Methods Circuits Systems and Associated Computer Executable Code for Performing Beamforming Based Wireless Communication

• US 20150124713A1
• Filed: 08/16/2012
• Published: 05/07/2015
• Est. Priority Date: 08/16/2011
• Status: Abandoned Application

• Current Assignee: Gonet Systems Ltd.
• Original Assignee: Gonet Systems Ltd.
• Inventors: Salhov, Moshe, Kinamon, Roy
• Application Number:
  US14/238,737
• Publication Number:
  US 20150124713A1
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H01Q 3/2605 Array of radiating elements provided with a feedback control over the element weights, e.g. adaptive arrays
• CPC Class Codes: H01Q 3/267 Phased-array testing or checking devices
• CPC Class Codes: H04B 17/21 for calibration; for correcting measurements
• CPC Class Codes: H04B 7/06 at the transmitting station
• CPC Class Codes: H04B 7/08 at the receiving station

Abstract

Disclosed are Bridging circuitries (BC100), and access points comprising BC100, which may be adapted to perform signal interfacing, signal conditioning, signal analysis and/or other signal processing to signals passing between RF Chains and Baseband Modem Circuits (BBMC), wherein interfacing, conditioning, analysis and/or processing may include: (1) Tx beam forming, (2) Rx Beam forming, (3) per beam Rx packet detection, (4) signal analysis and characterization and (4) MIMO spatial expansion. BC100 may include signal processing circuitry adapted to perform simultaneous multi-DOA estimation and packet detection upon multiple beams. BC100 may also be adapted to coordinate operation of the RF Chains and BBMC relative to one another. BC100 may also comprise memory for storing signal characteristics which may be utilized to improve its operation

Claims

1. A wireless communication system comprising:

a radio block comprising two or more radio frequency chains for receiving and transmitting wireless signals including wireless data packets;

a modem block comprising one or more baseband modem circuits; and

bridging circuitry situated on a signal path between said radio block and said modem block adapted to perform digital preprocessing of signals received by said radio frequency chains and to forward the preprocessed signals to at least one of said one or more modem circuits, said bridging circuitry comprising;

wireless packet detection and characterization circuitry adapted to detect arrival of a given wireless packet and estimate one or more multipath directions from which the given wireless packet is arriving;

direction selection logic adapted to select two or more wireless packet arrival directions for reception; and

a dynamic Rx beamforming unit adapted to either generate or to steer an Rx beam in each of the selected wireless packet arrival directions.

2. The system according to claim 1, wherein said direction selection logic is adapted to select two or more directions for reception based on detected packet parameters determined by said packet detection and characterization circuitry.

3. The system according to claim 2, wherein packet parameters used to select two or more directions for reception are selected from the group consisting of:

(1) post-beamforming energy within cyclic prefix of detected packet preamble;

(2) A ratio of post-beamforming energy within cyclic prefix of detected packet preamble over the energy outside of the cyclic prefix of detected packet preamble; and

(3) a ratio of post beamforming energy within cyclic prefix of detected packet preamble over the energy outside of the cyclic prefix of detected packet preamble combined with the estimated noise energy.

4. The system according to claim 3, wherein a maximum allowable beam overlap threshold is factored as part of selecting two or more directions for reception and dynamic beamforming.

5. The system according to claim 1, wherein the wireless packet detection and characterization circuitry comprises a set of match filters, and wherein substantially each match filter is configured for a specific direction of arrival.

6. The system according to claim 5, wherein each match filter is configured for a specific direction of arrival and a specific client transmission antenna configuration.

7. The system according to claim 1, wherein the wireless packet detection and characterization circuitry comprises time of arrival (TOA) measurement or estimation functionality for determining a difference in time of arrival for the given packet from different directions.

8. The system according to claim 7, wherein output at beam ports of the beamforming unit are dynamically adjusted or delayed for the given packet based on the TOA estimates for each of the selected packet reception directions.

9. The system according to claim 1, wherein said bridging circuitry comprises a Whitener unit for whitening beamformed signals.

10. The system according to claim 9, wherein whitening comprises decorrelating noise across multiple inputs while relaying one antenna signal without decorrelation, such that said whitener unit outputs two or more signals comprising decorrelated noise and one signal unchanged from its form as received by an RF Chain.

11. The system according to claim 9, wherein said whitener unit is adapted to perform whitening of given received signals based on signal parameters determined by said packet detection and characterization circuitry in relation to the given received signals.

