Simultaneous bidirectional transmission for radio systems

• US 9,025,500 B2
• Filed: 07/24/2013
• Issued: 05/05/2015
• Est. Priority Date: 07/26/2012
• Status: Expired due to Fees

• Current Assignee: REMEC Broadband Wireless Networks LLC (Moseley Associates, Inc.)
• Original Assignee: Remec Broadband Wireless LLC (Moseley Associates, Inc.)
• Inventors: Bowman, Charles, Moeenziai, Behzad
• Primary Examiner(s): Chriss, Andrew
• Assistant Examiner(s): Kading, Joshua A
• Application Number:
  US13/950,112
• Publication Number:
  US 20140029482A1
• Time in Patent Office: 650 Days
• Field of Search: None
• US Class Current: 370/278
• CPC Class Codes: H04B 1/50 using different frequencies for the two directions of communication
• CPC Class Codes: H04B 15/00 Suppression or limitation of noise or interference by means associated with receiver H04B1/10
• CPC Class Codes: H04L 5/1461 Suppression of signals in the return path, i.e. bidirectional control circuits

Abstract

Disclosed are methods, systems, and apparatus for maximizing the spectral efficiency of a communications spectrum by providing a means to transmit information continuously in both directions of a radio link on the same center frequency at any given time. One embodiment may be directed to a method of communicating in a point-to-point radio system. The method may include receiving a first signal at a first antenna of a radio head. The first signal may include a transmitted data signal and interfering signals. The method continues by determining a correction signal from a transmitter of the radio head and processing the first signal to remove the interfering signals using the correction signal, and sending a second signal using a second antenna. The first and second signals may be sent and received at substantially the same time.

Claims

1. A method of communicating between first and second radio heads of a line-of-sight point-to-point radio communications link,

wherein the first radio head comprises:

a first transmitter,

a first receiver,

a first processor,

a first directional antenna connected to the first transmitter, and

a second directional antenna connected to the first receiver,

wherein the second radio head comprises;

a second transmitter,

a second receiver,

a second processor,

a third directional antenna connected to the second transmitter, and

a fourth directional antenna connected to the second receiver,

wherein the first and second radio heads are at first and second respective fixed radio head locations with a direct line of sight between the first and second radio head locations,

wherein the radio communications link comprises a first data path from the first radio head to the second radio head and a second data path from the second radio head to the first radio head,

wherein the method comprises;

transmitting a first signal from the first transmitter via the first antenna;

receiving the first signal at the second receiver via the fourth antenna;

transmitting a second signal from the second transmitter via the third antenna;

receiving the second signal at the first receiver via the second antenna,

with the first and second directional antennas, isolating the first and second signals from one another such that;

a) damage or degradation of the first receiver by the first signal is prevented, and

b) the first receiver and the first processor are collectively configured to recover the second signal; and

with the third and fourth directional antennas, isolating the first and second signals from one another such that;

a) damage or degradation of the second receiver by the second signal is prevented, and

b) the second receiver and the second processor are collectively configured to recover the first signal,

wherein the first and second signals are both in a same allocated frequency band, and

wherein the first and second signals are independent of one another and are transmitted in opposite directions of the communications link,

wherein;

the radio communications link comprises a third data path from the first radio head to the second radio head and a fourth data path from the second radio head to the first radio head,

wherein the first radio head further comprises;

a third transmitter,

a third receiver,

a fifth directional antenna connected to the third transmitter, and

a sixth directional antenna connected to the third receiver,

and wherein the second radio head further comprises;

a fourth transmitter,

a fourth receiver,

a seventh directional antenna connected to the fourth transmitter, and

an eighth directional antenna connected to the fourth receiver,

wherein the method further comprises;

transmitting a third signal from the third transmitter via the fifth antenna;

receiving the third signal at the fourth receiver via the eighth antenna;

transmitting a fourth signal from the fourth transmitter via the seventh antenna;

receiving the fourth signal at the third receiver via the sixth antenna,

with the fifth and sixth directional antennas, isolating the third and fourth signals from one another such that;

a) damage or degradation of the third receiver by the third signal is prevented, and

b) the third receiver and the first processor are collectively configured to recover the fourth signal; and

with the seventh and eighth directional antennas, isolating the third and fourth signals from one another such that;

a) damage or degradation of the fourth receiver by the fourth signal is prevented, and

b) the fourth receiver and the second processor are collectively configured to recover the third signal, and

wherein the first, second, third, and fourth signals are all in a same allocated frequency band,

wherein the first, second, third, and fourth signals are at the same center frequency, and wherein a transmission radiation polarity for the first and second signals is the same and is orthogonal to a transmission radiation polarity for the third and fourth signals,

wherein bandwidths of the third and fourth signals are at the same center frequency, a portion of the third signal is received by the sixth antenna, and a portion of the fourth signal is received by the eighth antenna, and wherein the method further comprises;

with a third processor, determining a third correction signal based on the third signal;

with the third processor, based on the third correction signal, reducing the received portion of the third signal component from the fourth signal;

with a fourth processor, determining a fourth correction signal based on the fourth signal; and

with the fourth processor, based on the fourth correction signal, reducing the received portion of the fourth signal component from the third signal.

