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pro vyhledávání: '"gamma gamma channel"'
Autor:
Jawad Mirza, Ahmad Atieh, Muhammad Ilyas Menhas, Salman Ghafoor, Musab Magam, Laiq Jamal, Sharif Iqbal Mitu Sheikh, Khurram Karim Qureshi
Publikováno v:
Ain Shams Engineering Journal, Vol 14, Iss 7, Pp 101983- (2023)
Optical wireless communication (OWC) links enable high-speed data transmission between earth stations and satellites. The propagation of optical signals through the atmosphere suffer from atmospheric attenuation and turbulence due to rain, fog, snow,
Externí odkaz:
https://doaj.org/article/480817fac4b242c092c19b578824fb47
Publikováno v:
Alexandria Engineering Journal, Vol 61, Iss 2, Pp 1459-1467 (2022)
A multi-hop free space optical link based on all-optical relays is presented. All-optical relays are either composed of simple optical amplifiers or optical regenerators. It has been shown that after a certain number of hops, the amplifier based rela
Externí odkaz:
https://doaj.org/article/199e4847a1984039a27cb29e111a0a73
Akademický článek
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Publikováno v:
IEEE Access, Vol 9, Pp 133510-133519 (2021)
There has been significant interest in free-space optical (FSO) communication by the research community in recent years. This is due to its high data rate, unlicensed spectrum, low cost, and immense security for FSO systems. Due to these advantages,
Externí odkaz:
https://doaj.org/article/bae7c3a98bfb43c69299e5b7b84d54a2
Publikováno v:
Alexandria Engineering Journal, Vol 59, Iss 6, Pp 4621-4631 (2020)
A cost efficient and reliable single mode fiber and free space optics based hybrid 32×5Gbps ultra dense wavelength division multiplexed-passive optical network architecture employing optical comb and polarization multiplexing is proposed. The propos
Externí odkaz:
https://doaj.org/article/098a734ee27c4bbba11dfc0113eeb351
Autor:
Pranav Sharda, Manav R. Bhatnagar
Publikováno v:
IEEE Access, Vol 8, Pp 114266-114286 (2020)
The diversity-multiplexing tradeoff (DMT) in a multiple-input multiple-output (MIMO) free-space optical (FSO) communication with limited channel state information at the transmitter (CSIT) is investigated. Using the limited CSIT based power and rate
Externí odkaz:
https://doaj.org/article/c31b988965454562904809fae4e5506e
Publikováno v:
IEEE Access, Vol 8, Pp 159244-159259 (2020)
In this paper, a novel signal-space diversity (SSD) technique based multipoint-to-multipoint cooperative scheme for a multiuser free-space optical communication system is proposed. In SSD technique, constellation points of the transmitted signal are
Externí odkaz:
https://doaj.org/article/b9428406f4c14f219bc6ee8de8a184fa
Publikováno v:
IEEE Photonics Journal, Vol 10, Iss 3, Pp 1-13 (2018)
Free-space optical communication (FSO) offers high security and high bandwidth, which is why it is widely used in digital communication systems. However, atmospheric turbulence or scintillation induces a voluminous degradation to the signal. So, diff
Externí odkaz:
https://doaj.org/article/af6978d030f14ed1980d4b47342a9002
Autor:
Prabu Krishnan
Publikováno v:
IEEE Access, Vol 6, Pp 75025-75032 (2018)
The flourishing technology in wireless communication-free space optics (FSO) offers lots of merits over radio frequency (RF) links due to its license free bandwidth, ease of installation, high security features, and viable cost for short distance com
Externí odkaz:
https://doaj.org/article/1a5ed28a7e7949abb222edd38815001b
Publikováno v:
Applied Sciences, Vol 11, Iss 21, p 9805 (2021)
Probabilistic shaping (PS) is a promising technique to approach the Shannon limit. In this paper, we design a practical coded modulation scheme based on PS to improve the capacity of coherent free-space optical (FSO) links with quadrature amplitude m
Externí odkaz:
https://doaj.org/article/74e3e0e10980484ba6224cd4df4ff95c