Super-resolution DOA estimation in switch beam smart antenna

Abstract

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.