Phase system rotation for power estimation

A receiver for receiving a digitally modulated signal in a communication system, comprising:

• a signal processing unit adapted for determining in-phase and quadrature-phase values of a phase constellation system relating to the received signal;
• and
• a calculation unit adapted for calculating at least one modified in-phase value and at least one modified quadrature-phase value relating to the phase constellation system rotated by a predetermined angle;
• wherein said signal processing unit is further adapted for determining absolute values of said in-phase and quadrature-phase values and said modified in-phase and quadrature-phase values, and identifying the maximum of said absolute values;
• wherein the receiver further comprises:
• a power estimation unit adapted for determining a power estimate of said received signal based on said identified maximum value.

An integrated circuit chip for processing a digitally modulated signal received in a communication system, comprising:

• a signal processing circuit adapted for determining in-phase and quadrature-phase values of a phase constellation system relating to the received signal;
• and
• a calculation circuit adapted for calculating at least one modified in-phase value and at least one modified quadrature-phase value relating to the phase constellation system rotated by a predetermined angle;
• wherein said signal processing circuit is further adapted for determining absolute values of said in-phase and quadrature-phase values and said modified in-phase and quadrature-phase values, and identifying the maximum of said absolute values;
• wherein the integrated circuit chip further comprises:
• a power estimation circuit for determining a power estimate of said received signal based on said identified maximum value.