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 minimizes the probability of interfering with existing legacy users. 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 are provided. 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 multiple transceivers in a wireless network. 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 are provided.
1. In a wireless communications network comprising a multiplicity of nodes and configured to transmit a data stream along a route from a source node in the network to a destination node in the network according to a routing protocol, a method of managing real-time data traffic, the method comprising the steps of:
receiving at an intermediate node in the route a data packet from the data stream and a request to transmit the data packet to a next node in the route;
determining whether the next node is operating in a receiving mode;
incorporating the data packet into a waveform containing a pattern uniquely associated with a node;
if the next node is operating in the receiving mode, transmitting the data packet to the next node;
if the next node is not operating in the receiving mode, forwarding the data packet to any other node in the multiplicity of nodes that is both in the receiving mode and nearer to the destination node than the intermediate node.
2. The method of claim 1 , wherein the step of forwarding comprises the step of determining whether the any other node is operating in the receiving mode.
3. The method of claim 1 , further comprising the step of periodically repeating the step of determining whether the next node is operating in the receiving mode.
4. The method of claim 1 , wherein the pattern uniquely associated with a node is a pattern uniquely associated with the next node.
5. The method of claim 4 , wherein the next node comprises a correlator configured to detect the pattern.
6. The method of claim 1 , wherein the pattern uniquely associated with a node is a pattern uniquely associated with the any other node.
7. The method of claim 6 , wherein the any other node comprises a correlator configured to detect the pattern.
8. A communications device in a wireless communications network comprising a multiplicity of nodes and configured to transmit a data stream along a route from a source node in the network to a destination node in the network according to a routing protocol, the communications device comprising:
a receiver configured to receive a data packet from the data stream and a request to transmit the data packet to a next node in the route;
a processor configured to:
determine whether the next node is operating in a receiving mode; and
incorporate the data packet into a waveform containing a pattern uniquely associated with a node; and
a transmitter configured to:
transmit the data packet to the next node if the next node is operating in the receiving mode; and
if the next node is not operating in the receiving mode, forward the data packet to any other node in the multiplicity of nodes that is both in the receiving mode and nearer to the destination node than the communications device.
9. The communications device of claim 8 , wherein the processor is further configured to determine whether the any other node is operating in the receiving mode.
10. The communications device of claim 8 , wherein the processor is further configured to periodically repeat the step of determining whether the next node is operating in the receiving mode.
11. The communications device of claim 8 , wherein the pattern uniquely associated with a node is a pattern uniquely associated with the next node.
12. The communications device of claim 11 , wherein the next node comprises a correlator configured to detect the pattern.
13. The communications device of claim 8 , wherein the pattern uniquely associated with a node is a pattern uniquely associated with the any other node.
14. The communications device of claim 13 , wherein the any other node comprises a correlator configured to detect the pattern.