IEICE Electronics Express
Online ISSN : 1349-2543
ISSN-L : 1349-2543
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Memory efficient DIT-based SDF IFFT for OFDM systems
Ho-Yun LeeJun-Ho KimIn-Gul JangKyung-Ju ChoJin-Gyun Chung
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Keywords: IFFT, memory reduction, DIT, SDF
JOURNAL FREE ACCESS

2014 Volume 11 Issue 5 Pages 20140010

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Abstract

This paper presents a new memory reduction method of IFFT for OFDM systems, based on a mapping of three IFFT input signals which consist of modulated data, pilot and null signals. The proposed method focuses on reducing the memory size in the bit-reversal part which requires the largest number of memory cells in IFFT architectures. To reduce the memory size, we propose a decimation-in-time (DIT) twiddle factor shifting algorithm to remove the multiplications in the first two stages. It is shown that the proposed method achieves a memory reduction of about 30% compared to previous methods.

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© 2014 by The Institute of Electronics, Information and Communication Engineers
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