Method for eliminating interaction of pseudo-random series fill in OFDM modulation system |
Title： |
| Method for eliminating interaction of pseudo-random series fill in OFDM modulation system |
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Application Number： |
200510012127 |
Application Date： |
2005/07/08 |
Announcement Date： |
2007/01/10 |
Pub. Date： |
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Publication Number： |
1893409 |
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： |
H04L 27/26 |
Applicant(s)： |
Tsinghua Univ. |
Inventor(s)： |
Wang Jun, Wang Jintao, Pan Changyong, Song Jian, Yang Zhixing |
Key Words： |
OFDM modulation system, pseudo-random series fill, interaction, eliminating method |
Abstract： |
The invention is an iterative echo elimination method. The method includes steps: based on known pulse response of channel (PRCH) at previous two frames, using linear interpolation obtains PRCH at current and next frames; after synchronization of receiver, obtaining pseudo random sequence of current frame and next frame as well as result of convolution between the said pseudo random sequence and corresponding PRCH; removing the said convolution from signal in Ith frame, the receiver obtains convolution between data in Ith frame equivalent to zero filled system and PRCH; using method of time-domain filtering and decision directed feedback removes items of interference and noise between residue codes, and updates estimated value of channel in each frame till presetting iterations. Computer simulation indicates that raising efficiency of spectrum greatly without losing performance of error code. The invention is still valid if single frequency network with large time delay. |
Claim： |
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Priority： |
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PCT： |
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