| 摘要 |
<p>Apparatus and methods perform gain, clipping, and phase compensation in the presence of I/Q mismatch in quadrature RF receivers. Gain and phase mismatch are exacerbated by differences in clipping between I & Q signals in low resolution ADCs. Signals in the stronger channel arm are clipped differentially more than weaker signals in the other channel arm. Embodiments herein perform clipping operations during iterations of gain mismatch calculations in order to balance clipping between the I and Q channel arms (105 and 108, respectively). Gain compensation coefficients (120 and 122) are iteratively converged, clipping levels are established, and data flowing through the network (100) is gain and clipping compensated. A compensation phase angle and phase compensation coefficients (154 and 166) are then determined from gain and clipping compensated sample data. The resulting phase compensation coefficients are applied to the gain and clipping corrected receiver data (144 and 148) to yield a gain, clipping, and phase compensated data stream (on 170 and 172).</p> |
