Systems and methods for a multicarrier modulation system with a variable margin
View Patent ↗A multicarrier modem has a plurality of carriers over which data is transmitted. By assigning, foe example, one or more different margins to the individual carriers the data rate and impairment immunity can be increased.
1. A multicarrier modulation communication system comprising:
a plurality of subchannels;
a plurality of margins;
a receiver operable to receive a multicarrier symbol comprising a first plurality of carriers and a second plurality of carriers;
the receiver further operable to receive a first plurality of bits on the first plurality of carriers using a first Signal to Noise Ratio (SNR) margin value and transmitting a second plurality of bits on the second plurality of carriers using a second SNR margin value; and
the receiver further operable to change the first SNR margin value or the second SNR margin value after commencing data communications;
wherein the first plurality of carries is different than the second plurality of carriers,
wherein the first SNR margin value is different than the second SNR margin value,
wherein the first SNR margin value provides more robust transmission than the second SNR margin value,
wherein the first SNR value is associated with an increase in noise on the first plurality of carriers, and
wherein the second SNR margin value associated with an increase in noise on the second plurality of carriers.
2. A multicarrier communications transceiver comprising:
a receiver operable to receive a multicarrier symbol comprising a first plurality of carriers and a second plurality of carriers;
the receiver further operable to receive a first plurality of bits on the first plurality of carriers using a first Signal to Noise Ratio (SNR) margin value and transmitting a second plurality of bits on the second plurality of carriers using a second SNR margin value; and
the receiver further operable to change the first SNR margin value or the second SNR margin value after commencing data communications;
wherein the first plurality of carriers is different than the second plurality of carriers,
wherein the first SNR margin value is different than the second SNR margin value,
wherein the first SNR margin value provides more robust transmission than the second SNR margin value,
wherein the first SNR margin value is associated with an increase in noise on the first plurality of carriers, and
wherein the second SNR margin value associated with an increase in noise on the second plurality of carriers.
3. The transceiver of claim 2 , wherein changing the first SNR margin value or the second SNR margin value is based on a time of the day.
4. The transceiver of claim 2 , wherein changing the first SNR margin value or the second SNR margin value is based on an error rate.
5. The transceiver of claim 2 , wherein changing the first SNR margin value or the second SNR margin value is based on a service provider directive.
6. The transceiver of claim 2 , wherein changing the first SNR margin value or the second SNR margin value is based on a change in a quality of service requirement.
7. The transceiver of claim 2 , wherein the first SNR margin value or the second SNR margin value is based on a loop length.
8. The transceiver of claim 2 , wherein the first SNR margin value or the second SNR margin value is based on temperature variance information.
9. The transceiver of claim 2 , wherein the first SNR margin value or the second SNR margin value is based on impairments on the line.
10. The transceiver of claim 2 , wherein the first SNR margin value or the second SNR margin value is based on actual installation and historical data and/or statistical information relating to one or more carriers.
11. A multicarrier communications transceiver comprising:
a receiver operable to receive a multicarrier symbol comprising a first plurality of carriers and a second plurality of carriers; and
the receiver further operable to receive a first plurality of bits on the first plurality of carriers using a first SNR margin value and transmitting a second plurality of bits on the second plurality of carriers using a second SNR margin value;
wherein the first plurality of carriers is different than the second plurality of carriers,
wherein the first SNR margin value is different than the second SNR margin value,
wherein the first SNR margin value provides more robust transmission than the second SNR margin value,
wherein the first SNR margin value is associated with an increase in noise on the first plurality of carriers,
wherein the second SNR margin value associated with an increase in noise on the second plurality of carriers, and
the receiver further operable to receive a service provider directive to update the first SNR margin value or the second SNR margin value.
12. The transceiver of claim 11 , wherein updating the first SNR margin value or the second SNR margin value is based on a time of the day.
13. The transceiver of claim 11 , wherein updating the first SNR margin value the second SNR margin value is based on an error rate.
14. The transceiver of claim 11 , wherein updating the first SNR margin value or the second SNR margin value is based on a service provider directive.
15. The transceiver of claim 11 , wherein updating the first SNR margin value or the second SNR margin value is based on a change in a quality of service requirement.
16. The transceiver of claim 11 , wherein the first SNR margin value or the second SNR margin value is based on a loop length.
17. The transceiver of claim 11 , wherein the first SNR margin value or the second SNR margin value is based on temperature variance information.
18. The transceiver of claim 11 , wherein the first SNR margin value or the second SNR margin value is based on impairments on the line.
19. The transceiver of claim 11 , wherein the first SNR margin value or the second SNR margin value is based on actual installation and historical data and/or statistical information relating to one or more carriers.
20. A method in a multi carrier communications transceiver, the method comprising:
receiving a multicarrier symbol comprising a first plurality of carriers and a second plurality of carriers;
receiving a first plurality of bits on the first plurality of carriers using a first SNR margin value and transmitting a second plurality of bits on the second plurality of carriers using a second SNR margin value; and
changing the first SNR margin value or the second SNR margin value after commencing data communications;
wherein the first plurality of carriers is different than the second plurality of carriers,
wherein the first SNR margin value is different than the second SNR margin value,
wherein the first SNR margin value provides more robust transmission than the second SNR margin value,
wherein the first SNR margin value is associated with an increase in noise on the first plurality of carriers, and
wherein the second SNR margin value associated with an increase in noise on the second plurality of carriers.
21. The method of claim 20 , wherein changing the first SNR margin value or the second SNR margin value is based on a service provider directive.
22. The method of claim 20 , wherein changing the first SNR margin value or the second SNR margin value is based on a change in a quality of service requirement.
23. The method of claim 20 , wherein the first SNR margin value or the second SNR margin value is based on a loop length.
24. The method of claim 20 , wherein the first SNR margin value or the second SNR margin value is based on temperature variance information.
25. The method of claim 20 , wherein the first SNR margin value or the second SNR margin value is based on impairments on the line.