Space-time-frequency sensing of RF spectrum in cognitive radios
First Claim
1. A method for detecting unused frequency bands in a cognitive radio network, comprising the steps of:
- sensing a plurality of frequency bands for RF signals using an antenna array including a plurality of elements coupled to a receive RF chain, in which the plurality of elements are individually controllable;
sensing, for each frequency band, a plurality of spatial directions for the RF signals using the antenna array including the plurality elements coupled to the receive RF chain; and
assigning a particular frequency band and a particular direction as an available frequency band and an available direction 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, in which the RF signals are transmitted by a transmit chain connected to the antenna array.
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Accused Products
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.
61 Citations
19 Claims
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1. A method for detecting unused frequency bands in a cognitive radio network, comprising the steps of:
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sensing a plurality of frequency bands for RF signals using an antenna array including a plurality of elements coupled to a receive RF chain, in which the plurality of elements are individually controllable; sensing, for each frequency band, a plurality of spatial directions for the RF signals using the antenna array including the plurality elements coupled to the receive RF chain; and assigning a particular frequency band and a particular direction as an available frequency band and an available direction 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, in which the RF signals are transmitted by a transmit chain connected to the antenna array. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification