Memory efficient DIT-based SDF IFFT for OFDM systems

IEICE Electronics Express

Ho-Yun Lee³  In-Gul Jang²  Jun-Ho Kim³  Kyung-Ju Cho¹  Jin-Gyun Chung³ 

[1] Department of Electronic Engineering, Wonkwang University;Electronics and Telecommunications Research Institute (ETRI);Division of Electronic Engineering, Chonbuk National University

关键词: IFFT;    memory reduction;    DIT;    SDF;   

DOI  :  10.1587/elex.11.20140010

学科分类：电子、光学、磁材料

来源: Denshi Jouhou Tsuushin Gakkai

【 摘 要 】

References(5)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.

【 授权许可】

Unknown