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1. WO2020002749 - AN ARRANGEMENT FOR CATV AMPLIFIER CONTROL

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

Claims:

1. A network element of a cable television (CATV) network, said network element comprising

one or more amplifier units for amplifying downstream signal transmission for digital output into one or more output channels;

means for obtaining modulation error ratio (MER) of all active digital output channels; and

means for reducing bias current of said one or more amplifier units from a predetermined value until the MER value reaches a predetermined minimum value.

2. The network element according to claim 1 , wherein said bias current of said one or more amplifier units is arranged to be reduced stepwise and the MER values are arranged to be obtained at each step.

3. The network element according to claim 1 or 2, wherein the predetermined minimum value of the MER corresponds to a maximum allowable value of MER.

4. The network element according to any preceding claim, further comprising

means for detecting the value of MER of said one or more active digital output channels.

5. The network element according to any preceding claim, further comprising

means for receiving a measured value of MER of said one or more active digital output channels from one or more cable modems connected to a network segment including said network element.

6. The network element according to claim 5, further comprising

means for implementing an algorithm to determine a control value, based on MER values from a plurality of cable modems, for adjusting the bias current.

7. The network element according to any preceding claim, further comprising

means for detecting bit error rate (BER) of all active digital output channels,

wherein said means for reducing the bias current of said one or more amplifier units is arranged to stop reducing the bias current if a maximum allowable value of BER is reached.

8. The network element according to any preceding claim, wherein the digital output channels are modulated according to Single-Carrier Quadrature Amplitude Modulation (SC-QAM) or Orthogonal Frequency-Division Multiplexing (OFDM).

9. The network element according to any preceding claim, wherein said amplifier units comprise one or more of the following: a mid-stage amplifier unit, a gain control amplifier unit, a slope control amplifier unit, an output hybrid amplifier unit.