Reciprocal geometric precoding

An apparatus for wireless communication, comprising:

• a processor of a network device;
• and
• a wireless transceiver,
• wherein the processor is configured for:
• determining, uplink power allocations assigned to each user device of multiple user devices;
• estimating, a channel response for each user device of multiple user devices based on a corresponding uplink reference signal transmission received from the each user device,
• computing, for the each user device, a covariance matrix based on a corresponding channel response,
• determining a maximum eigenvector of an uplink signal to interference and noise ration (SINR) matrix for the each user device;
• computing, from the uplink SINR matrix, a downlink cross-interference matrix for the each user device;
• selecting, from the downlink cross-interference matrix for the each user device, a selected vector that maximizes a selected criterion for the each user device,
• determining, from the selected vectors of the multiple user devices, a downlink power allocation for the each user device of multiple user devices;
• and
• the wireless transceiver is configured to receive the uplink reference signal transmission.