xDSL DMT modem using sub-channel selection to achieve scaleable data rate based on available signal processing resources

摘要: A high speed modem is provided which uses a selectable, desirable portion of the total available bandwidth transmission channel. In preferred embodiment, invention incorporated in dedicated hardware circuit connected on one end to data processor and other an upstream transceiver through channel supporting Asymmetric Digital Subscriber Loop (ADSL) standard. The achievable target rate based capabilities analog front (AFE) used modem, signal within hardware. particular, AFE contains subband filtering causes use only selected number sub-channels for downstream transmission. increased by upgrading or order increase processable transmitted sub-channels.