A Well-Arranged FIFO-Storage Distribution Design Plan for Fully Supporting 50 Different FFT Sizes in 3GPP-LTE Communication Applications

This paper presents a FIFO-Storage distribution design plan, which is an efficient FIFO arrangement for fully supporting 50 different FFT sizes pre-defined in 3GPP-LTE communication systems. Up to now, it is a first possible solution to deal with 50 various FFT sizes simultaneously. The total FIFO-storage length of our FIFO distribution plan needed is the same as the requirements of a purely single-mode SDF-based FFT design with 8192 points. By utilizing 20 distributed FIFO subbanks and suitable switch-controlling scheme on each FIFO reading/writing length access, the FIFO-storing can be easily realized without any main FIFO-bit circuit overhead.