Title:
モデム・データ・コンステレーションの設計
Document Type and Number:
Japanese Patent JP2006507724
Kind Code:
A
Abstract:
A method, system, and computer program product is disclosed for determining the optimal power of the downstream data signal transmitted by a digital server and designing a constellation based on this determination. Digital and analog loss is compensated for by calculating the constellation power, taking into consideration the client modem ADC'S dynamic range, the total loss across the network (both digital and analog losses), and the constrained maximum power of the digital network, so that the power of the transmitted signal at the input of the decoder's (client modem's) ADC is less than but as close as possible, and preferably equal to, the ADC'S maximum average power, PADC. The total loss LT across the entire network is determined from the handshake information exchanged during the modem start-up sequence. Using this information and the known dynamic range of the client modem's ADC, the power of the downstream data signal can be optimized.
More Like This:
Inventors:
You, Jingyo
Application Number:
JP2004550056A
Publication Date:
March 02, 2006
Filing Date:
October 20, 2003
Export Citation:
Assignee:
Agia Systems Incorporated
International Classes:
H04L27/36; H04L1/24; H04L5/14; H04M11/00
Attorney, Agent or Firm:
Masao Okabe
Nobuaki Kato
Kazuo
Okabe
Shinichi Usui
Takao Ochi
Teruhisa Motomiya
Asahi Shinmitsu
Katsumi Miyama
Nobuaki Kato
Kazuo
Okabe
Shinichi Usui
Takao Ochi
Teruhisa Motomiya
Asahi Shinmitsu
Katsumi Miyama