Non-orthogonal frequency-division multiplexed communication through a non-linear transmission medium

• US 7,852,745 B2
• Filed: 03/03/2008
• Issued: 12/14/2010
• Est. Priority Date: 03/02/2007
• Status: Expired due to Fees

• Current Assignee: Signalink Technologies Inc.
• Original Assignee: Signalink Technologies Inc.
• Inventors: Carroll, Sean C.
• Primary Examiner(s): Pham; Chi H
• Assistant Examiner(s): HYUN, SOON D
• Application Number:
  US12/073,223
• Publication Number:
  US 20080253400A1
• Time in Patent Office: 1,016 Days
• Field of Search: None
• US Class Current: 370/206
• CPC Class Codes: H04J 1/12 Arrangements for reducing cross-talk between channels in line transmission systems H04B3/32; in cables or lines H04B3/26 - H04B3/30
• CPC Class Codes: H04L 27/26 Systems using multi-frequency codes H04L27/32 takes precedence
• CPC Class Codes: H04L 5/06 the signals being represented by different frequencies combined with time-division multiplexing H04L5/26

Abstract

A method for non-orthogonal frequency division multiplexed communication through a non-linear transmission medium includes the steps of selecting at least one desired bandwidth, selecting a non-orthogonal pair of base frequencies within a first bandwidth of the at least one desired bandwidth, identifying where primary intermodulation products formed as a result of signal transmission on the pair of base frequencies fall within the first bandwidth. The method may also include the step of selecting a plurality of non-orthogonal interleaved frequencies adjacent at least one of the pair of base frequencies so as to be interleaved between the primary intermodulation products to form a frequency cluster which includes the at least one of the pair of base frequencies and the interleaved frequencies.

Claims

1. A method for non-orthogonal frequency division multiplexed communication through a non-linear transmission medium, the method comprising the steps of:

(a) selecting at least one desired bandwidth;

(b) selecting a non-orthogonal pair of base frequencies within a first bandwidth of said at least one desired bandwidth by a device;

(c) identifying where primary intermodulation products formed as a result of signal transmission on said pair of base frequencies fall within said first bandwidth by said device;

(d) selecting a plurality of non-orthogonal interleaved frequencies adjacent at least one of said pair of base frequencies so as to be interleaved between said primary intermodulation products to form a frequency cluster which includes said at least one of said pair of base frequencies and said interleaved frequencies,

further comprising the step of adapting said at least one frequency cluster for sending a high priority communication on said at least one frequency cluster or for sending a high bandwidth communication on said at least one frequency cluster.

2. The method of claim 1 further comprising the step of adapting said at least one frequency cluster for sending a redundant communication on said at least one frequency cluster.

3. The method of claim 2 further comprising the step of adapting said frequency cluster for sending a communication in bursts in parallel during periods of reduced noise interference.

4. The method of claim 1 wherein said plurality of non-orthogonal interleaved frequencies are non-harmonic.

5. The method of claim 1 wherein said step of selecting said pair of base frequencies includes further selecting a third base frequency within said first bandwidth wherein said third base frequency is outside of said primary intermodulation products.

6. The method of claim 1 wherein said step of selecting a plurality of non-orthogonal interleaved frequencies includes selecting non-orthogonal interleaved frequencies that fill-in between said pair of base frequencies.

7. The method of claim 1 wherein said step of selecting a plurality, of non-orthogonal interleaved frequencies includes selecting non-orthogonal interleaved frequencies that cluster adjacent a single base frequency of said pair of base frequencies.

8. A method for non-orthogonal frequency division multiplexed communication through a non-linear transmission medium, the method comprising the steps of:

(a) selecting at least one desired bandwidth;

(b) selecting a non-orthogonal pair of base frequencies within a first bandwidth of said at least one desired bandwidth by a device;

(c) identifying where primary intermodulation products formed as a result of signal transmission on said pair of base frequencies fall within said first bandwidth by said device;

(d) selecting a plurality of non-orthogonal interleaved frequencies adjacent at least one of said pair of base frequencies so as to be interleaved between said primary intermodulation products to form a frequency cluster which includes said at least one of said pair of base frequencies and said interleaved frequencies,

wherein said step of selecting non-orthogonal interleaved frequencies includes selecting non-orthogonal interleaved frequencies that cluster on adjacent frequencies so as to sandwich said single base frequency between said adjacent frequencies.

