Structure of up-link/down-link signals for interactive diugital information transmission and synchronous access method |
Title： |
| Structure of up-link/down-link signals for interactive diugital information transmission and synchronous access method |
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Application Number： |
02129309 |
Application Date： |
2002/08/30 |
Announcement Date： |
2003/02/19 |
Pub. Date： |
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Publication Number： |
1398119 |
Announcement Number： |
1190051 |
Grant Date： |
2005-2-16 |
Granted Pub. Date： |
2005-2-16 |
ApplicationType： |
Invention |
State/Country： |
11[China|beijing] |
IPC： |
H04J 11/00, H04L 27/34, H04N 7/015 |
Applicant(s)： |
Tsinghua Univ |
Inventor(s)： |
Yang Lin, Yang Zhixing |
Key Words： |
up-link/down-link signals, interactive, diugital information transmission, synchronous access method |
Abstract： |
Interactive digit information transmission characterizes up/down stream signals are in the synchronous step structure. Down-stream signals modulated by TDS-OFDM in down-stream channel in which its frame is PN synchronous signals or mixed synchronous signal frame and in up-line channels, up-line signals modulated by multi-user by burst TDMA, in which its frame synchronous code is PN in 6 step m sequence. The up-line signal frame is made up of multi-user signals shared by multiple user composed of cut-in request and data signals, numbered according to the signal frame structure. The up-line channel cut-in is controlled by the down-stream channel after synchronization via random synchronous cut-in code. Up-link/down stream signals frame structures are synchronized with natural time to support bipolar transmission. |
Claim： |
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Priority： |
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PCT： |
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LegalStatus： |
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