BPSK based SIM-FSO communication system with SIMO over log-normal atmospheric turbulence with pointing errors

Al-Nahhal, Mohamed; Ismail, Tawfik; Selmy, Hossam A. I.; Elmesalawy, Mahmoud M.

doi:10.1109/icton.2017.8024953

Cited by 18 publications

(8 citation statements)

References 11 publications

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“…These models are used to represent the random fluctuations of the atmosphere based on its condition (weak, moderate, strong). 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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“…A power series can represent the channel gain PDF as [2]

\lim_{h false\to 0} f_{h} false(h false) = a h^{t} + g_{t} false(h false),

where

g_{t} false(h false)

validates

\lim_{h false\to 0} false[g_{normalt} (h) / h^{normalt} false] = 0

. The coding gain and diversity order are given as [34] :

G_{c} = ξ ()(, \frac{2^{t - 1} a normalΓ false(\frac{t}{2} + 1 false)}{\sqrt{π} false(\frac{t + 1}{2} false)}),

where

ξ

is a positive constant depending on the modulation scheme [7]. It is derived to be

(M - 1) / 2

from (15)

G_{d} = \frac{t + 1}{2} .

…”

Section: Proposed Expressions For Close‐form and Asymptotic Aser Anmentioning

confidence: 99%

“…Several statistical models have been supposed to represent the atmospheric turbulence depending on its strength [5]. Gamma–gamma distribution is used for moderate‐to‐strong turbulence, whereas the log‐normal model is suggested in the case of weak turbulence [6, 7]. While K ‐distribution is used to represent strong turbulence [8, 9].…”

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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“…This growing demand for higher capacity will lead to unavoidable power. Therefore, AON is much less well represented in literature than PON because of its use is limited in a real context due to they are lower complex in the opinion of the optical domain specially because they are based on single wavelength two-point communication lines [21][22][23][24][25][26]. In 1980 PON was developed.…”

Section: Introductionmentioning

confidence: 99%

A Review of immigration obstacles to PON-FTTH and its evolution around the world

2021

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The require a bandwidth of every person will be increased from 16 Mbit/s to 50 up to 100M bit/s in the next 5 years in most of the growing counties. To solve this problem, FTTH may be the appropriate solution in a wide range. We experimentally investigate the deploy of PON-FTTH based on different kinds of passive optical network technology (E-PON, G-PON and VCSEL) and study the Obstacles of PON-FTTH Immigration after comparing it with older service (XDSL). Then analysis the reason on why these technologies chose by some country not others and why the technological need in Europe different with need in Africa and America. We discussed the solutions in telecommunications networks and or the economic aspect of projects all over the world, we found that GPON is more appropriable for accomplishment PON-FTTH than other networks. Thus GPON has been chosen for Europe, America and middle east. Choosing GPON techniques is decided by many factors include the infrastructure that was made before, the people demand for service and how much service they need because the need in Europe different with need in Africa and American and so on. Finally, we will suggest the appropriate solution in the energy savings, cost effective, higher security, and side of service transparency over other access networks for the future demand.

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BPSK based SIM-FSO communication system with SIMO over log-normal atmospheric turbulence with pointing errors

Cited by 18 publications

References 11 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

A Review of immigration obstacles to PON-FTTH and its evolution around the world

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