Systems/methods of spectrally efficient communications

• US 9,806,790 B2
• Filed: 08/08/2014
• Issued: 10/31/2017
• Est. Priority Date: 03/29/2010
• Status: Active Grant

• Current Assignee: Odyssey Wireless, Inc.
• Original Assignee: Odyssey Wireless, Inc.
• Inventors: Karabinis, Peter D.
• Primary Examiner(s): Orgad, Edan
• Assistant Examiner(s): COSTIN, JEREMY M
• Application Number:
  US14/455,069
• Publication Number:
  US 20140348114A1
• Time in Patent Office: 1,180 Days
• CPC Class Codes: H04B 7/12 Frequency diversity
• CPC Class Codes: H04L 2025/03414 Multicarrier
• CPC Class Codes: H04L 25/0204 of multiple channels
• CPC Class Codes: H04L 25/0224 using sounding signals
• CPC Class Codes: H04L 25/03006 Arrangements for removing intersymbol interference
• CPC Class Codes: H04L 25/03343 Arrangements at the transmitter end
• CPC Class Codes: H04L 27/2628 Inverse Fourier transform modulators, e.g. inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators H04L27/2634 takes precedence
• CPC Class Codes: H04L 27/2647 Arrangements specific to the receiver only equalisation H04L27/01
• CPC Class Codes: H04L 27/265 Fourier transform demodulators, e.g. fast Fourier transform [FFT] or discrete Fourier transform [DFT] demodulators H04L27/26524 takes precedence
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/006 Quality of the received signal, e.g. BER, SNR, water filling

Abstract

First and second receivers are used to receive respective first and second signals, to process said first and second signals and provide respective first and second measures thereof to respective first and second transmitters. The first and second transmitters are configured to launch the first and second measures, respectively, each comprising a desired component that has originated at a desired source, and an interference component that has originated at an interfering source. The first and/or second transmitters are configured to process and launch the respective first and second measures, properly conditioned, so that upon interception thereof by a receiving element the interference components thereof add destructively and substantially cancel (or at least partially cancel) each other, whereas the desired components avoid substantial cancellation owing to a phase relationship therebetween that differs relative to a phase relationship between the interference components.

Claims

1. A communications method comprising:

receiving by a first wireless receiver a first electromagnetic signal that comprises a combination of a desired component that is related to a desired signal and an interference component that is related to an interference signal, wherein each one of the desired signal and the interference signal are transmitted using a common set of frequencies by respective first and second physically distinct sources;

frequency shifting said first electromagnetic signal that is received by said first wireless receiver from frequencies at which the first electromagnetic signal is received at the first wireless receiver to frequencies that are mutually exclusive to said frequencies at which the first electromagnetic signal is received at the first wireless receiver;

providing said first electromagnetic signal that is received by said first wireless receiver and is frequency shifted to a first wireless transmitter;

transmitting by said first wireless transmitter said first electromagnetic signal that is frequency shifted;

receiving by a second wireless receiver a second electromagnetic signal that comprises a combination of a desired component that is related to said desired signal and an interference component that is related to said interference signal;

frequency shifting said second electromagnetic signal that is received by said second wireless receiver from frequencies at which the second electromagnetic signal is received at the second wireless receiver to frequencies that are mutually exclusive to said frequencies at which the second electromagnetic signal is received at the second wireless receiver;

processing the second electromagnetic signal that is received by the second wireless receiver and is frequency shifted;

providing said second electromagnetic signal that is received by said second wireless receiver following said frequency shifting and processing thereof to a second wireless transmitter;

transmitting by the second wireless transmitter the second electromagnetic signal that has been frequency shifted and processed; and

concurrently wirelessly receiving at a receiving element the first electromagnetic signal that has been frequency shifted and transmitted by said first wireless transmitter and the second electromagnetic signal that has been frequency shifted and processed and transmitted by said second wireless transmitter so that respective components thereof that are related to the interference signal at least partially cancel one another upon reception at the receiving element at the frequencies of reception by the receiving element;

wherein said processing the second electromagnetic signal that is received by the second wireless receiver comprises altering a phase thereof.

2. The communications method according to claim 1, wherein said processing the second electromagnetic signal that is received by the second receiver further comprises:

transforming using a Fourier transformation and inverse transforming using an inverse Fourier transformation.

3. The communications method according to claim 1, wherein said frequency shifting comprises:

frequency shifting from a cellular band of frequencies to a band of frequencies outside of the cellular band of frequencies.

