Quaternionic vs. conventional factorizations for fixed-point 4-channel general paraunitary filter bank

Both a review and a comparison of die known factorizations for 4-channel general paraunitary filter bank are made from the perspective of its fixed-point hardware implementation on FPGA. The sensitivity to coefficient quantization, as well as the design and computational complexity are analyzed. The main aim is to refer quaternionic building block to dyadic-based factorizations and lifting schemes.