Systems and methods for beamforming in a massive MIMO system

摘要

Embodiments provide systems and methods for enabling a first transceiver to learn beamforming weights (e.g., Eigen beamforming weights) to a second transceiver, without any pilot signaling or explicit beamforming weight signaling from the second transceiver. In another embodiment, beamforming weight vectors to enable a multi-symbol spatial rate can be learned by the first transceiver.

主权项

1. A method for conveying a beamforming vector from a first transceiver to a second transceiver, comprising:
receiving, using a plurality of first antennas of the first transceiver, a plurality of first reference signals transmitted respectively from a plurality of second antennas of the second transceiver; estimating a channel from the plurality of second antennas to the plurality of first antennas based on the plurality of first reference signals; decomposing the channel into a first unitary matrix, a diagonal matrix, and a second unitary matrix; and transmitting, from the plurality of first antennas, one or more beamformed reference signals, the one or more beamformed reference signals resulting from multiplying one or more second reference signals by respective vectors of the first unitary matrix of the channel, wherein said transmitting comprises transmitting, from the plurality of first antennas, a first beamformed reference signal simultaneously on a same frequency by each of the plurality of first antennas, the first beamformed reference signal resulting from multiplying a respective one of the one or more second reference signals by a first column vector of the first unitary matrix of the channel.