SYSTEM AND METHOD FOR DYNAMIC OUTPUT BACK-OFF

• US 20110075772A1
• Filed: 09/29/2010
• Published: 03/31/2011
• Est. Priority Date: 09/30/2009
• Status: Active Grant

• Current Assignee: Hughes Network Systems LLC (Echostar Corporation)
• Original Assignee: Hughes Network Systems LLC (Echostar Corporation)
• Inventors: Estephan, Habib, Ricker, Doug, Sethi, Yogesh, Ozturk, Levent, Roos, Dave, Ragland, Roderick
• Granted Patent: US 8,553,801 B2
• Time in Patent Office: Days
• US Class Current: 375/345
• CPC Class Codes: H04L 27/0008 arrangements for allowing a transmitter or receiver to use more than one type of modulation negotiating modulation type for two-way transmission paths H04L5/1453
• CPC Class Codes: H04L 27/2067 with more than two phase states H04L27/2064 takes precedence
• CPC Class Codes: H04L 27/3411 reducing the peak to average power ratio or the mean power of the constellation; Arrangements for increasing the shape gain of a signal set

Abstract

A device is provided for use with an input signal including a first packet of a first modulation type in series with a second packet of a second modulation type. The device includes a gain adjustment portion and a gain portion. The gain adjustment portion can output a first gain adjustment signal based on the first packet or can output a second gain adjustment signal based on the second packet. The gain portion can output a first signal corresponding to the first packet and can output a second signal corresponding to the second packet. The first signal is based on the input signal and a first gain factor. The second signal is based on the input signal and a second gain factor. The first gain factor is based on the first gain adjustment signal. The second gain factor is based on the second gain adjustment signal.

Claims

1. A device comprising:

a gain adjustment portion operable to output one of a first gain adjustment signal based on a first packet of a first modulation type and a second gain adjustment signal based on a second packet of a second modulation type; and

a gain portion operable to output a first signal corresponding to the first packet and to output a second signal corresponding to the second packet, the first signal being based on an input signal and a first gain factor, the second signal based on the input signal and a second gain factor,

wherein the first gain factor is based on the first gain adjustment signal, and

wherein the second gain factor is based on the second gain adjustment signal.

2. The device of claim 1,

wherein the input signal includes an in-phase portion and a quadrature portion,

wherein said gain adjustment portion is operable to output the first gain adjustment signal as a first in-phase gain adjustment signal based on the first packet and a first quadrature gain adjustment signal based on the first packet,

wherein said gain adjustment portion is operable to output the second gain adjustment signal as a second in-phase gain adjustment signal based on the second packet and a second quadrature gain adjustment signal based on the second packet,

wherein said gain portion is operable to output the first signal as an in-phase signal corresponding to the first packet and a quadrature signal corresponding to the first packet,

wherein said gain portion is operable to output the second signal as an in-phase signal corresponding to the second packet and a quadrature signal corresponding to the second packet,

wherein the first gain factor includes a first in-phase gain factor and a first quadrature gain factor, the first in-phase gain factor being based on the first in-phase gain adjustment signal, the first quadrature gain factor being based on the first quadrature gain adjustment signal,

wherein the second gain factor includes a second in-phase gain factor and a second quadrature gain factor, the second in-phase gain factor being based on the second in-phase gain adjustment signal, the second quadrature gain factor being based on the second quadrature gain adjustment signal,

wherein the in-phase signal corresponding to the first packet is based on the in-phase portion and the first in-phase gain factor,

wherein the quadrature signal corresponding to the first packet is based on the quadrature portion and the first quadrature gain factor,

wherein the in-phase signal corresponding to the second packet is based on the in-phase portion and the second in-phase gain factor,

wherein the quadrature signal corresponding to the second packet is based on the quadrature portion and the second quadrature gain factor,

wherein the first in-phase gain factor is based on the first in-phase gain adjustment signal,

wherein the first quadrature gain factor is based on the first quadrature gain adjustment signal,

wherein the second in-phase gain factor is based on the second in-phase gain adjustment signal, and

wherein the second quadrature gain factor is based on the second quadrature gain adjustment signal.

3. The device of claim 2, wherein said gain portion is operable to output the in-phase signal corresponding to the first packet and to output the quadrature signal corresponding to the first packet such that the first gain factor is the same as the second gain factor.

4. The device of claim 3, wherein said gain portion is operable to output the in-phase signal corresponding to the second packet and to output the quadrature signal corresponding to the second packet such that the third gain factor is the same as the fourth gain factor.

