Full duplex expander in a full duplex network

1. A method for full duplex communication including simultaneous transmission of upstream and downstream signals in a same frequency band at a position in a network following a full duplex (FDX) DOCSIS node in a downstream direction, the method comprising:

receiving at the position following the FDX node in the downstream direction, by a computing device, a downstream analog signal from the FDX node and an upstream analog signal in the same frequency band;

separating, by the computing device, the downstream analog signal and the upstream signal into a first path and a second path;

amplifying, by the computing device, the separated downstream analog signal using the first path and the separated upstream analog signal using the second path;

isolating, by the computing device, the amplified downstream analog signal and the amplified upstream analog signal from one another, wherein isolating the downstream signal and the upstream signal comprises canceling crosstalk from either the downstream signal or the upstream signal;

sending, by the computing device, the amplified downstream analog signal downstream towards a subscriber device; and

sending, by the computing device, the amplified upstream analog signal towards a full duplex node.

2. The method of claim 1 , wherein the downstream signal and the upstream signal are received during a same time slot.

3. The method of claim 2 , wherein the subscriber device is in a receive mode and another subscriber device that sent the upstream signal is in a transmit mode in the same time slot.

4. The method of claim 1 , wherein the downstream signal and the upstream signal are received in different time slots.

5. The method of claim 4 , wherein the subscriber device is in a receive mode in a first time slot in the different time slots and another subscriber device that sent the upstream signal is in a transmit mode in a second time slot in the different time slots.

6. The method of claim 1 , wherein isolating the downstream signal and the upstream signal comprises:

converting the separated downstream signal or the separated upstream signal from analog to digital; and

converting the separated downstream signal or the separated upstream signal from digital to analog.

7. The method of claim 6 , wherein amplifying the separated downstream signal or the separated upstream signal comprises performing one or more of amplifying the separated downstream signal or the separated upstream signal before converting the separated downstream signal or the separated upstream signal from analog to digital and amplifying the separated downstream signal or the separated upstream signal after converting the separated downstream signal or the separated upstream signal from digital to analog.

8. The method of claim 6 , wherein converting the separated downstream signal or the separated upstream signal from analog to digital and from digital to analog isolates a receiver side that receives the separated downstream signal or the separated upstream signal and a transmitter side that transmits the separated downstream signal or the separated upstream signal.

9. The method of claim 6 , further comprising:

decoding the separated downstream signal or the separated upstream signal after converting the separated downstream signal or the separated upstream signal from analog to digital; and

reconstructing the separated downstream signal or the separated upstream signal after decoding.

10. The method of claim 6 , wherein isolating the separated downstream signal and the separated upstream signal comprises canceling crosstalk from either the separated downstream signal and the separated upstream signal after converting the separated downstream signal or the separated upstream signal from analog to digital.

11. The method of claim 6 , wherein isolating the separated downstream signal and the separated upstream signal comprises canceling crosstalk from either the separated downstream signal and the separated upstream signal before converting the separated downstream signal or the separated upstream signal from analog to digital.

12. The method of claim 1 , wherein amplifying the separated downstream signal using the first path and the separated upstream signal using the second path comprises:

coupling the separated downstream signal to a first amplifier to amplify the separated downstream signal during a first time slot; and

coupling the separated upstream signal to a second amplifier to amplify the separated upstream signal during a second time slot.

13. The method of claim 1 , wherein amplifying the separated downstream signal using the first path and the separated upstream signal using the second path comprises:

coupling the separated downstream signal to an amplifier to amplify the separated downstream signal during a first time slot; and

coupling the separated upstream signal to the amplifier to amplify the separated upstream signal during a second time slot.

14. An apparatus comprising:

one or more directional couplers configured to receive a downstream analog signal and an upstream analog signal in a same frequency band and couple the downstream signal in a first path and couple the upstream signal in a second path;

one or more amplifiers configured to amplify the analog downstream signal using the first path and the upstream analog signal using the second path; and

one or more processors configured to isolate the downstream signal and the upstream signal from one another by cancelling crosstalk between the downstream signal and the upstream signal,

wherein the one or more directional couplers are configured to send the amplified downstream analog signal downstream towards a subscriber device and send the amplified upstream analog signal towards a full duplex node.

15. The apparatus of claim 14 , further comprising:

a first analog to digital converter configured to convert the downstream signal or the upstream signal from analog to digital; and

a second analog to digital converter configured to convert the downstream signal or the upstream signal from digital to analog.

16. The apparatus of claim 15 , wherein the isolation logic is configured to cancel crosstalk from either the downstream signal and the upstream signal after the first analog to digital converter converts the downstream signal or the upstream signal from analog to digital.

17. The apparatus of claim 14 , further comprising:

a first amplifier to amplify the downstream signal during a first time slot; and

a second amplifier to amplify the upstream signal during a second time slot.

18. The apparatus of claim 14 , further comprising an amplifier to amplify the downstream signal during a first time slot and amplify the upstream signal during a second time slot.

19. An apparatus comprising:

one or more computer processors; and

a non-transitory computer-readable storage medium comprising instructions, that when executed, control the one or more computer processors to be configured for:

receiving a downstream analog signal and an upstream analog signal in a same frequency band;

separating the downstream analog signal and the upstream analog signal into a first path and a second path;

amplifying the separated downstream analog signal using the first path and the separated upstream analog signal using the second path;

isolating the downstream analog signal and the upstream analog signal from one another by cancelling crosstalk between the downstream signal and the upstream signal;

sending the amplified downstream analog signal downstream towards a subscriber device; and

sending the amplified upstream analog signal towards a full duplex node.