Method and apparatus for adjusting pilot signal relative to input signal

A pilot signal system comprising:

• a main signal path configured to carry a signal to be amplified by an amplifier on said main signal path;
• a spitting device configured to receive said signal and provide said signal to said main signal path and a feed forward path;
• a pilot adjuster configured to respond to said power level of said signal on said main signal path by adjusting a power level of a pilot signal on a pilot injection path relative to said power level of said signal on said main signal path to produce a change in said power level of said pilot signal where the amount of said change depends on said power level of said signal on said main signal path;
• a combining device on said main signal path configured to inject an adjusted pilot signal from said pilot injection path onto said main signal path before said amplifier on said main signal path;
• said amplifier on said main signal path configured to amplify said signal and said adjusted pilot signal on said main signal path;
• a second splitting device on said main signal path configured to provide a portion of said amplified signal and said amplified pilot signal from said main signal path;
• a second combining device configured to combine said portion of said amplified signal and said amplified pilot signal and said signal on said feed forward path to produce a pilot signal on said feed forward path;
• and
• feed forward circuitry configured to inject said pilot signal on said feed forward path onto said main signal path.

A method of using a pilot signal, said method comprising the steps of:

• splitting a signal onto a main signal path and a feed forward path;
• adjusting a parameter of a pilot signal on a pilot injection path depending on a parameter of said signal on said main signal path;
• injecting said adjusted pilot signal onto said main signal path before an amplifier on said main signal path;
• amplifying said signal and said adjusted pilot signal on said main signal path;
• obtaining a portion of said amplified signal and said amplified pilot signal from said main signal path;
• combining said portion of said amplified signal and said amplified pilot signal with said signal on said feed forward path to produce a pilot signal on said feed forward path;
• and
• using said pilot signal on said feed forward path to reduce said amplified pilot signal on said main signal path.

A pilot signal system comprising:

• a spitting device configured to receive a signal and provide a signal to a main signal path and a feed forward path;
• said main signal path configured to carry a signal to be amplified by an amplifier on said main signal path;
• a pilot adjuster configured to respond to a parameter of said signal on said main signal path by adjusting a parameter of a pilot signal on a pilot injection path depending on said parameter of said signal;
• a first combining device on said main signal path configured to inject said adjusted pilot signal from said pilot injection path onto said main signal path;
• said amplifier on said main signal path after said first combining device configured to amplify said signal and said adjusted pilot signal on said main signal path;
• a second splitting device on said main signal path configured to provide a portion of said amplified signal and said amplified pilot signal from said main signal path;
• a second combining device configured to combine said portion of said amplified signal and said amplified pilot signal on said feed forward path to produce a pilot signal on said feed forward path;
• and
• a feed forward loop including said feed forward path configured to use said pilot signal on said feed forward path to reduce said amplified pilot signal on said main signal path.

A method of using a pilot signal, said method comprising the steps of:

• splitting a signal onto a main signal path and a feed forward path;
• adjusting a power level of a pilot signal on a pilot injection path relative to a power level of said signal on said main signal path;
• injecting said adjusted pilot signal onto said main signal path before an amplifier on said main signal path;
• amplifying said signal and said adjusted pilot signal on said main signal path;
• obtaining a portion of said amplified signal and said amplified pilot signal from said main signal path;
• combining said portion of said amplified signal and said amplified pilot signal with said signal on said feed forward path to produce a pilot signal on said feed forward path;
• and
• using said pilot signal on said feed forward path to reduce said amplified pilot signal on said main signal path.

A pilot signal system comprising:

• a spitting device configured to receive said signal and provide said signal to a main signal path and a feed forward path;
• said main signal path configured to carry a signal to be amplified by an amplifier on said main signal path;
• a pilot adjuster configured to respond to said power level of said signal on said main signal path by adjusting a power level of a pilot signal on a pilot injection path relative to said power level of said signal;
• a first combining device on said main signal path configured to inject said adjusted pilot signal onto said main signal path from said pilot injection path before said amplifier on said main signal path;
• said amplifier on said main signal path configured to amplify said signal and said adjusted pilot signal on said main signal path;
• a second splitting device on said main signal path configured to provide a portion of said amplified signal and said amplified pilot signal from said main signal path;
• a second combining device configured to combine said portion of said amplified signal and said amplified pilot signal and said signal on said feed forward path to produce a pilot signal on said feed forward path;
• and
• a feed forward loop including said feed forward path configured to use said pilot signal on said feed forward path to reduce said amplified pilot signal on said main signal path.