Super-resolution DOA estimation in switch beam smart antenna

Base transceiver stations (BTS) with antenna arrays employing narrow beam patterns pointing to each user rather than omnidirectional or directional antenna covering a large number of users or areas can provide better network performance. It is the fundamental theory of smart antenna systems (SAS) designed for a modern cellular network, which is more challenged nowadays by network capacity and service quality due to the increased Internet traffic volume. In this paper, super-resolution algorithms are applied to the switched beam smart antenna system, and a higher angle resolution and performance are achieved. This paper presents super-resolution algorithms specifically developed for the switched beam smart antenna system. The particular research interest is focused on the performance of a multiple signal classification (MUSIC) algorithm and a RELAX algorithm. The study results show a higher angle resolution and a significant overall system benefit by using these two algorithms. We also discuss the non-uniform geometry arrangement of the array and its application to improve the capacity of direction finding further. Simulation results are presented.