Pulse or digital communications – Transceivers – Transmission interface between two stations or terminals
Patent
1997-06-30
2000-10-03
Chin, Stephen
Pulse or digital communications
Transceivers
Transmission interface between two stations or terminals
375222, 370480, H04B 138
Patent
active
061283355
ABSTRACT:
A high speed software modem is described which uses a selectable, desirable portion of the total available bandwidth of a transmission channel. In a preferred embodiment, the invention is implemented in a personal computer connected to an upstream transceiver through a channel supporting an Asymmetric Digital Subscriber Loop (ADSL) standard. The achievable target data rate of the modem is based on the capabilities of an analog front end (AFE) used in the modem, and a host processor within such personal computer. In particular, the modem AFE contains subband filtering which causes an upstream transceiver to use only a selected number of available sub-channels for downstream data transmission. The data rate of the modem is increased by upgrading the AFE or the host processor in order to increase the number of processable transmitted downstream sub-channels.
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Chen Steve
Liu Ming-Kang
Liu Young Way
Chin Stephen
Fan Chieh M.
Integrated Telecom Express
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