Frame synchronous circuit and method for eliminating time frequency deviation effect of orthogonal FDM |
Title： |
| Frame synchronous circuit and method for eliminating time frequency deviation effect of orthogonal FDM |
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Application Number： |
200410003498 |
Application Date： |
2004/04/02 |
Announcement Date： |
2005/01/12 |
Pub. Date： |
2007/07/18 |
Publication Number： |
1564492 |
Announcement Number： |
1327642 |
Grant Date： |
2007-7-18 |
Granted Pub. Date： |
2007-7-18 |
ApplicationType： |
Invention |
State/Country： |
11[China|beijing] |
IPC： |
H04J 11/00, H04L 7/00 |
Applicant(s)： |
Tsinghua Univ. |
Inventor(s)： |
Kuang Linling, Lu Jianhua, Ni Zuyao |
Key Words： |
Frame synchronous circuit, method, eliminate, time frequency deviation effect, orthogonal FDM |
Abstract： |
The circuit includes local reference conjugate sequencer, delayed conjugate correlator, selecting merger unit. Local reference conjugate sequencer stores conjugate values of local reference sequence samples in different time delays. Multiplication is carried out between the said conjugate values and OFDM data sequence received respectively. Delayed conjugate correlator delays the multiplied result. After taking conjugate operated result of previous step, Multiplication is carried out between the multiplied result and the delayed multiplied result. The result of multiplication in twice is accumulated and square summation is carried out. Selective merger is carried out for output values of multiple delayed conjugate correlators. Peak detection is carried out in order to select maximum. The position of the peas value is synchronous position. Before frequency synchronism and symbol synchronization, the circuit can find position of OFDM frame precisely without inference from frequency deviation and sampling clock. |
Claim： |
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Priority： |
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PCT： |
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LegalStatus： |
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