9. The method of claim 8 further comprising the step of adapting said at least one frequency cluster for sending a redundant communication on said at least one frequency cluster.

10. The method of claim 8 further comprising the step of adapting said frequency cluster for sending a communication in bursts in parallel during periods of reduced noise interference.

11. The method of claim 8 wherein said plurality of non-orthogonal interleaved frequencies are non-harmonic.

12. The method of claim 8 wherein said step of selecting said pair of base frequencies includes further selecting a third base frequency within said first bandwidth wherein said third base frequency is outside of said primary intermodulation products.

13. The method of claim 8 wherein said step of selecting a plurality of non-orthogonal interleaved frequencies includes selecting non-orthogonal interleaved frequencies that fill-in between said pair of base frequencies.

14. A method for non-orthogonal frequency division multiplexed communication through a non-linear transmission medium, the method comprising the steps of:

(a) selecting at least one desired bandwidth;

(b) selecting a non-orthogonal pair of base frequencies within a first bandwidth of said at least one desired bandwidth by a device;

(c) identifying where primary intermodulation products formed as a result of signal transmission on said pair of base frequencies fall within said first bandwidth by a device;

(d) selecting a plurality of non-orthogonal interleaved frequencies adjacent at least one of said pair of base frequencies so as to be interleaved between said primary intermodulation products to form a frequency cluster which includes said at least one of said pair of base frequencies and said interleaved frequencies,

further including the step of selecting a second bandwidth of said at least one desired bandwidth, so as to at least partially but not entirely overlap said first bandwidth to thereby form corresponding first and second partially overlapping frequency groups.

15. The method of claim 14 further comprising the step of arranging so that said first frequency group is, with the exception of said overlap, of higher frequency than said second frequency group.

16. The method of claim 15 further comprising the steps of;

and within said second frequency group;

(a) selecting a non-orthogonal second pair of base frequencies;

(b) identifying where second primary intermodulation products form as a result of signal transmission on said second pair of base frequencies within said second frequency group;

(c) selecting a plurality of non-orthogonal second interleaved frequencies adjacent at least one of said, second pair of base frequencies so as to be interleaved between said second primary intermodulation products to form a second frequency cluster which includes said at least one of said second pair of base frequencies and said second interleaved frequencies.

17. A method for non-orthogonal frequency division multiplexed communication through a non-linear transmission medium, the method comprising the steps of:

(a) selecting at least one desired bandwidth;

(b) selecting a non-orthogonal pair of base frequencies within a first bandwidth of said at least one desired bandwidth by a device;

(c) identifying where primary intermodulation products formed as a result of signal transmission on said pair of base frequencies fall within said first bandwidth by a device so as to enable the selection of additional frequencies which avoid said primary intermodulation products,

further comprising the step of selecting a plurality of non-orthogonal interleaved frequencies adjacent at least one of said pair of base frequencies so as to be interleaved between said primary intermodulation products to form a frequency cluster which includes said at least one of said pair of base frequencies and said interleaved frequencies,

wherein said plurality of non-orthogonal interleaved frequencies are non-harmonic,

wherein said step of selecting a plurality of non-orthogonal interleaved frequencies includes selecting non-orthogonal interleaved frequencies that fill-in between said pair of base frequencies,

wherein said step of selecting non-orthogonal interleaved frequencies includes selecting non-orthogonal interleaved frequencies that cluster on adjacent frequencies so as to sandwich said single base frequency between said adjacent frequencies.

18. A method for non-orthogonal frequency division multiplexed communication through a non-linear transmission medium, the method comprising the steps of:

(a) selecting at least one desired bandwidth;

(b) selecting a non-orthogonal pair of base frequencies within a first bandwidth of said at least one desired bandwidth by a device;

(c) identifying where primary intermodulation products formed as a result of signal transmission on said pair of base frequencies fall within said first bandwidth by said device so as to enable the selection of additional frequencies which avoid said primary intermodulation products,

further including the step of selecting a second bandwidth of said at least one desired bandwidth, so as to at least partially but not entirely overlap said first bandwidth to thereby form corresponding first and second partially overlapping frequency groups.

19. The method of claim 18 further comprising the step of arranging so that said first frequency group is, with the exception of said overlap, of higher frequency than said second frequency group.