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Concentration shift keying (CSK) is a widely studied modulation technique formolecular communication-based nanonetworks, which is a key enabler for theInternet of Bio-NanoThings (IoBNT). Existing CSK methods, while offeringoptimal error performance, suffer from increased operational complexity thatscales poorly as the number of transmitters, $K$, grows. In this study, a novel$M$-ary CSK method is proposed: CSK with common detection thresholds (CSK-CT).CSK-CT uses \textit{common} thresholds, set sufficiently low to guarantee thereliable detection of symbols from all transmitters, regardless of distance.Closed-form expressions are derived to obtain the common thresholds and releaseconcentrations. To further enhance error performance, the release concentrationis optimized using a scaling exponent that also optimizes the commonthresholds. The performance of CSK-CT is evaluated against the benchmark CSKacross various $K$ and $M$ values. CSK-CT has an error probability between$10^{-7}$ and $10^{-4}$, which is a substantial improvement from that of thebenchmark CSK (from $10^{-4}$ to $10^{-3}$). In terms of complexity, CSK-CT is$\mathcal{O}\big(n\big)$ and does not scale with $K$ but $M$ ($M\ll K$),whereas the benchmark is $\mathcal{O}\big(n^2\big)$. Furthermore, CSK-CT canmitigate inter-symbol interference (ISI), although this facet merits furtherinvestigation. Owing to its low error rates, improved scalability, reducedcomplexity, and potential ISI mitigation features, CSK-CT is particularlyadvantageous for IoBNT applications focused on data gathering. Itseffectiveness is especially notable in scenarios where a computationallylimited receiver is tasked with collecting vital health data from multipletransmitters.

An $M$-ary Concentration Shift Keying with Common Detection Thresholds For Multitransmitter Molecular Communication