Communication Engineering & Networking
Permanent URI for this collectionhttps://etd.hu.edu.et/handle/123456789/73
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Item PERFORMANCE COMPARISION OF 60GHZ WITH 2.4GHZ AND 5GHZ FOR WLAN OVER RICIAN FADING CHANNEL(Hawassa University, 2021-10-17) SHIMELIS ABATE BELAYCurrently, number of wireless technologies deployed to connect daily activities of human being in different ways and systems. Among those technology Wireless Local Area Network (WLAN) the one which plays crucial role. Hence, it is delivered by use of 2.4GHz and 5GHz frequencies. Due to the number of users increase the two main problem became challenges which are spectrum scarcity and throughput. To solve the challenge there are several types of research are done and are going to be done related to 60GHz Millimeter Wave Frequency for WALN. In this thesis, coverage and capacity performance comparison of 60 GHz channel capacity over Rican fading channels with 2.4 GHz and 5 GHz for WLAN service to give a better selection for WLAN users in the future. By using with bit error rate (BER) and SNR for small-scale (fast) fading with higher M-ary QAM modulation scheme. As a result, the Rician Channel fading for 60GHz with comparisons of 2.4 and 5 GHz WLAN frequency has high throughputs, which is 60GHz channel capacity is 13.5 times of 5GHz channels, and 54 times channels of 2.4GHz. Therefore, it is more advantageous for high throughput user demands than 2.4 and 5GHz frequencies used for IEEE 802.11’s Standards. 60 GHz distance coverage, relatively time less half coverage of than 2.4GHz frequency and less than by around 7-meter time less than 5GHz frequency coverage. Hence, the shorter the coverage of 60GHz give an advantage to best candidate for frequency re-use to solve spectrum scarcity.Item Design of Wavelength Division Multiplexing based Passive Optical Network Transmission System using Heterodyne Receiver for 5G Transport(Hawassa University, 2022-04-13) Wondmagegn WanaFifth Generation network standard has put higher peak data rate (10x) and very low latency requirements (1/10) as compared to its predecessor 4G network. In any mobile network implementation, the transport network is critical component for delivering the intended services. The demand for high data rate in 5G requires massive capacity upgrade in the transport network. On the other hand, latency in 4G and older technologies is too much as compared to 5G requirements. Hence Building low-latency and high-capacity transport networks is vital for new high-speed cellular technologies. Optical fiber-based technologies are essential to meet the high bandwidth demands of 5G transport Network. The two contending optical technologies for 5G transport are point-to-point (P2P) fiber access and point-to-multipoint (P2MP). P2P fiber access has low fiber efficiency and requires infrastructure installation for new deployment. Point-to multipoint fiber has high fiber efficiency as compared to P2P. Among the P2MP fiber options, TDM-PON uses dynamic bandwidth allocation (DBA) to multiplex services which introduces 1ms delay. On the other hand, WDM-PON doesn't require DBA, thus is a good candidate for low latency services. Studies on WDM-PON are using homodyne receiver. The proposed network was simulated in Opti Wave Optisystem simulation software. In this thesis, a new 2.4 Tbps WDM-PON based network using heterodyne receivers was built as solution for 5G transport network requirements. The performance of the new system was compared with back to-back model using BER and OSNR. An OSNR of 15.4 is required to obtain a BER of 10−3 dB for Heterodyne System while an OSNR of 14.8 dB is required for Back-to-Back System which is 0.6 dB higher. The results obtained from the Heterodyne system simulation are very close to the result found in case of back-to-back system. Hence, the WDM Dual Polarization 8-PSK PON system with heterodyne receiver can be used in 5G transmission