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In this paper, we propose a multiplier-reduction (MUL-RED) Radix-2 Pipeline FFT processor for 802.11ah IoT sensors. Utilizing the symmetry of Twiddle factors we show two ideas to reduce the hardware cost and power consumption. Firstly, the complex-multipliers in the last 4 layers are replaced by gain blocks. Secondly, in the remained layers we store only one fourth of the required Twiddle factors...
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