A multiplicity of autonomous terminals simultaneously transmits data streams to a compact array of antennas. The array uses imperfect channel-state information derived from transmitted pilots to extract the individual data streams. The power radiated by the terminals can be made inversely proportional to the square-root of the number of base station antennas with no reduction in performance. In contrast if perfect channel-state information were available the power could be made inversely proportional to the number of antennas. A maximum-ratio combining receiver normally performs worse than a zero-forcing receiver. However as power levels are reduced, the cross-talk introduced by the inferior maximum-ratio receiver eventually falls below the noise level and this simple receiver becomes a viable option.
|Title of host publication||Allerton Conference on Communication, Control, and Computing|
|Publisher||Institute of Electrical and Electronics Engineers (IEEE)|
|Publication status||Published - 03 Jan 2012|
Ngo, H. Q., Larsson, E. G., & Marzetta, T. L. (2012). Uplink power efficiency of multiuser MIMO with very large antenna arrays. In Allerton Conference on Communication, Control, and Computing Institute of Electrical and Electronics Engineers (IEEE). https://doi.org/10.1109/Allerton.2011.6120314