1. An eNodeB (eNB) comprising: a plurality of antenna ports with a plurality of antenna elements; subspace identification circuitry coupled with the plurality of antenna elements, the subspace identification circuitry to: identify, based on feedback information, a plurality of beamforming weights for one or multiple antenna ports wherein a number of the antenna ports is less than a number of the plurality of antenna elements; and assign a beamforming weight in the plurality of beamforming weights to an antenna in the plurality of antenna elements; and transmitter circuitry coupled with the subspace identification circuitry, the transmitter circuitry to: beamform a channel training signal allocated for the antenna port with the beamforming weights; and transmit an antenna port configuration schedule from the plurality of antennas.