Multipath Direction Finding in Mobile Communication Scenarios Using Temporal Smoothing and Higher-order Cyclostationarity

摘要

In this paper, we improve on the previous higher order cyclostationarity (HOCS) based multi- path direction finding algorithm with a view to applicating it in real wireless scenarios, in which the received signals model of mobile terminal is with time-variant phase and amplitude of multipath reflection coefficient. The temporal smoothing technology is applied based upon different time instances. The method first divides the received wavefronts into coherent groups via estimation the steering vector of each group at different time instances using HOCS matrix, and then estimates the directions of each coherent group separately with temporal smoothing algorithm. Compared with all the previous HOCS-based methods, the proposed method achieves further array aperture extension as well as its powerful capability of noise-suppression and signal-selectivity by the use of HOCS. A maximum of (M-1)~2 angles of coherent signals of interest (SOIs) can be estimated with M-sensor ULA. The total number of signals (SOIs and interferences) impinging on antenna array can be more than (M-1)~2.