Circuits and methods for reducing the amplitude of complex signals

A circuit for reducing amplitude of a first signal having first and second components, the circuit comprising:

• a peak detector for detecting whether a peak in the first component exceeds a predetermined threshold;
• a signal generator coupled to the peak detector for generating a second signal in response to the peak detector detecting that the peak in the first component exceeds the predetermined threshold;
• and
• an adder coupled to the signal generator for reducing amplitude of the peak in the first component, wherein reducing amplitude of the peak in the first component includes adding the second signal to the first component.

A method of crest factor reduction in a first signal, the method comprising:

• receiving first and second components of the first signal;
• delaying the first component;
• generating a second signal in response to detecting that a peak in the first component exceeds a first predetermined threshold;
• reducing amplitude of the peak in the first component in response to detecting that the peak in the first component exceeds the first predetermined threshold;
• delaying the second component;
• generating a third signal in response to detecting that a peak in the second component exceeds a second predetermined threshold;
• and
• reducing amplitude of the peak in the second component in response to detecting that the peak in the second component exceeds the second predetermined threshold;
• wherein reducing amplitude of the peak in the first component includes adding the second signal to the delayed first component;
• and
• wherein reducing amplitude of the peak in the second component includes adding the third signal to the delayed second component.

A circuit for crest factor reduction in a first signal having first and second components, the circuit comprising:

• circuitry for delaying the first and second components;
• a first peak detector for detecting whether a peak in the first component exceeds a first predetermined threshold;
• a first signal generator coupled to the first peak detector for generating a second signal in response to the first peak detector detecting that the peak in the first component exceeds the first predetermined threshold;
• a first adder coupled to the first signal generator for reducing amplitude of the peak in the first component, wherein reducing amplitude of the peak in the first component includes adding the second signal to the delayed first component;
• a second peak detector for detecting whether a peak in the second component exceeds a second predetermined threshold;
• a second signal generator coupled to the second peak detector for generating a third signal in response to the second peak detector detecting that the peak in the second component exceeds the second predetermined threshold;
• and
• a second adder coupled to the second signal generator for reducing amplitude of the peak in the second component, wherein reducing amplitude of the peak in the second component includes adding the third signal to the delayed second component.