A variable-length FFT processor for 4×4 MIMO-OFDM systems

  title={A variable-length FFT processor for 4×4 MIMO-OFDM systems},
  author={C. Y. Hung and P. F. Chiu and Yuan-Hao Huang},
  journal={Proceedings of 2010 International Symposium on VLSI Design, Automation and Test},
In this paper, we present a 128∼2048-point variable-length FFT processor for 4×4 MIMO-OFDM systems. In general, we must use n FFT processors for the n×n MIMO-OFDM system, and only 1/r operation time is employed for radix-r pipeline butterfly processor. This increases hardware cost and reduces hardware efficiency in VLSI implementation. Therefore, we propose radix-42 algorithm to deal with four data sequences simultaneously and a butterfly sharing technique to improve the hardware utilization… CONTINUE READING


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