CORRECTION OF AMPLITUDE AND PHASE IMBALANCE IN PSK RECEIVERS

摘要

The present invention balances the amplitude and phase of a received QPSK signal that may have been corrupted during transmission. The system determin es the amplitude of the I and Q symbols of a received signal, compares them, an d applies a correction to one or both channels to correct for amplitude imbalance. For phase imbalance, the system calculates the cross-correlation of the I and Q symbols which should average to zero. A correction factor is derived from the cross-correlation and applied to both channels, returning t he phase cross-correlation to zero. The output from the system is a signal corrected in both amplitude and phase.