A Communication Theoretical Analysis of Multiple Multiple-Access Access Channel Capacity in Magneto Magneto-Inductive Wireless Networks
Abstract: Magneto-inductive inductive (MI) wireless communications is an emerging subject with a rich set of applications, including local area networks for the Internet-of-Things, Internet wireless body area networks, in in-body and on-chip chip communications, and underwater and underground sensor networks as a low-cost cost alternative to radio frequency, acoustic or optical methods. Practical MI networks include multiple access channel (MAC) mechanisms for connecting a random number of coils without any specific topology or coil orientation ass assumptions umptions covering both short and long ranges. However, there is not any information theoretical modeling of MI MAC (MIMAC) capacity of such universal networks with fully coupled frequency selective channel models and exact 33-D D coupling model of circular coils co instead of long range dipole approximations. In this paper, K K-user user MIMAC capacity is information theoretically modeled and analyzed, and two two-user user MIMACs are modeled with explicitly detailed channel responses, bandwidths and coupled thermal noise. K-userr MIMAC capacity is achieved through Lagrangian solution with K-user water-filling filling optimization. Optimum orientations maximizing capacity and received power are theoretically analyzed, and numerically simulated for two-user user MIMACs. Constructive gain and de destructive structive interference mechanisms on MIMACs are introduced in comparison with the classical interference based approaches. The theoretical basis promises the utilization of MIMACs in 5G architectures.