| 摘要 |
The present invention relates to a method for shortening the time taken for physical random access channel (PRACH) signal synchronization and preamble sequence detection in an LTE uplink system, and more particularly, to a method for shortening the time taken for preamble sequence detection using an inverse discrete Fourier transform. To this end, a preamble sequence detection apparatus according to the present invention comprises: a reference signal generation unit, which includes a preamble sequence generation unit for receiving a first signal having a predetermined length and outputting a plurality of second signals having the length of 839, a discrete Fourier transform unit for performing a discrete Fourier transform on the second signals received from the preamble sequence generation unit to transform the second signals into a frequency domain signal, a subcarrier mapping unit for mapping the frequency domain signal outputted from the discrete Fourier transform unit to a subcarrier, and an inverse discrete Fourier transform unit for receiving a signal having the length of 2 n from the subcarrier mapping unit and performing an inverse discrete Fourier transform to transform the received signal into a time domain signal having the length of 2 n ; a PRACH reception unit which receives a PRACH signal transmitted from a terminal; and a second correlation unit which detects a correlation between the reference signal received from the reference signal generation unit and a signal received from the PRACH reception unit. |
