A 128/256-point pipeline FFT/IFFT processor for MIMO OFDM system IEEE 802.16e

In this paper, we present a novel 128/256-point FFT/ IFFT processor for the applications in IEEE 802.16e based on MIMO-OFDM. The pipeline FFT architecture is proposed to efficiently deal with 1-4 multiple data sequences, and increase the throughput. Furthermore, less hardware complexity is needed in our design compared with conventional individual parallel approach. The signal-to-quantization noise ratio (SQNR) is 42.7 dB. The proposed FFT has been designed in 0.13 μm technology with the core size of 1.470 × 1.469 mm².