Fundamental frequency is important in speech perception, since it provides prosodic information to emphasize key words and contributes to speaker identification. Additionally, fundamental frequency contains phonetic value in tonal languages. In the case of hearing impaired patients who have received a cochlear implant, the perception of the fundamental frequency is affected by the technical limitations associated to the procedure of auditory nerve stimulation. In this paper we analyze the possibilities and limitations of cochlear implant systems with respect to perception of the fundamental frequency.