| 摘要 |
An apparatus and a method for compensating for a frequency using a preamble are provided to improve accuracy of calculation for a frequency offset by delaying a received signal with a parallel structure, calculating a phase difference, and calculating an average value. An apparatus for compensating for a frequency using a preamble comprises a signal delaying part(210,211,212), a phase calculating part(213,215,216), an average calculating part(217,218,219), and an averaging part(220). In the signal delaying part, at least one or more delaying parts delaying a received first signal for a predetermined time and outputting the delayed signal are connected sequentially, and outputs at least one or more second signals having a different delay time, respectively. The phase calculating part obtains each pair of complex numbers of the second signals, performs a predetermined operation between each pair of the complex numbers and the first signal for obtaining phase difference, respectively. The average calculating part calculates an average value of the phase differences for a predetermined time. The averaging part calculates an average value for at least one or more average values of the average calculating part, and outputs the average value as a frequency offset.
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