Modulation and multiple access technique using orbital angular momentum

• US 10,516,486 B2
• Filed: 01/04/2017
• Issued: 12/24/2019
• Est. Priority Date: 08/08/2014
• Status: Active Grant

• Current Assignee: Nxgen Partners Ip, LLC (NxGen Partners LLC)
• Original Assignee: Nxgen Partners Ip, LLC (NxGen Partners LLC)
• Inventors: Ashrafi, Solyman, Linquist, Roger
• Primary Examiner(s): Mian, Omer S
• Application Number:
  US15/398,511
• Publication Number:
  US 20170117994A1
• Time in Patent Office: 1,084 Days
• CPC Class Codes: H04B 10/516 Details of coding or modulation
• CPC Class Codes: H04B 10/532 Polarisation modulation
• CPC Class Codes: H04B 10/548 Phase or frequency modulation
• CPC Class Codes: H04J 11/00 Orthogonal multiplex systems, e.g. using WALSH codesH04J13/00 takes precedence
• CPC Class Codes: H04J 14/00 Optical multiplex systems
• CPC Class Codes: H04L 27/2627 Modulators
• CPC Class Codes: H04L 27/2637 with direct modulation of individual subcarriers

Abstract

A system includes an interface for receiving a plurality of data streams from a plurality of data sources. A multiplexor groups the plurality of data streams into a plurality of groups. A plurality of orthogonal frequency division multiplexing (OFDM) processing circuitries apply a same OFDM processing to each of the plurality of groups using a same combination of frequency and time slot combinations on each of the plurality of groups. A modulator modulates each of the OFDM processed groups onto a same signal bandwidth by applying a different, unique orthogonal function to each of the OFDM processed groups. The unique orthogonal functions defined by a path on and between the surfaces of a plurality of concentric orthogonal state spheres defining each of the different, unique orthogonal functions. A transmitter transmits modulated OFDM processed groups over the communications link in accordance with each of the different, unique orthogonal functions defined by the path on and between the surfaces of the plurality of concentric orthogonal state spheres.

Claims

1. A method for multiple access communications over a communications link comprising:

receiving a plurality of data streams from a plurality of data sources;

grouping the plurality of data streams into a plurality of groups;

applying orthogonal frequency division multiplexing (OFDM) processing to each of the plurality of groups, wherein each of the plurality of groups re-uses a combination of frequency and time slot combinations in the OFDM processing;

modulating each of the plurality of OFDM processed groups onto a same signal bandwidth by applying a different, unique orthogonal function to each of the plurality of OFDM processed groups, each of the unique orthogonal functions being a unique orbital angular momentum carried by electromagnetic waves,

wherein the modulation is defined by a path on and between surfaces of a plurality of concentric orthogonal state spheres, and wherein the modulation is performed using the unique orbital angular momentum of the electromagnetic waves as a degree of freedom; and

transmitting the modulated OFDM processed groups over the communications link in accordance with each of the different, unique orthogonal functions.

2. The method of claim 1 further comprising:

receiving the modulated OFDM processed groups over the communications link;

demodulating each of the received modulated OFDM processed groups in accordance with the unique orthogonal functions defined by the path on and between the surfaces of the plurality of concentric orthogonal state spheres defining the different, unique orthogonal function for each of the OFDM processed groups;

separating the plurality of OFDM processed groups into the separate OFDM processed groups;

removing the OFDM processing from each of the OFDM processed groups to provide the plurality of data streams; and

outputting the plurality of data streams.

3. The method of claim 1, wherein the step of transmitting further comprises transmitting the modulated OFDM processed groups over an RF communications link.

4. The method of claim 1, wherein the step of transmitting further comprises transmitting the modulated OFDM processed groups over an optical communications link.

5. The method of claim 1, wherein the step of applying orthogonal frequency division multiplexing (OFDM) processing further comprises the step of generating a plurality of grids of channel slots, each grid of the plurality of grids of channel slots defining a plurality of channel slots, each of the channel slots identified by an associated time and frequency.

6. The method of claim 5, wherein the step of modulating further comprises applying a different orthogonal function to each of the plurality of grids of channel slots.

