Communication Systemhttp://ir.haramaya.edu.et//hru/handle/123456789/2442024-03-28T16:52:01Z2024-03-28T16:52:01ZINVESTIGATION OF INDOOR MILLIMETER WAVE PROPAGATION CHARACTERISTICS FOR FUTURE WIRELESS COMMUNICATION NETWORK USING RAY TRACINGAsefa SehaluDr. RP Singh (PhD)Atli Lemma (MSc)http://ir.haramaya.edu.et//hru/handle/123456789/68572023-11-10T12:02:28Z2022-08-01T00:00:00ZINVESTIGATION OF INDOOR MILLIMETER WAVE PROPAGATION CHARACTERISTICS FOR FUTURE WIRELESS COMMUNICATION NETWORK USING RAY TRACING
Asefa Sehalu; Dr. RP Singh (PhD); Atli Lemma (MSc)
The demands for indoor location services are increasing due to rapid growth in the smart wireless systems with higher data rates. These systems require the development of indoor wireless networks with big data rate and high capacity demanding large bandwidth. Thus, there is growing interest in developing efficient and reliable indoor propagation model for future wireless systems in millimeter wave frequency ranges that have high available bandwidth. This work includes the investigation of the propagation characteristics of millimeter waves in indoor environment using ray tracing method at 60 GHz. In this thesis, the standard building type, second floor of Haramaya University Technology (HIT) campus building 412 was considered as specific site. The properties of objects inside building floor such as thickness, permittivity and conductivity are defined using a package in WinProp, a propagation modelling and simulation tool that help to define the scenario and building data bases based on deterministic modelling method. Subsequently, the wideband propagation characteristic parameters (path loss, received power, delay spread, power delay profile, and angle spread) with and without human body effects have simulated and analyzed. In the study, the propagation parameters are analyzed by considering absorption, reflection, and diffraction due to building structure and furniture’s, location of transceivers, antenna effect, and attenuation, and mobility of human beings in the offices, corridor, and stairwell. The outcomes identified the scale of channel parameters characteristics of the future wireless communication. The thesis has covered propagation characteristics for indoor environment and investigation of mm wave in LOS and NLOS scenarios using 3D Intelligent Ray Tracing a package in WinProp tool.
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2022-08-01T00:00:00ZSIMULATION AND ANALYSIS OF MILLIMETER WAVE PROPAGATION CHARACTERISTICS BASED ON RAY TRACING APPROACHMerga, Segni(MSc)Debo, Feyisa (PhD)Lemma, Atli (MSc)http://ir.haramaya.edu.et//hru/handle/123456789/48062022-02-24T06:27:43Z2021-08-01T00:00:00ZSIMULATION AND ANALYSIS OF MILLIMETER WAVE PROPAGATION CHARACTERISTICS BASED ON RAY TRACING APPROACH
Merga, Segni(MSc); Debo, Feyisa (PhD); Lemma, Atli (MSc)
Millimeter waves hold strong promise for future wireless communication due to large available
bandwidth, which are not occupied yet. Due to the short wavelength and propagation limitation of
millimeter waves signals they experiencing severe multipath with large delay spread and fade
quickly because of high path loss i.e. large inter-symbol interference and fluctuation of received
signal. In addition, the wideband parameter related to propagation characteristics of this wave are
not well studied. Therefore, the main aim of the research is to simulate and analysis propagation
characteristics of millimetre wave in outdoor market and indoor office. In this research, Intelligent
Ray Tracing model used to predict wideband parameters that affect propagation of millimeter wave
by considering geometry and time variants objects. In this research, the biggest market place in
Africa, Mercato and Haramaya Institute of Technology Building-412 second floor is considered as
a case study. The vehicles and human moving with speed of 10 m/s and 1m/s considered in addition
to static objects to study millimeter wave propagation under blockage of time variant in outdoor and
indoor propagation environments respectively. The properties of time variant and static objects such
as thickness, permittivity and conductivity are built into the WinProp package called WallMan.
Material properties of the buildings, vehicles and humans significantly affects propagation of
signals. We have found out that the propagation is mainly due to direct path as well as single and
two-times reflections and diffractions from building wall and indoor materials. The effects of small
cell antenna height and moving objects on millimeter wave outdoor access scenario analyzed. The
strong received power and large delay spread due to multipath propagation as height of transmitter
is decreases predicted. The shadowing by vehicles obstruct and fluctuates signal strength at receiver
locations. The effect of human body on propagation of millimeter wave in indoor office simulated.
The movement of persons within the office room cause temporal variations of the received power,
path loss and delay spread and in NLOS it is result of reflections and diffraction from building
materials that cause deterioration of received signals unexpectedly. High variation of power delay
profile observed in NLOS. Prediction result of the wideband parameters related to the millimeter
wave propagation is important in designing and planning of future wireless communication system.
