Abstract
In orthogonal frequency division multiplexing (OFDM) based communication systems multiple carriers having different frequencies are used to transmit different data at the same time. Complex values that describe attenuation on different subcarriers are called channel state information (CSI). This paper describes a novel method of two dimensional (2D) direction of arrival (DOA) estimation for uniform circular array (UCA) using CSI, available in transmitted OFDM signal. Firstly, using the fact that CSI among subcarriers comprises phase shift due to DOA and Time-of-Flight (ToF) number of antennas is virtually extended. Secondly, beamspace transform is applied to UCA's array manifold for CSI smoothing to virtually extend the number of observations. Finally, multiple signal classification (MUSIC) algorithm is applied on smoothed data for 2D DOA estimation. Comprehensive results and analysis are provided to show the superior performance of the proposed algorithm compared to the previous literature.
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