZM measure varies. Total lighted base power form varies are clarified with modulation voltage based dual drive MZM measure varies. The different measured index multimode fiber characteristics based spatial VCSEL are also clarified and demonstrated.
{"title":"Efficient employment of Yb doped multi-mode fiber amplifiers based pumped laser with advanced light sources in high speed modulated optical communication systems","authors":"Mani Tamilselvi, Ata Kishore Kumar, Dhanalakshmi Ganapathy, Perumal Kalpana Devi, Thandaiah Prabu Ramachandran, Ahmed Ali Zahran, Vasimalla Yesudasu","doi":"10.1515/joc-2023-0206","DOIUrl":"https://doi.org/10.1515/joc-2023-0206","url":null,"abstract":"Abstract In this work, efficient employment of Yb doped multi-mode fiber amplifiers based pumped laser is simulated with advanced light sources in high speed modulated optical communication systems. The total lighted power through measured index multimode fiber based different base band modulation voltages dual drive MZM measured are clarified. The 3D graph of the mode field intensity distribution through measure index multimode fiber is simulated. Total electrical base ban power form through PIN photo-detector based various modulation voltages Dual drive MZM measured are demonstrated. The max Q form factor-min base band BER values through PIN photo-detector based different modulation voltages dual drive MZM measured are also simulated. The electrical base signal form noise ratio varies is simulated and clarified with modulation voltage based dual drive MZM measure varies. The max Q form base band Factor is demonstrated with modulation voltage based dual drive MZM measure varies. Total lighted base power form varies are clarified with modulation voltage based dual drive MZM measure varies. The different measured index multimode fiber characteristics based spatial VCSEL are also clarified and demonstrated.","PeriodicalId":16675,"journal":{"name":"Journal of Optical Communications","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41969120","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}
Abstract The non-orthogonal multiple access (NOMA) multiple access approach can be used in future wireless communication systems to support massive connections and increase spectrum efficiency. Because user signal intensities and interference levels vary, precise channel assessment is essential in NOMA. Optimal power allocation and decoding order are made possible by precise algorithms, increasing system effectiveness and performance. However, NOMA can be adversely impacted by high peak-to-average power ratio (PAPR) values, leading to worsened system performance and more complex power amplifiers. In order to solve this issue, this paper recommends PAPR reduction in NOMA using companding methods for 512, 256, and 64 sub-carriers. Nonlinear companding techniques, such as MA and A-law companding, can efficiently reduce the high peak power of NOMA signals while reducing distortion and enhancing overall system dependability. The effectiveness of the proposed companding methods is evaluated using simulations, and the results demonstrate a significant decrease in PAPR, ensuring higher bit error rate (BER) effectiveness and transmission resilience in NOMA-based communication systems. The proposed approach is compared to the traditional Ml (C- Ml) and A-Law (C- A-Law).
{"title":"A CA and ML approach for M-MIMO optical non-orthogonal multiple access power efficiency","authors":"Arun Kumar, Nidhi Gour, Himanshu Sharma","doi":"10.1515/joc-2023-0194","DOIUrl":"https://doi.org/10.1515/joc-2023-0194","url":null,"abstract":"Abstract The non-orthogonal multiple access (NOMA) multiple access approach can be used in future wireless communication systems to support massive connections and increase spectrum efficiency. Because user signal intensities and interference levels vary, precise channel assessment is essential in NOMA. Optimal power allocation and decoding order are made possible by precise algorithms, increasing system effectiveness and performance. However, NOMA can be adversely impacted by high peak-to-average power ratio (PAPR) values, leading to worsened system performance and more complex power amplifiers. In order to solve this issue, this paper recommends PAPR reduction in NOMA using companding methods for 512, 256, and 64 sub-carriers. Nonlinear companding techniques, such as MA and A-law companding, can efficiently reduce the high peak power of NOMA signals while reducing distortion and enhancing overall system dependability. The effectiveness of the proposed companding methods is evaluated using simulations, and the results demonstrate a significant decrease in PAPR, ensuring higher bit error rate (BER) effectiveness and transmission resilience in NOMA-based communication systems. The proposed approach is compared to the traditional Ml (C- Ml) and A-Law (C- A-Law).","PeriodicalId":16675,"journal":{"name":"Journal of Optical Communications","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45667165","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}
Abstract Cognitive radio (Cr) is one of among the most promising developments, which combines optical non-orthogonal multiple access (O-NOMA) methods to increase the fifth generation (5G) spectrum’s usage efficiency. In this work, we provide a hybrid approach based on cyclic stationary feature detection (CFD) and energy detection (ED). The probability of false alarm (PFA), on which it is based, is used to choose which spectrum sensing (SS) approach to use. When PFA is less than 0.5, the ED is chosen; otherwise, the MF is. The suggested detection method in O-NOMA is investigated using Matlab-2016 simulation with reference to several metrics, such as bit error rate (BER), signal-to-noise ratio (SNR), probability of detection (PD), and PFA.
