分子通讯中的介质调制
Media Modulation in Molecular Communications
摘要：
在传统的分子通信（MC）系统中，用于信息传输的信号分子被存储、释放，然后由发射器（TX）补充。然而，在TX处补充信号分子在实践中是具有挑战性的。此外，在大多数设想的MC应用中，例如，在医学领域，不希望将TX插入MC系统中，因为这可能损害自然生物过程。在本文中，我们提出了基于媒体调制的MC的概念，其中TX被放置在信道之外，并利用系统内部已经存在的信号分子。我们考虑可以处于不同状态的信号分子，这些信号分子可以通过外部刺激来切换。因此，在基于媒体调制的MC中，对于信息传输，TX刺激信号分子将信息编码到它们的状态中。特别是，我们阐述了介质调制组的光致变色分子，它经历光致可逆变换，并研究使用这些分子在三维管道系统中的信息传输。我们开发了一个统计模型的接收信号，这取决于在系统中的信号分子的分布，状态控制机制的可靠性，和分子传播的随机性。此外，我们分析了基于媒体调制的性能的比特出错率（BER）。我们表明，媒体调制使可靠的信息传输，这使得TX内的信道不必要的。
英文摘要：
In conventional molecular communication (MC) systems, the signaling molecules used for information transmission are stored, released, and then replenished by a transmitter (TX). However, the replenishment of signaling molecules at the TX is challenging in practice. Furthermore, in most envisioned MC applications, e.g., in the medical field, it is not desirable to insert the TX into the MC system, as this might impair natural biological processes. In this paper, we propose the concept of media modulation based MC where the TX is placed outside the channel and utilizes signaling molecules already existing inside the system. We consider signaling molecules that can be in different states which can be switched by external stimuli. Hence, in media modulation based MC, for information transmission, the TX stimulates the signaling molecules to encode information into their state. In particular, we elaborate media modulation for the group of photochromic molecules, which undergo light-induced reversible transformations, and study the usage of these molecules for information transmission in a three-dimensional duct system. We develop a statistical model for the received signal which depends on the distribution of the signaling molecules in the system, the reliability of the state control mechanism, and the randomness of molecule propagation. Furthermore, we analyze the performance of media modulation based MC in terms of the bit error rate (BER). We show that media modulation enables reliable information transmission, which renders a TX inside the channel unnecessary.
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