On the application of DOA estimation techniques to UMTS system
E. Del Re, Laura Pierucci, S. Marapodi · 2003
The paper describes the application of multiple signal classification (MUSIC) and its derivative algorithms to the estimation of direction of arrival (DOA) of multipath signals received from multiple users on the uplink of a wideband direct sequence code division multiple access (wideband DS-CDMA) system. Due to the multiple-access interference (MAI) and multipath, a high number of signals impinge on the antenna array and this scenario causes conventional direction-finding algorithms (such as MUSIC) to fail. The proposed approach extends the use of MUSIC and allows to provide unique estimates even when the number of DOAs exceeds the number of antenna array elements.