Patent ID: 7729238

Claim:
A method for adjusting Fast Fourier Transform (FFT) window positioning in a Multi Band Orthogonal Frequency Division Multiplexing Ultra-Wideband (MB-OFDM UWB) system, the method comprising the steps of: (a) acquiring an initial FFT window position and a frequency hopping position; (b) demodulating a received signal of the MB-OFDM UWB system by using the initial FFT window position and the frequency hopping position acquired in said step (a); (c) transmitting received data information to a Media Access Control (MAC) layer using a reception frame (RX frame) structure and judging at the MAC layer whether or not a packet error is occurred based on Frame Check Sequences (FCSs); and (d) if no packet error occurs, returning to said step (b), and if the packet error occurs, changing a register map by using a predetermined interface line in a MAC-physical layer (MAC-PHY) interface to adjust the FFT window position and the frequency hopping position, and then returning to said step (b), wherein when the error is continuously detected by checking the FCSs at the MAC layer, said step (d) changes an “RXCTL” register map by using the predetermined interface line presented by the MAC-PHY interface protocol to cause the FFT window position to change in sequence, and repeats the process of again checking the FCSs for the changed FFT window position at the MAC layer to adjust the FFT window position.