Polarization diversity with portable devices via wavefront muxing techniques

• US 10,116,409 B2
• Filed: 06/01/2015
• Issued: 10/30/2018
• Est. Priority Date: 07/30/2010
• Status: Active Grant

• Current Assignee: Spatial Digital Systems Inc
• Original Assignee: Spatial Digital Systems Inc
• Inventors: Chang, Donald C. D.
• Primary Examiner(s): Daya, Tejis
• Application Number:
  US14/726,662
• Publication Number:
  US 20150263820A1
• Time in Patent Office: 1,247 Days
• CPC Class Codes: H04B 7/10 Polarisation diversity; Directional diversity
• CPC Class Codes: H04B 7/185 Space-based or airborne stations; Stations for satellite systemsH04B7/204 takes precedence
• CPC Class Codes: H04J 14/06 Polarisation multiplex systems
• CPC Class Codes: H04L 27/26 Systems using multi-frequency codes H04L27/32 takes precedence
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames

Abstract

A novel terrestrial wireless communications technique for terrestrial portable terminals including hand-held mobile devices and fixed wireless instruments, utilizing a spoke-and-hub communications system, having a plurality of individual hubs and/or base-stations all in communications with the portable terminals. The portable terminals and the hubs are assigned to use incompatible polarity formats in terms of circularly polarity (CP) and linearly polarity (LP). In forward links, a signal processed by the LP ground telecommunications hubs is radiated through multiple antennas with various LP polarities to an individual CP user simultaneously. The multiple paths are organized via assignments of a plurality of polarities, frequency slots, and directions by wavefront multiplexing/demultiplexing techniques such that the same communications assets including frequency spectrum may be re-used by other users. The same polarity diversity methods can be extended to peer-to-peer communications.

Claims

1. A system comprising:

N antennas to receive N input wireless signals that occupy channels configured for at least two different instances of a first polarization, N being an integer greater than 1; and

N wavefront multiplexing (WFM) processors configured to operate on the N received input wireless signals to produce N output signals using a conversion matrix such that the N output signals correspond to a second polarization different from the first polarization,

wherein each of the N processors calculates a corresponding one of the N output signals as a linear combination of the N received input wireless signals using a row in the conversion matrix.

2. The system of claim 1, wherein the first polarization is one of a circular polarization and a linear polarization.

3. The system of claim 1, wherein the second polarization is one of a circular polarization and a linear polarization.

4. The system of claim 1, wherein the two different instances of the first polarization are a right-hand circular polarization (RHCP) and a left-hand circular polarization (LHCP).

5. The system of claim 1, wherein the conversion matrix has coefficients that correspond to at least one of a polarization conversion and a frequency conversion.

6. The system of claim 1, wherein the N output signals are processed in two different instances of the second polarization.

7. The system of claim 6, wherein the two different instances of the second polarization are a vertical polarization and a horizontal polarization.

8. The system of claim 6, wherein N =4.

9. The system of claim 8, wherein the N input wireless signals occupy two RHCP channels at first and second frequencies.

10. The system of claim 9, wherein the N input wireless signals include first, second, third, and fourth input wireless signals occupying two LHCP, RHCP, and two LHCP, RHCP channels, respectively, at the first and second frequencies and carrying the first, second, third, and fourth input wireless signals, respectively.

11. The system of claim 1, wherein the channels are wireless.

12. The system of claim 1, wherein the N WFM processors are located in N receiving stations.

13. A system for wireless communications comprising:

N terminals configured to operate in a first polarization to transmit N data streams that occupy channels configured for at least two different instances of the first polarization, N being an integer greater than 1; and

a hub configured to process the N data streams in a second polarization different from the first polarization, the hub comprising;

N antennas to receive the N data streams as N input wireless signals; and

N wavefront multiplexing (WFM) processors configured to operate on the N received input wireless signals to produce N output signals using a conversion matrix such that the N output signals correspond to the second polarization,

wherein each of the N processors calculates a corresponding one of the N output signals as a linear combination of the N received input wireless signals using a row in the conversion matrix.

14. The system of claim 13, wherein the first polarization is one of a circular polarization and a linear polarization.

15. The system of claim 13, wherein the second polarization is one of a circular polarization and a linear polarization.

16. The system of claim 13, wherein the two different instances of the first polarization are a right-hand circular polarization (RHCP) and a left-hand circular polarization (LHCP).

17. The system of claim 13, wherein the conversion matrix has coefficients that correspond to at least one of a polarization conversion and a frequency conversion.

18. The system of claim 13, wherein N =4.

19. The system of claim 18, wherein the two different instances of the second polarization are a vertical polarization and a horizontal polarization.

20. The system of claim 16, wherein the N data streams occupy two RHCP channels at first and second frequencies.