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

• US 8,937,988 B2
• Filed: 11/13/2013
• Issued: 01/20/2015
• 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:
  US14/079,285
• Publication Number:
  US 20140072062A1
• Time in Patent Office: 433 Days
• Field of Search: 375/222, 375/227, 375259-260, 375/285, 375/295, 375/316, 375/350, 370484-485
• 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, foe 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 for transmission, in a transceiver, a first plurality of bits onto a first carrier using a first Signal to Noise Ratio (SNR) margin;

modulating for transmission, in the transceiver, a second plurality of bits onto a second carrier using a second Signal to Noise Ratio (SNR) margin; and

modulating for transmission, in said transceiver, a third plurality of bits onto said first carrier using a third SNR margin,

wherein the first SNR margin specifies a first value for an allowable increase in noise without an increase in the bit error rate (BER) associated with the first carrier,

wherein the second SNR margin specifies a second value for an allowable increase in noise without an increase in the bit error rate (BER) associated with the second carrier,

wherein the third SNR margin specifies a third value for an allowable increase in noise without an increase in the bit error rate (BER) associated with said first carrier,

wherein the first SNR margin is different than the second SNR margin,

wherein the first SNR margin is different than the third SNR margin, and

wherein the first plurality of bits, the second plurality of bits and the third plurality of bits are each different from one another.

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

3. The method of claim 1, wherein at least one of the first, second and third SNR margins are further based on one or more of an expected change in temperature, an expected crosstalk from another transmission system, a change in length of a telephone wire, an expected radio frequency interference and an expected impulse noise.

4. A method of communications, comprising:

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

demodulating for reception, in the transceiver, a second plurality of bits from a second carrier using a second SNR margin; and

demodulating for reception, in the transceiver, a third plurality of bits from the first carrier using a third SNR margin,

wherein the first SNR margin specifies a first value for an allowable increase in noise without an increase in the bit error rate (BER) associated with the first carrier,

wherein the second SNR margin specifies a second value for an allowable increase in noise without an increase in the bit error rate (BER) associated with the second carrier,

wherein the third SNR margin specifies a third value for an allowable increase in noise without an increase in the bit error rate (BER) associated with said first carrier,

wherein the first SNR margin is different than the second SNR margin,

wherein the first SNR margin is different than the third SNR margin, and

wherein the first plurality of bits, the second plurality of bits and the third plurality of bits are each different from one another.

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

6. The method of claim 4, wherein at least one of the first, second and third SNR margins are further based on one or more of an expected change in temperature, an expected crosstalk from another transmission system, a change in length of a telephone wire, an expected radio frequency interference and an expected impulse noise.

7. An apparatus comprising:

a multicarrier communications transceiver operable to modulate for transmission a first plurality of bits onto a first carrier using a first Signal to Noise Ratio (SNR) margin and to modulate for transmission a second plurality of bits onto a second carrier using a second SNR margin, and to modulate for transmission a third plurality of bits onto the first carrier using a third SNR margin, wherein the first SNR margin specifies a first value for an allowable increase in noise without an increase in the bit error rate (BER) associated with the first carrier,

wherein the second SNR margin specifies a second value for an allowable increase in noise without an increase in the bit error rate (BER) associated with the second carrier,

wherein the third SNR margin specifies a third value for an allowable increase in noise without an increase in the bit error rate (BER) associated with said first carrier,

wherein the first SNR margin is different than the second SNR margin,

wherein the first SNR margin is different than the third SNR margin, and

wherein the first plurality of bits, the second plurality of bits and the third plurality of bits are each different from one another.

8. The apparatus of claim 7, wherein at least one of the first SNR margin, the second SNR margin and the third SNR margins are based at least on crosstalk or an expected crosstalk from another transmission system.

9. The apparatus of claim 7, wherein at least one of the first SNR margin, the second SNR margin and the third SNR margins are based at least on a change in temperature or an expected change in temperature.

10. The apparatus of claim 7, wherein at least one of the first SNR margin, the second SNR margin and the third SNR margins are based at least on impulse noise or expected impulse noise.

11. The apparatus of claim 7, wherein at least one of the first SNR margin, the second SNR margin and the third SNR margin is based at least on a length of a telephone line or a change in a length of a telephone line.

12. The apparatus of claim 7, wherein the apparatus is a linecard that is capable of transporting internet data.

13. The apparatus of claim 7, wherein the apparatus is a customer premises equipment that is capable of transporting internet data.

14. The apparatus of claim 7, wherein the transceiver includes at least one digital signal processor.

15. The apparatus of claim 7, wherein the transceiver includes at least one ASIC (Application-Specific Integrated circuit).

16. An apparatus comprising:

a multicarrier communications transceiver operable to demodulate for reception a first plurality of bits from a first carrier using a first Signal to Noise Ratio (SNR) margin and to demodulate for reception a second plurality of bits from a second carrier using a second SNR margin, and to demodulate for reception a third plurality of bits from the first carrier using a third SNR margin, wherein the first SNR margin specifies a first value for an allowable increase in noise without an increase in the bit error rate (BER) associated with the first carrier,

wherein the second SNR margin specifies a second value for an allowable increase in noise without an increase in the bit error rate (BER) associated with the second carrier,

wherein the third SNR margin specifies a third value for an allowable increase in noise without an increase in the bit error rate (BER) associated with said first carrier,

wherein the first SNR margin is different than the second SNR margin,

wherein the first SNR margin is different than the third SNR margin, and

wherein the first plurality of bits, the second plurality of bits and the third plurality of bits are each different from one another.

17. The apparatus of claim 16, wherein at least one of the first SNR margin, the second SNR margin and the third SNR margin is based at least on crosstalk or expected crosstalk from another transmission system.

18. The apparatus of claim 16, wherein at least one of the first SNR margin, the second SNR margin and the third SNR margin is based at least on a change in temperature or an expected change in temperature.

19. The apparatus of claim 16, wherein at least one of the first SNR margin, the second SNR margin and the third SNR margin is based at least on impulse noise or expected impulse noise.

20. The apparatus of claim 16, wherein at least one of the first SNR margin, the second SNR margin and the third SNR margin is based at least on a length of a telephone line or a change in the length of telephone wire.

21. The apparatus of claim 16, wherein the apparatus is a linecard that is capable of transporting internet data.

22. The apparatus of claim 16, wherein the apparatus is a customer premises equipment that is capable of transporting internet data.

23. The apparatus of claim 16, wherein the transceiver includes at least one digital signal processor.

24. The apparatus of claim 16, wherein the transceiver includes at least one ASIC (Application-Specific Integrated Circuit).