Noncoherent Detection for Dynamic Transmitter and Receiver in Molecular Communication

In molecular communications (MC), previous studies on various detection and modulation methods, and mitigation of inter-symbol interference (ISI) primarily are based on static transmitter and receiver nano-machines. However, in many applications including targeted drug delivery system, a dynamic behavior of communicating nano-machines is observed, and coherent detection methods are not suitable due to continuously changing channel characteristics. In this work, we have proposed a new iterative non-coherent signal detection method by considering the block-wise data symbols estimation for mobile MC, where both the transmitter and the receiver nano-machines can move or diffuse randomly along with the message molecules. We have also investigated the effect of various design parameters such as the diffusion coefficient and the distance between transmitter and receiver nano-machines for both the static and dynamic MC. The improved bit error rate performance of a MC system is observed using the proposed iterative detection method as compared to a conventional method in the presence of both ISE and counting noise.