Abstract-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.
In REF , the results obtained suggest to scale the transmission power by the square root of the number of base station antennas, as opposed to scaling by the number of antennas.
Uplink power efficiency of multiuser MIMO with very large antenna arrays
2011 49th Annual Allerton Conference on Communication, Control, and Computing (Allerton)
2011 49th Annual Allerton Conference on Communication, Control, and Computing (Allerton)
Computer Science