| Summary: | 碩士 === 國立中正大學 === 通訊工程研究所 === 104 === As people continue to research more efficient ways to improve communication technologies, the smart antenna system is an important part of wireless communication technologies. Signals in the process of transmission may be subject to many different ways of interference or attenuation. For example, multipath propagation, path loss, non-light-of-sight propagation (NLOS) and so on which effect the accuracy of smart antenna for receiving signals and estimating the direction. In this thesis, we aim to estimate the direction-of-arrival (DOA) of radar array signals under multipath environments. Conventional schemes, e.g., CLEAN and RELAX algorithms, require computational complexity that is proportional to the number of sample points required to partition the entire field of view (FOV). However, the complexity of these two algorithms is pretty high, because the whole sample points of angles must be scanned at the same time. Therefore, the higher the precision of the scanning angle, the higher the complexity is. The proposed algorithm is quite different from CLEAN and RELAX algorithms, of which we use the Newton’s method which has fast convergence characteristics. The Newton’s method can effectively reduce the computational complexity while maintain almost the same performance as CLEAN and RELAX algorithms and better than gradient descent algorithm.
Key words: array signal, multipath effect, Newton’s method
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