Design of multiplierless cosine modulated filterbank using hybrid technique in sub-expression space

In this paper, an optimal design technique for M-channel multiplierless cosine modulated filterbank (CMFB) is proposed using common sub-expression technique (CSE) and hybrid method with given roll-off factor (RF) and stopband attenuation (AS). The key feature of the proposed method is utilization of single optimization algorithm to generate optimal quantized and canonic signed digit (CSD) converted coefficients that satisfy the magnitude response of 0.7071 at frequency ω= π /2M. CSE is employed to reduce the hardware requirement (adders) of a designed filter. Hybrid technique is based on the concept of particle swarm optimization (PSO) and artificial bee colony (ABC) algorithm. A comparative analysis of different CSE algorithms has been made, and performance of the proposed method is evaluated in term of adders.