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Wyszukujesz frazę "SAC-OCDMA" wg kryterium: Temat


Wyświetlanie 1-3 z 3
Tytuł:
SAC-OCDMA over Hybrid FTTx Free Space Optical Communication Networks
Autorzy:
Sahbudin, R. K. Z.
Chun, T. T. K.
Anas, S. B. A.
Hitam, S.
Mokhtar, M.
Powiązania:
https://bibliotekanauki.pl/articles/308402.pdf
Data publikacji:
2015
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
Hybrid FTTx free space optical
Khazani-Syed code
SAC-OCDMA
Spectral direct decoding
Opis:
This paper presents an investigation of Spectral Amplitude Coding Optical Code Division Multiple Access (SAC-OCDMA) over hybrid Fiber-to-the-x (FTTx) Free Space Optical (FSO) link under different weather conditions. FTTx and FSO are the last mile technologies that complement each other in delivering secure and high speed communication to customers' residence or office. SAC-OCDMA is one of the potential multiplexing techniques that has become a research area of interest in optical communications and considered a promising technique for FTTx access networks. It is based on Khazani-Syed (KS) code with Spectral Direct Decoding (SDD) technique. All the components involved in the network were specied according to the available market product in order to simulate the actual environment as close as possible. The result shows that for bit error rate (BER) of 10‾9, the network is able to perform with 20 km Single Mode Fiber (SMF) spanning from the central office (CO) and 1.48 km FSO range with transmission rate of 1.25 Gb/s during heavy rain.
Źródło:
Journal of Telecommunications and Information Technology; 2015, 2; 52-58
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of SHIFTZCC codes for Optical CDMA system
Autorzy:
Panda, Satyasen
Powiązania:
https://bibliotekanauki.pl/articles/1178705.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
cross correlation (CC)
multiple access interference (MAI)
optical code division multiple access (OCDMA)
shift zero cross correlation code (SHIFTZCC) and signal to noise ratio (SNR)
spectral amplitude coding optical code division multiple access (SAC-OCDMA)
Opis:
In this paper, we propose a novel SAC-OCDMA code called Shift Zero Cross Correlation (SHIFTZCC) code with zero cross correlation property to minimize the Multiple Access Interface (MAI), to be more scalable and secure compared to the other existing SAC-OCDMA codes. This SHIFTZCC code is constructed using address segment and data segment. In this work, the proposed SHIFTZCC code is implemented in an optical network using the Opti-System software for the spectral amplitude coded optical code division multiple access (SAC-OCDMA) scheme. The chief advantage of the proposed SHIFTZCC code is the zero cross correlation property, which reduces both the MAI and other noises improving the system performance. The proposed SHIFTZCC code provides flexibility in selecting the code parameters, supports a large number of users with higher data rate and longer fiber length. Simulation results prove that the optical code division multiple access system based on the proposed SHIFTZCC code supports maximum number of simultaneous users with higher transmission rate, lower bit error rates (BER) and longer travelling distance without any signal quality degradation, as compared to the former existing SAC-OCDMA codes.
Źródło:
World Scientific News; 2017, 67, 2; 365-389
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Three dimensional optical CDMA framework with direct detection technique
Autorzy:
Panda, Satyasen
Powiązania:
https://bibliotekanauki.pl/articles/1178377.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Cross correlation (CC)
Multiple access interference (MAI)
Phase induced intensity noise (PIIN)
Spectral amplitude coding optical code division multiple access (SAC-OCDMA)
Three dimensional modified quadratic congruence/prime hop code (3-D MQC/PHC)
Three dimensional optical code division multiple access (3-D OCDMA)
Opis:
In this paper, a three-dimensional (3-D) wavelength/time/space code is developed for optical code division multiple access (OCDMA) networks with direct detection technique in the receiver side. The 3-D codes are developed by mixing two-dimensional modified quadratic congruence (MQC) code and one-dimensional prime hop code (PHC) code. The encoders and decoders are constructed using fiber Bragg gratings and delay lines to minimize the bit error rate (BER). The performance analysis of the 3-D OCDMA system is based on measurement of signal to noise ratio (SNR), BER, received power and eye diagram for different numbers of simultaneous users. Also, in the analysis, various types of noises and multiple access interference (MAI) effects are considered. The received optical power is also measured at various levels of BER to analyze the effect of attenuation.
Źródło:
World Scientific News; 2017, 77, 2; 337-353
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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