Improved Double Angle Complex Rotation QRD-RLS

In recent years, the classic method of Coordinate Rotation by Digital Computer (CORDIC) arithmetic has been widely implemented as part of the computational requirements of the well known QR-RLS (Recursive Least Squares) algorithm. In order to operate Givens rotation on a complex number system, double angle complex rotation (DACR) was adopted to simplify the computational requirement of Complex Givens Rotation. This paper presents a new architecture of high speed CORDIC based single Processor Element (PE) that can be used to accomplish the complex value QR update based RLS. The implementation results on Xilinx FPGA implementaton demonstrates that the proposed structure results in a lower latency and lower cost.