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Abstract

A method or system (10) includes test apparatus (14) for measuring the phase imbalance in a QPSK receiver (12). A signal generator (16) provides a test signal (18) to the receiver (12), which responsively generates I channel data (20) and Q channel data (22). The system includes an oversampler (26) for producing respective sets of oversampled I and Q channel data (24) and (25). A data processing system (28) cross-correlates the sets of I and Q channel data at each of a plurality of relative phase increments, and generates a plurality of cross-correlation energy values in response to said cross-correlation. The method or system determines the phase imbalance in response to at least a largest cross-correlation energy value of said plurality of cross-correlation energy values.

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