Method and apparatus for adjusting waveform parameters for an adaptive air interface waveform

• US 20080113624A1
• Filed: 11/10/2006
• Published: 05/15/2008
• Est. Priority Date: 11/10/2006
• Status: Active Grant

• Current Assignee: Raytheon Company (Rtx Corporation)
• Original Assignee: POWERWAVE COGNITION, INC.
• Inventors: Breinig, Robert J., Paris, Bernd-Peter, Seidel, Scott Y., Franceschini, Michael R., Livingston, Jay N.
• Granted Patent: US 8,208,873 B2
• Time in Patent Office: Days
• US Class Current: 455/67.13
• CPC Class Codes: H04L 1/0001 Systems modifying transmission characteristics according to link quality, e.g. power backoff adaptive data allocation for multicarrier modulation H04L5/0044; controlling transmission power for radio systems H04W52/04
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0006 by adapting the transmission format
• CPC Class Codes: H04L 1/0009 by adapting the channel coding H04L1/1812 takes precedence
• CPC Class Codes: H04L 1/0015 characterised by the adaptation strategy
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/206 for modulated signals
• CPC Class Codes: H04L 2001/0093 Point-to-multipoint

Abstract

Adjusting parameters of a waveform includes facilitating wireless communication between a transmitting node and receiving nodes, where the transmitting node communicates with a receiving node over a channel. Spectrum conditions are estimated, where a spectrum condition describes spectrum utilization in the vicinity of surrounding nodes. Channel conditions are estimated, where a channel condition describes a channel of the plurality of channels. Waveform parameters are adjusted in response to the spectrum conditions and the channel conditions.

Claims

1. A method for adjusting one or more parameters of a waveform, comprising:

facilitating wireless communication between a transmitting node and one or more receiving nodes, the transmitting node communicating with a receiving node over one or more channels of a plurality of channels;

estimating one or more spectrum conditions, a spectrum condition describing spectrum utilization in the vicinity of one or more surrounding nodes;

estimating one or more channel conditions, a channel condition describing a channel of the plurality of channels; and

adjusting one or more waveform parameters in response to the one or more spectrum conditions and the one or more channel conditions.

2. The method of claim 1, wherein estimating the one or more spectrum conditions further comprises at least one of:

estimating one or more available spectrum holes for the transmitting node and a receiving node of the one or more receiving nodes; and

3. The method of claim 1, wherein estimating the one or more spectrum conditions further comprises:

estimating one or more available spectrum holes for the transmitting node and a receiving node of the one or more receiving nodes, and estimating one or more merged available spectrum holes for the transmitting node and a plurality of receiving nodes of the one or more receiving nodes.

4. The method of claim 1, wherein estimating the one or more channel conditions further comprises:

sending a probe signal from the transmitting node to a receiving node of the one or more receiving nodes over a channel;

receiving a reply message comprising channel estimation information for the channel; and

estimating a channel condition for the channel from the channel estimation information.

5. The method of claim 1, wherein estimating the one or more channel conditions further comprises:

estimating a coherence bandwidth for a channel;

estimating a coherence time for the channel; and

estimating a channel condition for the channel from the coherence bandwidth and the coherence time.

6. The method of claim 1, wherein estimating the one or more channel conditions further comprises:

estimating a coherence bandwidth for a channel;

estimating a coherence time for the channel;

generating a coherent integration block from the coherence bandwidth and the coherence time, the coherent integration block describing the bandwidth over which a plurality of frequencies of a signal are likely to experience correlated amplitude fading, the coherent integration block describing the time during which the signal remains coherent; and

estimating a channel condition for the channel from the coherent integration block.

7. The method of claim 1, further comprising:

determining that the one or more receiving nodes are operable to perform a heteromorphic waveform process, the one or more receiving nodes replying to the transmitter indicating ability to adjust the one or more waveform parameters.

8. The method of claim 1, wherein adjusting the one or more waveform parameters further comprises:

establishing one or more transmitted waveform formats, a transmitted waveform format derived from a channel condition.

