Grassmannian precoding for multi-user MIMO system based on the maximal SJNR criterion

In this paper, our purpose is to use the maximal signal-to-jamming-and noise ratio (SJNR) criterion to design a Grassmannian codebook for a precoding scheme in a multi-user MIMO broadcast channel. The proposed approach includes two schemes. In the first, we assume that the channel information at the base station is available. The second scheme is under limited feedback. Both schemes aim to reduce computational complexity and enhance system performances. A comparison of computer simulations with a recent approach based on the maximal system capacity criterion shows that our approach provides greater system performances enhancement with reduced complexity, a key point, by a factor of 10 using low users and codebook size and more than 100 for more than 4 users with a codebook size of 16.