Spectrum-adaptive networking
View Patent ↗The present invention increases the available spectrum in a wireless network by sharing existing allocated (and in-use) portions of the RF spectrum in a manner that will minimize the probability of interfering with existing legacy users. The invention provides interference temperature-adaptive waveforms, and a variety of physical and media access control protocols for generating waveforms based on measurement and characterization of the local spectrum. The invention measures the local spectrum at a receiving node, generates an optimal waveform profile specifying transmission parameters that will water-fill unused spectrum up to an interference limit without causing harmful interference to primary and legacy transmitters using the same frequency bands, and enables simultaneous transmit and receive modes at a multiplicity of transceivers in a wireless network. The invention also provides closed loop feedback control between nodes, co-site interference management, intersymbol interference mitigation, wide sense stationary baseband signaling and modulation, and power limited signaling for avoiding detection and interception.
1. A method of managing interference in a radio communications network, the radio communications network having a multiplicity of nodes, each node in the multiplicity having attached thereto a set of antennas, each antenna in the set being oriented in a unique direction relative to other antennas attached to each the node, the method comprising the steps of:
dividing the multiplicity of nodes into a plurality of node clusters;
assigning a unique receiving frequency to each node in at least one node cluster;
assigning a unique transmission frequency to each antenna in the set of antennas attached to a first node in the at least one node cluster;
wherein the unique transmission frequency assigned to the each antenna corresponds to the unique receiving frequency assigned to a neighboring node in the at least one node cluster; and
wherein the neighboring node is located in the unique direction in which each the antenna is oriented to face.
2. The method of claim 1 , further comprising the step of transmitting an outgoing message from the first node to the neighboring node via a transmitting antenna in the set of antennas attached to the first node using the unique receiving frequency assigned to the neighboring node.
3. The method of claim 2 , further comprising the step of transmitting a second outgoing message from the first node to another neighboring node in the at least one node cluster via a second transmitting antenna in the set of antennas attached to the first node using the unique receiving frequency assigned to the another neighboring node.
4. The method of claim 3 , wherein the step of transmitting the outgoing message to the neighboring node and the step of transmitting the second outgoing message to the another neighboring node are carried out simultaneously.
5. The method of claim 2 , further comprising the step of receiving, at the first node, via a second antenna in the set of antennas attached to the first node, an incoming message from another neighboring node in the at least one node cluster, using the unique receiving frequency assigned to the first node.
6. The method of claim 5 , wherein the step of transmitting the outgoing message to the neighboring node and the step of receiving the incoming message from the another neighboring node are carried out simultaneously.