A low power and variable-length FFT processor design for flexible MIMO OFDM systems

Chun Lung Hung, Syu Siang Long, Muh Tian Shiue

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

14 Scopus citations

Abstract

In this paper, we present a low power and variable-length design of fast Fourier transform (FFT) processor for flexible MIMO-OFDM applications. In this work, mixed-radix-2/4/8 algorithm and new continuous-flow method are applied to achieve variable-length of 1K/2K/4K/8K points and in-order output. Furthermore, ping-pong cache memory architecture and optimized data scaling strategy are also applied to reduce main memory accesses up to 50% and achieve higher SQNR requirements of 16/64-QAM signals for multi-standards. A test chip of the proposed FFT processor has been designed and fabricated using CMOS 0.18μm 1P6M process with the core area of 4.96mm2. Our proposed processor can perform four independent data sequences of 2048-point FFT within 205.2 μs at operating clock rate of 20 MHz. The power consumption of calculating single 8192-point FFT sequence is only 20.88mW at operating clock rate of 10 MHz.

Original languageEnglish
Title of host publication2009 IEEE International Symposium on Circuits and Systems, ISCAS 2009
Pages705-708
Number of pages4
DOIs
StatePublished - 2009
Event2009 IEEE International Symposium on Circuits and Systems, ISCAS 2009 - Taipei, Taiwan
Duration: 24 May 200927 May 2009

Publication series

NameProceedings - IEEE International Symposium on Circuits and Systems
ISSN (Print)0271-4310

Conference

Conference2009 IEEE International Symposium on Circuits and Systems, ISCAS 2009
Country/TerritoryTaiwan
CityTaipei
Period24/05/0927/05/09

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