Method and apparatus for improving the signal-to-noise ratio of

Details Method and apparatus for improving the signal-to-noise ratio of Method and apparatus for improving the signal-to-noise ratio of

1997-11-24

1999-11-23

Chin, Stephen

Pulse or digital communications

Transceivers

Modems

375296, 375298, 375346, 455 63, H04B 138

Patent

active

059913371

ABSTRACT:
A method and apparatus for improving the signal-to-noise ratio of low-magnitude input signals that coincide with a noise band of channel noise introduced into the transmission of data across a communication channel. A transmitting and receiving modem establish a communication channel for facilitating the exchange of input signals. The receiving modem evaluates the noise spectrum of the communication channel on a dynamic basis at the commencement of the exchange of information. The transmitting modem suspends transmission while the receiving modem evaluates the noise band and magnitude of the noise information. The channel noise band and levels are transmitted from the receiving modem to the transmitting modem to generate pre-compensation modulation points that have an enhanced magnitude outside the channel noise. The enhanced low-magnitude input signal and all other signals are propagated across the communication channel and exposed to the channel noise. The signal-to-noise ratio of the low-magnitude signal is improved due to the magnitude enhancement of the susceptible signals prior to transmission.

REFERENCES:
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patent: 5048054 (1991-09-01), Eyuboglu
patent: 5202755 (1993-04-01), Yang et al.
patent: 5463661 (1995-10-01), Moran et al.
patent: 5790594 (1998-08-01), Peng
patent: 5802446 (1998-09-01), Giorgi et al.

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