Bit error rate analysis with real-time pointing errors correction in free space optical communication systems

Liu, Wei; Shi, Wenxiao; Cao, Jingtai; Lv, Yaowen; Yao, Kainan; Wang, Shuai; Wang, Jihong; Chi, Xuefen

doi:10.1016/j.ijleo.2013.06.043

Cited by 26 publications

(10 citation statements)

References 29 publications

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“…The experiment is conducted in an indoor laboratory setup consisting of a controlled (man-made) turbulence simulation box. The digital signal processor (DSP) is jointly used with FPGA to generate the beam steering control signal [9]. F. Gago et al have explained the tip-tilt mirror control based on the FPGA technology for adaptive optics system and reported that the FPGA is the best viable platform for the control process when a huge amount of parallel processing is needed.…”

Section: Background and Related Workmentioning

confidence: 99%

“…A serial pseudorandom binary sequence (PRBS) generator circuit of 2 10 -1 is developed in the FPGA, and its bit stream output is given to the optical modulator at the asynchronous transfer mode (ATM) rate of 155 Mbps. A widely used UNRZ-OOK-IM-DD scheme, with a UNRZ signal of 0 V (low) for logic '0' and 3.3 V (high) for logic '1' , is used to directly modulate the optical signal [4,7,9,10,23]. The modulated light is made to fall on the optical shaker and gets reflected towards the transmitting optics.…”

Section: Fsoc Experimental Test-bed Configuration and Control Strategmentioning

confidence: 99%

“…In addition, a photonics-based approach is expected to bring such ultra-high data rate wireless technologies to potential users and to meet and explore real-world applications at the earliest opportunity as a technology driver [5]. However, the propagating optical wave is influenced in the FSOC channel by random atmospheric changes (wind speed, temperature, relative humidity, and pressure) [6], thermal expansion, weak earthquakes, and typical high-rise building sways which result in decreasing the average received power, increasing the bit error rate (BER), and severely degrading the communication link quality/reliability [7][8][9]. These are all the general problems that require attenuation to be dealt with.…”

Section: Introductionmentioning

confidence: 99%

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Intensity feedback-based beam wandering mitigation in free-space optical communication using neural control technique

Raj¹,

Selvi

Durai

et al. 2014

J Wireless Com Network

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Over the last two decades, free-space optical communication (FSOC) has become more and more interesting as an adjacent and/or alternative to radio frequency (RF) and optical fiber communications. The optical wave propagation in the FSOC channel is severely affected by atmospheric parameters, and it leads to the degradation of the data transmission quality and reliability. Among the various atmospheric effects, the beam wandering is the main cause of major power loss and cannot be solved without the incorporation of the beam centroid stabilization system. Therefore, designing a suitable opto-electronic assembly with a beam wandering mitigation system becomes significant to improve the performance of the FSOC system. A FSOC experimental setup is developed for the link range of 0.5 km in the college campus. A neural controller is designed for beam wandering mitigation. The neural controller processed the beam pointing (beam location) information obtained from an opto-electronic position detector (OPD) and then generated the necessary control outputs to the fast steering mirror (FSM) to steer the beam in the counter-direction to mitigate the beam wander at the receiver station. New design approach and architecture development for the implementation of the designed neural controller in the field-programmable gate array (FPGA) to mitigate the beam wandering are presented. The investigations on the performance of the neural controller in aiming a laser beam to be at a particular point on the detector plane are tested under dynamic disturbances generated at the transmitter in addition to the atmospheric effects through which the maximum correction capability of the developed neural controller is examined. Evidence of the suitability and the effectiveness of the proposed neural controller is evaluated in terms of beam centroid displacement, power spectral density (PSD), radial displacement on a 2D plane, effective scintillation index (ESI), Q-factor, and bit error rate (BER). The beam wandering range of −0.13 to +0.16 mm, maximum of 55 dB disturbance band attenuation with a frequency range of 0 Hz through 2 kHz, ESI of 0 to 0.15, Q-factor of 6, and BER of 6.45 × 10 −9 are achieved due to the incorporation of the developed neural controller in different real-world environmental conditions.

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Section: Background and Related Workmentioning

confidence: 99%

Section: Fsoc Experimental Test-bed Configuration and Control Strategmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Intensity feedback-based beam wandering mitigation in free-space optical communication using neural control technique

Raj¹,

Selvi

Durai

et al. 2014

J Wireless Com Network

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“…However, the atmospheric turbulence greatly degrades the performance of the coherent FSO systems [5]. The wavefront distortion, scintillation, beam wandering and spreading caused by a turbulent atmosphere will not only degrade the entrance efficiency of the receiving antenna but also cause mismatch of the field of the signal beam and the local oscillator (LO) [6].…”

Section: Introductionmentioning

confidence: 99%

BER Analysis of Coherent Free Space Optical Communication Systems with Holographic Modal Wavefront Sensor

Liu

Yao

Huang

et al. 2017

Current Optics and Photonics

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Degradation of bit-error-rate (BER), caused by atmospheric turbulence, seriously hinders the performance of coherent Free Space Optical (FSO) communication systems. An adaptive optics system proves to be effective in suppressing the atmospheric turbulence. The holographic modal wavefront sensor (HMWFS) proposed in our previous work, noted for its fast detecting rates and insensitivity to beam scintillation, is applied to the coherent FSO communication systems. In this paper, based on our previous work, we first introduce the principle of the HMWFS in brief and give the BER of the coherent FSO with homodyne detection in theory, and then analyze the improvement of BER for a coherent FSO system based on our previous simulation works. The results show that the wavefront sensor we propose is better for weak atmospheric turbulence. The most obvious advantages of HMWFS are fast detecting rates and insensitivity to beam scintillation.

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“…The point-to-point free space optics (FSO) communication is used to provide high-speed, high-bandwidth and protocol-independent secure communication for a variety of applications such as last mile, HDTV transmission, fiber backup [1][2][3]. The performance of the FSO communication system is deteriorated by the atmospheric attenuation and turbulence.…”

Section: Introductionmentioning

confidence: 99%

Performance enhancement of free space optical communication system using beam-optimized serial relaying in saturated atmosphere with pointing errors

2016

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In this paper, the performance improvement of a free space optical communication system with multi-hop and beam optimization has been studied. Novel closed-form expressions for the end-to-end average bit error rate, outage probability and average capacity of multi-hop free space communication system with decode-and-forward relaying are derived. Beam optimization is done using NelderMead simplex algorithm. A composite channel model using atmospheric attenuation, turbulence and pointing errors is used to model the atmospheric impairments. The saturated atmospheric conditions are modeled by negative exponential channel model, and pointing error effects are considered by normalized jitter standard deviation parameter. The performance of the free space optical communication system in terms of end-to-end average bit error rate, outage probability and average channel capacity in saturated atmospheric turbulence conditions and pointing errors is significantly enhanced by using beam-optimized serial relaying with decode-andforward transmission. The simulation results obtained by Monte Carlo simulation are in agreement with the results obtained from the closed-form expressions.

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Bit error rate analysis with real-time pointing errors correction in free space optical communication systems

Cited by 26 publications

References 29 publications

Intensity feedback-based beam wandering mitigation in free-space optical communication using neural control technique

Intensity feedback-based beam wandering mitigation in free-space optical communication using neural control technique

BER Analysis of Coherent Free Space Optical Communication Systems with Holographic Modal Wavefront Sensor

Performance enhancement of free space optical communication system using beam-optimized serial relaying in saturated atmosphere with pointing errors

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