Subspace estimation and decomposition for hybrid analog-digital millimetre-wave MIMO systems

摘要: In this work, we address the problem of channel estimation and precoding / combining for so-called hybrid millimeter wave (mmWave) MIMO architecture. Our proposed scheme exploits reciprocity in TDD systems, by using echoing, thereby allowing us to implement Krylov subspace methods a fully distributed way. The latter results estimating right (resp. left) singular at transmitter receiver). Moreover, also tackle decomposition whereby estimated subspaces are approximated cascade analog digital precoder combiner), an iterative method. Finally compare our with equivalent case conclude that relatively similar performance can be achieved, however, drastically reduced number RF chains - 4 ∼ 8 times less (i.e., massive savings cost power consumption).