Communication system and method with PAPR; and backoff configured for equilibrium

A communication system exhibiting robust communication links, said system comprising:

• a receiver having a front-end section and a demodulator section;
• and
• a transmitter configured to broadcast an amplified signal capable of being demodulated at said receiver, said transmitter comprising:
• a peak controller which controls a peak-to-average-power ratio (PAPR) parameter of a peak-reduced signal by adjusting an amount of peak-reduction noise combined with a modulated signal in said peak controller to form said peak-reduced signal;
• an amplifier section coupled to said peak controller and configured to apply amplification to said peak-reduced signal at a selectable input power backoff level and corresponding degree of linearity and to generate said amplified signal;
• a backoff controller coupled to said amplifier section, said backoff controller being configured to continuously adjust said input power backoff level of said amplifier section to maximize said amplification while maintaining a predetermined degree of amplifier linearity;
• an equilibrium estimator coupled to said peak controller, said equilibrium estimator being configured to provide an estimate of an equilibrium point at which a reduced a signal-to-noise ratio at said demodulator section of said receiver results from increasing a signal-to-noise ratio in said amplified signal broadcast from said transmitter, and a reduced signal-to-noise ratio at said demodulator section of said receiver also results from decreasing said signal-to-noise ratio in said amplified signal broadcast from said transmitter;
• and
• wherein said peak controller is configured to combine an amount of said peak-reduction noise with said modulated signal that causes said transmitter to operate at said estimated equilibrium point.

A method of operating a transmitter configured to broadcast a peak-reduced amplified signal capable of being demodulated at a receiver having a front-end section and a demodulator section, said method comprising:

• generating peak-reduction noise from a modulated signal;
• combining said peak-reduction noise with a delayed version of said modulated signal in a peak controller to form a peak-reduced signal which exhibits a lower peak-to-average-power ratio (PAPR) parameter than is exhibited by said modulated signal;
• applying amplification to said peak-reduced signal in an amplifier section which operates at a selectable input power backoff level and at a corresponding degree of amplifier linearity and which generates said amplified signal;
• continuously adjusting said input power backoff level of said amplifier section to maximize said amplification while maintaining a predetermined degree of amplifier linearity;
• and
• estimating an equilibrium point at which a reduced a signal-to-noise ratio at said demodulator section of said receiver results from increasing a signal-to-noise ratio in said amplified signal broadcast from said transmitter, and a reduced signal-to-noise ratio at said demodulator section of said receiver also results from decreasing said signal-to-noise ratio in said amplified signal broadcast from said transmitter;
• wherein said peak-reduction noise is combined with said modulated signal in an amount that causes said transmitter to operate at said estimated equilibrium point.