Multilevel LINC Transmitter with Dynamic Out-Phasing Control

The patent implements a dynamic scale factor that varies with the input signal envelope A(t), transitioning from a fixed conventional approach to a time-varying adaptive approach. The scale factor is defined as r(t) = r0 * (A(t)/max(A)))^α where α controls the adaptation rate, allowing the out-phasing angle to dynamically optimize for different signal conditions while maintaining manageable system complexity through a controlled adaptation mechanism.

The patent changes the scale factor parameter from a constant fixed value to a variable parameter that depends on the input signal characteristics. By introducing the signal-dependent scale factor with adjustable exponent α, the system adapts the out-phasing angle to match the instantaneous envelope, thereby improving power efficiency and linearity without requiring complete system redesign.

The patent makes the out-phasing angle dynamic by linking it to the instantaneous signal envelope through the scale factor r(t). This allows the phase relationship between the two signal paths to adapt in real-time to maintaining optimal linearity across varying signal conditions, rather than relying on a fixed predetermined angle that cannot accommodate signal variations.

The system incorporates implicit feedback by using the input signal envelope A(t) to control the scale factor, which in turn controls the out-phasing angle. This closed-loop approach ensures that the phase relationship continuously adapts to the actual signal conditions, improving linearity through automatic adjustment rather than fixed manual configuration.

The patent transitions from a static ease-of-operation fixed scale factor to a dynamic adaptive scale factor that automatically adjusts to signal conditions. The dynamic scale factor r(t) = r0 * (A(t)/max(A)))^α maintains operational simplicity through automatic adaptation, eliminating the need for manual recalibration while significantly improving power efficiency by optimizing the out-phasing angle for each signal envelope level.

The system performs self-adjustment by using its own input signal envelope to control the scale factor. The LINC transmitter automatically optimizes its own operation by deriving the scale factor from the instantaneous signal characteristics, eliminating the need for external control or manual intervention while maximizing power efficiency across varying operating conditions.