Filling method of protecting gap in orthogonal frequency division multiplexing modulation system |
Title： |
| Filling method of protecting gap in orthogonal frequency division multiplexing modulation system |
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Application Number： |
01124144 |
Application Date： |
2001/08/17 |
Announcement Date： |
2002/02/06 |
Pub. Date： |
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Publication Number： |
1334655 |
Announcement Number： |
1142644 |
Grant Date： |
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Granted Pub. Date： |
2004-3-17 |
ApplicationType： |
Invention |
State/Country： |
11[China|beijing] |
IPC： |
H04J 11/00, H04L 12/28, H04N 7/015 |
Applicant(s)： |
Qinghua Univ |
Inventor(s)： |
Yang Lin, Gong Ke, Yang Zhixing |
Key Words： |
Filling method, protect gap, orthogonal frequency division multiplexing, modulation system |
Abstract： |
The invention relates to information transmission, especially information communication in the Internet, digital television, data broadcast application etc. When the time delay exists in the transmission channel using orthogonal frequency division multiplexing modulation (OFDM), the PN serial instead of protecting interval (zero protecting interval) is utilized to realize the antimultipath method of transferring signal and time estimating method for the start and termination of transferring signal. Each signal frame provides pseudo random m PN serial; the convolution signal is composed of receiving signal and PN serial. The start and termination of PN serial is recognized by the receiving signal substracting the convolution signal. The PN serial is used in time recovering, carrier wave recovering, channel estimation, frame synchronization and substitution of the protecting interval in OFDM. |
Claim： |
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Priority： |
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PCT： |
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LegalStatus： |
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