9. The method of claim 1, wherein adjusting the one or more waveform parameters further comprises:

establishing one or more transmitted waveform formats, a transmitted waveform format derived from a channel condition; and

generating a merged waveform format from the one or more transmitted waveform formats, the merged waveform format designating a waveform format for communication.

10. The method of claim 1, wherein adjusting the one or more waveform parameters further comprises:

establishing one or more transmitted waveform formats, a transmitted waveform format derived from a spectrum condition.

11. The method of claim 1, wherein adjusting the one or more waveform parameters further comprises:

establishing one or more transmitted waveform formats, a transmitted waveform format derived from a spectrum condition; and

generating a merged waveform format from the one or more transmitted waveform formats, the merged waveform format designating a waveform format for communication.

12. The method of claim 1, wherein adjusting the one or more waveform parameters further comprises:

establishing one or more transmitted waveform formats, a transmitted waveform format derived from a channel condition and a spectrum condition.

13. The method of claim 1, wherein adjusting the one or more waveform parameters further comprises:

establishing one or more transmitted waveform formats, a transmitted waveform format derived from a channel condition and a spectrum condition; and

generating a merged waveform format from the one or more transmitted waveform formats, the merged waveform format designating a waveform format for communication.

14. The method of claim 1, wherein adjusting the one or more waveform parameters further comprises:

forming a spectral occupancy mask, the spectral occupancy mask determining how a signal utilizes a spectrum.

15. The method of claim 1, wherein adjusting the one or more waveform parameters further comprises:

adjusting a coding parameter, a coding parameter describing coding of a signal.

16. The method of claim 1, wherein adjusting the one or more waveform parameters further comprises:

embedding one or more waveform parameters in a transmitted waveform format, a waveform parameter used to decode the signal.

17. A transmitting node operable to adjust one or more parameters of a waveform, comprising:

an interface operable to;

facilitate wireless communication with one or more receiving nodes, the interface operable to communicate with a receiving node over one or more channels of a plurality of channels; and

a processor coupled to the interface and operable to;

estimate one or more spectrum conditions, a spectrum condition describing spectrum utilization in the vicinity of one or more surrounding nodes;

estimate one or more channel conditions, a channel condition describing a channel of the plurality of channels; and

adjust one or more waveform parameters in response to the one or more spectrum conditions and the one or more channel conditions.

18. The node of claim 17, the processor further operable to estimate the one or more spectrum conditions by:

estimating one or more available spectrum holes for the transmitting node and a receiving node of the one or more receiving nodes; and

estimating one or more merged available spectrum holes for the transmitting node and a plurality of receiving nodes of the one or more receiving nodes.

19. The node of claim 17, the processor further operable to estimate the one or more channel conditions by:

sending a probe signal from the transmitting node to a receiving node of the one or more receiving nodes over a channel;

receiving a reply message comprising channel estimation information for the channel; and

estimating a channel condition for the channel from the channel estimation information.

20. The node of claim 17, the processor further operable to estimate the one or more channel conditions by:

estimating a coherence bandwidth for a channel;

estimating a coherence time for the channel; and

estimating a channel condition for the channel from the coherence bandwidth and the coherence time.

21. The node of claim 17, the processor further operable to estimate the one or more channel conditions by:

estimating a coherence bandwidth for a channel;

estimating a coherence time for the channel;

generating a coherent integration block from the coherence bandwidth and the coherence time, the coherent integration block describing the bandwidth over which a plurality of frequencies of a signal are likely to experience correlated amplitude fading, the coherent integration block describing the time during which the signal remains coherent; and

estimating a channel condition for the channel from the coherent integration block.

