Patent ID: 8718167

Claim:
A method for allowing a terminal to perform channel estimation in a base station of a wireless communication system, the method comprising: generating a training signal with a specific waveform for each transmission antenna such that the terminal measures a downlink channel impulse response for each transmission antenna, and transmitting the training signal to the terminal; and causing the base station to receive downlink channel information that relates to a downlink channel measured based on the downlink channel impulse response from the terminal, and to perform fast Fourier transform (FFT) to indirectly acquire full channel status information (CSI), wherein the training signal is an orthogonal frequency division multiplexing (OFDM) impulse signal having an effective OFDM signal and a cyclic prefix (CP), and wherein, when the length of a channel impulse response is shorter than the effective OFDM impulse signal, a rear part of the effective OFDM impulse signal is copied and used as the CP.