Space-time-frequency sensing of RF spectrum in cognitive radios

Details Space-time-frequency sensing of RF spectrum in cognitive radios Space-time-frequency sensing of RF spectrum in cognitive radios

2007-01-08

2009-10-27

Nguyen, Simon D (Department: 2618)

Telecommunications

Radiotelephone system

C455S067110, C455S101000, C455S450000, C455S509000, C370S330000

Reexamination Certificate

active

07610036

ABSTRACT:
A method detects unused frequency bands in a cognitive radio network. Multiple frequency bands for RF signals are sensed using an antenna array including a plurality of elements coupled to a receive RF chain, in which the plurality of elements are individually controllable. For each frequency band, multiple spatial directions are sensed for the RF signals using the antenna array. A particular frequency band and a particular direction and a particular time slot are assigned as an available frequency band, an available direction and a particular time slot for transmitting RF signals in a cognitive radio if the RF signals are not sensed in the particular spatial direction for the particular frequency band, and in which the RF signals are transmitted by a transmit chain connected to the antenna array.

REFERENCES:
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patent: 6847678 (2005-01-01), Berezdivin et al.
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patent: 2006/0039275 (2006-02-01), Walton et al.
patent: 2009/0060081 (2009-03-01), Zhang et al.
patent: 2009/0161610 (2009-06-01), Kang et al.

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