Zobrazeno 1 - 10 of 25 pro vyhledávání: '"George Kamucha"'
1
Akademický článek
Reducing PAPR of OFDM signals using a tone reservation method based on $$\ell_{\infty }$$ ℓ ∞ -norm minimization
Autor: Stephen Kiambi, Elijah Mwangi, George Kamucha
Publikováno v: Journal of Electrical Systems and Information Technology, Vol 9, Iss 1, Pp 1-15 (2022)
Abstract Orthogonal frequency division multiplexing (OFDM) continues to be the most preferred signal-multiplexing scheme for high-speed data communication. However, OFDM signals are known to have the problem of high peak-to-average power ratio (PAPR)
Externí odkaz: https://doaj.org/article/d3c79640ff7e454c91104451eb040a9a
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2
Akademický článek
A comparative study of chromatic dispersion compensation in 10 Gbps SMF and 40 Gbps OTDM systems using a cascaded Gaussian linear apodized chirped fibre Bragg grating design
Autor: Isidore Nsengiyumva, Elijah Mwangi, George Kamucha
Publikováno v: Heliyon, Vol 8, Iss 4, Pp e09308- (2022)
Optical time domain multiplexed (OTDM) technology helps to respond to the need for increased capacity and demand in internet traffic using optical transmissions. High-speed optical networks are highly affected by chromatic dispersion (CD) that causes
Externí odkaz: https://doaj.org/article/cc4c2c22851c4062b893209beb499102
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3
Akademický článek
Performance Analysis of a Linear Gaussian- and tanh-Apodized FBG and Dispersion Compensating Fiber Design for Chromatic Dispersion Compensation in Long-haul Optical Communication Networks
Autor: Isidore Nsengiyumva, Elijah Mwangi, George Kamucha
Publikováno v: International Journal of Optics, Vol 2022 (2022)
This paper investigates a novel compensation technique of dispersion effect mitigation using a combination of three- and four-stage-apodized fiber Bragg gratings (FBG) and dispersion compensating fiber (DCF) designs. Two designs using three-stage and
Externí odkaz: https://doaj.org/article/09dbdb8bdfb142b39335ee31ac25c1d1
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4
TV White Space Network Power Allocation Using Hybrid Grey Wolf Optimizer with Firefly Algorithm and Particle Swarm Optimization
Autor: Kennedy Ronoh, George Kamucha
Publikováno v: WSEAS TRANSACTIONS ON COMMUNICATIONS. 20:67-76
TV white spaces (TVWS) can be utilized by Secondary Users (SUs) equipped with cognitive radio functionality on the condition that they do not cause harmful interference to Primary Users (PUs). Optimization of power allocation is necessary when there
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::91cbd9eef9c08bfc5ad6da5c80108541
https://doi.org/10.37394/23204.2021.20.9
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5
PAPR Reduction in MIMO-OFDM Systems Using Low- Complexity Additive Signal Mixing
Autor: George Kamucha, Stephen Kiambi, Elijah Mwangi
Publikováno v: Journal of Communications. :468-478
A MIMO-OFDM wireless communication technique possesses several advantages accrued from combining MIMO and OFDM techniques such as increased channel capacity and improved BER performance. This has made the technique very amiable to current and future
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::5043ca17e257ca2a4ecd3b9ce7d67e34
https://doi.org/10.12720/jcm.16.11.468-478
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6
Comparison of Hybrid Firefly Algorithms for Binary and Continuous Optimization Problems in a TV White Space Network
Autor: George Kamucha, Ronoh Kennedy
Publikováno v: WSEAS TRANSACTIONS ON COMMUNICATIONS. 19:155-172
TV white spaces (TVWS) can be used by Secondary Users (SUs) through Dynamic Spectrum Access (DSA) as long as they do not cause harmful interference to Primary Users (PUs). Due to spectrum scarcity, there is increasing demand for DSA. When there is a
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b6f79b50d99d5aa574a61e49f2b87156
https://doi.org/10.37394/23204.2020.19.18
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8
An Efficacious MRI Sparse Recovery Method Based on Differential Under-Sampling and k-Space Interpolation
Autor: Henry Kiragu, Elijah Mwangi, George Kamucha
Publikováno v: 2020 IEEE 20th Mediterranean Electrotechnical Conference ( MELECON).
A proposed method that reduces the lengthy scan time characterizing Magnetic Resonance Imaging (MRI) is presented in this paper. The method also improves the robustness to noise and reconstruction artifacts associated with conventional MRI. It employ
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::e4498c08b87d9477aae0eb9fa036cb32
https://doi.org/10.1109/melecon48756.2020.9140563
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10
Improved Resource Allocation for TV White Space Network Based on Modified Firefly Algorithm
Autor: Kennedy Ronoh, Tonny K Omwansa, Thomas O. Olwal, George Kamucha
Publikováno v: Journal of Computing and Information Technology, Vol 26, Iss 3, Pp 167-177 (2018)
Journal of computing and information technology
Volume 26
Issue 3
There is continued increased demand for dynamic spectrum access of TV White Spaces (TVWS) due to growing need for wireless broadband. Some of the use cases such as cellular (2G/3G/4G/5G) access to TVWS may have a high density of users that want to ma
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::85596a5321a599255ac0d14c07e0c216
https://doi.org/10.20532/cit.2018.1004074
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