SYSTEMS/METHODS OF SPECTRALLY EFFICIENT COMMUNICATIONS

• US 20140348114A1
• Filed: 08/08/2014
• Published: 11/27/2014
• Est. Priority Date: 03/29/2010
• Status: Active Grant

• Current Assignee: Odyssey Wireless, Inc.
• Original Assignee: Odyssey Wireless, Inc.
• Inventors: KARABINIS, Peter D.
• Granted Patent: US 9,806,790 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• 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:

transmitting by a first wireless transmitter a first signal that comprises a desired component that is related to a desired signal and an interference component that is related to an interference signal;

the desired signal and the interference signal being generated by respective physically distinct desired and interfering sources that are independent of one another;

transmitting by a second wireless transmitter a second signal that comprises a desired component that is related to the desired signal and an interference component that is related to the interference signal; and

concurrently wirelessly receiving at a receiving element the first and second signals, so that respective components thereof that are related to the interference signal at least partially cancel one another at the receiving element.

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

receiving by a first wireless receiver, that is connected to the first wireless transmitter, a measure of the desired signal and a measure of the interference signal;

receiving by a second wireless receiver, that is connected to the second wireless transmitter, a measure of the desired signal and a measure of the interference signal; and

processing the measure of the desired signal and the measure of the interference signal that are received by the second wireless receiver to generate the second signal.

3. The communications method according to claim 1, wherein the desired signal comprises N≧

2 subcarriers and the interference signal comprises M≧

2 subcarriers, the method further comprising;

wirelessly transmitting, using a set of frequencies, the N subcarriers to/from a first device that is being served by a sector of a base station; and

wirelessly transmitting, concurrently with said wirelessly transmitting the N subcarriers, the M subcarriers to/from a second device that is being served by the sector of the base station using at least some frequencies of the set of frequencies.

4. The communications method according to claim 2, wherein said processing comprises:

frequency shifting and phase adjusting.

5. The communications method according to claim 4, wherein said processing further comprises:

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

6. The communications method according to claim 4, 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.

7. The communications method according to claim 6, wherein said transmitting by the second wireless transmitter a second signal comprises:

transmitting by the second wireless transmitter the second signal using frequencies of said band of frequencies outside of the cellular band of frequencies.

8. The communications method according to claim 2, 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 frequency in generating the second interference signal responsive to a phase measurement.

9. A communications system comprising:

a first receiver that is configured to receive a measure of a desired signal and a measure of an interference signal;

a second receiver that is configured to receive a measure of the desired signal and a measure of the interference signal;

a first transmitter that is connected to the first receiver and is configured to form and transmit a first signal that is related to the desired signal and interference signal; and

a second transmitter that is connected to the second receiver and is configured to form and transmit a second signal that is related to the desired signal and interference signal;

wherein the first and second transmitters are configured to transmit the respective first and second signals so that respective components thereof that are related to the interference signal at least partially cancel one another at a receiving element.

10. The communications system according to claim 9, wherein the first receiver comprises a wireless receiver and the second receiver comprises a wireless receiver.

11. The communications system according to claim 9, wherein the desired signal comprises N≧

2 subcarriers and the interference signal comprises M≧

2 subcarriers;

wherein a subcarrier n of the N subcarriers of the desired signal, 1≦

n≦

N, received by the first receiver, differs in amplitude and/or phase from the same subcarrier received by the second receiver; and

wherein a subcarrier m of the M subcarriers of the interference signal, 1≦

m≦

M, received by the first receiver, differs in amplitude and/or phase from the same subcarrier received by the second receiver.

12. The communications system according to claim 9, wherein the first transmitter that is connected to the first receiver and is configured to form and transmit the first signal, comprises a wireless transmitter that is configured to form and transmit said first signal and is further configured to frequency shift the measure of the desired signal and the measure of the interference signal that are received by the first receiver;

and wherein the second transmitter that is connected to the second receiver and is configured to form and transmit the second signal comprises a wireless transmitter that is configured to form and transmit said second signal and is further configured to frequency shift and phase adjust the measure of the desired signal and the measure of the interference signal that are received by the second receiver.

13. The communications system according to claim 12, wherein the second transmitter is further configured to amplitude adjust the measure of the desired signal and the measure of the interference signal that are received by the second receiver.

14. The communications system according to claim 12, wherein each one of the first and second transmitters is further configured to:

frequency shift the measure of the desired signal and the measure of the interference signal that are received by the respective receiver connected thereto from a cellular band of frequencies, at which the measure of the desired signal and the measure of the interference signal are received at the first receiver and at the second receiver, to a band of frequencies outside of the cellular band of frequencies.

15. The communications system according to claim 14, wherein the first transmitter is configured to transmit a frequency shifted measure of the desired signal and a frequency shifted measure of the interference signal and the second transmitter is configured to transmit a frequency shifted and phase adjusted measure of the desired signal and a frequency shifted and phase adjusted measure of the interference signal so that at the receiving element components thereof relating to interference add substantially destructively therebetween.

16. The communications system according to claim 14, wherein said band of frequencies outside of the cellular band of frequencies comprises optical frequencies, infrared frequencies and/or ultraviolet frequencies.

17. The communications system according to claim 9, wherein each one of the first and second receivers is configured to:

receive 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 therebetween;

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

receive 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 therebetween, concurrently with 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

wherein the system further comprises a processor that is configured to command the second interference source to use the first frequency in generating the second interference signal responsive to a phase measurement.