Patent ID: 6879642
Filing Date: 2005-04-12
Classification: H04L

Abstract:
1. A method of processing I and Q signals produced for a digital modulator, the signals being treated as the orthogonal vector components of an original I-Q vector on a rectangular coordinate plane comprising the Q axis and the I axis, comprising the steps of: specifying two limit values determining a limit vector originating from the origin and ending at the limit values; rotating the original I-Q vector by using Cordic rotation algorithm stepwise in a number of steps towards the limit vector until the rotated original vector is approximately aligned with the limit vector; rotating the limit vector by using Cordic rotation algorithm stepwise in the same number of steps towards the original I-Q vector; comparing the length of the rotated original I-Q vector to the length of the limit vector; applying the original I and Q signals to the digital modulator if the rotated original vector is shorter than the limit vector, and applying the I and Q coordinate values of the rotated limit vector to the digital modulator if the rotated original vector is longer than the limit vector.