Performance of OFDM-FSO Communication System with Different Modulation Schemes over Gamma-Gamma Turbulence Channel

Ajewole, Bukola D.; Odeyemi, Kehinde O.; Owolawi, Pius A.; Srivastava, Viranjay M.

doi:10.12720/jcm.14.6.490-497

Cited by 6 publications

(6 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Panda and Bhanja (2021) reported an improved performance evaluation of OFDM-FSO scheme by designing a modified OFDM receiver. In the previous works reported in (Sharma, 2014;Patel et al, 2014;Nistazakis et al, 2016;Attri et al, 2017;Zhang et al, 2018;Ajewole et al, 2019;Gupta et al, 2019;Hario et al, 2019;Darwesh and Kopeika, 2020;Panda and Bhanja, 2021) single-channel OFDM transmission has been discussed over free-space channel. Further enhancement of transmission capacity of FSO can be achieved by employing more OFDM channels transmission simultaneously which can be achieved using Wavelength-Division Multiplexed (WDM) transmission.…”

Section: Literature Surveymentioning

confidence: 99%

“…The authors reported that as the laser power increases, the transmission performance under turbulent conditions improves. Ajewole et al (2019) reported the comparative investigation of Binary Phase-Shift Keying (BPSK) modulation scheme and 64-level Quadrature-Amplitude Modulation (64-QAM) scheme in an OFDM-FSO transmission under varying gamma-gamma turbulence conditions. The authors reported that deteriorating turbulent conditions degrades the systems' performance and demonstrated that BPSK has a better transmission performance than 64-QAM.…”

Section: Literature Surveymentioning

confidence: 99%

See 1 more Smart Citation

Investigations on Orthogonal-Frequency Division Multiplexed-Mode-Division Multiplexed MM Wave-on-Free Space Optics Transmission using Laguerre-Gaussian Modal Beams

Suman¹,

Kumar²

2021

Journal of Computer Science

View full text Add to dashboard Cite

We report the simulation-modelling and evaluation of an integrated Orthogonal-Frequency Division Multiplexed (OFDM)-Mode-Division Multiplexed (MDM) Radio-on-Free Space Optics (Ro-FSO) scheme carrying 2-independent 40 GHz millimetre waves (mm Wave) at 20 Gbps per channel for 5 th generation wireless applications. The reported Ro-FSO scheme transports 2-independent 20 Gbps 4-Quadrature-Amplitude Modulated (4-QAM) signals, each carrying 40 GHz mm Wave signal over 2-distinct Laguerre-Gaussian (LG) modal beams and their performance evaluation is carried out for varying levels of clear and foggy weather. Also, we have taken into consideration the effect of increasing size of optical beam signal on the reported scheme performance. The reported results elucidate favourable transportation of both mm Wave signals along 40 km range for clear sky and 1.5 km for heavy-foggy weather.

show abstract

Section: Literature Surveymentioning

confidence: 99%

Section: Literature Surveymentioning

confidence: 99%

Investigations on Orthogonal-Frequency Division Multiplexed-Mode-Division Multiplexed MM Wave-on-Free Space Optics Transmission using Laguerre-Gaussian Modal Beams

Suman¹,

Kumar²

2021

Journal of Computer Science

View full text Add to dashboard Cite

show abstract

“…BPSK and Quadrature Amplitude Modulation (M-array QAM) have been proposed as the modulation schemes to be used over the FSOC system. As BPSK and M-QAM require no adaptive threshold schemes, therefore they offer better performance when compared to other modulation schemes under the same atmospheric turbulence thresholds [33].…”

Section: Modulationmentioning

confidence: 99%

“…According to [33], BPSK performs better in all turbulence conditions compared to QAM [34], [35] because the error performance and distortion worsen with an increase in the modulation order. BPSK and QPSK modulation schemes are adopted in our design.…”