{"title":"Improving and analysing the spectral access performance of QAM-64 optical NOMA using a hybrid ED-CSD algorithm","authors":"Arun Kumar, Nishant Gaur, S. Chakravarti","doi":"10.1515/joc-2023-0217","DOIUrl":"https://doi.org/10.1515/joc-2023-0217","url":null,"abstract":"Abstract Cognitive radio (Cr) is one of among the most promising developments, which combines optical non-orthogonal multiple access (O-NOMA) methods to increase the fifth generation (5G) spectrum’s usage efficiency. In this work, we provide a hybrid approach based on cyclic stationary feature detection (CFD) and energy detection (ED). The probability of false alarm (PFA), on which it is based, is used to choose which spectrum sensing (SS) approach to use. When PFA is less than 0.5, the ED is chosen; otherwise, the MF is. The suggested detection method in O-NOMA is investigated using Matlab-2016 simulation with reference to several metrics, such as bit error rate (BER), signal-to-noise ratio (SNR), probability of detection (PD), and PFA.","PeriodicalId":16675,"journal":{"name":"Journal of Optical Communications","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49140074","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}
Abstract White LEDs attract researchers for indoor visible light communication systems due to their good modulation characteristics, high efficiency, long lifetime, low cost, high tolerance to humidity, low power consumption, and minimal heat generation. Major challenges need to be resolved for LEDs including signal attenuation, ISI, and limited bandwidth for the proliferation of VLC systems. In this work, the challenges of signal attenuation and efficient utilization of limited bandwidth are addressed, keeping in mind the cost factor. A commercial high-power white phosphorous-coated LED with an optical preamplifier is used for a spectrally efficient 16 QAM Radio-Over-VLC link. The effect of varying the preamplifier gain on the system performance is investigated. Lower gain values limit the communication distance of the VLC system. A maximum transmission distance of 7 m considering a super-forward-error-correction (SFEC) limit of 1.863 × 10−2 could be achieved for a data rate of 0.5 Gbps. The transmission distance needs to be reduced to 6 m for a higher data rate of 0.6 Gbps with a resultant bit-error-ratio (BER) of 1.44 × 10−2 which is well within the SFEC limit. The achieved error vector magnitude (EVM), symbol error rate (SER), and Log bit-error-ratio (BER) metrics are used to characterize the VLC system performance.
{"title":"Implementation of 16 QAM signal transmission over RO-VLC system using high power LEDs","authors":"R. Paliwal, P. Patel, A. Atieh","doi":"10.1515/joc-2023-0098","DOIUrl":"https://doi.org/10.1515/joc-2023-0098","url":null,"abstract":"Abstract White LEDs attract researchers for indoor visible light communication systems due to their good modulation characteristics, high efficiency, long lifetime, low cost, high tolerance to humidity, low power consumption, and minimal heat generation. Major challenges need to be resolved for LEDs including signal attenuation, ISI, and limited bandwidth for the proliferation of VLC systems. In this work, the challenges of signal attenuation and efficient utilization of limited bandwidth are addressed, keeping in mind the cost factor. A commercial high-power white phosphorous-coated LED with an optical preamplifier is used for a spectrally efficient 16 QAM Radio-Over-VLC link. The effect of varying the preamplifier gain on the system performance is investigated. Lower gain values limit the communication distance of the VLC system. A maximum transmission distance of 7 m considering a super-forward-error-correction (SFEC) limit of 1.863 × 10−2 could be achieved for a data rate of 0.5 Gbps. The transmission distance needs to be reduced to 6 m for a higher data rate of 0.6 Gbps with a resultant bit-error-ratio (BER) of 1.44 × 10−2 which is well within the SFEC limit. The achieved error vector magnitude (EVM), symbol error rate (SER), and Log bit-error-ratio (BER) metrics are used to characterize the VLC system performance.","PeriodicalId":16675,"journal":{"name":"Journal of Optical Communications","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66990294","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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