Title:
受信装置
Document Type and Number:
Japanese Patent JP3588462
Kind Code:
B2
Abstract:
At the transmitter side, carrier waves are modulated according to an input signal for producing relevant signal points in a signal space diagram. The input signal is divided into, two, first and second, data streams. The signal points are divided into signal point groups to which data of the first data stream are assigned. Also, data of the second data stream are assigned to the signal points of each signal point group. A difference in the transmission error rate between first and second data streams is developed by shifting the signal points to other positions in the space diagram expressed at least in the polar coordinate system. At the receiver side, the first and/or second data streams can be reconstructed from a received signal. In TV broadcast service, a TV signal is divided by a transmitter into, low and high, frequency band components which are designated as a first and a second data streams respectively. Upon receiving the TV signal, a receiver can reproduce only the low frequency band component or both the low and high frequency band components, depending on its capability. Furthermore, a communication system based on an OFDM system is utilized for data transmission of a plurality of subchannels, wherein the subchannels are differentiated by changing the length of a guard time slot or a carrier wave interval of a symbol transmission time slot, or changing the transmission electric power of the carrier.
Inventors:
Mitsuaki Oshima
Application Number:
JP2003160622A
Publication Date:
November 10, 2004
Filing Date:
June 05, 2003
Export Citation:
Assignee:
Matsushita Electric Industrial Co., Ltd
International Classes:
H03M13/25; H03M13/35; H04B1/66; H04B14/04; H04H20/00; H04H20/06; H04J11/00; H04L1/00; H04L27/00; H04L27/02; H04L27/04; H04L27/18; H04L27/22; H04L27/26; H04L27/34; H04L27/36; H04L27/38; H04N5/38; H04N5/40; H04N5/44; H04N5/455; H04N5/46; H04N7/00; H04N7/015; H04N7/08; H04N7/081; H04N7/20; H04N11/24; H04N21/2662; H04N21/647; H04N21/845; (IPC1-7): H04J11/00; H04L27/22; H04L27/38; H04N7/20
Domestic Patent References:
| JP2154583A | ||||
| JP5218978A | ||||
| JP3231036B2 |
Other References:
森山繁樹、斉藤正典、山田宰,都市部におけるVHF・UHF帯遅延伝搬特性,1991年電子情報通信学会春季全国大会講演論文集,日本,社団法人電子情報通信学会,1991年 3月15日,分冊2,p.406
伊藤泰宏、濱住啓之、宮沢寛,地上デジタル放送用AW-CDM伝送方式,テレビジョン学会技術報告,日本,社団法人テレビジョン学会,1993年 2月25日,Vol.17 No.13,pp.27-32
伊藤泰宏、濱住啓之、宮沢寛,地上デジタル放送用AW-CDM伝送方式,テレビジョン学会技術報告,日本,社団法人テレビジョン学会,1993年 2月25日,Vol.17 No.13,pp.27-32
Attorney, Agent or Firm:
Aoyama Aoi
Osamu Kawamiya
Osamu Kawamiya