Design and implementation of configurable FFT/IFFT in the LTE system
Wang Yang · Journal of Xidian University · 2010
A design of the variable-point FFT/IFFT for non-2n is proposed in consideration of the characteristics of the variable-length and non-2n subcarriers in the 3GPP LTE system.A high speed and configurable FFT/IFFT is designed by using the mixed radix with radix-2,radix-3,and radix-4 based on the pipelined ping-pong architecture.It will save about 100 kbits storage space since all the twiddle factors are stored in the same space and RAM is shared by I/O data after optimizing the address generation unit.Simulation results show that the design can satisfy the need of the FFT/IFFT for different bandwidths in a high-speed LTE system.