Quantization of channel state information in multiple antenna systems

A user device comprising:

• a processor;
• a plurality of antennas;
• and
• a transceiver coupled to the processor and the plurality of antennas;
• and
• wherein the processor, the transceiver, and the plurality of antennas are operable to, in a multi-user multiple input and multiple output (MIMO) mode:
• transmit one index corresponding to one of a plurality of pre-quantized channel vectors to a multiple-antenna transmitter;
• receive a signal from the multiple-antenna transmitter including data for a plurality of user devices based on the transmitted index;
• and
• recover data from the received signal, the data transmitted using a pre-quantized channel vector corresponding to the index, the pre-quantized channel vector having a length based on a number of antennas at the multiple-antenna transmitter.

A non-transitory computer-readable medium comprising instructions stored thereon which when executed by a processor of a user device operate the user device to:

• in a multi-user multiple input and multiple output (MIMO) mode:
• transmit one index corresponding to one of a plurality of pre-quantized channel vectors to a multiple-antenna transmitter;
• receive a signal from the multiple-antenna transmitter including data for a plurality of user devices based on the transmitted index;
• and
• recover data from the received signal, the data transmitted using a pre-quantized channel vector corresponding to the index, the pre-quantized channel vector having a length based on a number of antennas at the multiple-antenna transmitter.