7. A system for providing multiple access communications over a communications link, comprising:

an interface for receiving a plurality of data streams from a plurality of data sources;

a multiplexor for grouping the plurality of data streams into a plurality of groups;

a plurality of orthogonal frequency division multiplexing (OFDM) processing circuitries for applying a same OFDM processing to each of the plurality of groups, wherein each of the plurality of OFDM processing circuitries uses a same combination of frequency and time slot combinations on each of the plurality of groups;

a modulator for modulating each of the plurality of OFDM processed groups onto a same signal bandwidth by applying a different, unique orthogonal function to each of the plurality of OFDM processed groups, each of the unique orthogonal functions being a unique orbital angular momentum carried by electromagnetic waves,

wherein the modulation is defined by a path on and between surfaces of a plurality of concentric orthogonal state spheres, and wherein the modulation is performed using the unique orbital angular momentum of the electromagnetic waves as a degree of freedom; and

a transmitter transmitting modulated OFDM processed groups over the communications link in accordance with each of the different, unique orthogonal functions.

8. The system of claim 7 further comprising:

a receiver for receiving the modulated OFDM processed groups over the communications link;

a demodulator for demodulating each of the received modulated OFDM processed groups in accordance with the unique orthogonal functions defined by the path on and between the surfaces of the plurality of concentric orthogonal state spheres defining the different, unique orthogonal function for each of the OFDM processed groups;

a second multiplexor for separating the plurality of OFDM processed groups into the separate OFDM processed groups; and

a second plurality of OFDM processing circuitries for removing the OFDM processing from each of the OFDM processed groups to provide the plurality of data streams.

9. The system of claim 7, wherein the transmitter further transmits the modulated OFDM processed groups over an RF communications link.

10. The system of claim 7, wherein the transmitter further transmits the modulated OFDM processed groups over an optical communications link.

11. The system of claim 7, wherein the orthogonal frequency division multiplexing (OFDM) processing circuitry further generates a plurality of grids of channel slots, each grid of the plurality of grids of channel slots defining a plurality of channel slots, each of the channel slots identified by an associated time and frequency.

12. The system of claim 11, wherein the modulator applies a different orthogonal function to each of the plurality of grids of channel slots.

13. A method for multiple access communications over a communications link comprising:

receiving a plurality of data streams from a plurality of data sources;

grouping the plurality of data streams into a plurality of groups;

applying orthogonal frequency division multiplexing (OFDM) processing to each of the plurality of groups, wherein each of the plurality of groups uses a same combination of frequency and time slot combinations in the OFDM processing;

modulating each of the plurality of OFDM processed groups onto a same signal bandwidth by applying one of a different, unique orthogonal function being a unique orbital angular momentum carried by electromagnetic waves,

wherein the modulation is defined by a path on and between surfaces of a plurality of concentric orthogonal state spheres, and wherein the modulation is performed using the unique orbital angular momentum of the electromagnetic waves as a degree of freedom;

transmitting the modulated OFDM processed groups over the communications link in accordance with each of the different, unique orthogonal functions;

receiving the modulated OFDM processed groups over the communications link;

demodulating each of the received modulated OFDM processed groups in accordance with the unique orthogonal function defined by the path on and between surfaces of the plurality of concentric orthogonal state spheres;

separating the plurality of OFDM processed groups into the separate OFDM processed groups; and

removing the OFDM processing from each of the plurality of OFDM processed groups to provide the plurality of data streams.

14. The method of claim 13, wherein the step of transmitting further comprises transmitting the modulated OFDM processed groups over an RF communications link.

15. The method of claim 13, wherein the step of transmitting further comprises transmitting the modulated OFDM processed groups over an optical communications link.

16. The method of claim 13, wherein the step of applying orthogonal frequency division multiplexing (OFDM) processing further comprises the step of generating a plurality of grids of channel slots, each grid of the plurality of grids of channel slots defining a plurality of channel slots, each of the channel slots identified by an associated time and frequency.

17. The method of claim 16, wherein the step of modulating further comprises applying a different orthogonal function to each of the plurality of grids of channel slots.