Method and system for testing phase imbalance in QPSK receivers

Details Method and system for testing phase imbalance in QPSK receivers Method and system for testing phase imbalance in QPSK receivers

1996-05-30

1998-12-08

Chin, Stephen

Pulse or digital communications

Testing

Phase error or phase jitter

375365, 375210, 36472806, 342357, 342356, H04B 1700, H04B 1500, G06F 1715, G01S 502

Patent

active

058480994

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.

REFERENCES:
patent: 4430722 (1984-02-01), Massen et al.
patent: 4445118 (1984-04-01), Taylor et al.
patent: 5140617 (1992-08-01), Kubo
patent: 5151926 (1992-09-01), Chennakeshu et al.

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