5. The device of claim 4, further comprising:

a phase rotating portion operable to output a phase-rotated in-phase signal and a phase-rotated quadrature signal, the phase-rotated in-phase signal being based on the in-phase portion, the phase-rotated quadrature signal being based on the quadrature portion;

a phase compensating portion operable to output one of an adjusted in-phase signal and an adjusted quadrature signal, the adjusted in-phase signal being based on the phase-rotated in-phase signal, the adjusted quadrature signal being based on the phase-adjusted quadrature signal; and

a delay portion operable to output a delay signal to said gain adjustment portion based on the input signal,

wherein said gain adjustment portion is operable to output the first gain adjustment signal, the second gain adjustment signal, the third gain adjustment signal and the fourth gain adjustment signal based on the delay signal,

wherein said gain portion is operable to output the in-phase signal corresponding to the first packet based on the one of adjusted in-phase signal and phase-rotated in-phase signal,

wherein said gain portion is operable to output the in-phase signal corresponding to the second packet based on the one of adjusted in-phase signal and phase-rotated in-phase signal,

wherein said gain portion is operable to output the quadrature signal corresponding to the first packet based on the other of phase-rotated quadrature signal and adjusted quadrature portion, and

wherein said gain portion is operable to output the quadrature signal corresponding to the second packet based on the other of phase-rotated quadrature signal and adjusted quadrature portion.

6. The device of claim 2, wherein said gain portion is operable to output the in-phase signal corresponding to the second packet and to output the quadrature signal corresponding to the second packet such that the third gain factor is the same as the fourth gain factor.

7. The device of claim 6, further comprising:

a phase rotating portion operable to output a phase-rotated in-phase signal and a phase-rotated quadrature signal, the phase-rotated in-phase signal being based on the in-phase portion, the phase-rotated quadrature signal being based on the quadrature portion;

a phase compensating portion operable to output one of an adjusted in-phase signal and an adjusted quadrature signal, the adjusted in-phase signal being based on the phase-rotated in-phase signal, the adjusted quadrature signal being based on the phase-adjusted quadrature signal; and

a delay portion operable to output a delay signal to said gain adjustment portion based on the input signal,

wherein said gain adjustment portion is operable to output the first gain adjustment signal, the second gain adjustment signal, the third gain adjustment signal and the fourth gain adjustment signal based on the delay signal,

wherein said gain portion is operable to output the in-phase signal corresponding to the first packet based on the one of adjusted in-phase signal and phase-rotated in-phase signal,

wherein said gain portion is operable to output the in-phase signal corresponding to the second packet based on the one of adjusted in-phase signal and phase-rotated in-phase signal,

wherein said gain portion is operable to output the quadrature signal corresponding to the first packet based on the other of phase-rotated quadrature signal and adjusted quadrature portion, and

wherein said gain portion is operable to output the quadrature signal corresponding to the second packet based on the other of phase-rotated quadrature signal and adjusted quadrature portion.

8. A method of adjusting an input signal, said method comprising:

outputting, via a gain adjustment portion, one of a first gain adjustment signal based on a first packet of a first modulation type and a second gain adjustment signal based on a second packet of a second modulation type;

outputting, via a gain portion, a first signal corresponding to the first packet, the first signal being based on an input signal and a first gain factor; and

outputting, via the gain portion, a second signal corresponding to the second packet, the second signal based on the input signal and a second gain factor,

wherein the first gain factor is based on the first gain adjustment signal, and

wherein the second gain factor is based on the second gain adjustment signal.

9. The method of claim 8,

wherein the input signal includes an in-phase portion and a quadrature portion,

wherein said gain adjustment portion is operable to output the first gain adjustment signal as a first in-phase gain adjustment signal based on the first packet and a first quadrature gain adjustment signal based on the first packet,

wherein said gain adjustment portion is operable to output the second gain adjustment signal as a second in-phase gain adjustment signal based on the second packet and a second quadrature gain adjustment signal based on the second packet,

wherein said gain portion is operable to output the first signal as an in-phase signal corresponding to the first packet and a quadrature signal corresponding to the first packet,

wherein said gain portion is operable to output the second signal as an in-phase signal corresponding to the second packet and a quadrature signal corresponding to the second packet,

wherein the first gain factor includes a first in-phase gain factor and a first quadrature gain factor, the first in-phase gain factor being based on the first in-phase gain adjustment signal, the first quadrature gain factor being based on the first quadrature gain adjustment signal,

wherein the second gain factor includes a second in-phase gain factor and a second quadrature gain factor, the second in-phase gain factor being based on the second in-phase gain adjustment signal, the second quadrature gain factor being based on the second quadrature gain adjustment signal,

