Optimal Receiver Design for Diffusive Molecular Communication With Flow and Additive Noise

摘要

In this paper, we perform receiver design for a diffusive molecularcommunication environment. Our model includes flow in any direction, sources ofinformation molecules in addition to the transmitter, and enzymes in thepropagation environment to mitigate intersymbol interference. We characterizethe mutual information between receiver observations to show how oftenindependent observations can be made. We derive the maximum likelihood sequencedetector to provide a lower bound on the bit error probability. We propose thefamily of weighted sum detectors for more practical implementation and derivetheir expected bit error probability. Under certain conditions, the performanceof the optimal weighted sum detector is shown to be equivalent to a matchedfilter. Receiver simulation results show the tradeoff in detector complexityversus achievable bit error probability, and that a slow flow in any directioncan improve the performance of a weighted sum detector.