Timed recoverting method fortime-domain synchronous orthogonal frequency-division duplex receiver and system thereof |
Title： |
| Timed recoverting method fortime-domain synchronous orthogonal frequency-division duplex receiver and system thereof |
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Application Number： |
200410003485 |
Application Date： |
2004/03/31 |
Announcement Date： |
2005/10/05 |
Pub. Date： |
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Publication Number： |
1677910 |
Announcement Number： |
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Grant Date： |
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Granted Pub. Date： |
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ApplicationType： |
Invention |
State/Country： |
11[China|beijing] |
IPC： |
H04J 11/00, H04N 7/015, H04L 7/00 |
Applicant(s)： |
Tsinghua Univ. |
Inventor(s)： |
Yang Zhixing, Yang Lin |
Key Words： |
Timed recoverting method,time-domain synchronous, orthogonal frequency-division duplex, receiver |
Abstract： |
First, received sampled data passes through interpolation filter in time domain. Extracting error signal is realized through delay lock loop obtained by using correlation of PN. Next, error signal is passed through low pass filter and accumulator in sequence. Then, output of the accumulator drives NCO in order to generate fraction delays and base points needed by the interpolation filter and decimator. Finally, after sampled points are interpolated, extracted data are controlled to be as synchronous data so as to complete close loop. The invention raises accuracy for estimating symbol timing, and keeps high timing accuracy under multipaths channels so as to recovery system synchronization correctly. The invention is realized at FPGA of Tsinghua DMB - T, ASIC version receiver. Favorable effect is obtained through actual try out broadcasting and testing, and performance is better than other system evidently. |
Claim： |
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Priority： |
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PCT： |
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LegalStatus： |
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