发明名称 |
Method and arrangement for automatic frequency control in a communication system |
摘要 |
An arrangement (900), method and unit for AFC in a communication system (100) having: a frequency estimator (980) producing a decision-directed frequency estimate from a received signal; and an AFC loop receiving the decision-directed frequency estimate and performing therewith frequency control. The AFC process may use a CRC-decision directed frequency estimate as the final stage in a multi-stage AFC process (preceded by SCH- and midamble-derived frequency estimate stages), such that a verified received data sequence is used to re-construct a local copy of the ideal received data symbols expected at the output of a detector. This local copy is then correlated with the actual detector output and the results used to estimate the frequency error present on the received signal. The AFC process is inherent suited for discontinuous receive (DRX) applications. This provides the advantage of allowing required frequency correction accuracy to have minimal impact on the error rate of the received data in various channel configurations.
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申请公布号 |
US8014475(B2) |
申请公布日期 |
2011.09.06 |
申请号 |
US20040556560 |
申请日期 |
2004.05.17 |
申请人 |
WIRELESS TECHNOLOGY SOLUTIONS LLC |
发明人 |
HOWARD PAUL |
分类号 |
H04L27/06;H03J7/02;H04L27/00;H04L27/227 |
主分类号 |
H04L27/06 |
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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