Generation of signals with unpredictable transmission properties for wireless M2M networks

• US 20190320303A1
• Filed: 10/15/2018
• Published: 10/17/2019
• Est. Priority Date: 01/05/2013
• Status: Active Grant

• Current Assignee: Brian G. Agee
• Original Assignee: Brian G. Agee
• Inventors: Agee, Brian G
• Granted Patent: US 10,812,955 B2
• Time in Patent Office: Days
• CPC Class Codes: H04B 1/69 Spread spectrum techniques
• CPC Class Codes: H04B 1/692 Hybrid techniques using combinations of two or more spread spectrum techniques
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04B 1/7103 the interference being multiple access interference
• CPC Class Codes: H04B 1/7156 Arrangements for sequence synchronisation
• CPC Class Codes: H04B 2001/7154 with means for preventing interference
• CPC Class Codes: H04J 13/0007 Code type
• CPC Class Codes: H04J 13/0062 Zadoff-Chu
• CPC Class Codes: H04W 4/70 Services for machine-to-machine communication [M2M] or machine type communication [MTC]

Abstract

A method and apparatus for generation of signals with unpredictable transmission properties allowing physically secure, unscheduled and interference-resistant communication over machine-to-machine (M2M) networks is claimed. A physical dwell structure comprising time slots and frequency channels is established, and a combination of unpredictable physical dwells, spread spectrum modulation formats employing unpredictable spreading vectors, and additional physical properties allowing unpredictable selection of intended receivers is described. These unpredictable transmission properties enable receivers employing blind detection and signal separation techniques to detect and extract transmissions intended for the receive, and excise transmissions not intended for the receiver, as part of the despreading procedure, and even if those transmissions are received at a much higher power level than the intended transmissions. The resultant system eliminates the ability for an adversary to predict and override M2M transmissions; allows reception of ad-hoc transmissions in dense environments without scheduling, CSMA/CA protocols, or feedback paths enabling scheduling, and allows macrodiverse reception of transmissions at networks of connected receivers, thereby providing additional efficiency and security improvements by exploiting the route diversity of the network.

Claims

1. A method of data transmission, comprising:

establishing a physical dwell structure, comprising a plurality of time slots and at least one frequency channel; and

a data transmitter, in the course of transmitting data, varying data transmission properties in a manner known only to that data transmitter, comprising varying a spreading vector and at least one of the following data transmission properties;

physical dwell, symbol mask and intended receiver;

wherein unpredictability of the data transmission properties provides for at least one of;

security of the data;

operation without scheduling of intercommunications;

elimination of feedback paths; and

operation without collision avoidance methods.

2. The method of claim 1, wherein the spreading vector is a random spreading vector derived from a physical phenomenon.

3. The method of claim 1, wherein the spreading vector is a pseudo-random spreading vector.

4. The method of claim 1, wherein at least one of the data transmission properties is varied in a manner unknown to the receiver.

5. The method of claim 1, wherein at least one of the data transmission properties is varied in a random manner.

6. The method of claim 1, wherein at least one of the data transmission properties is varied by selecting from a finite set of values a value for the at least one of the data transmission properties.

7. The method of claim 1, wherein the symbol mask is an unpredictable source symbol mask.

8. The method of claim 7, wherein the source symbol mask is a cyclic-shift, Zadoff-Chu code.

9. The method of claim 1, wherein the symbol mask is a receive symbol mask that is known to the intended receiver.

10. The method of claim 1, wherein the symbol mask is applied in the time domain.

11. The method of claim 1, wherein the symbol mask is applied in the frequency domain.

12. The method of claim 1, comprising varying physical dwell by varying a time slot.

13. The method of claim 1, comprising varying physical dwell by varying a frequency channel.

14. The method of claim 1, comprising establishing a framing structure in addition to the time slot and channel structure.

15. The method of claim 1 comprising varying the symbol mask, wherein the symbol mask is separated into an unpredictable source symbol mask and a receive symbol mask that is known to the intended receiver.

16. The method of claim 9, in which the receive symbol mask is unpredictably varied, thereby providing unpredictable variation of the intended receiver.

17. A method of data transmission, comprising:

establishing a physical dwell structure, comprising a plurality of time slots and at least one frequency channel;

obtaining transmit data by repeating a plurality of times data of a data burst; and

a data transmitter, in the course of transmitting the transmit data, varying data transmission properties in a manner known only to that data transmitter, comprising varying a spreading vector and at least one of the following data transmission properties;

physical dwell, symbol mask and intended receiver;

wherein unpredictability of the data transmission properties provides for at least one of;

security of the data;

operation without scheduling of intercommunications;

elimination of feedback paths; and

operation without collision avoidance methods.

18. The method of claim 17 comprising varying the spreading vector, wherein the spreading vector is separated into an unpredictable source spreading vector and a receive spreading vector that is known to the intended receiver.

19. The method of claim 17, comprising unpredictably varying the receive symbol mask, thereby providing unpredictable variation of the intended receiver.

20. The method of claim 17, wherein the data burst includes a cyclic prefix.