Transmitter diversity solutions for multiple antennas
The study done in this TR focuses on transmit diversity methods with more than 2 antennas at the Node B and 1 antenna at the UE. The functionality introduced to support more than 2 antennas at the Node B could permit consideration of compatible operation with 2 antennas.
A proposal for a new transmit diversity method using multiple antennas may be included in the TR if at least the following requirements are fulfilled:
a) it should be shown that there is significant benefit in at least one realistic scenario, e.g. one of the (multi-)path models of table 7; for closed loop methods also feedback errors and delays need to be considered.
b) the description should be detailed enough to see how it fits into the current specification (so it is in principle clear what changes need to be done).
c) relevant R99 schemes should be used as reference cases depending on the proposal (open or closed loop, or both)
d) backwards compatibility needs to be addressed
This evaluation of different transmit diversity schemes for multiple antennas is within the scope of this TR.