Communicating Distinct Data Using Polarized Data Signals

• US 20110007758A1
• Filed: 07/07/2009
• Published: 01/13/2011
• Est. Priority Date: 07/07/2009
• Status: Active Grant

• Current Assignee: Nigel Iain Stuart Macrae
• Original Assignee: Nigel Iain Stuart Macrae
• Inventors: Macrae, Nigel Iain Stuart
• Granted Patent: US 7,957,425 B2
• Time in Patent Office: Days
• US Class Current: 370/480
• CPC Class Codes: H04B 7/10 Polarisation diversity; Directional diversity

Abstract

A method and system is provided for communicating distinct data over a single frequency using multiple polarized data signals. Data signals of the single frequency conveying first data, second data, and third data are polarized in a first polarization scheme and a second polarization scheme. The data signals comprise a first data signal, a second data signal, a third data signal, and inverse of the third data signal in a first configuration or a second configuration. The polarized data signals are transmitted from transmitting stations to one or more receiving stations. The first data, second data, and third data are obtained from the data signals received at the receiving stations using an antenna of a first polarity and an antenna of a second polarity. The amount of distinct data transmitted over the single frequency is increased by, for example, about 50% without causing interference between the data signals.

Claims

1. A method of communicating distinct data over a single frequency using polarized data signals, comprising the steps of:

providing data signals conveying first data, second data, and third data, wherein said data signals are of said single frequency;

polarizing said data signals in a first polarization scheme and a second polarization scheme, wherein said polarized data signals comprise a first data signal, a second data signal, a third data signal, and an inverse of said third data signal;

transmitting said third data signal and said inverse of said third data signal in said first polarization scheme from one transmitting station, and transmitting said first data signal and said second data signal in said second polarization scheme from one of said one transmitting station and other transmitting stations, to one or more receiving stations; and

receiving said transmitted data signals in said first polarization scheme and said second polarization scheme at said one or more receiving stations, wherein said first data, said second data, and said third data are obtained from said received data signals;

whereby amount of distinct data transmitted to said receiving stations over said single frequency is increased without causing interference between said data signals.

2. The method of claim 1, wherein said first data signal conveys said first data, said second data signal conveys said second data, and said third data signal and said inverse of said third data signal convey said third data.

3. The method of claim 1, wherein in a first configuration said first data signal and said second data signal are polarized in said first polarization scheme, and said third data signal and said inverse of said third data signal are polarized in said second polarization scheme, wherein said first polarization scheme is linear polarization and said second polarization scheme is circular polarization.

4. The method of claim 3, wherein in said first configuration one of said third data signal and said inverse of said third data signal are inverted and summed with other one of said inverse of said third data signal and said third data signal at an antenna of second polarity at said receiving stations for obtaining said third data at increased strength, and wherein said first data signal and said second data signal cancel each other out at said summation, wherein said antenna of said second polarity is an antenna of circular polarity.

5. The method of claim 3, wherein phase and level of said third data signal and said inverse of said third data signal polarized in said second polarization scheme are adjusted at transmission for enabling said third data signal and said inverse of said third data signal to cancel each other out at an antenna of first polarity at said receiving stations, wherein said antenna of first polarity is an antenna of linear polarity.

6. The method of claim 1, wherein in a second configuration said third data signal and said inverse of said third data signal are polarized in said first polarization scheme, and said first data signal and said second data signal are polarized in said second polarization scheme, wherein said first polarization scheme is linear polarization and said second polarization scheme is circular polarization.

7. The method of claim 6, wherein in said second configuration one of said third data signal and said inverse of said third data signal is inverted and summed with other one of said inverse of said third data signal and said third data signal at an antenna of first polarity at said receiving stations for obtaining said third data at increased strength, and wherein said first data signal and said second data signal cancel each other out at said summation, and wherein said antenna of first polarity is an antenna of linear polarity.

8. The method of claim 6, wherein phase and level of said third data signal and said inverse of said third data signal polarized in said first polarization scheme are adjusted at transmission for enabling said third data signal and said inverse of said third data signal to cancel each other out at reception at an antenna of second polarity at said receiving stations, wherein said antenna of said second polarity is an antenna of circular polarity.

