Blind delay and DOA estimation in correlated multipath DS-CDMA systems
A joint delay and DOA (direction of arrival) es- timation algorithm in the frequency-selective fading channel with correlated multipaths is proposed for short code DS- CDMA systems in this work. The received 2-D space-time data is first decomposed by a beamforming filterbank. Then, we develop a technique based on zero-forcing equalization (ZFE) to remove the correlated multipaths effect and apply the minimum output energy (MOE) criterion at each beam- forming filter output. The cascaded ZFE/MOE method can estimate multipaths effectively. Finally, the soft-output, which is the estimated power from each beamforming filter output, provides the information for DOA estimation.