22. The node of claim 17, the processor further operable to estimate the one or more channel conditions by:

estimating a coherence bandwidth for a channel of the plurality of channels;

estimating a coherence time for the channel;

generating a coherent integration block from the coherence bandwidth and the coherence time, the coherent integration block describing bandwidth over which a plurality of frequencies of a signal are likely to experience correlated amplitude fading, the coherent integration block describing the time during which the signal remains coherent; and

estimating a channel condition for the channel from the coherent integration block; and

defining a transmitter waveform format for the transmitting node and a receiving node of the one or more receiving nodes.

23. The node of claim 17, the processor further operable to estimate the one or more channel conditions by:

estimating a coherence bandwidth for a channel of the plurality of channels;

estimating a coherence time for the channel;

generating a coherent integration block from the coherence bandwidth and the coherence time, the coherent integration block describing bandwidth over which a plurality of frequencies of a signal are likely to experience correlated amplitude fading, the coherent integration block describing the time during which the signal remains coherent; and

estimating a channel condition for the channel from the coherent integration block; and

defining one or more transmitter waveform formats, a transmitter waveform format being for the transmitting node and a receiving node of the one or more receiving nodes; and

defining a merged waveform format from the one or more transmitter waveform formats.

24. The node of claim 17, the processor further operable to:

determine that the one or more receiving nodes are operable to perform a heteromorphic waveform process.

25. The node of claim 17, the processor further operable to adjust the one or more waveform parameters by:

adjusting a spectral occupancy mask, the spectral occupancy mask determining how a signal utilizes spectrum.

26. The node of claim 17, the processor further operable to adjust the one or more waveform parameters by:

adjusting a coding parameter, a coding parameter describing coding of a signal.

27. The node of claim 17, the processor further operable to adjust the one or more waveform parameters by:

adjusting a coding parameter, the coding parameter describing coding of a signal; and

embedding the one or more waveform parameters in a transmitted waveform format, a waveform parameter used to decode the signal.

28. A system for adjusting one or more waveform parameters of a waveform, comprising:

means for facilitating wireless communication between a transmitting node and one or more receiving nodes, the transmitting node communicating with a receiving node over one or more channels of a plurality of channels;

means for estimating one or more spectrum conditions, a spectrum condition describing spectrum utilization by one or more surrounding nodes;

means for estimating one or more channel conditions, a channel condition describing a channel; and

means for adjusting one or more waveform parameters in response to the one or more spectrum conditions and the one or more channel conditions.

29. A method for adjusting one or more waveform parameters of a waveform, comprising:

facilitating wireless communication between a transmitting node and one or more receiving nodes, the transmitting node communicating with a receiving node over one or more channels of a plurality of channels;

determining that the one or more receiving nodes are operable to perform a heteromorphic waveform process;

estimating one or more spectrum conditions, a spectrum condition describing spectrum utilization by one or more surrounding nodes;

estimating one or more channel conditions, a channel condition describing a channel of the plurality of channels, estimating the one or more channel conditions further comprising;

sending a probe signal from the transmitting node to a receiving node of the one or more receiving nodes over a channel;

receiving a reply message comprising channel estimation information for the channel;

estimating a channel condition for the channel from the channel estimation information;

estimating a coherence bandwidth for the channel;

estimating a coherence time for the channel;

generating a coherent integration block from the coherence bandwidth and the coherence time, the coherent integration block describing the bandwidth over which a plurality of frequencies of a signal are likely to experience correlated amplitude fading, the coherent integration block describing the time during which the signal remains coherent;

estimating a channel condition for the channel from the coherent integration block;

estimating one or more received waveform formats, a received waveform format describing a channel condition;

determining a minimum integration block size of the one or more received waveform formats; and

generating a merged waveform format from the minimum bandwidth value and the minimum time value, the merged waveform format designating a waveform format for communication; and

adjusting one or more waveform parameters in response to the one or more spectrum conditions and the one or more channel conditions, adjusting the one or more waveform parameters further comprising;

adjusting a spectral occupancy mask, a spectral occupancy mask determining how a signal utilizes a spectrum; and

adjusting a coding parameter, a coding parameter describing coding of a signal.