Show/Hide Menu
Hide/Show Apps
Logout
Türkçe
Türkçe
Search
Search
Login
Login
OpenMETU
OpenMETU
About
About
Open Science Policy
Open Science Policy
Communities & Collections
Communities & Collections
Help
Help
Frequently Asked Questions
Frequently Asked Questions
Guides
Guides
Thesis submission
Thesis submission
MS without thesis term project submission
MS without thesis term project submission
Publication submission with DOI
Publication submission with DOI
Publication submission
Publication submission
Supporting Information
Supporting Information
General Information
General Information
Copyright, Embargo and License
Copyright, Embargo and License
Contact us
Contact us
Fast simulation and modeling of scattering from targets in MIMO imaging systems
Download
MsThesis_YunusEmreGUL.pdf
Date
2022-5-11
Author
Gül , Yunus Emre
Metadata
Show full item record
This work is licensed under a
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License
.
Item Usage Stats
162
views
162
downloads
Cite This
The forward model analysis in a multiple input multiple output (MIMO) system requires the computation of the signals received by receiver antennas when various targets are illuminated by a transmitter antenna. The full wave analysis of such systems provides accurate results with high computational cost. Fast analysis of the system can be achieved by simple models based on several approximations which limits the accuracy. In this thesis, a modeling technique that provides better accuracy compared to simple models and achieves faster simulation time than full-wave analysis of the whole system is proposed. Full-wave simulation result of an isolated antenna is used as an input for this methodology. With the help of surface equivalence theorem and small dipole approximation, the incident field over the target and receiver antennas are found. MoM technique is employed to find scattered fields created by target due to this incident field. Finally, scattered field data is utilized in reaction theorem to compute the signal received by the receiver antenna.
Subject Keywords
MIMO
,
Method of moments
,
Reaction theorem
URI
https://hdl.handle.net/11511/97406
Collections
Graduate School of Natural and Applied Sciences, Thesis
Suggestions
OpenMETU
Core
Electromagnetic Scattering from Obstacles in the Near Field Region of Electrically Large Arrays
Cetin, Ramazan; Aydın Çivi, Hatice Özlem; Nepa, Paolo; Manara, Giuliano (2009-09-18)
In this paper, an efficient method for the analysis of electromagnetic scattering/radiation from the obstacles nearby electrically large array antennas, with nonuniform excitation, is proposed. The approach is based on the combination of a ray field representation of electrically large arrays and a DFT (Discrete Fourier Transform) based representation of array current distribution. Proposed method is applied to a 2D problem: Radiation of a linear array of 2N+1 infinitely long current elements with tapered c...
Multi-Point Single-Antenna Sensing Enabled by Wireless Nested Split-Ring Resonator Sensors
Ozbey, Burak; ERTÜRK, VAKUR BEHÇET; Kurç, Özgür; ALTINTAŞ, AYHAN; DEMİR, Hilmi Volkan (2016-11-01)
In this paper, simultaneous multi-point wireless sensing is proposed and demonstrated via multiple sensors in nested split-ring resonator (NSRR) geometry coupled to a single illuminator antenna. In this passive multi-point sensing system, each probe in the sensor array is assigned a non-overlapping spectral interval for frequency shift in response to local mechanical loading around a unique operating resonance frequency in the band of the antenna. Here, it is shown that the antenna is capable of capturing t...
Polarization diversity in channel modeling for mimo systems
Söker, Burak; Tuncer, Temel Engin; Department of Electrical and Electronics Engineering (2013)
In a multiple-input multiple-output (MIMO) system, inter-antenna distances can be made large and uncorrelated signals can be transmitted and received when there is sufficient space at the transmitter (TX) and receiver (RX). When the antennas are closely spaced, diversity advantage is lost and communication performance degrades. In this case, polarization diversity can be used in order to decrease the correlation and improve communication performance. A detailed channel model, which includes both cross polar d...
Performance Comparison of Single and Dual Polarized MIMO Systems
Soker, Burak; Tuncer, Temel Engin (2013-04-26)
Polarization diversity in a 2x2 MIMO communication system is investigated for Alamouti and spatial multiplexing transmission schemes. Parameters such as cross polar discrimination and correlation coefficients introducing the polarization diversity are included in the channel model. Receive antenna correlation coefficients are generated from a realistic random model. The relative performance of the single and dual polarizations depends significantly on the channel characteristics. Single and dual polarizatio...
Sum Capacity of General Deterministic Interference Channel with Channel Output Feedback
Sahai, Achaleshwar; Aggarwal, Vaneet; Yüksel Turgut, Ayşe Melda; Sabharwal, Ashutosh (2010-01-01)
In a two-user interference channel, there are four possible feedback paths - two from each receiver to the transmitters. This leads to 16 possible models of feedback. In this paper, we derive the sum capacity of two user deterministic interference channel for all sixteen cases. We find that whenever any of the direct link feedback from a receiver to its own transmitter is present, the sum-capacity is the same as when all four feedback links are present. Further when no direct link feedback is present, the s...
Citation Formats
IEEE
ACM
APA
CHICAGO
MLA
BibTeX
Y. E. Gül, “Fast simulation and modeling of scattering from targets in MIMO imaging systems,” M.S. - Master of Science, Middle East Technical University, 2022.
