Communication channel selecting circuit corresponding to...

Details Communication channel selecting circuit corresponding to... Communication channel selecting circuit corresponding to...

2005-07-19

2005-07-19

Nguyen, Chau (Department: 2667)

Multiplex communications

Communication over free space

Having a plurality of contiguous regions served by...

C455S464000, C370S337000

Reexamination Certificate

active

06920117

ABSTRACT:
A communication channel selecting circuit which can select and use a channel that does not disturb or interfere with another radio apparatus, avoiding a channel occupied by other similar radio apparatus nearby, is provided. The communication channel selecting circuit selects a communication channel in accordance with radio signal intensity, the selecting circuit transmitting and receiving radio signals in a plurality of channels. A radio unit outputs a signal indicating radio signal intensity of a radio signal received through an antenna in a receiving status and transmitting a radio signal to the antenna in a transmission status. A control circuit sets the radio unit to the receiving status even at a transmission timing. The communication channel selecting circuit further includes a timing control circuit which outputs a timing signal for each of the plurality of channels at the transmission timing, a register which stores a signal level outputted from the radio unit in the receiving status corresponding to the timing signal and a transmission receiving control circuit which compares the signal level stored in the register and selects one of the plurality of channels to transmit/receive.

REFERENCES:
patent: 5203012 (1993-04-01), Patsiokas et al.
patent: 5280471 (1994-01-01), Kondou et al.
patent: 6185423 (2001-02-01), Brown et al.
patent: 6487418 (2002-11-01), Magana et al.
patent: 6690941 (2004-02-01), Cannon et al.

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