Section: Modulationmentioning

confidence: 99%

Modulated Retro-Reflector-Based Physical-Layer Network Coding for Space Optical Communications

et al. 2021

View full text Add to dashboard Cite

We propose a Modulated Retro-Reflector (MRR) based Physical-Layer Network Coding (PNC) framework for space two-way relay (TWR) optical communications. MRR PNC simplifies the end node's design by replacing pointing, acquisition and tracking mechanisms which require large size, weight, and power (SWaP) consumption. Each end node modulates its data on top of the interrogating beam from the relay node so that the two end nodes' frequencies are synchronized and there is no carrier frequency offset between the two end nodes and the relay. However, the transmitted signal based on the interrogating beam and twice the channel fading leads to noise aggregation. We analyze the impact of this noise aggregation by deriving the bit error rate (BER) for MRR PNC and performing simulations in Gamma-Gamma fading channels. The simulation results show that MRR PNC has a 3 dB optical signal noise ratio penalty compared with MRR "point-to-point" systems. The overall system throughput of MRR PNC is 99% higher than the traditional non-network-coded scheme in the ≥ 6 dB (for BPSK, ≥ 9 dB for QPSK) signal noise ratio regime. We propose using low-density parity-check (LDPC) codes to mitigate the problem of the degradation of the BER caused by the noise aggregation in MRR PNC. Our simulation results show that a rate 1/2 LDPC code can achieve 2 dB coding gain on BER 10 −3 . We show that the asynchrony penalty is 3 dB on BER 10 −3 compared with a synchronous system. The implication is that when channel coding is used, the system can still work. Our findings show that MRR PNC can double the system throughput while keeping low values of SWaP, is feasible for space TWR optical communications.

show abstract

“…Due to the increase in space engineering projects and tasks, the complexity of modulation formats in satellite laser communication systems is increasing in order to meet the needs of different users and services and make full use of channel capacity [1][2][3][4][5][6][7]. To expand transmission capacity, the Optical Frequency Division Multiplexing (OFDM) technique has attracted attention, and the OFDM system was found to be highly resistant to multipath interference and spectrally selective fading as well as having good BER performance [8][9][10][11][12][13][14][15]. To meet the requirements of high-speed data transmission in satellite laser communication systems, the OFDM technique can improve the transmission rate and reliability of the system.…”

Section: Introductionmentioning

confidence: 99%

Multi-Carrier Signal Recognition Method Based on Multi-Feature Input and Hybrid Training Neural Network

Cui

Zhang

et al. 2022

Electronics

View full text Add to dashboard Cite

In order to achieve automatic identification of modulation formats in orthogonal frequency division multiplexing (OFDM) subcarrier signals, a recognition method based on multiple feature inputs and a Hybrid Training Neural Network (HTNN) is proposed, in which an HTNN structure is designed to obtain high-order statistical correlation features and constellations of OFDM subcarriers. The recognition performance of the proposed method in free space channel transmission and atmospheric time-varying channel transmission is studied by simulation. Simulation results show that the overall identification accuracy of the recognition model based on the proposed method exceeded 93.37% in the wide Signal-to-Noise Ratio (SNR) range of the free space channel. With an SNR higher than 7.5 dB, identification accuracy performance of the learning model culminated, achieving 100% identification accuracy of OFDM subcarrier signals. Under weak turbulent atmospheric and time-varying channel conditions, the overall identification accuracy curve tended to increase as SNR increased and stabilized at more than 95%. Compared with the two comparison methods, the proposed method reduced the sensitivity to channel variations and improved the convergence speed on the basis of the guaranteed identification accuracy, and enabled reliable identification of OFDM subcarrier signals in a wide SNR range.

show abstract

Performance of OFDM-FSO Communication System with Different Modulation Schemes over Gamma-Gamma Turbulence Channel

Cited by 6 publications

References 20 publications

Investigations on Orthogonal-Frequency Division Multiplexed-Mode-Division Multiplexed MM Wave-on-Free Space Optics Transmission using Laguerre-Gaussian Modal Beams

Investigations on Orthogonal-Frequency Division Multiplexed-Mode-Division Multiplexed MM Wave-on-Free Space Optics Transmission using Laguerre-Gaussian Modal Beams

Modulated Retro-Reflector-Based Physical-Layer Network Coding for Space Optical Communications

Multi-Carrier Signal Recognition Method Based on Multi-Feature Input and Hybrid Training Neural Network

Contact Info

Product

Resources

About