Information Theory and Electromagnetism: Are They Related?
Sergey L. Loyka, Juan Ramon Mosig · 2018
This chapter considers the multiple-input-multiple-output (MIMO) capacity of waveguide and cavity channels and demonstrate that there is a final number of degrees of freedom in that environment also, which is dictated directly by Maxwell equations that can be exploited for MIMO communications. Electromagnetics and information theory can be nicely united in this case to produce insight that is not available by using either of these disciplines separately. The case of an ideal waveguide MIMO channel is especially interesting because the relationship between information theory and electromagnetics manifests itself in the clearest form in this scenario. The basic electromagnetism laws, which control the electromagnetic field behavior, are expressed as Maxwell equations. The chapter outlines the laws of electromagnetism from a MIMO system perspective. In their most general form, they are expressed as Maxwell equations with charge and current densities as the field sources.