Performance analysis of QPSK in free-space optical communications systems over combined channel with phase compensation error

Shang, Junyu; Nan, Zuoyong; Liu, Siqi; Qiu, Chen; Xin, Xuemei

doi:10.1007/s11082-015-0137-y

Cited by 4 publications

(1 citation statement)

References 11 publications

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“…Besides these formats, Quadrature Phase Shift Keying (QPSK) is one of the most attractive modulation techniques lately adopted in wireless optical communications, especially for FSO communication systems, because of the superior transmission characteristics that it allows including being, bandwidth efficient, cost‐effective and ease of implementation. Authors in 35 present a performance study of an FSO link using QPSK modulation considering weather conditions, pointing errors and phase noise. While reference 36 presents a comparative study of an FSO system using the QPSK modulation technique over an atmospheric channel attenuated by fog operating at three carrier wavelengths.…”

Section: Introductionmentioning

confidence: 99%

Image transmission performance analysis through free space optical communication link using coherent QPSK modulation under various environmental conditions

Djir

Meskine

Tayebi

2023

Trans Emerging Tel Tech

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Free space optics (FSO) technology has been used recently in many applications due to its various advantages such as high bandwidth, easy deployment, high security, free installation license and immunity to electromagnetic interference. However, this type of communication is vulnerable to meteorological conditions such as rain, haze and fog which significantly degrade the system's efficiency. To enhance the effectiveness of the FSO systems, Quadrature Phase Shift Keying (QPSK) modulation based on coherent detection constitutes a promising technique for achieving high spectral efficiency and long‐distance FSO links with the characteristics of low‐cost implementation and simple design. This work aims to investigate the performance of FSO communication links on image transmission under the presence of atmospheric attenuations. A comparative study has been made using QPSK modulation scheme and on–off‐keying (OOK) modulation scheme to estimate the maximum range that was used to recover an RGB transmitted image over an FSO link under different meteorological weathers. The obtained results clearly show that the quality of the received image has degraded significantly during transmission through free space yielding to limit the propagation range. Moreover, the proposed FSO communication system performs well when using QPSK modulation rather than OOK modulation in different environmental conditions. Thus, to improve the quality of the received image under adverse fog weather condition, high power and small beam divergence angle have been suggested to increase system's performance. The proposed solution increases the communication range of the FSO link by 230 m and 100 m for moderate and heavy fog, respectively.

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Section: Introductionmentioning

confidence: 99%