Enhanced multiple-input multiple-output beam refinement protocol transmit sector sweep

1. A device of an initiator for performing multiple-input multiple-output (MIMO) beamforming training the device comprising processing circuitry and storage, the processing circuitry coupled to the storage, and the processing circuitry configured to:

establish a first communication link using a first antenna transmit chain of one or more transmit chains of the initiator, wherein the one or more antenna transmit chains further comprise a second antenna transmit chain;

initiate a MIMO beam refinement protocol (BRP) transmit sector sweep (TXSS) over the one or more antenna transmit chains;

map a single space-time stream over the one or more antenna transmit chains;

cause to send, to a responder device, an enhanced directional multi-gigabit (EDMG) frame using spatial expansion based on the mapping of the single space-time stream;

identify a feedback frame from the responder device; and

determine one or more antenna weight vectors (AWVs) to use in a MIMO phase of the MIMO beamforming training based on the feedback frame.

2. The device of claim 1 , wherein to cause to send an EDMG frame using spatial expansion comprises the processing circuitry being further configured to cause to send a first EDMG frame over the first antenna transmit chain and a second EDMG frame over the second antenna transmit chain, wherein the second EDMG frame is the same as the first EDMG frame shifted in a time domain.

3. The device of claim 1 , wherein a training (TRN) field of the EDMG frame comprises one or more orthogonal waveforms.

4. The device of claim 1 , wherein the processing circuitry is further configured to:

identify a repetition indication received from the responder device; and

cause to send, during an initiator BRP TXSS phase, one or more EDMG BRP packets consecutively repeated based on the repetition indication.

5. The device of claim 1 , wherein the MIMO BRP TXSS comprises a setup phase, an initiator BRP TXSS phase, a responder BRP TXSS phase, and a feedback phase.

6. The device of claim 5 , wherein the processing circuitry is further configured to:

use, during the setup phase, a first AWV associated with the first antenna transmit chain; and

cause to send to the responder device one or more fields of a frame using the first AWV during the MIMO BRP TXSS.

7. The device of claim 6 , wherein the one or more fields exclude a training (TRN) field of the frame.

8. The device of claim 1 , further comprising a transceiver configured to transmit and receive wireless signals.

9. The device of claim 8 , further comprising an antenna of the initiator, including the first antenna transmit chain and the second antenna transmit chain, coupled to the processing circuitry.

10. A non-transitory computer-readable medium storing computer-executable instructions which when executed by one or more processors result in performing operations comprising:

establishing a first communication link using a first antenna transmit chain of one or more transmit chains of an initiator, wherein the one or more antenna transmit chains further comprise a second antenna transmit chain;

initiating a MIMO beam refinement protocol (BRP) transmit sector sweep (TXSS) over the one or more antenna transmit chains;

mapping a single space-time stream over the one or more antenna transmit chains;

causing to send, to a responder device, an enhanced directional multi-gigabit (EDMG) frame using spatial expansion based on the mapping of the single space-time stream;

identifying a feedback frame from the responder device; and

determining one or more antenna weight vectors (AWVs) to use in a MIMO phase of the MIMO beamforming training based on the feedback frame.

11. The non-transitory computer-readable medium of claim 10 , wherein to cause to send an EDMG frame using spatial expansion comprises the operations further comprise causing to send a first EDMG frame over the first antenna transmit chain and a second EDMG frame over the second antenna transmit chain, wherein the second EDMG frame is the same as the first EDMG frame shifted in a time domain.

12. The non-transitory computer-readable medium of claim 10 , wherein a training (TRN) field of the EDMG frame comprises one or more orthogonal waveforms.

13. The non-transitory computer-readable medium of claim 10 , wherein the operations further comprise:

identifying a repetition indication received from the responder device; and

causing to send, during an initiator BRP TXSS phase, one or more EDMG BRP packets consecutively repeated based on the repetition indication.

14. The non-transitory computer-readable medium of claim 10 , wherein the MIMO BRP TXSS comprises a setup phase, an initiator BRP TXSS phase, a responder BRP TXSS phase, and a feedback phase.

15. The non-transitory computer-readable medium of claim 14 , wherein the operations further comprise:

using, during the setup phase, a first AWV associated with the first antenna transmit chain; and

causing to send to the responder device one or more fields of a frame using the first AWV during the MIMO BRP TXSS.

16. The non-transitory computer-readable medium of claim 15 , wherein the one or more fields exclude a training (TRN) field of the frame.

17. A method comprising:

establishing, by one or more processors, a first communication link using a first antenna transmit chain of one or more transmit chains of an initiator, wherein the one or more antenna transmit chains further comprise a second antenna transmit chain;

initiating a MIMO beam refinement protocol (BRP) transmit sector sweep (TXSS) over the one or more antenna transmit chains;

mapping a single space-time stream over the one or more antenna transmit chains;

causing to send, to a responder device, an enhanced directional multi-gigabit (EDMG) frame using spatial expansion based on the mapping of the single space-time stream;

identifying a feedback frame from the responder device; and

determining one or more antenna weight vectors (AWVs) to use in a MIMO phase of the MIMO beamforming training based on the feedback frame.

18. The method of claim 17 , wherein to cause to send an EDMG frame using spatial expansion further comprising causing to send a first EDMG frame over the first antenna transmit chain and a second EDMG frame over the second antenna transmit chain, wherein the second EDMG frame is the same as the first EDMG frame shifted in a time domain.

19. The method of claim 17 , wherein a training (TRN) field of the EDMG frame comprises one or more orthogonal waveforms.

20. The method of claim 17 , wherein the processing circuitry is further configured to:

identifying a repetition indication received from the responder device; and

causing to send, during an initiator BRP TXSS phase, one or more EDMG BRP packets consecutively repeated based on the repetition indication.