A Low-Complexity Mixed-Radix FFT Rotator Architecture

Wei Lun Tsai, Sau-Gee Chen, Shen Jui Huang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

FFT-based OFDM and SC-FDMA transmission technologies have been widely adopted in most advanced telecommunication systems. For future 5G mobile communication systems, FFT again is expected to play very crucial roles. As such, design of FFT processors with unprecedentedly high performance has become a hard challenging problem that must be overcome. Among the components of an FFT processor, the rotator composed of ROMs and multipliers for twiddle factor multiplications take up the most area and power consumption. In order to reduce the cost, a reconfigurable multiplier-less and ROM-less rotator design approach is proposed in this paper. This approach supports both power-of-Two and non-power-of-Two FFT lengths. It effectively reduces the area by applying a series of decomposition and sharing schemes. An example of a rotator supporting 128-2048/1536-point FFT processor for the 4G LTE system is implemented with TSMC 90nm CMOS technology. Compared to the existing design, this work has 16.75% area reduction and 62.94% power reduction.

Original languageEnglish
Title of host publication2018 IEEE Asia Pacific Conference on Circuits and Systems, APCCAS 2018
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages183-186
Number of pages4
ISBN (Electronic)9781538682401
DOIs
StatePublished - 8 Jan 2019
Event14th IEEE Asia Pacific Conference on Circuits and Systems, APCCAS 2018 - Chengdu, China
Duration: 26 Oct 201830 Oct 2018

Publication series

Name2018 IEEE Asia Pacific Conference on Circuits and Systems, APCCAS 2018

Conference

Conference14th IEEE Asia Pacific Conference on Circuits and Systems, APCCAS 2018
CountryChina
CityChengdu
Period26/10/1830/10/18

Keywords

  • FFT
  • mixed-radix
  • non-power-of-Two
  • twiddle factor

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    Tsai, W. L., Chen, S-G., & Huang, S. J. (2019). A Low-Complexity Mixed-Radix FFT Rotator Architecture. In 2018 IEEE Asia Pacific Conference on Circuits and Systems, APCCAS 2018 (pp. 183-186). [8605656] (2018 IEEE Asia Pacific Conference on Circuits and Systems, APCCAS 2018). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/APCCAS.2018.8605656