发明名称 |
INDICATING AND DETECTING THE START OF SIGNAL TRANSMISSION EMPLOYING FREQUENCY DIVISION MULTIPLEXING |
摘要 |
A modem for use with a subsea transmission line comprises a digital signal processor responsive to a succession of segments of a data signal to produce a respective set of orthogonal frequency division multiplexed signals and to transmit those signals as a burst on the transmission line, and to prepend the burst with a start signal comprising a cyclically time-varying signal envelope-modulated with a Gaussian waveform. The modem is also arranged to convert signals received from the transmission line into a succession of digital samples and to process those samples to obtain an indication of the peak of the Gaussian waveform whereby to provide a datum for decoding a received burst of OFDM signals.
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申请公布号 |
US2010220773(A1) |
申请公布日期 |
2010.09.02 |
申请号 |
US20080595913 |
申请日期 |
2008.02.12 |
申请人 |
CARTER RICHARD H;HATHAWAY MARK |
发明人 |
CARTER RICHARD H.;HATHAWAY MARK |
分类号 |
H04L27/28;H04B1/38;H04B3/00 |
主分类号 |
H04L27/28 |
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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