A 2 × 20 Gbps hybrid MDM-OFDM–based high-altitude platform-to-satellite FSO transmission system

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Vel Murugan Gomathy ◽  
T. V. Paramasivam Sundararajan ◽  
C. Sengodan Boopathi ◽  
Pandiyan Venkatesh Kumar ◽  
Krishnamoorthy Vinoth Kumar ◽  
...  
Keyword(s):  
High Altitude ◽  
Orthogonal Frequency Division Multiplexing ◽  
High Speed ◽  
Satellite Communication ◽  
Input Power ◽  
Transmission System ◽  
Communication Link ◽  
Space Optics ◽  
High Altitude Platform ◽  
Mode Division Multiplexing

AbstractIn the present study, the application of free space optics (FSO) transmission system to realize a long-reach high-altitude platform (HAP)-to-satellite communication link has been exploited. High-speed information transmission without interference is accomplished using orthogonal frequency division multiplexing (OFDM). Further, the information capacity of the proposed system is increased by employing mode division multiplexing (MDM). We have investigated the proposed MDM-OFDM-HAP-to-satellite FSO transmission system performance over varying FSO range, diameter of the receiver, pointing errors, and input power. Also, an improved transmission performance of the proposed system using a square root module is reported.

2 × 20 Gbit/s OFDM-based FSO transmission system for HAP-to-ground links incorporating mode division multiplexing with enhanced detection

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Praveen M ◽  
Vasudevan B ◽  
Ransom R
Keyword(s):  
Orthogonal Frequency Division Multiplexing ◽  
High Speed ◽  
Input Power ◽  
Transmission System ◽  
Space Optics ◽  
Mode Division Multiplexing ◽  
Power Divergence ◽  
The Impact ◽  
Root Module

AbstractIn this work, the integration of free-space optics (FSO) technology for implementing long-haul high-altitude platform (HAP)-to-ground transmission system is proposed. Mode division multiplexing (MDM) and orthogonal frequency division multiplexing (OFDM) are incorporated for carrying high-speed signals without interference. The impact of increasing input power, divergence angle, antenna diameter, and attenuation on the system performance is further investigated. In addition, the performance of the MDM-OFDM-HAP-to-ground FSO transmission system is improved by using a square root module at the receiver for link reach enhancement. The results exhibit a reliable transportation of 40 Gbps information over 20 km FSO distance with good quality of the received signal.

scholarly journals ANALISIS PENINGKATAN KAPASITAS SISTEM SELULER 4G LTE PADA SISTEM KOMUNIKASI HIGH ALTITUDE PLATFORM STATION

2017 ◽  
Vol 9 (1) ◽  
pp. 31
Author(s):  
Catur Budi Waluyo ◽  
Yenni Astuti
Keyword(s):  
High Altitude ◽  
Orthogonal Frequency Division Multiplexing ◽  
High Speed ◽  
Elevation Angle ◽  
Coverage Area ◽  
Data Services ◽  
High Altitude Platform ◽  
High Speed Data ◽  
4G Lte ◽  
High Altitude Platform Station

In the development o f wireless communications, to provide high-speed data services and wide bandwidth become a challenge. One technique to make it happen is by using Multicarrier Orthogonal Frequency Division Multiplexing (OFDM) modulation, where in OFDM, frequency selective fading channel effect will be perceived flat fading by each subcarrier. One communication system that supports OFDM technology is Long Term Evolution (LTE) with various types of bandwidth configurations provided. To improve LTE performance in capacity building, coverage area and data rate, it can use multi antenna technique both in receiver and sender, and integrate with High altitude platform station (HAPs) system. In this study the estimation used is Linear Minimum Mean Square (LMMSE). The relationship o f the elevation angle and the K factor is directly proportional, but the elevation angle value is inversely proportional to the diameter o f the HAPs coverage area. In addition, the more the number o f used antennas, the greater the capacity served. Based on the simulation results, the system with estimation can be used to expand the coverage area to 215.77 km which is from 0.032 km in QPSK modulation, speed 60 kmpj with 2x2 antennas.

scholarly journals Time-Varying Communication Channel High Altitude Platform Station Link Budget and Channel Modeling

Information ◽  
2018 ◽  
Vol 9 (9) ◽  
pp. 210
Author(s):  
Xiaoyang Liu ◽  
Hengyang Liu ◽  
Chao Liu ◽  
Ya Luo
Keyword(s):  
High Altitude ◽  
Channel Model ◽  
Channel Modeling ◽  
Link Quality ◽  
Communication Link ◽  
Noise Power ◽  
Golay Code ◽  
High Altitude Platform ◽  
Link Budget ◽  
High Altitude Platform Station

Because of the high BER (Bit Error Rate), low time delay and low channel transmission efficiency of HAPS (High Altitude Platform Station) in the near space. The link budget of HAPS and channel model are proposed in this paper. According to the channel characteristic, the channel model is set up, combined with different CNR (Carrier Noise Ratio), elevation angle, coding situations of wireless communication link by using Hamming code, PSK (Pulse Shift Keying) and Golay code respectively, then the situations of link quality and BER are analyzed. The simulation results show that the established model of the link budget and channel are suitable for the theoretical analysis results. The elevation of the HAPS communication link is smaller while the BER is increasing. The case of channel in the coding is better than in the un-coded situation. When every bit power and thermal noise power spectral density is larger, the BER of the HAPS communication link is becoming smaller.