9. The method of claim 1, wherein said data signals polarized in said first polarization scheme comprise two polarized data signals inverse to each other, wherein said first polarization scheme is linear polarization.

10. The method of claim 1, wherein said data signals polarized in said second polarization scheme comprise two polarized data signals inverse to each other, wherein said second polarization scheme is circular polarization.

11. The method of claim 1, wherein said first data signal and said second data signal are transmitted from one of a single transmitting station and a plurality of said transmitting stations and are received at one of a single receiving station and a plurality of said receiving stations.

12. The method of claim 1, wherein said third data signal and said inverse of said third data signal are transmitted from one of said transmitting stations and received together at a same antenna at one of said receiving stations for enabling said third data signal and said inverse of said third data signal to cancel each other out when received together at said same antenna.

13. The method of claim 1, wherein said first data and said second data are same.

14. The method of claim 1, further comprising the steps of:

transmitting said third data signal in a polarization scheme and transmitting inverse of said third data signal in an opposite polarity of said polarization scheme;

receiving said third data signal in said polarization scheme and said inverse of said third data signal in said opposite polarity of said polarization scheme at an antenna;

inverting one of said third data signal in said polarization scheme and said inverse of said third data signal in said opposite polarity of said polarization scheme, and summing said inverted one of said third data signal and said inverse of said third data signal to other one of said third data signal and said inverse of said third data signal; and

transmitting said first data signal and said second data signal using a different polarization scheme.

15. A method of communicating distinct data over a single frequency using a plurality of polarized data signals, comprising the steps of:

providing a plurality of data signals conveying first data, second data, and third data, wherein said data signals are of said single frequency;

polarizing said data signals in a first polarization scheme and a second polarization scheme, wherein said polarized data signals comprise a first set of polarized data signals in a first polarization scheme and a second set of polarized data signals in a second polarization scheme, wherein said first set of polarized data signals comprises a first data signal and a second data signal, wherein said second set of polarized data signals comprises two identical carrier signals, wherein each of said identical carrier signals carries a data signal 180 degrees opposite to each other;

transmitting said polarized data signals from one or more transmitting stations to each of one or more receiving stations; and

receiving said transmitted data signals in said first polarization scheme and said second polarization scheme at said one or more receiving stations, wherein said first data, said second data, and said third data are obtained from said received data signals;

whereby amount of distinct data transmitted to said one or more receiving stations over said single frequency is increased without causing interference between said data signals.

16. The method of claim 15, wherein two polarized signals are transmitted on two different polarities of a single polarization scheme from a same antenna, wherein said two polarized signals are:

a first signal comprising a carrier signal and a data signal; and

a second signal comprising a carrier signal and an inverse of said data signal.

17. The method of claim 16, wherein signals other than said two of said polarized signals have a guard band falling exactly on frequency of carrier signal of each of said other signals.

18. A system for communicating distinct data over a single frequency using a plurality of polarized data signals, comprising:

a data source for providing a plurality of data signals conveying first data, second data, and third data, wherein said data signals are of said single frequency;

a polarizer for polarizing each of said data signals in a first polarization scheme and a second polarization scheme, wherein said polarized data signals comprise a first data signal, a second data signal, a third data signal, and an inverse of said third data signal;

one or more transmitting stations for transmitting said polarized data signals to one or more receiving stations, wherein said third data signal and said inverse of said third data signal is transmitted from one of said transmitting stations in said first polarization scheme, and wherein said first data signal is transmitted from one of said one of said transmitting stations and other of said transmitting stations in said second polarization scheme, and wherein said second data signal is transmitted from one of said one of said transmitting stations and other of said transmitting stations; and

said receiving stations comprising antennas of a first polarity and of a second polarity for receiving said transmitted data signals, wherein said first data, said second data, and said third data are obtained from said received data signals.

19. The system of claim 18, wherein at least one of said receiving stations receives said third data signal in one polarity of a polarization scheme and said inverse of said third data signal in an opposite polarity of said polarization scheme, inverts one of said third data signal received in said one polarity and said inverse of said third data signal received in said opposite polarity, and sums said inverted one of said third data signal and said inverse of said third data signal with other one of said third data signal in said one polarity and said inverse of third data signal from said opposite polarity of said polarization scheme.