The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 21, 2002
Filed:
Jun. 29, 1999
Nobukazu Koizumi, Kawasaki, JP;
Seiji Miyoshi, Kawasaki, JP;
Takashi Sasaki, Kawasaki, JP;
Kazutomo Hasegawa, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A digital subscriber line communicating system and a transceiver therein are disclosed. The system or the transceiver comprises: a unit for calculating a bitmap which defines the number of transmissible bits for each carrier signal in each of periodical noise durations and a rate converter for converting a constant rate of an input transmitting data into a rate determined by the bitmap, and for adding, in a predetermined number of the periodical noise durations, dummy bits to the data having the converted rate. The bitmap calculating unit includes: a line quality measuring unit for measuring the quality of the communication line in each of the periodical noise durations, a transmission bit number converter for calculating the number of transmissible bits to be allocated to each carrier to form the bitmap, and a bitmap optimizing unit for minimizing the dummy bits by decreasing the number of the transmissible bits allocated to each carrier signal of the symbols. The decreasing is performed in the order from the number of bits allocated to a carrier with a smaller S/N margin to the number of bits allocated to a carrier with a larger S/N margin.