Patent ID: 8385373

Claim:
A method of determining a boundary of a transmission structure in a time division duplexing (TDD) system comprising: detecting a power level of a radio frequency (RF) signal on at least one radio frequency, the RF signal comprising at least one subframe; time-domain correlating the detected power level of the RF signal with a predetermined known first reference signal and with a predetermined known second reference signal, wherein the first reference signal represents at least one subframe; and determining a location in time of a boundary of the at least one subframe of the detected RF signal based on the correlation of the detected power level of the RF signal with the first reference signal and the second reference signal; wherein time-domain correlating the detected power level of the RF signal with the first and second reference signals further comprises: correlating the first reference signal with the detected power level of the RF signal at a first point in time to calculate a correlation result for a maximum subframe overlap; correlating the second reference signal with the detected power level of the RF signal at the first point in time to calculate a correlation result for a minimum subframe overlap; summing the correlation results for the minimum subframe overlap and the maximum subframe overlap to calculate the correlation of the detected power level of the RF signal for a first point in time; and time shifting the first and second reference signals relative to the detected power level of the RF signal.