Abstract:
Possibility of the pipelining technique application in a highly nonstationary two-dimensional (2D) frequency-modulated (FM) signals estimation is considered in this paper. The considered design technique allows the implemented filter to overlape in execution unconditional steps performing in neighboring space/spatial-frequency (S/SF) instants and, consequently, to significantly improve execution time of the 2D nonstationary Wiener filter based on the 2D cross-terms-free Wigner distribution (2D CTFWD) real-time implementation and on the 2D CTFWD-related local frequency (LF) estimation in a noisy environment. In this way, the improvement in execution time corresponding to the one clock cycle (CLK) by a S/SF point is achieved, which means that the improvement by a S/SF point can reach 50% in most S/SF points. The design and its improvement in execution time are tested on the monocomponent and multicomponent highly nonstationary noisy signals.
Key words: Cross-terms free Wigner distribution, Space/Spatial-frequency representation, Optimal filter, Hardware implementation, Pipelining