Coverage enhanced reciprocity-based precoding scheme

A base station for determining precoding information, the base station comprising:

• one or more processors;
• and
• memory comprising instructions to cause the base station to:
• determine channel estimates for at least a channel between the base station and another device;
• determine a plurality of precoding hypotheses based on the channel estimates;
• determine a Figure of Merit (FOM), for each of the plurality of precoding hypotheses;
• determine the precoding information based on the FOM for each of the plurality of precoding hypotheses;
• perform matched filtering of received reference symbols and corresponding known reference symbols;
• filter an output of the matched filtering based on a plurality of precoding hypotheses;
• apply a transform to the filtered output for the plurality of precoding hypotheses to produce a plurality of transformed precoding hypotheses;
• calculate a FOM for each of the plurality of transformed precoding hypotheses;
• and
• select a precoder that maximizes the FOM as the precoding information.

A wireless device for determining precoding information, the wireless device comprising:

• one or more processors;
• and
• memory comprising instructions to cause the wireless device to:
• determine channel estimates for at least a channel between the wireless device and another device;
• determine a plurality of precoding hypotheses based on the channel estimates;
• determine a Figure of Merit (FOM), for each of the plurality of precoding hypotheses;
• determine the precoding information based on the FOM for each of the plurality of precoding hypotheses;
• perform matched filtering of received reference symbols and corresponding known reference symbols;
• filter an output of the matched filtering based on a plurality of precoding hypotheses;
• apply a transform to the filtered output for the plurality of precoding hypotheses to produce a plurality of transformed precoding hypotheses;
• calculate a FOM for each of the plurality of transformed precoding hypotheses;
• and
• select a precoder that maximizes the FOM as the precoding information.