Systems and methods for a multicarrier modulation system with a variable margin

• US 8,625,660 B2
• Filed: 02/11/2013
• Issued: 01/07/2014
• Est. Priority Date: 04/18/2000
• Status: Expired due to Fees

• Current Assignee: TQ Delta LLC (Techquity Capital Management, LLC)
• Original Assignee: TQ Delta LLC (Techquity Capital Management, LLC)
• Inventors: Tzannes, Marcos C.
• Primary Examiner(s): Tran, Khanh C
• Application Number:
  US13/764,529
• Publication Number:
  US 20130148708A1
• Time in Patent Office: 330 Days
• Field of Search: 375/222, 375/227, 375259-260, 375/285, 375/295, 375/316, 375/350
• US Class Current: 375/222
• CPC Class Codes: H04B 1/38 Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
• CPC Class Codes: H04L 27/2601 Multicarrier modulation systems
• CPC Class Codes: H04L 27/2627 Modulators
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0044 allocation of payload
• CPC Class Codes: H04L 5/0046 Determination of how many bits are transmitted on different sub-channels
• CPC Class Codes: H04L 5/006 Quality of the received signal, e.g. BER, SNR, water filling

Abstract

A multicarrier modem has a plurality of carriers over which data is transmitted. By assigning, for example, one or more different margins to the individual carriers the data rate and impairment immunity can be increased.

Claims

1. A multicarrier communications method, comprising:

modulating, in a transceiver, a first plurality of bits onto a first plurality of carriers using a first Signal to Noise Ratio (SNR) margin; and

modulating, in the transceiver, a second plurality of bits onto a second plurality of carriers using a second SNR margin,

wherein the first plurality of carriers is different than the second plurality of carriers,

wherein the first SNR margin specifies a first value for an increase in noise associated with the first plurality of subcarriers,

wherein the second SNR margin specifies a second value for an increase in noise associated with the second plurality of subcarriers, and

wherein the first value for the increase in noise is different than the second value for the increase in noise.

2. The method of claim 1, wherein at least one of the first SNR margin and second SNR margin is based on one or more of a change in temperature, a crosstalk from another transmission system, a length of a telephone wire and an impulse noise.

3. A method of communications, comprising:

demodulating, in a transceiver, a first plurality of bits from a first plurality of carriers using a first Signal to Noise Ratio (SNR) margin; and

demodulating, in the transceiver, a second plurality of bits from a second plurality of carriers using a second SNR margin,

wherein the first plurality of carriers is different than the second plurality of carriers,

wherein the first SNR margin specifies a first value for an increase in noise associated with first plurality of subcarriers,

wherein the second SNR margin specifies a second value for an increase in noise associated with the second plurality of subcarriers, and

wherein the first value for the increase in noise is different than the second value for the increase in noise.

4. The method of claim 3, wherein at least one of the first SNR margin and second SNR margin is based on one or more of a change in temperature, a crosstalk from another transmission system, a length of a telephone wire and an impulse noise.

5. An apparatus comprising:

a multicarrier communications transceiver operable to modulate a first plurality of bits onto a first plurality of carriers using a first Signal to Noise Ratio (SNR) margin and to modulate a second plurality of bits onto a second plurality of carriers using a second SNR margin, wherein the first plurality of carriers is different than the second plurality of carriers, wherein the first SNR margin specifies a first value for an increase in noise associated with the first plurality of subcarriers, wherein the second SNR margin specifies a second value for an increase in noise associated with the second plurality of subcarriers, and wherein the first value for the increase in noise is different than the second value for the increase in noise.

6. The apparatus of claim 5, wherein at least one of the first SNR margin and second SNR margin is based at least on crosstalk from another transmission system.

7. The apparatus of claim 5, wherein at least one of the first SNR margin and second SNR margin is based at least on crosstalk from a change in temperature.

8. The apparatus of claim 5, wherein at least one of the first SNR margin and second SNR margin is based at least on impulse noise.

9. The apparatus of claim 5, wherein at least one of the first SNR margin and second SNR margin is based at least on a length of a telephone line.

10. The apparatus of claim 5, wherein the apparatus is a linecard that is capable of transporting internet data.

11. The apparatus of claim 5, wherein the apparatus is a customer premises equipment that is capable of transporting internet data.

12. The apparatus of claim 5, wherein the transceiver includes at least one digital signal processor.

13. The apparatus of claim 5, wherein the transceiver includes at least one ASIC (application-specific integrated circuit).

14. A multicarrier communications transceiver operable to demodulate a first plurality of bits from a first plurality of carriers using a first Signal to Noise Ratio (SNR) margin and to demodulate a second plurality of bits from a second plurality of carriers using a second SNR margin, wherein the first plurality of carriers is different than the second plurality of carriers, wherein the first SNR margin specifies a first value for an increase in noise associated with the first plurality of subcarriers, wherein the second SNR margin specifies a second value for an increase in noise associated with the second plurality of subcarriers, and wherein the first value for the increase in noise is different than the second value for the increase in noise.

15. The transceiver of claim 14, wherein at least one of the first SNR margin and second SNR margin is based at least on crosstalk from another transmission system.

16. The transceiver of claim 14, wherein at least one of the first SNR margin and second SNR margin is based at least on crosstalk from a change in temperature.

17. The transceiver of claim 14, wherein at least one of the first SNR margin and second SNR margin is based at least on impulse noise.

18. The transceiver of claim 14, wherein at least one of the first SNR margin and second SNR margin is based at least on a length of a telephone line.

19. The apparatus of claim 14, wherein the apparatus is a linecard that is capable of transporting internet data.

20. The apparatus of claim 14, wherein the apparatus is a customer premises equipment that is capable of transporting internet data.

21. The apparatus of claim 14, wherein the transceiver includes at least one digital signal processor.

22. The apparatus of claim 14, wherein the transceiver includes at least one ASIC (application-specific integrated circuit).