A polyphase-filter-based FFT for DFT calculation in LTE uplink

Yanbin Yao, Yongtao Su, Shoujun Huang, Jinglin Shi

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

1 Citation (Scopus)


In LTE uplink, a DFT with 34 possible lengths is performed. The traditional method directly transforms the sequences with different lengths by using the mixed-radix FFT which is not appropriate to apply on the DSP processor only supplying radix-2 butterfly hardware especially. In this paper, we resample the arbitrary-length input sequence so that a 2n-point FFT can be applied by using the polyphase filter. Theoretical analysis demonstrates the equivalence of the proposed polyphase-filter-based FFT (PF-FFT) and the original DFT. Moreover, the PF-FFT also keeps low complexity and good fixed-point performance.

Original languageEnglish
Title of host publicationICC 2013
Subtitle of host publicationIEEE International Conference on Communications : proceedings
EditorsDong-In Kim, Peter Mueller
Place of PublicationPiscataway, NJ
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Number of pages5
ISBN (Electronic)9781467331227
Publication statusPublished - 2013
Externally publishedYes
EventIEEE International Conference on Communications - Budapest, Hungary
Duration: 9 Jun 201313 Jun 2013


OtherIEEE International Conference on Communications


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