4. The communications method according to claim 1, further comprising:

receiving at each one of the first and second wireless receivers first and second measures of respective first and second desired signals, that are generated by respective first and second desired sources that are physically distinct and independent of one another;

the first and second desired sources using respective first and second mutually exclusive frequencies to generate the first and second desired signals, respectively;

receiving, at each one of the first and second wireless receivers first and second measures of respective first and second interference signals, that are generated by respective first and second interference sources that are physically distinct and independent of one another, concurrently with said receiving the first and second desired signals;

the first and second interference sources using the first and second mutually exclusive frequencies to generate the first and second interference signals, respectively; and

commanding the second interference source to use the first frequencies in generating the second interference signal responsive to a phase measurement.

5. The method of claim 1, wherein the first and second electromagnetic signals are transmitted so that the respective components thereof that are related to the interference signal at least partially destructively add together upon reception at the receiving element.

6. The method of claim 1, wherein the first and second electromagnetic signals are transmitted so that the respective components thereof that are related to the interference signal destructively add together upon reception at the receiving element to a greater extent than an extent, if any, to which the respective components thereof that are related to the desired signal destructively add together upon reception at the receiving element.

7. A communications system configured to perform operations comprising:

receiving by a first wireless receiver a first electromagnetic signal that comprises a combination of a desired component that is related to a desired signal and an interference component that is related to an interference signal;

wherein each one of the desired signal and the interference signal are transmitted using a common set of frequencies by respective first and second physically distinct sources;

frequency shifting said first electromagnetic signal that is received by said first wireless receiver from frequencies at which the first electromagnetic signal is received at the first wireless receiver to frequencies that are mutually exclusive to said frequencies at which the first electromagnetic signal is received at the first wireless receiver;

providing said first electromagnetic signal that is received by said first wireless receiver and is frequency shifted to a first wireless transmitter;

transmitting by said first wireless transmitter said first electromagnetic signal that is frequency shifted;

receiving by a second wireless receiver a second electromagnetic signal that comprises a combination of a desired component that is related to said desired signal and an interference component that is related to said interference signal;

frequency shifting said second electromagnetic signal that is received by said second wireless receiver from frequencies at which the second electromagnetic signal is received at the second wireless receiver to frequencies that are mutually exclusive to said frequencies at which the second electromagnetic signal is received at the second wireless receiver;

processing the second electromagnetic signal that is received by the second wireless receiver and is frequency shifted;

providing said second electromagnetic signal that is received by said second wireless receiver and is frequency shifted and processed to a second wireless transmitter;

transmitting by the second wireless transmitter the second electromagnetic signal that has been frequency shifted and processed; and

concurrently wirelessly receiving at a receiving element the first electromagnetic signal that has been frequency shifted and transmitted by said first wireless transmitter and the second electromagnetic signal that has been frequency shifted and processed and transmitted by said second wireless transmitter so that respective components thereof that are related to the interference signal at least partially cancel one another upon reception at the receiving element at the frequencies of reception by the receiving element;

wherein said processing the second electromagnetic signal that is received by the second wireless receiver comprises altering a phase thereof.

8. The communications system according to claim 7, wherein said processing the second electromagnetic signal that is received by the second wireless receiver further comprises altering an amplitude thereof.

9. The communications system according to claim 7, wherein

said frequency shifting comprises frequency shifting from a cellular band of frequencies to a band of frequencies outside of the cellular band of frequencies.

10. The communications system according to claim 9, wherein said band of frequencies outside of the cellular band of frequencies comprises one or more of:

optical frequencies, infrared frequencies and ultraviolet frequencies.

11. The communications system according to claim 7, wherein said operations further comprise:

receiving at each one of the first and second wireless receivers first and second measures of respective first and second desired signals, that are generated by respective first and second desired sources that are physically distinct and independent of one another;

the first and second desired sources using respective first and second mutually exclusive frequencies to generate the first and second desired signals, respectively;

receiving, at each one of the first and second wireless receivers first and second measures of respective first and second interference signals, that are generated by respective first and second interference sources that are physically distinct and independent of one another, concurrently with said receiving the first and second desired signals;

the first and second interference sources using the first and second mutually exclusive frequencies to generate the first and second interference signals, respectively; and

commanding the second interference source to use the first frequencies in generating the second interference signal responsive to a phase measurement.