Method and apparatus of beam training for MIMO operation

摘要

The disclosed invention provides an efficient method for beam training to enable spatial multiplexing MIMO operation and spatial combining in a wireless network. The invention discloses a simple and efficient beam-training algorithm and protocol for MIMO operation that operates in high SNR condition for reliable MIMO operation. In one novel aspect, the best MIMO beam combinations are determined after TX sector sweeping and RX sector sweeping. In addition, the selection criteria includes not only signal quality, but also considers mutual interference and leakage among multiple MIMO spatial streams to improve overall MIMO performance.

主权项

1. An initiator device, comprising:
a transceiver that communicates a beam-training message that initiates a multiple input and multiple output (MIMO) training procedure in a wireless network, the transceiver comprises a transmitter; the transmitter is configured to transmit training packets using all TX sectors during TX sector sweeping and in response obtaining a set of selected TX sectors, each of the TX sectors corresponds to a specific TX antenna beam, the transmitter is further configured to transmit training packets using omni-direction antenna pattern during RX sector sweeping and in response obtaining a set of selected RX sectors, and each of the RX sectors corresponds to a specific RX antenna beam; a processor is configured to start MIMO beam combination training based on the selected TX and RX sectors by the transmitter being configured to transmit training packets using the selected TX sectors, each of the MIMO beam combinations includes one of the selected TX sectors and one of the selected RX sectors; and a MIMO encoder is configured to obtain one or more best MIMO beam combinations for multiple MIMO spatial streams, each of the best MIMO beam combinations is selected based on the results of the MIMO beam combination training.