Bidirectional communication system and upstream communication no

Details Bidirectional communication system and upstream communication no Bidirectional communication system and upstream communication no

1998-10-13

2000-10-10

Maung, Nay

Telecommunications

Transmitter and receiver at separate stations

Having measuring, testing, or monitoring of system or part

4552262, H04B 1700

Patent

active

06131014&

ABSTRACT:
To measure noise level of a signal for upstream communication during bidirectional communication and to maintain a constant quality for the upstream signal, it is provided a bidirectional communication system between a center unit and terminals comprising: a reference pattern signal generator for generating a reference pattern signal; a level controller for controlling the transmission level of the reference pattern signal; a transmitter for transmitting a plurality of the reference pattern signals having different transmission levels to the center unit; a receiver, provided in the center unit, for receiving the reference pattern signals; a level measurer for measuring the reception levels of the received reference pattern signals; and a noise level determiner for determining a noise level in the reception levels in accordance with the measured result obtained by the level measurer. The level controller changes the transmission level of the reference pattern signals step by step. The noise level determiner determines, as a noise level, a level which is one step lower than the lowest reception level measurable by the level measurer.

REFERENCES:
patent: 5450623 (1995-09-01), Yokoyama et al.
patent: 5613232 (1997-03-01), Toshida et al.
patent: 5721754 (1998-02-01), Chen
patent: 6011963 (2000-01-01), Ogoro

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