wherein the in-phase signal corresponding to the first packet is based on the in-phase portion and the first in-phase gain factor,

wherein the quadrature signal corresponding to the first packet is based on the quadrature portion and the first quadrature gain factor,

wherein the in-phase signal corresponding to the second packet is based on the in-phase portion and the second in-phase gain factor,

wherein the quadrature signal corresponding to the second packet is based on the quadrature portion and the second quadrature gain factor,

wherein the first in-phase gain factor is based on the first in-phase gain adjustment signal,

wherein the first quadrature gain factor is based on the first quadrature gain adjustment signal,

wherein the second in-phase gain factor is based on the second in-phase gain adjustment signal, and

wherein the second quadrature gain factor is based on the second quadrature gain adjustment signal.

10. The method of claim 9, wherein the first gain factor is the same as the second gain factor.

11. The method of claim 10, wherein the third gain factor is the same as the fourth gain factor.

12. The method of claim 11, further comprising:

outputting, via a phase rotating portion, a phase-rotated in-phase signal and a phase-rotated quadrature signal, the phase-rotated in-phase signal being based on the in-phase portion, the phase-rotated quadrature signal being based on the quadrature portion;

outputting, via a phase compensating portion, one of an adjusted in-phase signal and an adjusted quadrature signal, the adjusted in-phase signal being based on the phase-rotated in-phase signal, the adjusted quadrature signal being based on the phase-adjusted quadrature signal; and

outputting, via a delay portion, a delay signal to the gain adjustment portion based on the input signal,

wherein said outputting the first gain adjustment signal and the second gain adjustment signal comprises outputting the first gain adjustment signal and the second gain adjustment signal based on the delay signal,

wherein said outputting the third gain adjustment signal and the fourth gain adjustment signal comprises outputting the third gain adjustment signal and the fourth gain adjustment signal based on the delay signal,

wherein said outputting the in-phase signal comprises outputting the in-phase signal corresponding to the first packet based on one of the adjusted in-phase signal and the phase-rotated in-phase signal,

wherein said outputting the quadrature signal corresponding to the first packet comprises outputting the quadrature signal corresponding to the first packet based on the other of phase-rotated quadrature signal and adjusted quadrature portion,

wherein said outputting the in-phase signal corresponding to the second packet comprises outputting the in-phase signal corresponding to the second packet based on the one of adjusted in-phase signal and phase-rotated in-phase signal, and

wherein said outputting the quadrature signal corresponding to the second packet comprises outputting the quadrature signal corresponding to the second packet based on the other of phase-rotated quadrature signal and adjusted quadrature portion.

13. The method of claim 8, wherein the third gain factor is the same as the fourth gain factor.

14. The method of claim 13, further comprising:

outputting, via a phase rotating portion, a phase-rotated in-phase signal and a phase-rotated quadrature signal, the phase-rotated in-phase signal being based on the in-phase portion, the phase-rotated quadrature signal being based on the quadrature portion;

outputting, via a phase compensating portion, one of an adjusted in-phase signal and an adjusted quadrature signal, the adjusted in-phase signal being based on the phase-rotated in-phase signal, the adjusted quadrature signal being based on the phase-adjusted quadrature signal; and

outputting, via a delay portion, a delay signal to the gain adjustment portion based on the input signal,

wherein said outputting the first gain adjustment signal and the second gain adjustment signal comprises outputting the first gain adjustment signal and the second gain adjustment signal based on the delay signal,

wherein said outputting the third gain adjustment signal and the fourth gain adjustment signal comprises outputting the third gain adjustment signal and the fourth gain adjustment signal based on the delay signal,

wherein said outputting the in-phase signal corresponding to the first packet comprises outputting the in-phase signal corresponding to the first packet based on the one of adjusted in-phase signal and phase-rotated in-phase signal,

wherein said outputting the quadrature signal corresponding to the first packet comprises outputting the quadrature signal corresponding to the first packet based on the other of phase-rotated quadrature signal and adjusted quadrature portion,

wherein said outputting the in-phase signal corresponding to the second packet comprises outputting the in-phase signal corresponding to the second packet based on the one of adjusted in-phase signal and phase-rotated in-phase signal, and

wherein said outputting the quadrature signal corresponding to the second packet comprises outputting the quadrature signal corresponding to the second packet based on the other of phase-rotated quadrature signal and adjusted quadrature portion.

