Hybrid Precoding for Partial-Full Mixed Connection mmWave MIMO

We propose hybrid precoding algorithm for less-investigated partial-full mixed connection (PFMC) architecture in millimeter wave (mmWave) multiple input multiple output (MIMO). The RF chains and the antennas are divided into various subgroups with full connection existing between the RF chains and the antennas of a particular subgroup. We cast the hybrid precoding problem for the PFMC architecture as a matrix factorization problem and propose an algorithm based on alternating minimization with a view to minimize the Euclidean distance between the hybrid precoding sub-matrix for each subgroup and the corresponding sub-matrix of the fully digital optimal precoder. The proposed precoder is able to produce energy efficiency better than the precoders for FC and PC architectures and the existing precoder for the PFMC architecture.