Title: Diffusion Based Molecular Communication: Efficient Modulator and Simple Near Optimal Decoder Abstract: Nenonetworking promises new solutions for many applications in the biomedical and industrial fields. This new paradigm utilizes various methods to communicate information between nano-scale machines. A promising communication method at this scale is molecular communication. Different molecular communication schemes have been proposed that can be categorized based on their effective range of communication. In this talk, a one-dimensional, diffusion-based, molecular communication channel between two nano-machines is considered. Due to extensive molecule propagation times between transmitter and receiver, the effective channel has memory resulting in interference. To deal with the interference, in the first part of the talk, a new modulation scheme, called Molecular Concentration Shift Keying (MCSK) based on using distinct types of molecules for consecutive transmissions is proposed which effectively suppresses the interference due to the last transmitted symbol. While MCSK has zero interference from the previous symbol, but still suffers from interference from the other past symbols. In the second part of talk, a memory-limited, decision-aided decoder is proposed and shown to be near-optimal. The effect of the amount of memory on performance is characterized. This effect is specialized for the case of MCSK; it is shown that four bits of memory achieves nearly the same performance as infinite memory. It is also shown that receiver sampling at a higher rate than the transmission rate can significantly improves the performance. Masoumeh Nasiri-Kenari received her B.S and M.S. degrees in electrical engineering from Isfahan University of Technology, Isfahan, Iran, in 1986 and 1987, respectively, and her Ph.D. degree in electrical engineering from University of Utah, Salt Lake City, in 1993. Since 1994, she has been with the Department of Electrical Engineering, Sharif University of Technology, Tehran, Iran, where she is now a Professor. She founded Wireless Research Laboratory (WRL) of the Electrical Engineering Department in 2001 to coordinate the research activities in the field of wireless communication. Current main activities of WRL are Cooperative and Cognitive Communications, Network Coding, Molecular Communications, and WBAN. She is a recipient of Distinguished Researcher Award and Distinguished Lecturer Award of EE department at Sharif University of Technology in years 2005 and 2007, respectively. She is now a visiting professor at USC, where she is spending her Sabbatical leave and collaborating with Prof. Mitra.