Novel reconfigurable architecture with low complexity FIR filter

Reconfigurability and low complexity are two key requirements of Finite Impulse Response (FIR) filters employed in multi-standard wireless communication systems. In this paper, two new reconfigurable architectures of low complexity FIR filters are proposed, namely Constant Shift Method and Programmable Shift Method. The proposed FIR filter architecture is capable of operating for different wordlength filter coefficients without any overhead in the hardware circuitry. This reconfigurable architecture filters can be efficiently implemented by using common subexpression elimination (CSE) algorithm. Design examples show that the proposed 3 bit Binary Common Subexpression Elimination Constant Shift Method architecture offer speed improvement and Programmable Shift Method architecture offer area and power reduction compared to existing reconfigurable FIR filter.