发明名称 |
COMMUNICATIONS DEVICE AND RELATED METHOD WITH IMPROVED ACQUISITION ESTIMATES OF FREQUENCY OFFSET AND PHASE ERROR |
摘要 |
A repeated preamble bit or symbol pattern such as for a binary phase shift keyed (BPSK) communications signal is received within a modem. An initial frequency offset and phase error estimate is generated by processing a Fast Fourier Transform (FFT) that detects the repeated preamble pattern for a block of samples within the communications signal. Two halves of the block of samples are correlated with a plurality of different BPSK shifted sequences to obtain a symbol timing alignment based on the shifted sequence providing the maximum correlation value. A frequency offset estimate is iteratively updated an N number of times using the shifted sequence providing the maximum correlation value to refine an acquisition estimate of the frequency offset and phase error of the received communications signal.
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申请公布号 |
US2009154601(A1) |
申请公布日期 |
2009.06.18 |
申请号 |
US20070954260 |
申请日期 |
2007.12.12 |
申请人 |
HARRIS CORPORATION |
发明人 |
FURMAN WILLIAM N.;NIETO JOHN W.;TYLER WILLIAM L. |
分类号 |
H04L27/22 |
主分类号 |
H04L27/22 |
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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