Signal quality measuring scheme

Details Signal quality measuring scheme Signal quality measuring scheme

1999-07-28

2000-09-05

Ghebretinsae, Temesghen

Pulse or digital communications

Testing

Phase error or phase jitter

455 671, 4552261, H04B 1700

Patent

active

061154172

ABSTRACT:
A phase region deciding unit decides the phase region in which the signal point falls and a counter unit counts the number of signal points in each phase region. A weighted average calculating unit calculates a weighted average using the previous weighted average and a result of counting in the counter unit. A likelihood calculating unit calculates likelihood of the weighted average of phase distribution calculated weighted average using the phase-distribution table stored in a phase-distribution table storing unit for each phase-distribution model, detects a maximum likelihood phase-distribution model, and outputs the signal quality corresponding to the detected phase-distribution model as the estimated signal quality.

REFERENCES:
patent: 4542514 (1985-09-01), Watanabe
patent: 5103461 (1992-04-01), Tymes
patent: 5793805 (1998-08-01), Nikides
Scholz, J.B., et al., "A Scheme for High Performance Real-Time BER Measurement", IEEE Transactions on Communications, vol. 40, No. 10, Oct. 1992, pp. 1574-1576.

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