Line probing modem

Details Line probing modem Line probing modem

1989-05-12

1991-09-10

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 10, 375 38, 375100, 455135, 455 62, H04B 710

Patent

active

050480545

ABSTRACT:
A modem for receiving data sent from a remote device over a communication channel by using a single carrier modulated signal, the modem including a receiver for receiving the modulated signal and for receiving a line probing signal sent by the remote device over the channel, the receiver being capable of receiving the modulated signal over any one of a plurality of frequency bands; a line probing processor for measuring characteristics of the channel based upon the received line probing signal; and a selector for selecting one of the plurality of frequency bands, said selection being based upon the measured characteristics of the channel, said selected frequency band to be used for receiving the modulated signal from the remote device.

REFERENCES:
patent: 4309773 (1982-01-01), Johnson et al.
patent: 4630126 (1986-12-01), Kaku et al.
patent: 4679227 (1987-07-01), Hughes-Hartogs
patent: 4756007 (1988-07-01), Qureshi et al.
Eyuboglu, "Detection of Severely Distorted Signals Using Decision Feedback Noise Prediction with Interleaving," IEEE Transaction of Communications, vol. 36, No. 4, Apr. 1988, pp. 401-409.
USSN 351,186, "Trellis Precoding for Modulation Systems".
Kalet, "The Multitone Channel," IEEE Transactions on Communications, vol. 37, No. 2, Feb. 1989, pp. 119-124.

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