2. The method of claim 1, wherein the first antenna and the second antenna include one or more of a lens horn, a waveguide slot array, a continuous transverse stub array, or a trough guide array.

3. The method of claim 1, wherein the first antenna and the second antenna are high isolation antennas.

4. The method of claim 1, wherein the first and second signals are transmitted at substantially the same time.

5. A method of communicating between first and second radio heads of a line-of-sight point-to-point radio communications link,

wherein the first radio head comprises:

a first transmitter,

a first receiver,

a first processor,

a first directional antenna connected to the first transmitter, and

a second directional antenna connected to the first receiver,

wherein the second radio head comprises;

a second transmitter,

a second receiver,

a second processor,

a third directional antenna connected to the second transmitter, and

a fourth directional antenna connected to the second receiver,

wherein the first and second radio heads are at first and second respective fixed radio head locations with a direct line of sight between the first and second radio head locations,

wherein the radio communications link comprises a first data path from the first radio head to the second radio head and a second data path from the second radio head to the first radio head,

wherein the method comprises;

transmitting a first signal from the first transmitter via the first antenna;

receiving the first signal at the second receiver via the fourth antenna;

transmitting a second signal from the second transmitter via the third antenna;

receiving the second signal at the first receiver via the second antenna,

with the first and second directional antennas, isolating the first and second signals from one another such that;

a) damage or degradation of the first receiver by the first signal is prevented, and

b) the first receiver and the first processor are collectively configured to recover the second signal; and

with the third and fourth directional antennas, isolating the first and second signals from one another such that;

a) damage or degradation of the second receiver by the second signal is prevented, and

b) the second receiver and the second processor are collectively configured to recover the first signal,

wherein the first and second signals are both in a same allocated frequency band, and

wherein the first and second signals are independent of one another and are transmitted in opposite directions of the communications link,

wherein bandwidths of the first and second signals are at the same center frequency, a portion of the first signal is received by the second antenna, and a portion of the second signal is received by the fourth antenna, and wherein the method further comprises;

with the first processor, determining a first correction signal based on the first signal;

with the first processor, based on the first correction signal, reducing the received portion of the first signal component from the second signal;

with the second processor, determining a second correction signal based on the second signal; and

with the second processor, based on the second correction signal, reducing the received portion of the second signal component from the first signal.

6. The method of claim 5, wherein the first antenna and the second antenna include one or more of a lens horn, a waveguide slot array, a continuous transverse stub array, or a trough guide array.

7. The method of claim 5, wherein the first antenna and the second antenna are high isolation antennas.

8. The method of claim 5, wherein the first and second signals are transmitted at substantially the same time.

9. The method of claim 5, wherein:

the radio communications link comprises a third data path from the first radio head to the second radio head and a fourth data path from the second radio head to the first radio head,

wherein the first radio head further comprises;

a third transmitter,

a third receiver,

a fifth directional antenna connected to the third transmitter, and

a sixth directional antenna connected to the third receiver,

and wherein the second radio head further comprises;

a fourth transmitter,

a fourth receiver,

a seventh directional antenna connected to the fourth transmitter, and

an eighth directional antenna connected to the fourth receiver,

wherein the method further comprises;

transmitting a third signal from the third transmitter via the fifth antenna;

receiving the third signal at the fourth receiver via the eighth antenna;

transmitting a fourth signal from the fourth transmitter via the seventh antenna;

receiving the fourth signal at the third receiver via the sixth antenna,

with the fifth and sixth directional antennas, isolating the third and fourth signals from one another such that;

a) damage or degradation of the third receiver by the third signal is prevented, and

b) the third receiver and the first processor are collectively configured to recover the fourth signal; and

with the seventh and eighth directional antennas, isolating the third and fourth signals from one another such that;

a) damage or degradation of the fourth receiver by the fourth signal is prevented, and

b) the fourth receiver and the second processor are collectively configured to recover the third signal, and

wherein the first, second, third, and fourth signals are all in a same allocated frequency band.

10. The method of claim 9, wherein the first, second, third, and fourth signals are at the same center frequency, and wherein a transmission radiation polarity for the first and second signals is the same and is orthogonal to a transmission radiation polarity for the third and fourth signals.