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      On the Design of Matched Filters for Molecule Counting Receivers

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          Abstract

          In this paper, we design matched filters for diffusive molecular communication systems taking into account the following impairments: signal-dependent diffusion noise, inter-symbol interference (ISI), and external interfering molecules. The receiver counts the number of observed molecules several times within one symbol interval and employs linear filtering to detect the transmitted data. We derive the optimal matched filter by maximizing the expected signal-to-interference-plus-noise ratio of the decision variable. Moreover, we show that for the special case of an ISI-free channel, the matched filter reduces to a simple sum detector and a correlator for the channel impulse response for the diffusion noise-limited and (external) interference-limited regimes, respectively. Our simulation results reveal that the proposed matched filter considerably outperforms the benchmark schemes available in literature, especially when ISI is severe.

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          Most cited references 5

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          A Comprehensive Survey of Recent Advancements in Molecular Communication

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

            In this paper, we perform receiver design for a diffusive molecular communication environment. Our model includes flow in any direction, sources of information molecules in addition to the transmitter, and enzymes in the propagation environment to mitigate intersymbol interference. We characterize the mutual information between receiver observations to show how often independent observations can be made. We derive the maximum likelihood sequence detector to provide a lower bound on the bit error probability. We propose the family of weighted sum detectors for more practical implementation and derive their expected bit error probability. Under certain conditions, the performance of the optimal weighted sum detector is shown to be equivalent to a matched filter. Receiver simulation results show the tradeoff in detector complexity versus achievable bit error probability, and that a slow flow in any direction can improve the performance of a weighted sum detector.
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              On Receiver Design for Diffusion-Based Molecular Communication

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                Author and article information

                Journal
                2017-05-04
                Article
                1705.01733

                http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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                To appear in IEEE Communications Letter
                cs.IT math.IT

                Numerical methods, Information systems & theory

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