Rach reception by repeated use of data fft and concatenation of the resulting time signals

摘要

Methods and devices for extracting a random access channel (RACH) preamble are provided using as input a number of Fast Fourier Transformed (FFT) symbols, in order to extract the RACH preamble from a signal received in a base station from a user device in a radio communication system. An initial cyclic prefix (symbol CP) is removed prior to performing FFT on symbols. A phase adjustment is performed to compensate for group delays due to symbol CP gaps occurring when generating the baseband signal, the phase adjustment being determined individually for each symbol.