Title:
【発明の名称】直交周波数分割多重化システム受信機の保護区間長検出装置及びその方法
Document Type and Number:
Japanese Patent JP3361798
Kind Code:
B2
Abstract:
An apparatus for detecting a guard interval length (type) of a transmission symbol among the structure of an orthogonal frequency division multiplexing (OFDM) system receiver, to ensure proper operation of a symbol start detector and a fast Fourier transform (FFT) window position controller, is provided. This apparatus includes an analog-to-digital converter (ADC) for converting a received OFDM signal into digital complex samples, a symbol start position detector for detecting a symbol start position with reference to information on a guard interval length among the complex samples output by the ADC, a symbol start position difference detector for detecting the difference between the symbol start position detected by the symbol start position detector and a symbol start position delayed for a predetermined symbol time, a guard interval length detector for comparing the symbol start position difference detected by the symbol start position difference detector with a predetermined guard interval decision reference value and detecting the length of the guard interval, and an FFT window position controller for shifting the FFT window position using the guard interval length detected by the guard interval length detector and the symbol start information detected by the symbol start detector, to activate an FFT at the shifted FFT window position. The lengths of various guard intervals are automatically detected in the OFDM receiver, thus performing accurate FFT window recovery.
Inventors:
Sun Hyun Do
Don Kyu Kim
Hyun Jin Choi
Don Kyu Kim
Hyun Jin Choi
Application Number:
JP2000514427A
Publication Date:
January 07, 2003
Filing Date:
September 28, 1998
Export Citation:
Assignee:
Samsung Electronics Company Limited
International Classes:
H04J1/05; H04J11/00; H04L27/26; H04N7/24; H04N21/2383; H04N21/438; (IPC1-7): H04J11/00
Domestic Patent References:
| JP10327122A | ||||
| JP10190610A | ||||
| JP8228188A | ||||
| JP10322304A |
Other References:
【文献】欧州特許出願公開772332(EP,A2)
Attorney, Agent or Firm:
Masatake Shiga (1 person outside)