Method for processing signals I and Q are produced for a digital modulator circuit of cutting to process input signals I and Q originals before applying them to a digital modulator, and.The digital modulator circuit clipping

摘要

"Method to process signals I and Q are produced for a digital modulator circuit of cutting to process input signals I and Q originals before applying them to a digital modulator, and.The digital modulator circuit cut-off ".The amplitudes of signals produced by a digital modulator can be limited so that instead of processing the vector output of the digital modulator or its vector components.The processing is applied to the signals I and Q of the baseband prior to modulation. The signals I and Q are applied to an input of a clipping circuit.Predetermined limit values are also applied to another input of the circuit limiter. The limiter circuit rotates the vector r - Q in the direction of the vector limit.At the same time vector is rotated towards the limit vector I - Q rotations are performed using the algorithm CORDIC.After the revolutions have been completed, the vector r - Q rotated is aligned with the vector limit so the length of the original vector I - Q rotated can be compared with the original vector limit.If the vector IQ rotated is shorter than the vector limit, then the signals I, Q originals are output signals of the circuit for clipping.However, if the vector r - Q original rotated is longer than the limit vector, then the signals I, Q originals shall be rejected and replaced by the values of the vector rotated coordinated limit.