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

  • US 6,092,122 A
  • Filed: 06/30/1997
  • Issued: 07/18/2000
  • Est. Priority Date: 06/30/1997
  • Status: Expired due to Term
First Claim
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1. A high speed communications system for receiving transmitted data from a remote transceiver, which transceiver is capable of transmitting an analog signal using up to M separate subchannels within a bandwidth F through a channel to said system, said system being configured to operate within a personal computer system including a host processing device for executing user application programs, said system comprising:

  • a channel interface circuit for coupling to and receiving said analog signal from the channel; and

    a front end receiving circuit for sampling the analog signal and generating a digital signal based on such analog signal;

    a digital signal processing circuit for processing the digital signal, said digital signal processing circuit being implemented at least in part by signal processing software executed by the host processing device, the digital signal including data from a first frequency bandwidth portion f1 of said bandwidth F containing N separate subchannels, which N separate sub-channels are a subset of said M separate subchannels; and

    a bus interface circuit for transmitting said digital signal to the host processing device through a data bus associated with said personal computer system so that said signal processing software can also process such digital signal; and

    wherein the transmitted data is extracted based on an evaluation by the digital signal processing circuit of performance characteristics of said data carrying signals; and

    further wherein said system supports a maximum number of said N separate sub-channels, which maximum number is based on transmission characteristics of said channel, signal processing power of said host processing device, and loading conditions experienced by said host processing device.

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