Patent ID: 7792201

Claim:
An apparatus for determining a pilot pattern in a wireless communication system, comprising: an orthogonal frequency division multiplexing (OFDM) demodulator for generating frequency-domain data by fast-Fourier-transform (FFT)-processing a received signal; and a pilot pattern decider for calculating a coherence bandwidth and a coherence time using subcarrier values received from the OFDM demodulator, and selecting one of a plurality of pilot patterns according to a ratio of the coherence bandwidth to the coherence time, wherein the pilot pattern decider comprises: a mean square error (MSE) calculator for calculating the MSE of each of the subcarrier values; a first calculator for calculating the coherence bandwidth by accumulation the MSEs along a frequency axis; a second calculator for calculating the coherence time by accumulation the MSEs along a time axis; and a pattern selector for selecting the pilot pattern according to the ratio of coherence bandwidth to the coherence time.