A Pattern Correlation Decomposition Method for Analysis of ESPAR in Single-RF MIMO Systems

A systematic and general method for obtaining orthogonal far-field radiation patterns using any electronically steerable parasitic array radiator (ESPAR) embedded in a propagation environment with an arbitrary power angular spectrum (PAS) is described. The useful designing single-RF multiple-input multiple-output (MIMO) systems where the can be utilized as basis set beamspace MIMO. utilizes correlation matrix of open-circuit termed pattern decomposition (PCDM). PCDM applicable to antenna type (including realistic antennas losses), configuration, PAS overcomes limitations previously proposed techniques. also provides closed-form solutions currents generate patterns. It estimate effective aerial degrees-of-freedom ESPAR. In addition, efficient optimization approaches finding optimal reactive loads that excite required are provided. Simulation examples 5-element 8-element planar inverted-F including material losses various These show approach increases system capacity by up 7 bits/s/Hz or equivalently reduces transmit 73% compared previous approaches.