Implementing Single Path and Multipath Techniques Under Feedback Channel for Molecular Communication

In this paper, we have considered the feedback channel for molecular communication in order to increase the rate of communication and also to reduce energy consumption by implementing the single and multipath techniques. The transmitter nanomachine (TN) transmits ‘n’ number of molecules to the receiver nanomachine (RN). If the RN receives the molecules successfully, it will send positive feedback (PF) molecules to the TN; otherwise, it will send negative feedback (NF) molecules. The TN can determine the channel state condition and enforce either single or multipath technique based on the number of received PF and NF. The symbols 1 and 0 describe the PF and NF molecules, respectively. When the TN receives 11 and 00 in a row, the channel state is assumed to be good and bad. If the TN receives either 01 or 10, however, it will consider the channel state to be neither good nor bad (also termed as intermediate state). As a result, we assume that the next expected/predicted symbol of 0 and 1 will bring the channel state into a fixed state, i.e. good or bad. If the next expected symbol is either 0 or 1, we conduct a three-symbol majority vote to determine if the channel is good or bad (for example, if the current state is 10, then 101 is a good state, and if the current state is 01, then 011 is also a good state). Similarly, we get the channel is in bad state after conducting majority voting of the symbols for the next predicted symbol of 0 with the current state 01 and 0 or 10 and 0). In order to achieve a higher average complete transmission of the target molecules as well as a higher communication rate, single path and multipath techniques are used in the good and bad states, respectively. The simulation results using MATLAB show that in the bad state channel, the rate of communication, average successful complete transmission, and mean energy consumption of the desired molecules all perform better using the multipath technique. If the channel state is good, however, the single path technique provides better performance.