Simulative Investigation on the Effect of Different Parameters on the Performance of IsOWC System

2017 ◽  
Vol 38 (3) ◽  
Author(s):  
Mehtab Singh
Keyword(s):  
Communication Systems ◽  
Satellite Communication ◽  
Communication Link ◽  
Optical Wireless ◽  
Antenna Aperture ◽  
Aperture Diameter ◽  
Pointing Errors ◽  
Signal Degradation ◽  
Communication Links ◽  
Radio Frequency Signals

AbstractInter-satellite communication links are very crucial between satellites orbiting around the earth in order to transmit information between them and also for the purpose of data relaying from one satellite station to other stations and ground stations. Inter-satellite optical wireless communication (IsOWC) links involve the application of optical wireless signals as compared to radio frequency signals used in traditional satellite communication systems. One of the major problems leading to the performance degradation of IsOWC link is the signal degradation due to satellite vibrations also known as pointing errors. In this paper, the performance of an IsOWC communication link has been investigated for different system parameters such as data transmission rates, antenna aperture diameter, transmission power levels, operating wavelength and responsivity of photodiode by analyzing

Impact of Various Parameters on the Performance of Inter-aircraft Optical Wireless Communication Link

2017 ◽  
Vol 39 (1) ◽  
Author(s):  
Mehtab Singh
Keyword(s):  
Wireless Communication ◽  
Transmission Rate ◽  
Power Level ◽  
Communication Link ◽  
Optical Wireless Communication ◽  
Optical Wireless ◽  
Antenna Aperture ◽  
Aperture Diameter ◽  
Pointing Error ◽  
The Impact

AbstractOptical wireless communication (OWC) systems also known as Free space optics (FSO) are capable of providing high channel bandwidth, high data transmission rates, low power consumption, and high security. OWC links are being considered in different applications such as inter-satellite links, terrestrial links, and inter-aircraft communication links. This paper investigates the impact of different system parameters such as transmission power level, operating wavelength, transmitter pointing error angle, bit transmission rate, atmospheric attenuation, antenna aperture diameter, geometric losses, the responsivity of the photodetector, and link range on the performance of inter-aircraft optical wireless communication link.

scholarly journals Analysis of Time Diversity Gain for Satellite Communication Link based on Ku-Band Rain Attenuation Data Measured in Malaysia

2018 ◽  
Vol 8 (4) ◽  
pp. 2608
Author(s):  
Islam Md. Rafiqul ◽  
Ali Kadhim Lwas ◽  
Mohamed Hadi Habaebi ◽  
Md Moktarul Alam ◽  
Jalel Chebil ◽  
...  
Keyword(s):  
Satellite Communication ◽  
Satellite Communications ◽  
Earth Satellite ◽  
Rain Attenuation ◽  
Diversity Gain ◽  
Communication Link ◽  
Time Diversity ◽  
Communication Links ◽  
System Time ◽  
Diversity Technique

<p><span>This paper reports a study on mitigation of propagation impairments on Earth–space communication links. The study uses time diversity as a technique for mitigating rain propagation impairment in order to rectify rain fade. Rain attenuation time series along earth-to-satellite link were measured for two years period at 12.255 GHz in Malaysia. The time diversity technique was applied on measured rain fade to investigate the level of possible improvement in system. Time diversity gain from measured one-minute rain attenuation for two years period was estimated and significant improvement was observed with different delays of time. These findings will be utilized as a useful tool for link designers to apply time diversity as a rain fade mitigation technique in Earth-satellite communications systems.</span></p>

Numerical modelling of relative intensity noise (RIN) transfer as a result of four-wave mixing in optical communication links

2019 ◽  
pp. 4-13
Author(s):  
Тимофей Михайлович Федотенко ◽  
Анастасия Евгеньевна Беднякова
Keyword(s):  
Optical Communication ◽  
Relative Intensity ◽  
Signal Propagation ◽  
Four Wave Mixing ◽  
Relative Intensity Noise ◽  
Communication Link ◽  
Wave Mixing ◽  
Intensity Noise ◽  
Signal Degradation ◽  
Communication Links

