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

In-Gul JANG  Kyung-Ju CHO  Yong-Eun KIM  Jin-Gyun CHUNG  

Publication
IEICE TRANSACTIONS on Communications   Vol.E95-B   No.6   pp.2059-2064
Publication Date: 2012/06/01
Online ISSN: 1745-1345
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
Keyword: 
IFFT,  single-path delay feedback,  memory size reduction,  combined integer mapping,  

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Summary: 
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.