Patent ID: 8670402

Claim:
A method for transmitting a physical random access channel signal, the method comprising: when a terminal transmits a physical random access channel (PRACH) signal, after carrying out pre-compensation for a frequency domain signal according to an estimated frequency spectrum gain of a downlink channel, implementing an Inverse Fast Fourier Transform operation for the pre-compensated frequency domain signal to obtain the time domain signal; after inserting a cyclic prefix, transmitting the time domain signal to the base station; the step of carrying out the pre-compensation for the frequency domain signal according to the frequency spectrum gain comprises: multiplying the frequency domain signal mapped to each subcarrier by a reciprocal of the frequency spectrum gain of the subcarrier Wherein if the frequency spectrum gain of frequency z estimated by the terminal is h z , carry out the pre-compensation for the frequency domain signal S(m) at the subcarrier m as follows: {tilde over (S)} ( m )= S ( m )/ h (m+k 0 )Δf RA wherein {tilde over (S)}(m) is the pre-compensated frequency domain signal at the subcarrier m, k 0 is an initial frequency of transmission of the PRACH signal, and Δf RA is a frequency interval between adjacent subcarriers of the PRACH signal.