MMSE V-BLAST for Imperfect MIMO Channels

In practical V-BLAST systems, channel estimation is often imperfect due to noise and interference. This paper analyzes the impacts of imperfect channel estimation on MMSE V-BLAST system under the assumption that the channel estimation errors are unknown deterministic and norm-bounded. Two novel V-BLAST ordering algorithms are therefore presented with the idea of worst-case post-processing performance optimization. The proposed algorithms organize the order of symbol processing according to their worst-case post-processing performance while maintain the simple implementation of the V-BLAST structure. The simulation results show our approaches are robust to the channel estimation errors.