Automatic gain controlling method and system of time-domain synchronous orthogonal frequency-division duplex receiver |
Title： |
| Automatic gain controlling method and system of time-domain synchronous orthogonal frequency-division duplex receiver |
|
Application Number： |
200410003481 |
Application Date： |
2004/03/31 |
Announcement Date： |
2005/10/05 |
Pub. Date： |
|
Publication Number： |
1678044 |
Announcement Number： |
|
Grant Date： |
|
Granted Pub. Date： |
|
ApplicationType： |
Invention |
State/Country： |
11[China|beijing] |
IPC： |
H04N 5/52, H04J 11/00, H04N 7/015 |
Applicant(s)： |
Tsinghua Univ. |
Inventor(s)： |
Yang Zhixing, Yang Lin |
Key Words： |
Automatic gain, controlling, time-domain synchronous, orthogonal frequency-division duplex, receiver |
Abstract： |
Based on feature of TDS - OFDM signal frame, AGC control includes following steps: (1) completing frame synchronization at front end of receiver, determining separation of location between PN sequence and IDFT frame; (2) adopting time domain AGC circuit for PN sequence completes quick tracing for channel AGC; (3) DFT calculation converts IDFT frame into frequency domain, eliminating single frequency or narrow band interference through channel equalization to carry out AGC control in frequency domain; (4) weighted addition of time domain evaluation AGCPN and AGCIDFT obtains united AGC voltage, which is fed back to front end to carry put AGC amplitude control. 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： |
|
Priority： |
|
PCT： |
|
LegalStatus： |
|
Relevancy information
