The Ultra Wide-Band Multi Band-Orthogonal Frequency Division Multiplexing (UWBMB-OFDM) systemis a low power (– 41.3 dBm/MHz); short-range (less than 10 m); high speed (53.3 - 480 Mbps) wireless technology with spectral band widthfrom 3.1GHz to 10.6 GHz allocated by Federal Communications Commission (FCC) according to IEEE 802.15.3a standard. The UWB spectrum is divided into 14 subbands, each with 528 MHz bandwidth . Each OFDM symbol is transmitted / received a cross each subband using a single 128-point radix2 IFFT/FFT.
In this paper a simulation software is written using Matlab version 10 to evaluate the Bit Error Rate (BER) of the system using the traditional 128-point IFFT/FFT algorithm, and the proposed 4-parallel 32-point radix2 IFFT/FFT algorithm. It has been shown that a time saving is 28.7 % , and that the BER is better off 5dB using the proposed method as compared to traditional method.