1. A method for a processing circuit comprising: selecting a channel estimation filter from a plurality of channel estimation filters based on a channel quality metric, the selected channel estimation filter being associated with an intrinsic coefficient; determining a scaled coefficient, the scale coefficient being based on scaling the intrinsic coefficient with respect to a bit size constraint, the bit size constraint being determined by a bit length of a multiplication circuitry operand; and generating an output based on the scaled coefficient and an input signal.