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

• US 9,154,354 B2
• Filed: 01/07/2015
• Issued: 10/06/2015
• 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:
  US14/591,612
• Publication Number:
  US 20150117557A1
• Time in Patent Office: 272 Days
• Field of Search: 375/222, 375/227, 375259-260, 375/285, 375/295, 375/316, 375/350, 370484-485
• US Class Current: 1/1
• 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 method in a multicarrier communications transceiver comprising:

transmitting a multicarrier symbol comprising a first plurality of carriers and a second plurality of carriers;

transmitting a first plurality of bits on the first plurality of carriers using a first SNR margin;

transmitting a second plurality of bits on the 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 is different than the second SNR margin, and

wherein the first SNR margin provides more robust transmission than the second SNR margin.

2. The method of claim 1, wherein the first SNR margin specifies a first value for an increase in noise associated with the first plurality of carriers.

3. The method of claim 1, wherein the second SNR margin specifies a second value for an increase in noise associated with the second plurality of carriers.

4. A method in a multicarrier communications transceiver 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;

receiving a second plurality of bits on the 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 is different than the second SNR margin, and

wherein the first SNR margin provides more robust reception than the second SNR margin.

5. The method of claim 4, wherein the first SNR margin specifies a first value for an increase in noise associated with the first plurality of carriers.

6. The method of claim 4, wherein the second SNR margin specifies a second value for an increase in noise associated with the second plurality of carriers.

7. A multicarrier communications transceiver operable to:

transmit a multicarrier symbol comprising a first plurality of carriers and a second plurality of carriers;

transmit a first plurality of bits on the first plurality of carriers using a first SNR margin;

transmit a second plurality of bits on the 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 is different than the second SNR margin, and

wherein the first SNR margin provides more robust transmission than the second SNR margin.

8. The transceiver of claim 7, wherein the first SNR margin specifies a first value for an increase in noise associated with the first plurality of carriers.

9. The transceiver of claim 7, wherein the second SNR margin specifies a second value for an increase in noise associated with the second plurality of carriers.

10. A multicarrier communications transceiver operable to:

receive a multicarrier symbol comprising a first plurality of carriers and a second plurality of carriers;

receive a first plurality of bits on the first plurality of carriers using a first SNR margin;

receive a second plurality of bits on the 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 is different than the second SNR margin, and

wherein the first SNR margin provides more robust.

11. The transceiver of claim 10, wherein the first SNR margin specifies a first value for an increase in noise associated with the first plurality of carriers.

12. The transceiver of claim 10, wherein the second SNR margin specifies a second value for an increase in noise associated with the second plurality of carriers.