Выполнено исследование распространения сигнала в волоконной линии связи с сонаправленной накачкой. Несмотря на невозможность переноса шумов из накачки в сигнал в результате вынужденного комбинационного рассеяния (ВКР), в натурном эксперименте наблюдается деградация сигнала уже при небольших длинах распространения (порядка 5-10 км). Для исследования причин деградации сигнала построена численная модель на основе обобщенного нелинейного уравнения Шрёдингера, учитывающая дисперсию высших порядков, керровскую нелинейность и запаздывающий рамановский отклик среды. Также используется более реалистичная модель многомодового источника накачки. В результате проведенного численного анализа продемонстрировано, что в определенных условиях не только ВКР, но и четырехволновое смешение может инициировать в линиях связи процесс переноса шумов из накачки в сигнал. It is well known that any real transmission link introduces distortions into the signal that can be either recoverable or not fully removable. The sources of such unremovable distortions leading to the loss of information are double Rayleigh scattering, amplified spontaneous emission, RIN (Relative Intensity Noise) transfer and nonlinear interactions such as four-wave mixing. In this paper we perform numerical investigation of signal propagation and RIN transfer in optical communication link with co-propagating pump. Despite the impossibility of intensity noise transfer from pump to signal due to stimulated Raman scattering (SRS), in the experiment signal degradation is observed even at small propagation lengths of 5-10 km. To find the origin of signal degradation, a numerical model is proposed based on the generalized nonlinear Schr¨odinger equation. The model takes into account the higher-order dispersion, Kerr nonlinearity, and the delayed Raman response of the medium. A more realistic model of the multimode pumping source is also employed. It is worth noting, that the most common analytical and numerical models, describing RIN transfer from pump to signal, are based on balance equations and neglects influence of dispersive and nonlinear effects. As a result of the numerical analysis, it was demonstrated that not only SRS but also four-wave mixing can initiate the process of noise transfer from pump to signal in the communication links.

Accurate Characterization of Raindrop Size on the Performance of Optical Wireless Communication Links

2014 ◽  
Vol 666 ◽  
pp. 317-321
Author(s):  
Stephen Kotiang ◽  
Jae Ho Choi
Keyword(s):  
Wireless Communication ◽  
Communication Systems ◽  
Rain Attenuation ◽  
Optical Signal ◽  
Accurate Estimation ◽  
Communication Link ◽  
Optical Wireless Communication ◽  
Optical Wireless ◽  
Optical Extinction ◽  
Raindrop Size

Rain attenuation is one of the impairments on the performance of optical wireless communication systems, and an accurate estimation of optical extinction coefficient due to rain in an area is an important factor for setting up a reliable communication link. In this paper, a relationship between optical signal attenuation and rain intensity is derived based on the moment of method of raindrop size distribution using a three-parameter gamma model. Finally, analyticalresultsarecompared to those ofthe ITU-R model.

Influence of Transmitting Pointing Errors on High Speed WDM-AMI-Is-OWC Transmission System

2017 ◽  
Vol 39 (1) ◽  
Author(s):  
Abdallah Ahmad Shatnawi ◽  
Mohd Nazri Bin Mohd Warip ◽  
Anuar Mat Safar
Keyword(s):  
Wavelength Division Multiplexing ◽  
Data Transmission ◽  
Communication Systems ◽  
High Speed ◽  
Satellite Communication ◽  
Signal To Noise Ratio ◽  
Transmission System ◽  
Eye Diagram ◽  
Satellite Link ◽  
Pointing Errors

AbstractInter-satellite communication is one of the revolutionary techniques that can be used to transmit the high speed date between satellites. However, space turbulences such as transmitting pointing errors play a significant role while designing inter-satellite communication systems. Those turbulences cause shutdown of inter-satellite link due to increase of attenuation during data transmission through link. The present work aims to develop an integrated data transmission system incorporating alternate mark inversion (AMI), wavelength division multiplexing (WDM), and polarization interleaving (PI) scheme for transmitting data 160 Gbps over inter-satellite link of 1,000 km under the influence of space turbulences. The performance of the integrated data transmission of 160 Gbps data up to 1,000 km will be evaluated under the influence of space turbulences by means of signal to noise ratio (SNR), total received power, bit error rate and eye diagram.

scholarly journals Reconfigurable Intelligent Surface-Assisted Bluetooth Low Energy Link in Metal Enclosure

