Title:
回り込みキャンセラ
Document Type and Number:
Japanese Patent JP4409639
Kind Code:
B2
Abstract:
In order to cancel interference component induced by coupling between transmitting antenna and receiving antenna in a broadcasting wave relay station of direct relay type in a single frequency network by BST-OFDM or DVB-T system, a canceller including a digital signal processing unit for deriving a replica signal corresponding to interference component by processing a signal derived from an input signal or an output signal of a broadcasting wave relay equipment, and a subtractor for generating a signal from which the interference component has been removed by subtracting the said replica signal, said signal having the interference component removed therefrom being supplied to the broadcasting wave relay equipment and the signal amplified thereby being transmitted by a transmitting antenna. Said digital signal processing unit includes a digital filter and a tap coefficient setting circuit for generating tap coefficients by estimating a transfer function of an interference wave transmission path by utilizing a fact that amplitudes of carriers of TMCC signal, AC signal and SP signal consisting of BPSK modulated wave, and CP signal contained in a BST-OFDM signal are constant.
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Inventors:
Kazuhiko Shibuya
Naohiko Iai
Koichiro Imamura
Naohiko Iai
Koichiro Imamura
Application Number:
JP16218998A
Publication Date:
February 03, 2010
Filing Date:
June 10, 1998
Export Citation:
Assignee:
Japan Broadcasting Corporation
International Classes:
H04B1/10; H04B1/12; H04B1/52; H04B1/56; H04B7/15; H04B7/155; H04J11/00; H04K3/00; H04L27/26
Domestic Patent References:
| JP2249321A | ||||
| JP10075226A | ||||
| JP6252699A |
Foreign References:
| WO1997015991A1 |
Attorney, Agent or Firm:
Kenji Sugimura
British tribute
Kosaku Sugimura
Hiroshi Tokunaga
Umemoto Masao
Juno Aoki
Shiro Fujitani
British tribute
Kosaku Sugimura
Hiroshi Tokunaga
Umemoto Masao
Juno Aoki
Shiro Fujitani