FAST PIPELINED CORDIC-BASED ADAPTIVE LATTICE PREDICTOR - ALGORITHMS AND ARCHITECTURE

The authors present a novel CORDIC-based adaptive algorithm and a pipe lined architecture for unnormalised lattice prediction filter. Previou sly, they have presented a CORDIC-based adaptive lattice filtering (CA LF) algorithm for normalised lattice filters which features a sign-sig n direct (rotation) angle updating scheme (Hu and Liao, 1992). The aut hors consider a delayed CALF (DeCALF) algorithm in which the rotation angle is updated based on 'delayed' prediction errors. In doing so, th ey are able to develop a fully pipelined implementation of DeCALF whic h achieves B-fold throughput rate increase where B is the number of CO RDIC iterations (stages). This is accomplished at insignificant hardwa re overhead and minor parameter tracking performance degradation.