发明授权
US08416759B1 Carrier frequency offset and doppler frequency estimation and correction for OFDMA and SC-FDMA
有权
OFDMA和SC-FDMA的载波频率偏移和多普勒频率估计和校正
- 专利标题: Carrier frequency offset and doppler frequency estimation and correction for OFDMA and SC-FDMA
- 专利标题(中): OFDMA和SC-FDMA的载波频率偏移和多普勒频率估计和校正
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申请号: US12848043申请日: 2010-07-30
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公开(公告)号: US08416759B1公开(公告)日: 2013-04-09
- 发明人: Ravi Narasimhan , Shi Cheng
- 申请人: Ravi Narasimhan , Shi Cheng
- 申请人地址: US CA Sunnyvale
- 专利权人: Applied Micro Circuits Corporations
- 当前专利权人: Applied Micro Circuits Corporations
- 当前专利权人地址: US CA Sunnyvale
- 代理机构: Turocy & Watson, LLP
- 主分类号: H04B7/208
- IPC分类号: H04B7/208
摘要:
A system and method are provided for carrier frequency offset (CFO) and Doppler frequency estimation and correction for Orthogonal Frequency-Division Multiple Access (OFDMA) and Single Carrier-Frequency-Division Multiple Access (SC-FDMA) signals in a wireless communications receiver. The receiver is capable of accepting a plurality of multicarrier signals transmitted simultaneously from a plurality of transmitters, with overlapping carrier frequencies and orthogonal reference signals. For each multicarrier signal, a channel estimate is performed and the channel is equalized. Then, a frequency offset is estimated between the transmit carrier frequency of each multicarrier signal and a receiver local oscillator frequency using either the phase rotation of data constellations as a function of time or the phase rotation of channel estimates as a function of time. The receiver supplies the CFO/Doppler frequency estimates and corrects the equalized symbols prior to demodulation.
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