Abstract :
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
Keywords :
space-time adaptive processing; DOA estimation; DS-CDMA; Doppler spread; MUSIC; UTRA system; adaptive antenna array geometry; channel profile estimation; direction-of-arrival; joint angle/delay estimation; mobile antenna output; modulated coded digital data; multipath fading; multipath propagation environment; multiple antenna output; multiple-access communication receiver system; multiuser SIMO; radio signal; receiver structure; reverse link; single antenna input; single-user; space-time channel estimation; space-time processing; spatial channel model; temporal channel model; time delay spread;
