Performance improvement of FSO system using multi‐pulse pulse position modulation and SIMO under atmospheric turbulence conditions and with pointing errors

Ismail, Tawfik; Leitgeb, Erich; Ghassemlooy, Z.; Al-Nahhal, Mohamed

doi:10.1049/iet-net.2017.0203

Cited by 33 publications

(23 citation statements)

References 25 publications

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“…While the log‐normal distribution is used to model weak turbulence, the negative‐exponential and K distributions are used for the strong turbulence. The gamma‐gamma (GG) distribution can be used with a wide range of turbulence condition(weak to strong) …”

Section: Introductionmentioning

confidence: 99%

Enhancing spectral efficiency of FSO system using adaptive SIM/M‐PSK and SIMO in the presence of atmospheric turbulence and pointing errors

Alnahhal

Ismail

2019

Int J Communication

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This paper proposes an adaptive transmission modulation (ATM) techniquefor free-space optical (FSO) links over gamma-gamma turbulence channels.The ATM technique provides efficient utilization of the FSO channel capacity for improving spectral efficiency, by adapting the order of the phase-shift keying modulation scheme, according to the channel conditions and the required bit error rate (BER). To overcome the channel degradation resulting from the turbulence effects as well as the pointing errors (PEs), single-input multiple-output (SIMO) system with maximal ratio combining (MRC) is proposed. Exact closed-form expressions of BER and upper bound of the capacity are derived and verified by Monte Carlo simulations. The numerical results show that the proposed adaptive technique improves the spectral efficiency (SE) five times higher than the nonadaptive technique at the same BER threshold (10 −3 ).This improvement is achieved at signal-to-noise ratio (SNR) equals 27 and 42 dB in the case of atmospheric turbulence without and with PE, respectively. Furthermore, this SE could be obtained while the SNR = 30 dB by using (1 × 4) SIMO scheme with MRC and PE and having the same transmitting optical power.

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Section: Introductionmentioning

confidence: 99%

Enhancing spectral efficiency of FSO system using adaptive SIM/M‐PSK and SIMO in the presence of atmospheric turbulence and pointing errors

Alnahhal

Ismail

2019

Int J Communication

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“…The free space path loss is given by

{(λ / 4 π L)}^{2}

, where

λ

is the wavelength of the laser source and L is the link distance. Finally,

D_{T}

and

D_{R}

are aperture diameter of the Tx and Rx, respectively [11]. The channel state or channel gain h is represented by

h = h_{l} h_{t} h_{p}

, with

h_{l}

being the atmospheric attenuation which is deterministic at a certain weather condition and link distance [23],

h_{t}

denoting the atmospheric turbulence, and

h_{p}

representing the PE effects;

h_{t}

and

h_{p}

are both statistically independent random variables (RVs) [24].…”

Section: System and Channel Modelsmentioning

confidence: 99%

“…The combined effect of atmospheric turbulence and PEs is further investigated in [10] for gamma–gamma channel with Rician model. Log‐normal and gamma—gamma/Rician are studied in [2] while gamma–gamma/Raylight is shown in [11]. Additionally, [12] analysed the bit error rate (BER) performance of FSO links over the gamma–gamma channel with various PE models.…”

Section: Introductionmentioning

confidence: 99%

Generic evaluation of FSO system over Málaga turbulence channel with MPPM and non‐zero‐boresight pointing errors

2020

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“…Although in [17], the BER analysis of the FSO-MISO system with RC was carried out over correlated turbulence, the analysis was applicable only for constant correlation. The effect of the pointing error on the performance of FSO systems using multi-pulse pulse position modulation (MP-PPM) over the turbulence channel was studied in [18]. The authors in [19] proposed an adaptive transmission modulation (ATM) technique for FSO links in order to improve the spectral efficiency of the system.…”

Section: Performance Analysis Of Multivariatementioning

confidence: 99%

“…Further, by replacing I v (x) with its series form (given in [43,Eq. (8.445)]) in (18), then substituting it in (21), and following some mathematical manipulations, P 1 can be expressed as:…”

Section: ) Conditional Bermentioning

confidence: 99%

Experimental and Analytical Investigations of an Optically Pre-Amplified FSO-MIMO System With Repetition Coding Over Non-Identically Distributed Correlated Channels

et al. 2020

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This paper presents theoretical and experimental bit error rate (BER) results for a freespace optical (FSO) multiple-input-multiple-output system over an arbitrarily correlated turbulence channel. We employ an erbium-doped fiber amplifier at the receiver (Rx), which results in an improved Rx's sensitivity at the cost of an additional non-Gaussian amplified spontaneous emission noise. Repetition coding is used to combat turbulence and to improve the BER performance of the FSO links. A mathematical framework is provided for the considered FSO system over a correlated non-identically distributed Gamma-Gamma channel; and analytical BER results are derived with and without the pre-amplifier for a comparative study. Moreover, novel closed-form expressions for the asymptotic BER are derived; a comprehensive discussion about the diversity order and coding gain is presented by performing asymptotic analysis at high signal-tonoise ratio (SNR). To verify the analytical results, an experimental setup of a 2 × 1 FSO-multiple-inputsingle-output (MISO) system with pre-amplifier at the Rx is developed. It is shown analytically that, both correlation and pre-amplification do not affect the diversity order of the system, however, both factors have contrasting behaviour with respect to coding gain. Further, to achieve the target forward error correction BER limit of 3.8 × 10 −3 , a 2 × 1 FSO-MISO system with a pre-amplifier requires 6.5 dB lower SNR compared with the system with no pre-amplifier. Moreover, an SNR penalty of 2.5 dB is incurred at a higher correlation level for the developed 2 × 1 experimental FSO setup , which is in agreement with the analytical findings.

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Performance improvement of FSO system using multi‐pulse pulse position modulation and SIMO under atmospheric turbulence conditions and with pointing errors

Cited by 33 publications

References 25 publications

Enhancing spectral efficiency of FSO system using adaptive SIM/M‐PSK and SIMO in the presence of atmospheric turbulence and pointing errors

Enhancing spectral efficiency of FSO system using adaptive SIM/M‐PSK and SIMO in the presence of atmospheric turbulence and pointing errors

Generic evaluation of FSO system over Málaga turbulence channel with MPPM and non‐zero‐boresight pointing errors

Experimental and Analytical Investigations of an Optically Pre-Amplified FSO-MIMO System With Repetition Coding Over Non-Identically Distributed Correlated Channels

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