FPGA based architectures for high performance adaptive FIR filter systems

In this paper, we present a high performance adaptive FIR filter hardware architecture. In particular, the RLS (Recursive Least Square) algorithm for adaptive signal processing is explored based on QR decomposition, which is accomplished by using the Givens Rotation algorithm. The Givens Rotation algorithm is implemented using a systolic array and LUT-based Newton´s method. This architecture is suitable for high-speed FPGAs or ASIC designs. It also solves the tradeoff between throughput and latency issues. As a case study, this QR design is tested using Xilinx XC5VLX110T FPGA. The findings show that the system is capable of running the QR decomposition at up to 200MHz with 56 clock cycles latency.