Correction of amplitude and phase imbalance in psk receivers

Details Correction of amplitude and phase imbalance in psk receivers Correction of amplitude and phase imbalance in psk receivers

H - Electricity

03

C

H03C 3/02 (2006.01) H03C 5/00 (2006.01) H04L 27/01 (2006.01) H04L 27/18 (2006.01)

Patent

CA 2505751

The present invention balances the amplitude and phase of a received QPSK signal that may have been corrupted during transmission. The system determines the amplitude of the I and Q symbols of a received signal, compares them, and 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 the phase cross-correlation to zero. The output from the system is a signal corrected in both amplitude and phase.

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