Wired communications systems with improved capacity and security
First Claim
1. A method comprising:
- transmitting data from a first device in a first direction over a cable in a cable communication network; and
transmitting data from a second device in a second direction opposite the first direction over the cable, wherein the data is transmitted in the first direction and in the second direction substantially simultaneously, using a division-free duplexing (DFD) technique comprising;
receiving an analog primary signal from the cable;
receiving an analog reference signal from a transmitter;
converting the analog primary signal into a digital primary signal;
converting the analog reference signal into a digital reference signal; and
processing the digital reference signal with a digital adaptive filter, wherein the digital adaptive fliter uses the digital reference signal and digital primary signal as inputs for determining filter tap weights of the digital adaptive to provide an output; and
subtracting the output of the digital adaptive filter from the digital primary signal to generate a digital cancelled signal.
1 Assignment
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Accused Products
Abstract
Provided are methods and systems of using division-free duplexing (DFD) in a cable communication network. Techniques for applying DFD in a cable communication network may enable data to be transmitted and received over a coaxial cable without using division duplexing techniques. For example, the cable communication network may include DFD enabled network nodes and each subscriber to the cable network may be equipped with a DFD system configured to operate in a DFD mode. In some embodiments, oppositely propagating signals may be transmitted over one frequency channel, and DFD techniques may be used to recover originally transmitted signals. Further, in some embodiments, DFD techniques may be used with encryption methods to increase the security of data transmitted in the cable communication network.
21 Citations
21 Claims
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1. A method comprising:
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transmitting data from a first device in a first direction over a cable in a cable communication network; and transmitting data from a second device in a second direction opposite the first direction over the cable, wherein the data is transmitted in the first direction and in the second direction substantially simultaneously, using a division-free duplexing (DFD) technique comprising; receiving an analog primary signal from the cable; receiving an analog reference signal from a transmitter; converting the analog primary signal into a digital primary signal; converting the analog reference signal into a digital reference signal; and processing the digital reference signal with a digital adaptive filter, wherein the digital adaptive fliter uses the digital reference signal and digital primary signal as inputs for determining filter tap weights of the digital adaptive to provide an output; and subtracting the output of the digital adaptive filter from the digital primary signal to generate a digital cancelled signal. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A cable communication system, comprising:
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a plurality of nodes each comprising a division-free duplexing (DFD) system configured such that each of the plurality of nodes is operable in a DFD mode; and a processor configured to control a mode of operation of each of the plurality of nodes. wherein the plurality of nodes each comprise instructions for; receiving a primary signal; receiving a reference signal from a transmitter; processing the reference signal with an adaptive filter, wherein the adaptive filter uses the reference signal and primary signal as inputs for determining filter tap weights of the adaptive filter to provide an output; and subtracting the output of the adaptive filter from the primary signal to generate a cancelled signal. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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15. A division-free duplexing (DFD) system comprising:
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a receiver capable of receiving an analog primary signal from a coaxial cable in a cable network; a transmitter capable of transmitting an analog transmitted signal to the coaxial cable; a directional coupler capable of sampling a portion of the analog transmitted signal to provide an analog reference signal; a first analog to digital converter capable of converting the analog primary signal into a digital primary signal; a second analog to digital converter capable of converting the analog reference signal into a digital reference signal; and a processor comprising instructions for; processing the digital reference signal with an adaptive filter, wherein the adaptive filter uses the digital reference and primary signals as inputs for determining filter tap weights of the adaptive filter to provide an output; and subtracting the output of the adaptive filter from the digital primary signal to generate a digital cancelled signal. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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Specification