Method and system for digital cancellation scheme with multi-beam

• US 9,100,968 B2
• Filed: 05/09/2014
• Issued: 08/04/2015
• Est. Priority Date: 05/09/2013
• Status: Active Grant

• Current Assignee: Magnolia Broadband Incorporated
• Original Assignee: Magnolia Broadband Incorporated
• Inventors: Rivingston, Thorp, Harel, Haim, Kludt, Kenneth, Chen, Phil F., Jeffery, Stuart S.
• Primary Examiner(s): PHAN, MAN U
• Application Number:
  US14/273,866
• Publication Number:
  US 20140334312A1
• Time in Patent Office: 452 Days
• Field of Search: 370200-241, 370252-338, 370389-395, 375260-267, 375347-349
• US Class Current: 1/1
• CPC Class Codes: H04B 7/04 using two or more spaced independent antennas
• CPC Class Codes: H04B 7/0408 using two or more beams, i.e. beam diversity
• CPC Class Codes: H04B 7/0491 using two or more sectors, i.e. sector diversity
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 24/08 Testing, supervising or monitoring using real traffic
• CPC Class Codes: H04W 74/0816 with collision avoidance

Abstract

A method and system may include a plurality of collocated access points (APs), each coupled to, and operating independently with, a respective set of antennas, wherein the antennas are directional and oriented to create beams that cover different directions, for dividing a coverage of the APs into a plurality of subsectors, wherein the antennas further comprise transmit antennas and receive antennas separated from each other, wherein the APs operate with a limited number of channels, wherein two or more of the subsectors share a common channel, wherein the APs are configured to initiate a transmission by employing collision sense multiple access/collision avoidance (CSMA/CA), wherein the antennas are configured to enable simultaneous operation of each of the subsectors without impairing operation of the others, and wherein a radio frequency (RF) energy reception between the transmit antennas and the receive antennas is configured to prevent independent subsector operation because of the CSMA/CA.

Claims

1. A system comprising:

a plurality of collocated access points (APs), each coupled to, and operating independently with, a respective set of antennas,

wherein the antennas are directional and oriented to create beams that cover different directions, for dividing a coverage of the APs into a plurality of subsectors,

wherein the antennas further comprise transmit antennas and receive antennas separated from each other,

wherein the APs operate with a limited number of channels,

wherein two or more of the subsectors share a common channel,

wherein the APs are configured to initiate a transmission by employing collision sense multiple access/collision avoidance (CSMA/CA),

wherein the antennas are configured to enable simultaneous operation of each of the subsectors without impairing operation of the others, and

wherein a radio frequency (RF) energy reception between the transmit antennas and the receive antennas is configured to prevent independent subsector operation because of the CSMA/CA,

further comprising a sampler configured to sample an RF signal being radiated by each antenna for each of the APs, and an analog to digital converter configured to convert the sampled RF signals into sampled digital signals,

wherein the received RF energy is reduced by combining the received transmitted RF energy with the sampled digital signals, to allow simultaneous operation of the APs.

2. The system according to claim 1, wherein the limited number of channels comply with IEEE 802.11 standards.

3. The system according to claim 1, wherein the combining of signals is carried out by applying a finite impulse response (FIR) filter at a baseband processor of the APs.

4. The system according to claim 1, wherein the antennas are implemented as a multi-beam antenna array.

5. A method comprising:

providing a plurality of collocated access points (APs), each coupled to, and operating independently with, a respective set of antennas, wherein the antennas further comprise transmit antennas and receive antennas separated from each other;

directing and orienting the antennas to create beams that cover different directions, for dividing a coverage of the APs into a plurality of subsectors, wherein the APs operate with a limited number of channels, wherein two or more of the subsectors share a common channel;

initiating a transmission by employing collision sense multiple access/collision avoidance (CSMA/CA);

enabling simultaneous operation of each of the subsectors without impairing operation of the others; and

monitoring a radio frequency (RF) energy reception between the transmit antennas and the receive antennas to prevent independent subsector operation because of the CSMA/CA,

further comprising sampling an RF signal being radiated by each antenna for each of the APs,

converting the sampled RF signals into sampled digital signals,

combining the received RF energy with the sampled digital signals to allow simultaneous operation of the APs and to reduce the received RF energy.

6. The method according to claim 5, wherein the limited number of channels comply with IEEE 802.11 standards.

7. The method according to claim 5, wherein the combining of signals is carried out by applying a finite impulse response (FIR) filter.

8. The method according to claim 5, wherein the antennas are implemented as a multi-beam antenna array.

9. A non-transitory computer readable storage medium having computer readable instructions stored thereon, the instructions when executed by a processor causing the processor to:

direct and orientate a plurality of antennas to create beams that cover different directions, for dividing a coverage of the APs into a plurality of subsectors, wherein the APs operate with a limited number of channels, wherein two or more of the subsectors share a common channel;

initiate a transmission by employing collision sense multiple access/collision avoidance (CSMA/CA);

enable simultaneous operation of each of the subsectors without impairing operation of the others; and

monitor a radio frequency (RF) energy reception between the transmit antennas and the receive antennas to prevent independent subsector operation because of the CSMA/CA,

wherein the instructions cause the processor to sample an RF signal being radiated by each antenna for each of the APs and convert the sampled RF signals into digital signals, and

wherein the instructions cause the processor to combine the received RF energy with the sampled digital signals to allow simultaneous operation of the APs and to reduce the received transmitted RF energy.

10. The computer readable storage medium according to claim 9, wherein the limited number of channels comply with IEEE 802.11 standards.

11. The computer readable storage medium according to claim 9, wherein the combining of signals is carried out by applying a finite impulse response (FIR) filter.