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2021-08-01T00:00:00ZDESIGN AND SIMULATION OF MULTIBAND SIERPINSKI CARPET FRACTAL ANTENNA FOR WIRELESS APPLICATIONTesfaye Beyene, ChalaBerhane Teklu, (Ph.D.) MerhawitPratap Singh, (PhD) Riteshhttp://ir.haramaya.edu.et//hru/handle/123456789/39322021-07-07T08:14:34Z2021-05-01T00:00:00ZDESIGN AND SIMULATION OF MULTIBAND SIERPINSKI CARPET FRACTAL ANTENNA FOR WIRELESS APPLICATION
Tesfaye Beyene, Chala; Berhane Teklu, (Ph.D.) Merhawit; Pratap Singh, (PhD) Ritesh
In recent technological advancements, wireless communication systems play important roles in our life. An antenna is one of the necessary devices used in wireless communication. Currently, wireless communication systems require antennas that have higher performance, compact in size, low cost, multiband, and wideband for both commercial and military applications. The miniaturized shape of an antenna is the latest among all, which is known as microstrip patch antennas (MPAs). The MPAs can fully attain the above requirements. Various qualities of MPAs are reduced size of the antenna, operating in multiband frequencies, easy to manufacture and install, simple to build on PCB board, and easy to fabricate. The fractal geometric shapes were applied to MPA to develop a miniaturized, multiband, and wideband antenna for wireless applications with better performance. In this thesis, rectangular Sierpinski carpet, H-shape Sierpinski carpet, and modified (polygon) Sierpinski carpet fractal antennas are designed with various iterations. This thesis aims to design and simulate of multiband Sierpinski carpet fractal antenna for wireless applications. The proposed antennas are designed on FR-4 epoxy substrate, having a relative permittivity of 4.4 with an operating frequency of 1.8 GHz. The overall size of the proposed antenna is 60x50x1.6 mm3. The performance of the proposed antenna has been analyzed in terms of various antenna parameters such as VSWR, gain, directivity, efficiency, radiation pattern, return loss, bandwidth. Design and simulation are done using ANSYS HFSS (High-Frequency Structure Simulator) Software. The simulation results obtained from a modified (polygon) Sierpinski carpet fractal antenna in the fourth iteration shows at 8.8 GHz resonant frequencies, achieved better bandwidth of 981 MHZ, return loss of -21.80 dB, VSWR of 1.19, the gain of 9.23 dB, and directivity of 11.30dB. The proposed antenna is applicable for multiband wireless applications such as RMM, LLWAS, LDRLC, UWB, and Satellite communication at 8.8 GHz operating frequency
76p.
2021-05-01T00:00:00ZDESIGN AND SIMULATION OF MULTIBAND SIERPINSKI CARPET FRACTAL ANTENNA FOR WIRELESS APPLICATIONBeyene, Chala Tesfayehttp://ir.haramaya.edu.et//hru/handle/123456789/39192021-07-07T03:44:28Z2021-05-01T00:00:00ZDESIGN AND SIMULATION OF MULTIBAND SIERPINSKI CARPET FRACTAL ANTENNA FOR WIRELESS APPLICATION
Beyene, Chala Tesfaye
In recent technological advancements, wireless communication systems play important roles in our life. An antenna is one of the necessary devices used in wireless communication. Currently, wireless communication systems require antennas that have higher performance, compact in size, low cost, multiband, and wideband for both commercial and military applications. The miniaturized shape of an antenna is the latest among all, which is known as microstrip patch antennas (MPAs). The MPAs can fully attain the above requirements. Various qualities of MPAs are reduced size of the antenna, operating in multiband frequencies, easy to manufacture and install, simple to build on PCB board, and easy to fabricate. The fractal geometric shapes were applied to MPA to develop a miniaturized, multiband, and wideband antenna for wireless applications with better performance. In this thesis, rectangular Sierpinski carpet, H-shape Sierpinski carpet, and modified (polygon) Sierpinski carpet fractal antennas are designed with various iterations. This thesis aims to design and simulate of multiband Sierpinski carpet fractal antenna for wireless applications. The proposed antennas are designed on FR-4 epoxy substrate, having a relative permittivity of 4.4 with an operating frequency of 1.8 GHz. The overall size of the proposed antenna is 60x50x1.6 mm3. The performance of the proposed antenna has been analyzed in terms of various antenna parameters such as VSWR, gain, directivity, efficiency, radiation pattern, return loss, bandwidth. Design and simulation are done using ANSYS HFSS (High-Frequency Structure Simulator) Software. The simulation results obtained from a modified (polygon) Sierpinski carpet fractal antenna in the fourth iteration shows at 8.8 GHz resonant frequencies, achieved better bandwidth of 981 MHZ, return loss of -21.80 dB, VSWR of 1.19, the gain of 9.23 dB, and directivity of 11.30dB. The proposed antenna is applicable for multiband wireless applications such as RMM, LLWAS, LDRLC, UWB, and Satellite communication at 8.8 GHz operating frequency.
76p.
2021-05-01T00:00:00Z