Timing estimation method of random access preamble, random access preamble detection method, and random access preamble detection apparatus

A timing estimation method of a random access preamble of a base station, the method comprising:

• removing a cyclic prefix (CP) from a received signal;
• detecting a plurality of first symbols corresponding to a plurality of first subcarriers allocated to a random access channel from the received signal with the CP removed;
• accumulating reception power of the first symbol corresponding to each of the plurality of first subcarriers according to a frequency hopping pattern;
• detecting a plurality of second subcarriers allowed to a terminal to transmit a preamble sequence using each of accumulated values of reception power of the plurality of first subcarriers;
• performing inverse fast Fourier transform (IFFT) using a plurality of third subcarriers used to transmit the preamble sequence among the plurality of second subcarriers;
• and
• estimating timing offset of the preamble sequence based on a time domain signal with maximum energy among a plurality of time domain signals generated as a result of the IFFT.

A random access preamble detection apparatus comprising:

• a processor,
• wherein the random access preamble detection apparatus is configured to:
• remove a cyclic prefix (CP) from a received signal and to output the received signal;
• detect a plurality of first symbols corresponding to a plurality of first subcarriers included in an uplink available resource from an output signal of the CP remover;
• and
• accumulate reception power with respect to each of a plurality of second subcarriers allocated to a random access channel among the plurality of first subcarriers according to a predetermined frequency hopping pattern, and
• upon completely accumulating reception power according to the frequency hopping pattern, detect a preamble sequence using each accumulated value of reception power of each of the plurality of second subcarriers.