Analysis of the effect of element radiation pattern in the performance of mimo arrays used in imaging applications

Download
2020-10-11
Altuntaş, Fırat
Along with the developments in technology, complexity of the systems tends to increase. Consequently rigorous models that take into account of all the effects in such complex systems become very time consuming. In this study, an ultra-wide band (UWB) multi-input multi-output (MIMO) imaging system is considered and a simple model that is generally used in the analysis of such systems is improved with an effort to obtain results closer to those achieved by rigorous models. Simple or rigorous models simulates the data that is received by a receiver antenna when a specified target is illimunated by a transmitter antenna. After obtaining this data for all transmitter receiver pairs, the point spread function (PSF) of the system can be obtained with the utilization of back projection method. In order to verify the proper operation of the implemented simple model, UWB signal characteristics and antenna configuration in the array aperture are analyzed and the results are compared with those found in the literature. After verifying the proper operation of the implemented simple model, antenna radiation pattern is embedded into the calculations and an improved model is obtained. By comparing point spread functions obtained by using the data generated by improved and rigorous models, effect of element radiation pattern on multi-input multi-output (MIMO) imaging vi system is examined. In this thesis, full-wave electromagnetic simulation software CST Studio is used to generate the data of the rigorous model.

Suggestions

Experimenting with software testbeds for evaluating new technologies
LINDVALL, Mikael; RUS, Ioana; DONZELLI, Paolo; MEMON, Atif; ZELKOWITZ, Marvin; Betin Can, Aysu; BULTAN, Tevfik; ACKERMANN, Chris; ANDERS, Bettina; ASGARI, Sima; BASILI, Victor; HOCHSTEIN, Lorin; FELLMANN, Joerg; SHULL, Forrest; TVEDT, Roseanne; PECH, Daniel; HIRSCHBACH, Daniel (2007-08-01)
The evolution of a new technology depends upon a good theoretical basis for developing the technology, as well as upon its experimental validation. In order to provide for this experimentation, we have investigated the creation of a software testbed and the feasibility of using the same testbed for experimenting with a broad set of technologies. The testbed is a set of programs, data, and supporting documentation that allows researchers to test their new technology on a standard software platform. An import...
Estimation of the user's cognitive load while interacting with the interface based on bayesian network
Saydam, Aysun; Barbaros, Yet; Department of Cognitive Science (2021-9-10)
The complexity of human machine interfaces is increasing significantly in parallel with the development of technology and excessive data growth, but human cognitive capacity is limited. Therefore, measuring cognitive load is one of the most preferential and common ways to test the usability of user interfaces. There are many different physiological, behavioral and subjective methods to measure human performance and workload. Moreover, there are cognitive predictive models and many related applications based...
Using tag similarity in SVD-based recommendation systems
Osmanli, Osman Nuri; Toroslu, İsmail Hakkı (2011-12-01)
Data analysis has become a very important area for both companies and researchers as a consequence of the technological developments in recent years. Companies are trying to increase their profit by analyzing the existing data about their customers and making decisions for the future according to the results of these analyses. Parallel to the need of companies, researchers are investigating different methodologies to analyze data more accurately with high performance. In this paper, we adopted free-formatte...
Analysis of Block Recombination and Lazy Interpolation Methods and Their Applications to Saber
Aksoy, Berkin; Cenk, Murat (2022-01-01)
Since the beginning of the National Institute of Standards and Technology (NIST), The Post-Quantum Cryptog-raphy (PQC) Standardization Process, efficient implementations of lattice-based algorithms have been studied extensively. Lattice-based NIST PQC finalists use polynomial or matrix-vector multiplications on the ring with type Zq [x]/f(x). For convenient ring types, Number Theoretic Transform (NTT) can be used to perform multiplications as done in Crystals-KYBER among the finalists of the NIST PQC Standa...
Computation of Spectra of Large Networks
Erdem, Özge; Karasözen, Bülent (2010-11-27)
Many interacting complex systems in biology, physics, technology and social systems can be represented in a form of large networks. The networks are mathematically represented by graphs. A graph is usually represented by adjacency or Laplacian matrix. Many important features of the underlying structure and dynamics of them can be extracted from the analysis of the spectrum of graphs. Spectral analysis of the so called normalized Laplacian matrix of large networks has become popular in recent years. The Lapl...
Citation Formats
F. Altuntaş, “Analysis of the effect of element radiation pattern in the performance of mimo arrays used in imaging applications,” M.S. - Master of Science, Middle East Technical University, 2020.