Memory Size Reduction Technique of SDF IFFT Architecture for OFDM-Based Applications

作者：Jang In Gul; Cho Kyung Ju^*; Kim Yong Eun; Chung Jin Gyun

来源：IEICE TRANSACTIONS ON COMMUNICATIONS, 2012, E95B(6): 2059-2064.

DOI：10.1587/transcom.E95.B.2059

• IFFT
• single-path delay feedback
• memory size reduction
• combined integer mapping

In this paper, to reduce the memory size requirements of IFFT for OFDM-based applications, we propose a new IFFT design technique based on a combined integer mapping of three IFFT input signals: modulated data, pilot and null signals. The proposed method focuses on reducing the size of memory cells in the first two stages of the single-path delay feedback (SDF) IFFT architectures since the first two stages require 75% of the total memory cells. By simulations of 2048-point IFFT design for cognitive radio systems, it is shown that the proposed IFFT design method achieves more than 13% reduction in gate count and 11% reduction in power consumption compared with conventional IFFT design.

• 出版日期2012-6