12. The system according to claim 1, further comprising a calibration network.

13. The system according to claim 12, wherein said bridging circuitry is further adapted to:

(1) use said calibration network to determine phase differences between said radio frequency chains; and

(2) compensate for the determined phase differences.

14. A wireless communication system comprising:

a radio block comprising two or more radio frequency chains for receiving and transmitting wireless signals;

a modem block comprising one or more baseband modem circuits; and

bridging circuitry situated on a signal path between said radio block and said modem block and adapted to perform digital preprocessing of signals received from said one or more modem circuits and to forward the preprocessed signals to at least one of said radio frequency chains for transmission, said bridging circuitry comprising;

wireless packet detection and characterization circuitry adapted to detect arrival of a given packet from a given client device and to estimate one or more multipath directions from which the given wireless packet arrived;

a dynamic Tx beamforming unit adapted to perform beamforming upon signals received from said modem circuits; and

a controller adapted to cause said Tx beamforming unit to perform beamforming, of two or more beams in two or more selected directions, for transmitting a signal generated by said modem circuits and intended for the given client device, wherein direction selection for Tx beamforming is at least partially based on parameters determined by said packet detection and characterization circuitry for the given wireless packet received from the given client device.

15. The system according to claim 14, wherein packet parameters used to select two or more directions for Tx beamforming are selected from the group consisting of:

(1) post-beamforming energy within cyclic prefix of detected packet preamble;

(2) A ratio of post-beamforming energy within cyclic prefix of detected packet preamble over the energy outside of the cyclic prefix of detected packet preamble; and

(3) a ratio of post beamforming energy within cyclic prefix of detected packet preamble over the energy outside of the cyclic prefix of detected packet preamble combined with the estimated noise energy.

16. The system according to claim 15, wherein a maximum allowable beam overlap threshold is factored as part of selecting two or more directions for Tx beamforming.

17. The system according to claim 15, wherein Tx beamforming includes selection of an energy level per selected Tx direction.

18. The system according to claim 14, wherein Tx beamforming includes selection of a delay to apply to each beam port of said Tx beamforming unit.

19. The system according to claim 14, wherein said bridging circuitry is further adapted to perform spatial expansion upon the signal generated by said modem circuits based on the parameters determined by said packet detection and characterization circuitry in relation to the one or more signals received from the wireless client.

20. A system for providing wireless data communication comprising:

a radio block comprising two or more radio frequency chains for receiving and transmitting wireless signals;

a modem block comprising one or more baseband modem circuits; and

a calibration network adapted to facilitate determination of phase differences between said radio frequency chains; and

bridging circuitry situated on a signal path between said radio block, said calibration network and said modem block adapted to perform dynamic Rx beamforming and dynamic Tx beamforming of signals received or transmitted by said radio block while compensating for the phase differences between said radio frequency chains.

21. The system according to claim 20, wherein said bridging circuitry is further adapted to receive signals for transmission from said baseband modem circuits, process the signals for transmission and transfer the processed signals for transmission to said RF chains.

22. Bridging circuitry comprising:

one or more inputs for receiving signals from one or more Radio Frequency (RF) Chains;

one or more outputs for forwarding signals to one or more baseband modem circuits; and

first signal processing circuitry adapted to be situated on a signal path between the RF Chains and the modem circuits and to perform digital preprocessing of signals received from the RF chains and to forward the preprocessed signals to at least one of the one or more modem circuits.

23. The bridging circuitry according to claim 22, wherein said first signal processing circuitry comprises:

packet detection and characterization circuitry; and

dynamic Rx beamforming circuitry for forming at least two beams for each packet.

24. The bridging circuitry according to claim 23, wherein said dynamic Rx beamforming circuitry is adapted to perform beamforming of the received signals based on signal parameters determined by said packet detection and characterization circuitry.

25. The bridging circuitry according to claim 22, wherein said first signal processing circuitry comprises a Whitener unit for whitening at least one of the received signals.

26. The bridging circuitry according to claim 25, wherein whitening comprises decorrelating noise across multiple inputs while passing one antenna signal without decorrelation.

27. The bridging circuitry according to claim 25, wherein said first signal processing circuitry comprises packet detection and characterization circuitry and said whitener unit is adapted to perform whitening of received signals based on signal parameters determined by said packet detection and characterization circuitry.

28. The bridging circuitry according to claim 22, wherein said first signal processing circuitry comprises calibration circuitry adapted to perform calibration of the RF chains.