DESIGN AND ARCHITECTURE OF MULTIPLIER-FREE FIR FILTERS USING PERIODICALLY TIME-VARYING TERNARY COEFFICIENTS

Multiplier-free realizations for FIR filters are proposed. The realiza tions use the periodically time-varying (PTV) system, flanked by simpl e units for upsampling and downsampling to achieve time-invariant mult iplier-free FIR filter operation. The PTV system uses only ternary ({0 , +/- 1}) coefficients, and the units before and after the PTV system use only power-of-two scalers. Therefore, the realizations can be impl emented with only add/subtract operations. Some architectures for the proposed structures are also presented.