Modem line probing signal techniques

Details Modem line probing signal techniques Modem line probing signal techniques

1994-03-15

1996-05-07

Tse, Young T.

Pulse or digital communications

Transceivers

Modems

375227, 370 17, 379 6, H04B 138, H04L 516

Patent

active

055153984

ABSTRACT:
Techniques for generating a line probing signal. The probing signal is comprised of a plurality of different tones, where the tones have a predetermined phase relationship. The signal may be sent over a communication channel, such as a telephone line. By so using the line probing signal, the non-linearity of the electrical characteristics of the telephone line may be measured with increased accuracy.

REFERENCES:
patent: 5048054 (1991-09-01), Eyuboglu et al.
patent: 5048056 (1991-09-01), Goldstein
patent: 5054034 (1991-10-01), Hughes-Hartogs
patent: 5214637 (1993-05-01), Sridhar et al.
patent: 5265151 (1993-11-01), Goldstein
patent: 5291520 (1994-03-01), Cole
On Minimizing the Peak-to-Average Power Ratio for the Sum of N Sinusoids, by D. R. Gimlin, Senior Member, IEEE, and C. R. Patisaul, Member, IEEE Transactions Communications, vol. 41, No. 4, Apr. 1993.
Excerpt, Modem Handbook for the Communications Professional, Cass Lewart (Elsevier), pp. 258-261 (Copyright 1987).

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