Space-time estimation techniques for UTRA system

This paper investigates the space-time channel estimation techniques in a multiple-access communication receiver system that receives coded digital data modulated using DS-CDMA, with an antenna array in a multipath propagation environment. A spatial and temporal channel model has been implemented, which is built upon the understanding of multipath fading and Doppler spread with merging time delay spread, direction-of-arrival and adaptive antenna array geometry. A receiver structure based on space-time processing has also been implemented, i.e. a reverse link, single-user (SU) with single antenna input (SI) at mobile and multiple antenna output (MO) at the base (SU-SIMO). A reverse link, multiuser (MU) SIMO has been presented as well. This paper also provides an overview of various methods available for estimation of DOA of a radio signal using an antenna array. Joint angle and delay estimation (JADE) combined with MUSIC is proposed as the main candidate for estimating the channel profile. For this purpose we present the performance of MUSIC as used in UTRA system