An M-Ary Concentration-Shift Keying With Common Detection Thresholds for Multitransmitter Molecular Communication

초록

Concentration-shift keying (CSK) is a widely stud-ied modulation technique for molecular communication-basednanonetworks, which is a key enabler for the Internet of Bio-NanoThings (IoBNT). Existing CSK methods, while offering optimalerror performance, suffer from increased operational complexitythat scales poorly as the number of transmitters,K,grows.In this study, a novelM-ary CSK method is proposed: CSKwith common detection thresholds (CSK-CTs). CSK-CT usescommonthresholds, set sufficiently low to guarantee the reliabledetection of symbols from all transmitters, regardless of distance.Closed-form expressions are derived to obtain the commonthresholds and release concentrations. To further enhance errorperformance, the release concentration is optimized using ascaling exponent that also optimizes the common thresholds. Theperformance of CSK-CT is evaluated against the benchmarkCSK across variousKandMvalues. CSK-CT has an errorprobability between 10(-7)and 10(-4), which is a substantialimprovement from that of the benchmark CSK (from 10(-4)to10(-3)). In terms of complexity, CSK-CT isO(n)and does notscale withKbutM(M << K), whereas the benchmark isO(n2).Furthermore, CSK-CT can mitigate intersymbol interference(ISI), although this facet merits further investigation. Owing toits low error rates, improved scalability, reduced complexity,and potential ISI mitigation features, CSK-CT is particularlyadvantageous for IoBNT applications focused on data gathering.Its effectiveness is especially notable in scenarios where acomputationally limited receiver is tasked with collecting vitalhealth data from multiple transmitters

키워드