Method and apparatus for determining transmit power levels for d

Details Method and apparatus for determining transmit power levels for d Method and apparatus for determining transmit power levels for d

1995-06-30

1998-12-01

Chin, Stephen

Pulse or digital communications

Transceivers

Modems

375224, H04B 138

Patent

active

058449400

ABSTRACT:
An apparatus and method for a data communications device such as a modem (100, 101) to determine transmit power levels for data transmission and reception, from a received probe signal. The various embodiments utilizing a processor (108) or a digital signal processor (106) receive a probe signal, transmitted at two different power levels, which also typically contains noise and other distortions. The various method and apparatus embodiments then determine average signal levels (501), average noise levels (503), and a set of signal to distortion ratios corresponding to combinations of symbol rates and carrier frequencies. Parameters such as the receive signal power (509), the harmonic content (507), the proportional noise (511), and a signal to distortion ratio threshold (513) are utilized to determine a transmit power level (515).

REFERENCES:
patent: 5048054 (1991-09-01), Eyuhoglu et al.
patent: 5515398 (1996-05-01), Walsh et al.

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