发明申请
US20050152326A1 Frequency error estimation and frame synchronization in an OFDM system
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OFDM系统中的频率误差估计和帧同步
- 专利标题: Frequency error estimation and frame synchronization in an OFDM system
- 专利标题(中): OFDM系统中的频率误差估计和帧同步
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申请号: US10754796申请日: 2004-01-08
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公开(公告)号: US20050152326A1公开(公告)日: 2005-07-14
- 发明人: Rajiv Vijayan , Alok Gupta , Raghuraman Krishnamoorthi
- 申请人: Rajiv Vijayan , Alok Gupta , Raghuraman Krishnamoorthi
- 主分类号: H04L27/26
- IPC分类号: H04L27/26 ; H04J11/00
摘要:
Frequency error estimation and frame synchronization are performed at a receiver in an OFDM system based on a metric that is indicative of detected pilot power. The metric may be defined based on cross-correlation between two received symbols obtained in two OFDM symbol periods. For frequency error estimation, a metric value is computed for each of multiple hypothesized frequency errors. The hypothesized frequency error for the metric value with the largest magnitude is provided as the estimated frequency error. For frame synchronization, a correlation value is obtained for each OFDM symbol period by correlating metric values obtained for NC (e.g., most recent) OFDM symbol periods with NC expected values. The expected values are computed in a manner consistent with the manner in which the metric values are computed. Peak detection is performed on the correlation values obtained for different OFDM symbol periods to determine frame synchronization.
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