Title:
【発明の名称】OFDMシステムとOFDM装置
Document Type and Number:
Japanese Patent JP2802254
Kind Code:
B2
Abstract:
In an OFDM broadcasting network system using a dispersive transmission method, transmission frequencies of transmission stations (non-reference transmission stations) are displaced from a transmission frequency (reference frequency) of another transmission station (reference transmission station) by DELTA f1 and DELTA f2 and then transmitted. In this case, even if frequency characteristics of a reception electric field at a given point within a service area have such a relationship as to cancel each other at some time point, the vectors of two non-reference incoming signals are rotated by 2 pi DELTA f1t and 2 pi DELTA f2t with respect to the vector of a reference incoming signal. Thus, such relationship of frequency cancellation does not last constantly. Therefore, there is no such an area within the service area, where reception is disabled constantly due to a multi-path distortion.
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Inventors:
Jiro Hirono
Masanori Saito
Uese Chiharu
Masanori Saito
Uese Chiharu
Application Number:
JP6480396A
Publication Date:
September 24, 1998
Filing Date:
March 21, 1996
Export Citation:
Assignee:
Next Generation Digital Television Broadcasting System Laboratory
Fuji Television Network Co., Ltd.
Fuji Television Network Co., Ltd.
International Classes:
H04H20/67; H04J11/00; H04L1/04; H04L27/18; H04L27/26; H04N5/00; H04N7/08; H04N7/081; (IPC1-7): H04J11/00; H04H3/00; H04L27/18; H04N5/00; H04N7/08; H04N7/081
Domestic Patent References:
| JP58194438A | ||||
| JP3230631A | ||||
| JP6338430U |
Other References:
【文献】特許86645(JP,C2)
Attorney, Agent or Firm:
Takehiko Suzue