Area-efficient pulse-shaping 1:4 interpolated FIR filter based on LUT partitioning

The design of an area-efficient pulse-shaping 1:4 interpolation FIR filter with a partitioned LUT structure is described. Since the LUT block of the FIR filter occupies a large area relative to that of other blocks, in the proposed FIR filter design the LUT size is reduced by partitioning, exploiting coefficient symmetry, and sharing the partitioned LUTs by multiplexing input data streams. Experiments show that in the proposed filter the area is reduced by >40% compared to the popular single-architecture dual-channel filter. The proposed FIR filter produces optimised results in the QPSK modulator