发明名称 |
Method of detecting the frequency deviation in digital communication transmissions |
摘要 |
The invention discloses a method of measuring the rough frequency deviation in digital communication transmissions with echo propagation, particularly in the short-wave domain. A repeatedly transmitted PN sequence serves as the preamble of a data block. This PN sequence is compressed at the receiving end in matched filters provided in each one of a plurality of simultaneous, frequency offset Doppler channels. The Doppler channel having the greatest amplitude in the quadrature signal is selected for a determination of the rough frequency deviation. To detect a pattern in the preamble, the quadrature signals are examined for similarities by an amplitude comparison or in a cross-correlation process.
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申请公布号 |
US5305347(A) |
申请公布日期 |
1994.04.19 |
申请号 |
US19910855683 |
申请日期 |
1991.09.03 |
申请人 |
DEUTSCHE AEROSPACE AG |
发明人 |
ROSCHMANN, HANSJOERG;THEISGES, WALTER;ZOBERBIER, MANFRED;BRAKEMEIER, ACHIM;LINDNER, JUERGEN;ESPRESTER, RALF |
分类号 |
H04B7/01;(IPC1-7):H04L27/30;H04B17/00 |
主分类号 |
H04B7/01 |
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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