Abstract
In this paper, our objective is to detail know-how and techniques that can help the designer of electronic circuits to develop and to optimize their own IP in a reasonable time. For this reason, we propose to optimize existing FFT algorithms for low-cost FPGA implementations. For that, we have used short length structures to obtain higher length transforms. Indeed, we can obtain a VLSI structure by using log4(N) 4-point FFTs to construct N-point FFT rather than (N/8) logs (N) 8-point FFTs. Furthermore, two techniques are used to yield with VLSI architecture. Firstly, the radix-4 FFT is modified to process one sample per clock cycle. Secondly, the memory is shared and divided into 4 parts to reduce the consumed resources and to improve the overall latency
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