System and Method for Unsynchronized Cooperative Spectrum Sensing in Cognitive Radio Nodes
AssigneeFuturewei Technologies, Inc.
InventorsXiangwei Zhou, Young Hoon Kwon, Anthony C.K. Soong
Life of this patent
Estimating the term…
Abstract
System and method for unsynchronized cooperative spectrum sensing in cognitive radio nodes. A method comprises receiving spectrum sensing information from a plurality of communications nodes, computing for each communications node in the plurality of communications nodes, a likelihood ratio based on spectrum sensing information provided by the communications node, combining the likelihood ratios, and computing a decision value based on the combined likelihood ratio. Each communications node determines its respective spectrum sensing information at a time unrelated to times when other communications nodes determine their spectrum sensing information.
Claims21
A method for performing cooperative spectrum sensing for a frequency band, the method comprising:
- receiving spectrum sensing information from a plurality of communications nodes, wherein each communications node determines its respective spectrum sensing information at a time unrelated to times when other communications nodes in the plurality of communications nodes determine their spectrum sensing information;
- computing for each communications node in the plurality of communications nodes, a likelihood ratio based on spectrum sensing information provided by the communications node;
- combining the likelihood ratios;
- and
- computing a decision value based on the combined likelihood ratio.
A method for performing unsynchronized cooperative spectrum sensing for a frequency band, the method comprising:
- receiving a decision about a state of the frequency band from each node in a plurality of nodes, wherein each decision is determined at a time unrelated to times when other nodes in the plurality of nodes determine their corresponding decisions;
- computing for each received decision, a likelihood ratio based on the received decision;
- computing a combined likelihood ratio from the computed likelihood ratios;
- determining a combined decision from the combined likelihood ratio;
- and
- providing the combined decision to the plurality of nodes.
An electronic device comprising:
- a receiver configured to process signals transmitted over the air;
- a transmitter configured to process signals to be transmitted over the air;
- a processor coupled to the receiver and to the transmitter, the processor configured to compute a likelihood ratio for each decision about a state of a frequency band received by the electronic device, wherein each decision is provided by a communications node out of a plurality of communications nodes and each decision is made at a time independent of times when other communications nodes make their decisions, to compute a combined likelihood ratio from the likelihood ratios, and to make a decision about a state of the frequency band based on the combined likelihood ratio;
- and
- a memory coupled to the processor, the memory to store the received decisions, the computed likelihood ratios, and the combined likelihood ratio.
A communications network comprising:
- a plurality of nodes, each node configured to make a decision about a state of a frequency band by sensing a spectrum of the frequency band, wherein at each node in the plurality of nodes, the sensing of the spectrum occurs at a time unrelated to times when other nodes in the plurality of nodes sense the spectrum;
- and
- a combining node coupled to the plurality of nodes, the combining node configured to receive from each node in the plurality of nodes the decision about the state of the frequency band and to compute a combined decision from the received decisions.
Dependencies are inferred from the claim text.