A 128 FFT Core Implementation for Multiband Full-Rate Ultra-Wideband Receivers

MultiBand OFDM (MB-OFDM) is a short-range wireless technology that permits data transfers at very high rates, between 53.3 and 480 Mbps. MB-OFDM uses the already licensed radio spectrum, between 3.1 GHz - 10.6 GHz, in an unlicensed manner, i.e. without a licensing cost or control. MB-OFDM divides the spectrum allocated to UWB into 14 bands of 528 MHz. Each OFDM symbol is transmitted across a band. The FFT processor is a crucial block in multi-carrier systems like OFDM, being responsible by thje demodulation of the OFDM symbol. In this paper we discuss the design of 128-point Pipeline FFT modules optimized for use in OFDM based UWB receiver system to be implemented on a FPGA using Xilinx FFT CORE Generator.