Inter-aperture correlation in MIMO free space optical systems

Ozbilgin, Tugba; Koca, Mutlu

doi:10.1016/j.optcom.2015.05.025

Cited by 8 publications

(3 citation statements)

References 23 publications

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“…It is assumed that the transmit and receiver arrays are established sufficiently apart. The interaperture separation that corresponds to this condition is called coherent width 38 considering which, the channel coefficients on MIMO irradiance links are guaranteed to be independent. The signal at the destination node after EGC can be written as 15 r EGC =…”

Section: Fso Linkmentioning

confidence: 99%

r_{EGC} = true \sum_{n = 1}^{N} r_{n} = G \sqrt{η P_{R}} true \sum_{n = 1}^{N} true \sum_{m = 1}^{M} y_{r, n m} \sqrt{I_{n m}} + true \sum_{n = 1}^{N} n_{2, n},

where η denotes the optical‐to‐electrical conversion coefficient, G is the fixed gain,

P_{R} = P_{n m}

represents the power transmitted at the relay node, and n 2, j represents the AWGN with zero‐mean and variance σ 2 at the J th link.…”

Section: System and Channel Modelsmentioning

confidence: 99%

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Diversity aided millimeter‐wave/free space optical cooperative relaying systems

Goel

Upadhya

Dwivedi

2021

Int J Communication

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In this paper, we investigate the performance of mixed millimeter-wave (mmWave)/multiple input multiple output (MIMO)-free space optics (FSO) cooperative relaying system. The mmWave link is assumed to undergo multipath fading and shadowing which has been modeled as generalized-K distributed fading, whereas the diversity aided FSO link is considered to experience Gamma-Gamma turbulence. We consider amplify-and-forward (AF) relaying strategy and multiple signals arriving at the receiver are combined using equal gain combining (EGC) scheme. Analytical closed form expressions for performance metrics such as outage probability, bit error rate (BER), and the ergodic channel capacity are derived in terms of bivariate Fox's H-function for the considered mixed mmWave/MIMO-FSO relaying system. In order to further simplify the obtained results, we analyze the system performance for the case of high signal-to-noise ratio (SNR) to present the asymptotic expressions for the outage probability and BER in terms of elementary functions. To this end, we have formulated an optimum power allocation scheme which minimizes the probability of outage experienced by the end user by allocating the optimum power on the FSO link. We also analyze the proposed system for the impact of pointing errors in a separate section by deriving closed-form expressions for the outage probability and BER. Finally, numerical results have been demonstrated the findings of the research work which have supplemented by Monte Carlo simulations.

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Section: Fso Linkmentioning

confidence: 99%

r_{EGC} = true \sum_{n = 1}^{N} r_{n} = G \sqrt{η P_{R}} true \sum_{n = 1}^{N} true \sum_{m = 1}^{M} y_{r, n m} \sqrt{I_{n m}} + true \sum_{n = 1}^{N} n_{2, n},

where η denotes the optical‐to‐electrical conversion coefficient, G is the fixed gain,

P_{R} = P_{n m}

represents the power transmitted at the relay node, and n 2, j represents the AWGN with zero‐mean and variance σ 2 at the J th link.…”

Section: System and Channel Modelsmentioning

confidence: 99%

Diversity aided millimeter‐wave/free space optical cooperative relaying systems

Goel

Upadhya

Dwivedi

2021

Int J Communication

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“…However, the aforementioned investigations have neglected the spatial correlation of MIMO subchannels. In practical WOC MIMO applications, the true benefits provided by multiple lasers may be limited by spatial correlation [11,12]. e spatial correlation is quantified as a function of beam separation, turbulence strength, propagation distance, and receiver aperture for the multiple-input single-output (MISO) system in [13].…”

Section: Introductionmentioning

confidence: 99%

Performance Evaluation of MPPM-Coded Wireless Optical MIMO System with Combined Effects over Correlated Fading Channel

Zhang

Wang

Cao

et al. 2020

International Journal of Antennas and Propagation

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The performance of wireless optical MIMO system with multiple pulse position modulation (MPPM) over correlated fading channel is investigated. The combined effects of atmospheric attenuation, atmospheric turbulence, and pointing error are taken into consideration. The bit error rate (BER) and the ergodic channel capacity are analyzed by utilizing the Poisson counting model and the exponential correlation model. Moreover, their approximate expressions are derived. The simulation results demonstrate that the pointing error is the most prominent influence factor over weak correlated channel. The performance degradation caused by a high channel correlation coefficient is more than that of pointing error in strong correlated channel. Therefore, the use of pointing, acquisition, and tracking (PAT) system and reasonable arrangement of the number and spacing of antennas at the transceiver are the keys to improve system performance.

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Performance analysis of MIMO wireless optical communication system with Q-ary PPM over correlated log-normal fading channel

Wang

Lynette

et al. 2018

Optics & Laser Technology

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Inter-aperture correlation in MIMO free space optical systems

Cited by 8 publications

References 23 publications

Diversity aided millimeter‐wave/free space optical cooperative relaying systems

Diversity aided millimeter‐wave/free space optical cooperative relaying systems

Performance Evaluation of MPPM-Coded Wireless Optical MIMO System with Combined Effects over Correlated Fading Channel

Performance analysis of MIMO wireless optical communication system with Q-ary PPM over correlated log-normal fading channel

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