An in-service measurement system for the quality analysis of facsimile transmissions

The paper presents a measurement technique for the assessment of the degree of quality of facsimile transmissions over a telephone-type network that can be performed while the communication lines are in use. The main impairments introduced by the telecommunication channel are continuously measured by using a blind equalization technique and a timing recovery system, thus assuring a high accuracy with a reasonable measurement time, even under poor signal-to-noise ratio (SNR) conditions. Experimental results, that confirm the good performance of the proposed method, are reported and discussed.

[1]  Steven A. Tretter,et al.  Convergence properties of optimal adaptive carrier phase jitter predictors for sinusoidal jitter , 1995, IEEE Trans. Commun..

[2]  N. K. Jablon,et al.  Carrier recovery for blind equalization , 1989, International Conference on Acoustics, Speech, and Signal Processing,.

[3]  John G. Proakis,et al.  Digital Communications , 1983 .

[4]  S. Haykin,et al.  Adaptive Filter Theory , 1986 .

[5]  Athanasios Papoulis,et al.  Probability, Random Variables and Stochastic Processes , 1965 .

[6]  D. Godard,et al.  Self-Recovering Equalization and Carrier Tracking in Two-Dimensional Data Communication Systems , 1980, IEEE Trans. Commun..

[7]  Alan V. Oppenheim,et al.  Discrete-Time Signal Pro-cessing , 1989 .

[8]  Richard Schaphorst,et al.  Fax: Digital Facsimile Technology and Applications , 1992 .

[9]  John R. Treichler,et al.  Practical blind demodulators for high-order QAM signals , 1998 .

[10]  Michael G. Larimore,et al.  New processing techniques based on the constant modulus adaptive algorithm , 1985, IEEE Trans. Acoust. Speech Signal Process..

[11]  Richard D. Gitlin,et al.  Adaptive carrier recovery systems for digital data communications receivers , 1989, IEEE J. Sel. Areas Commun..

[12]  Neil K. Jablon,et al.  Joint blind equalization, carrier recovery and timing recovery for high-order QAM signal constellations , 1992, IEEE Trans. Signal Process..

[13]  A. Descloux,et al.  1982/83 End office connection study: Analog voice and voiceband data transmission performance characterization of the public switched network , 1984, AT&T Bell Laboratories Technical Journal.

[14]  Kamilo Feher,et al.  Telecommunications Measurements, Analysis, and Instrumentation , 1987 .