2021 ◽  
Vol 2 ◽  
Author(s):  
Mir Lodro ◽  
Gabriele Gradoni ◽  
Jean-Baptiste Gros ◽  
Steve Greedy ◽  
Geoffroy Lerosey
Keyword(s):  
Communication Systems ◽  
Local Area ◽  
Low Energy ◽  
Packet Error Rate ◽  
Neighbor Discovery ◽  
Communication Link ◽  
Bluetooth Low Energy ◽  
Sixth Generation ◽  
Data Rates ◽  
Communication Links

Reconfigurable intelligent surface (RIS) technology is at the forefront for its transformative role in future wireless communication systems such as wireless local area networks (WLAN), sixth-generation (6G) communication, and internet-of-things (IoT). This paper presents RIS-assisted Bluetooth low energy (BLE) communication links in neighbor discovery mode. We optimized the packet error rate (PER) performance of the BLE communication link in a highly reflecting metal enclosure environment. We used one RIS for the PER optimization of four BLE physical (PHY) modes. Then, we used two RISs simultaneously in a distributed and centralized manner to further optimize the PER of all BLE PHY modes. We found PER optimization using two RISs is better than the PER optimization using one RIS. Additionally, PER optimization using a centralized arrangement of RISs outperformed PER optimization using distributed arrangement. We found the coded BLE modes i.e., LE500K and LE125K show lower PER than the uncoded counterpart i.e., LE1M and LE2M. This is because uncoded BLE PHY modes have higher data rates than the coded BLE PHY modes. Because of additional channel power gains introduced by RIS-based passive beamforming, the PER of coded and uncoded BLE PHY modes is further reduced.

scholarly journals Potential Benefits of Dynamic Beam Synthesis to Mobile Satellite Communication, Using the Inmarsat 4 Antenna Architecture as a Test Example

2009 ◽  
Vol 2009 ◽  
pp. 1-5 ◽  
Author(s):  
R. F. E. Guy
Keyword(s):  
Communication Systems ◽  
Satellite Communication ◽  
High Gain ◽  
Significant Loss ◽  
Pointing Errors ◽  
Antenna Performance ◽  
Potential Benefits ◽  
Spatial Isolation ◽  
Mobile Satellite ◽  
Mobile Satellite Communication

Present mobile satellite communication systems use large antennas to provide multiple high-gain beams. Each beam covers a fixed geographic cell on the earth. Spatial frequency reuse is provided by synthesising beams with low-power levels over all cells operating at the same frequency. The performance needs for future systems are steadily increasing, leading to higher-gain requirements, which are met by using larger antennas with narrower beams. So the antenna pointing errors become a significant loss factor. An alternative approach is to abandon the use of fixed beams and dynamically synthesise the beams to optimise the antenna performance in real time. This both increases user gain and lowers cofrequency interference whilst also reducing the effects of pointing errors. Simulations, using the Inmarsat 4 antenna architecture as a test example, show that the spatial isolation performance can be significantly improved by using Dynamic Beam Synthesis.

Modeling and Performance Analysis of 10 Gbps Inter-satellite Optical Wireless Communication Link

2017 ◽  
Vol 39 (1) ◽  
Author(s):  
Mehtab Singh
Keyword(s):  
Performance Analysis ◽  
Wireless Communication ◽  
Optical Fiber ◽  
Satellite Communication ◽  
Optical Fiber Communication ◽  
Communication Link ◽  
Optical Wireless Communication ◽  
Optical Wireless ◽  
Fiber Communication ◽  
And Performance

AbstractFree-space optical (FSO) communication has the advantages of two of the most predominant data transmission technologies – optical fiber communication and wireless communication. Most of the technical aspects of FSO are similar to that of optical fiber communication, with major difference in the information signal propagation medium which is free space in case of FSO rather than silica glass in optical fiber communication. One of the most important applications of FSO is inter-satellite optical wireless communication (IsOWC) links which will be deployed in the future in space. The IsOWC links have many advantages over the previously existing microwave satellite communication technologies such as higher bandwidth, lower power consumption, low cost of implementation, light size, and weight. In this paper, modeling and performance analysis of a 10-Gbps inter-satellite communication link with two satellites separated at a distance of 1,200 km has been done using OPTISYSTEM simulation software. Performance has been analyzed on the basis of quality factor, signal to noise ratio (SNR), and total power of the received signal.

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