Short Data Record DoA and Timing Estimation in Multipath DS/CDMA Systems

We consider the problem of joint direction-of-arrival (DoA) and time delay estimation for antenna-array DS/CDMA systems operating in multipath propagation environments where signal coherency can severely deteriorate the estimation accuracy. We propose two MUSIC-type algorithms based on the spatial smoothing technique that essentially break the coherency of the multipath signals. The proposed algorithms utilize space-time received vectors that span only a single information symbol period and exhibit superior performance when the data record size available for parameter estimation is limited.