On MIMO capacity with partial channel knowledge at the transmitter

The maximum achievable capacity for a MIMO channel corresponds to the waterfilling solution provided that the transmitter has a perfect knowledge of the channel. In practice, the available knowledge may only be partial due to the time selectivity of the channel and delay of the feedback from the receiver. However, exploiting the partial knowledge leads to a significant improvement when compared to the capacity without any channel knowledge. In this paper, we analyze the MIMO capacity with partial knowledge of the channel under practical frequency flat channel models.