Memory efficient IFFT design for OFDM-based applications

In this paper, we propose a new memory efficient IFFT design method for OFDM-based applications, based on a signed integer mapping of three IFFT input signals which are composed of modulated data, pilot and null signals. The proposed method focuses on reducing the word size of memory in the first two stages of the single-path delay feedback (SDF) IFFT architectures since the first two stages require 75% of the overall memory. By Synopsys simulation of the first two stages of IFFT, it is shown that the proposed method achieves about 40% reduction in area and 44% reduction in power consumption compared with the previous work.