scholarly journals High Altitude Platform Free Space Optics System Using Various Filtering Operations For Fifth Generation System

2021 ◽  
Author(s):  
Hilal Adnan Fadhil ◽  
SARA RAAD ◽  
hassan ahmed ◽  
median Z. ◽  
Waqas Al-Imitiz
Keyword(s):  
High Altitude ◽  
Free Space ◽  
Simulation Analysis ◽  
Optical Filters ◽  
Free Space Optics ◽  
Optical Channel ◽  
Aperture Diameter ◽  
Space Optics ◽  
High Altitude Platform ◽  
Fifth Generation

Abstract This paper presents high altitude platform free space optics (HAP-FSO) channels using various filtering operations for fifth generation (5G) system. Performance analysis is done utilizing different types of optical filters such as Bessel, Trapezoidal, Gaussian and Rectangular. A comparison is carried out between our proposed scheme and reported counterpart. HAP-FSO performances have been investigated by referring to different factors such as transmission distance, transmitting aperture diameter, beam divergence, transmitter aperture diameter, and receiver diameter. Simulation analysis is carried out in highly recognized software tool called Optisystem to validate the implementation and performance of the proposed system. It is found that the most extreme quality services can be accomplished via utilizing Gaussian optical channel in comparison with distinctive optical channels. Simulation results also confirm the proposed system for error free transmission at bit error rate (BER) of 10-9 for all types of filters at 10Gbps with in favor to Gaussian filter for the same number of users.

2 × 10 Gbit/s–10 GHz Radio over Free Space Optics Transmission System Incorporating Mode Division Multiplexing of Hermite Gaussian Modes

2019 ◽  
Vol 0 (0) ◽  
Author(s):  
Mehtab Singh ◽  
Jyoteesh Malhotra
Keyword(s):  
Free Space ◽  
Transmission System ◽  
Free Space Optics ◽  
Space Optics ◽  
Mode Division Multiplexing ◽  
The Impact

AbstractIn this paper, we report the modeling and simulative investigation of a mode division multiplexing (MDM)-based Radio over Free space optics (RoFSO) transmission system. Two separate 10 Gbit/s–10 GHz information signals are transported successfully over 30 km link range using distinct Hermite Gaussian (HG) modes. Also, the decomposition of distinct modes at the receiver terminal has been reported in this work. Furthermore, the impact of different fog conditions and scintillation effect on the performance of the proposed link has also been discussed in this paper.

Enhanced Performance Analysis of 10 Gbit/s–10 GHz OFDM-Based Radio over FSO Transmission System Incorporating ODSB and OSSB Modulation Schemes

2019 ◽  
Vol 0 (0) ◽  
Author(s):  
Mehtab Singh ◽  
Vigneswaran Dhasarathan
Keyword(s):  
Performance Analysis ◽  
Communication Systems ◽  
Orthogonal Frequency Division Multiplexing ◽  
High Speed ◽  
Low Cost ◽  
Weather Conditions ◽  
Space Optics ◽  
Adverse Weather ◽  
Modulation Schemes ◽  
The Impact

AbstractThe exponential rise in the demand for channel bandwidth over the last few years has lead to the problem of spectrum congestion in conventional radio frequency (RF)-based wireless communication systems. Radio over free space optics (RoFSO) provides an effective solution to tackle the problem of spectrum congestion due to its many merits including license-free bandwidth, quick and low-cost installation, cost-effectiveness, and highly secure transmission links. The high-speed data transmission capabilities and immunity to electromagnetic and RF interference makes it a suitable candidate for the development of future 5 G networks. This work focuses on the designing and performance analysis of 10 Gbit/s–10 GHz orthogonal frequency division multiplexing (OFDM) based RoFSO link under the impact of different environmental effects. Also, the performance of the proposed RoFSO link has been compared for different modulation schemes viz. optical dual sideband (ODSB) and optical single sideband (OSSB). Further, we propose an enhanced detection technique deploying Square root module (SRm) at the receiver terminal for link reach enhancement under the impact of adverse weather conditions.

Hybrid Analog/Digital Modulations Using Polarization Multiplexing OCDMA Scheme in Free Space Optics

2015 ◽  
Vol 764-765 ◽  
pp. 511-514
Author(s):  
Chih Ta Yen ◽  
Chia Yu Liu
Keyword(s):  
Free Space ◽  
Orthogonal Frequency Division Multiplexing ◽  
Multiple Access ◽  
High Speed ◽  
Base Station ◽  
Free Space Optics ◽  
Detection Scheme ◽  
Space Optics ◽  
Polarization Multiplexing ◽  
Code Division Multiple

With the development of the Internet, how to provide a high-speed and high-security comprehensive network has become urgent issue. In this project, we propose hybrid analog/digital transmissions format scheme which integrated optical code-division multiple-access (OCDMA) and polarization multiplexing technique in free space optics (FSO) transmission. Orthogonal frequency division multiplexing (OFDM) transmits as the analog format and (on-off keying) OOK transmits as digital format in the study, respectively. In the proposed hybrid OCDMA system, it has high-speed transmission, signal security and low cost...etc. we adopt quasi-orthogonal Walsh-Hadamard codes (WHC) that with fixed cross correlation value as the codeword for each base station. With the property, the multiple access interference (MAI) can be efficiently eliminated by using the balanced detection scheme at the receive end. The constellation and eye diagrams show that both OFDM signal as analog signal and OOK modulation as digital signal in the proposed hybrid OCDMA system perform good performance in FSO transmission.

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.

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