15. A computer-readable storage medium carrying one or more sequences of one or more instructions which, when executed by one or more processors, cause an apparatus to at least perform the following steps:

outputting, via a gain adjustment portion, one of a first gain adjustment signal based on a first packet of a first modulation type and a second gain adjustment signal based on a second packet of a second modulation type;

outputting, via a gain portion, a first signal corresponding to the first packet, the first signal being based on an input signal and a first gain factor; and

outputting, via the gain portion, a second signal corresponding to the second packet, the second signal based on the input signal and a second gain factor,

wherein the first gain factor is based on the first gain adjustment signal, and

wherein the second gain factor is based on the second gain adjustment signal.

16. The computer-readable media of claim 15,

wherein the input signal includes an in-phase portion and a quadrature portion,

wherein said gain adjustment portion is operable to output the first gain adjustment signal as a first in-phase gain adjustment signal based on the first packet and a first quadrature gain adjustment signal based on the first packet,

wherein said gain adjustment portion is operable to output the second gain adjustment signal as a second in-phase gain adjustment signal based on the second packet and a second quadrature gain adjustment signal based on the second packet,

wherein said gain portion is operable to output the first signal as an in-phase signal corresponding to the first packet and a quadrature signal corresponding to the first packet,

wherein said gain portion is operable to output the second signal as an in-phase signal corresponding to the second packet and a quadrature signal corresponding to the second packet,

wherein the first gain factor includes a first in-phase gain factor and a first quadrature gain factor, the first in-phase gain factor being based on the first in-phase gain adjustment signal, the first quadrature gain factor being based on the first quadrature gain adjustment signal,

wherein the second gain factor includes a second in-phase gain factor and a second quadrature gain factor, the second in-phase gain factor being based on the second in-phase gain adjustment signal, the second quadrature gain factor being based on the second quadrature gain adjustment signal,

wherein the in-phase signal corresponding to the first packet is based on the in-phase portion and the first in-phase gain factor,

wherein the quadrature signal corresponding to the first packet is based on the quadrature portion and the first quadrature gain factor,

wherein the in-phase signal corresponding to the second packet is based on the in-phase portion and the second in-phase gain factor,

wherein the quadrature signal corresponding to the second packet is based on the quadrature portion and the second quadrature gain factor,

wherein the first in-phase gain factor is based on the first in-phase gain adjustment signal,

wherein the first quadrature gain factor is based on the first quadrature gain adjustment signal,

wherein the second in-phase gain factor is based on the second in-phase gain adjustment signal, and

wherein the second quadrature gain factor is based on the second quadrature gain adjustment signal.

17. The computer-readable media of claim 16, wherein the first gain factor is the same as the second gain factor.

18. The computer-readable media of claim 17, wherein the third gain factor is the same as the fourth gain factor.

19. The computer-readable media of claim 18, wherein the apparatus is caused to further perform:

outputting, via a phase rotating portion, a phase-rotated in-phase signal and a phase-rotated quadrature signal, the phase-rotated in-phase signal being based on the in-phase portion, the phase-rotated quadrature signal being based on the quadrature portion;

outputting, via a phase compensating portion, one of an adjusted in-phase signal and an adjusted quadrature signal, the adjusted in-phase signal being based on the phase-rotated in-phase signal, the adjusted quadrature signal being based on the phase-adjusted quadrature signal; and

outputting, via a delay portion, a delay signal to the gain adjustment portion based on the input signal,

wherein said outputting the first gain adjustment signal and the second gain adjustment signal comprises outputting the first gain adjustment signal and the second gain adjustment signal based on the delay signal,

wherein said outputting the third gain adjustment signal and the fourth gain adjustment signal comprises outputting the third gain adjustment signal and the fourth gain adjustment signal based on the delay signal,

wherein said outputting the in-phase signal corresponding to the first packet comprises outputting the in-phase signal corresponding to the first packet based on one of the adjusted in-phase signal and the phase-rotated in-phase signal,

wherein said outputting the quadrature signal corresponding to the first packet comprises outputting the quadrature signal corresponding to the first packet based on the other of phase-rotated quadrature signal and adjusted quadrature portion,

wherein said outputting the in-phase signal corresponding to the second packet comprises outputting the in-phase signal corresponding to the second packet based on the one of adjusted in-phase signal and phase-rotated in-phase signal, and

wherein said outputting the quadrature signal corresponding to the second packet comprises outputting the quadrature signal corresponding to the second packet based on the other of phase-rotated quadrature signal and adjusted quadrature portion.

20. The computer-readable media of claim 16, wherein the third gain factor is the same as the fourth gain factor.