Method of improving modem performance by controlling transmitted

Details Method of improving modem performance by controlling transmitted Method of improving modem performance by controlling transmitted

1991-07-26

1993-11-23

Ng, Jin F.

Telephonic communications

Telephone line or system combined with diverse electrical...

Having transmission of a digital message signal over a...

379 98, 375 58, H04M 1100

Patent

active

052651517

ABSTRACT:
Methods for improving modem performance and apparatus incorporating the methods are provided. The preferred methods comprise measuring the signal
oise ratio and intermodulation distortion (IMD) relating to signals being transmitted over a channel, and adjusting the transmitting power of the transmitting modem below a maximum permissable power in response to the measurements in order to reduce the error rate of the data transmission, the error rate being a function of both the signal
oise ratio and the IMD. Theoretically, the power can be adjusted to an optimal level, as the decrease in power increases the error rate due to signal
oise ratio according to a first function, but decreases the error rate due to IMD according to a second function. A first preferred manner of determining the final power level to be utilized is to calibrate a modem according to the techniques (e.g., Trellis precoding, etc.) it utilizes, and to utilize a look-up table for that modem to identify the desired power level based on the measured signal
oise ratio and the measured IMD. A second preferred manner is to decrease the signal power according to a formula which is a function of the third harmonic IMD.

REFERENCES:
patent: 4580262 (1986-04-01), Naylor et al.
patent: 4731816 (1988-03-01), Hughes-Hartogs
patent: 4768203 (1988-08-01), Ingle
patent: 5001776 (1991-03-01), Clark
patent: 5128965 (1992-07-01), Henriksson

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