发明名称 |
Residual frequency, phase, timing offset and signal amplitude variation tracking apparatus and methods for OFDM systems |
摘要 |
An error tracking apparatus and method for tracking a residual frequency error, a phase error, a timing error, and a signal amplitude variation to enhance a phase error tracking performance and a tracking speed in an orthogonal frequency division multiplexing (OFDM) system is provided. The error tracking apparatus and method include: a frequency error corrector for correcting a frequency at a time domain by adding a tracking carrier error estimating value to an initial carrier frequency error estimating value; a signal amplitude tracking corrector for controlling a signal amplitude by multiplying an input signal converted by a fast Fourier transform (FFT) by an output value corresponding to a calculated power of a receive pilot signal; a channel corrector for outputting a channel correcting signal by multiplying the receive pilot signal by a complex conjugate of a frequency channel response of the receive pilot signal; a carrier frequency error estimator for estimating a carrier frequency error parameter using the channel-corrected pilot and providing the tracking carrier frequency error estimating value; a time offset estimator for estimating a time offset parameter using the channel-corrected pilot; and a carrier phase error estimator for estimating a carrier phase error parameter using the channel-corrected pilot.
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申请公布号 |
US2006133527(A1) |
申请公布日期 |
2006.06.22 |
申请号 |
US20050286996 |
申请日期 |
2005.11.22 |
申请人 |
YU HEEJUNG;JEON TAEHYUN;KIM MYUNG-SOON;CHOI EUN-YOUNG;LEE SOK-KYU;LYU DEUK-SU |
发明人 |
YU HEEJUNG;JEON TAEHYUN;KIM MYUNG-SOON;CHOI EUN-YOUNG;LEE SOK-KYU;LYU DEUK-SU |
分类号 |
H04K1/10;H03D1/04 |
主分类号 |
H04K1/10 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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