Method and apparatus for controlling a peak envelope power of a power amplifier

• US 5,854,571 A
• Filed: 10/28/1993
• Issued: 12/29/1998
• Est. Priority Date: 10/28/1993
• Status: Expired due to Term

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Laird, Kevin Michayl, Pinckley, Danny Thomas, Lynk, Charles N. Jr.
• Primary Examiner(s): MOTTOLA, STEVEN J
• Application Number:
  US08/144,931
• Time in Patent Office: 1,888 Days
• Field of Search: 330/107, 330/124 R, 330/129, 330/132, 455/103, 455/105, 455/115, 455/126
• US Class Current: 330/129
• CPC Class Codes: H03G 3/3042 in modulators, frequency-changers, transmitters or power amplifiers transmission power control in bidirectional transmission systems H04W52/04
• CPC Class Codes: H03G 3/3047 for intermittent signals, e.g. burst signals

Abstract

An apparatus and method of reducing a peak envelope power of a linear power amplifier (10) amplifying a plurality of channels is provided. The method includes the steps of measuring (104) the peak envelope power of the linear power amplifier, measuring a channel activity level (101) of each channel of the plurality of channels, and, when the peak envelope power exceeds a first threshold, changing (103, 106) at least one parameter of a channel of the plurality of channels having a channel activity level exceeding a second threshold to reduce the peak envelope power.

Claims

1. A method of reducing a peak envelope power of a linear power amplifier amplifying a plurality of carriers of a corresponding plurality of channels, such method comprising the steps of:

measuring the peak envelope power of a composite of at least two of the carriers;

measuring a channel activity level of one of the at least two carriers; and

, when the measured peak envelope power exceeds a first threshold, changing a parameter of one of the at least two carriers when the measured channel activity level exceeds a second threshold.

2. The method of claim 1 wherein the step of changing a parameter further comprises reducing a power level of a carrier of the channel.

3. The method of claim 1 wherein the step of changing a parameter further comprises changing a phase of a carrier of the channel.

4. An apparatus for reducing a peak envelope power of a linear power amplifier amplifying a plurality of carriers of a corresponding plurality of channels, such apparatus comprising:

means for measuring the peak envelope power of a composite of at least two of the carriers;

means for measuring a channel activity level of one of the at least two carriers; and

means for changing a parameter of one of the at least two carriers when the measured channel activity level exceeds a second threshold and when the peak envelope power exceeds a first threshold.

5. The apparatus of claim 4 wherein the means for changing a parameter further comprises means for reducing a power level of a carrier of the channel.

6. The apparatus of claim 4 wherein the means for changing a parameter further comprises means for changing a phase of a carrier of the channel.

7. A method of reducing a peak envelope power of a linear power amplifier amplifying a plurality of carriers of a corresponding plurality of channels, such method comprising the steps of:

measuring the peak envelope power of a composite of at least two of the carriers;

measuring a channel activity level of each of the at least two carriers; and

, when the peak envelope power exceeds a first threshold, changing a power level of a carrier having a channel activity level exceeding a second threshold to reduce the peak envelope power.

8. An apparatus for reducing a peak envelope power of a linear power amplifier amplifying a plurality of carriers of a corresponding plurality of channels, such apparatus comprising:

means for measuring the peak envelope power of a composite of at least two of the carriers;

means for measuring a channel activity level of each of the at least two carriers; and

means for changing a power level of a carrier having a channel activity level exceeding a second threshold when the peak envelope power exceeds a first threshold to reduce the peak envelope power.

9. A method of reducing a peak envelope power of a linear power amplifier amplifying a plurality of carriers of a corresponding plurality of channels, such method comprising the steps of:

measuring the peak envelope power of a composite of at least two of the carriers;

measuring a channel activity level of each of the at least two carriers; and

, when the peak envelope power exceeds a first threshold, changing a phase of a carrier having a channel activity level exceeding a second threshold to reduce the peak envelope power.

10. An apparatus for reducing a peak envelope power of a linear power amplifier amplifying a plurality of carriers of a corresponding plurality of channels, such apparatus comprising:

means for measuring the peak envelope power of a composite of at least two of the carriers;

means for measuring a channel activity level of each of the at least two carriers; and

means for changing a phase of a carrier having a channel activity level exceeding a second threshold when the peak envelope power exceeds a first threshold to reduce the peak envelope power.

11. An apparatus for reducing a peak envelope power of a linear power amplifier amplifying a plurality of carriers of a corresponding plurality of channels, such apparatus comprising:

a peak envelope power detector;

a channel activity level detector for measuring a channel activity level of each carrier of the plurality of carriers; and

a peak envelope power controller, coupled to the peak envelope power detector and the channel activity level detector, for changing a parameter of a carrier having a channel activity level exceeding a second threshold when the peak envelope power exceeds a first threshold to reduce the peak envelope power.