Bit parallel multiplication based 64 Point Pipeline FFT Processor for OFDM application
Bhawna Kalra, J.B. Sharma · 2016
Orthogonal frequency division multiple access is a technique in which single data stream is transmitted with small rate of subcarriers. OFDM system needs FFT processor for generation of subcarriers. A Radix-2 Based 32 bit and 64 Point Pipeline FFT Processor Using bit parallel multiplication process for OFDM system is presented in this paper. Proposed architecture uses single path delay feedback FFT architecture. This is an ROM less architecture. In this architecture ROM is replaced by complex constant multiplier and all twiddle factors are multiplied using bit parallel multiplication module. Pipelining methodology provides good latency to the FFT processor. Propagation delay of proposed architecture is calculated by test bench waveform on Xilinx ISE simulator and it is equal to 630ns at 10ns clock period. Due to small propagation delay speed of the OFDM system gets increases and latency also gets improve.