发明名称 |
APPARATUS AND METHOD FOR ESTIMATING FREQUENCY OFFSET IN UPLINK OF ORTHOGONAL FREQUENCY DIVISION MULTIPLE ACCESS SYSTEM |
摘要 |
An apparatus and a method for estimating a frequency offset in an uplink of an OFDMA(Orthogonal Frequency Division Multiple Access) system are provided to estimate a frequency offset efficiently without inducing power consumption and complexity of a base station receiver. An apparatus for estimating a frequency offset in an uplink of an OFDMA system includes an observation window setting unit(701), a fourier transform unit(702), a phase compensation unit(703), a subcarrier selector(704), and a frequency offset estimation unit(706). The observation window setting unit outputs at least two time domain signals having a predetermined time delay difference from a received signal through first and second observation windows having a different time delay. The fourier transform unit transforms at least two time domain signals to at least two frequency domain signals. The phase compensation unit compensates a phase change by a time delay difference between the first observation window and the second observation window. The subcarrier selector selects subcarriers of a specific user for estimating the frequency offset in at least two frequency domain signals of which a phase change is compensated. The frequency offset estimation unit calculates a phase difference of subcarriers having the same subcarrier index from the selected subcarriers. The frequency offset estimation unit estimates a frequency offset for a received signal of a specific user based on the phase difference. |
申请公布号 |
KR20080001998(A) |
申请公布日期 |
2008.01.04 |
申请号 |
KR20060060523 |
申请日期 |
2006.06.30 |
申请人 |
SAMSUNG ELECTRONICS CO., LTD. |
发明人 |
HWANG, JONG YOON;CHO, DONG KYOON;WHANG, KEUM CHAN;KIM, KWANG SOON |
分类号 |
H04L27/26;H04B7/26 |
主分类号 |
H04L27/26 |
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地址 |
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