  In this chapter, the state of the art of in vivo wireless channel
characterization has been presented. Various studies described in the
literature are dedicated to the in vivo communication channel, and they
consider different parameters in studying various anatomical regions.
Furthermore, the location-dependent characteristics of in vivo wireless
communication at 915 MHz are analyzed in detail via numerical and experimental
investigations. A complete model for the in vivo channel is not available and
remains an open research problem. However, considering the expected future
growth of implanted technologies and their potential use for the detection and
diagnosis of various health-related issues in the human body, the channel
modeling studies should be further extended to develop better and more
efficient communications systems for future in vivo systems.
