Patent ID: 7924953

Claim:
An apparatus for detecting a time-frequency code in a Multi-Band Orthogonal Frequency Division Multiplexing Ultra Wideband (MB-OFDM UWB) receiving apparatus having a Radio Frequency (RF) receiver, a modem and a Media Access Control (MAC) receiver, the apparatus comprising: a controller for providing a band selection signal to the RF receiver and outputting a preamble selection signal at regular symbol periods to calculate a cross correlation value for a predetermined time period more than a beacon frame interval when a time-frequency code search start signal is received from the MAC receiver; and a cross correlation means for storing information on preamble patterns, selecting a preamble stored depending on the preamble selection signal from the controller, and calculating a cross correlation value for a digital signal transferred through the RF receiver, wherein the controller determines a time-frequency code using a preamble where a peak occurs as a time-frequency code that is currently in use when a peak signal is inputted based on the calculated cross correlation value from the cross correlation means, and transmits the determined time-frequency code to the MAC receiver.