VLSI BASED Mixed-Radix 8-2 Butterfly FFT with bit reversal for 802.11a

Authors

  • VISHNU U K

DOI:

https://doi.org/10.20894/IJMSR.117.002.001.011

Keywords:

OFDM, FFT/IFFT, VLSI, VHDL, Mixed Radix with bit reversal.

Abstract

OFDM has received a great deal of attention and been adopted in many new generation wideband data communication systems such as IEEE 802.11a. In these communication systems the different applications mentioned above have different demands in operation speed and length of FFT/IFFT. The modified Mixed Radix 8-2 Butterfly FFT with bit reversal for the output sequence derived by index decomposition technique is our proposed VLSI system architecture to design the prototype FFT/IFFT processor for OFDM systems. In this paper the analysis of FFT algorithms such as mixed radix 4-2 and mixed radix 8-2 were designed using VHDL. The results show that the proposed processor architecture can greatly save the area cost while keeping a high-speed processing speed, which may be attractive for many real-time systems. By using the proposed structure, the proposed algorithm makes an offer the simple bit reversal mechanism which is only supported by a fixed radix FFT algorithm.

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Author Biography

VISHNU U K

PROF/ECE, LORD VENKATESWARA ENGINEERING COLLEGE,WALLAJABAD,KANCHIPURAM

References

[1] Byung G. Jo and Myung H. Sunwoo,2005, "New Continuous-Flow Mixed-Radix (CFMR) FFT Processor Using Novel In- Place Strategy", IEEE Transactions on Circuits and Systems, Vol. 52, No. 5.

[2] Daisuke Takahashi,2001,"An Extended Split-Radix FFT Algorithm", IEEE Signal Processing Letters, Vol. 8, No. 5, pp. 145-147.

[3] Gordon L. Demuth,1989 "Algorithms for Defining Mixed Radix FFT Flow Graphs", IEEE Trans Acoust, Speech, and Signal Processing, Vol. 37, No. 9, pp. 1349-1358.

[4] C. Sidney Burrus, "Index Mapping for Multidimensional Formulation of the DFT and Convolution", IEEE Trans. Acoust., Speech, and Signal Processing, Vol. ASSP-25, June. 1977, pp. 239-242.

[5] Lihong Jia, Yonghong GAO, Jouni Isoaho, and Hannu Tenhunen, "A New VLSI-Oriented FFT Algorithm and Implementation", IEEE ASIC Conf., Sep. 1998, pp. 337-341.

[6] Martin Vetterli and Pierre Duhamel, "Split-Radix Algorithms for Length-ptmDFT's", IEEE Trans. Acoust, Speech, and Signal Processing, Vol. 37, No. 1, Jan. 1989, pp. 57-64.

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Published

2010-12-18

Issue

Vol. 2 No. 1 (2010)

Section

Articles

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