Molecular communication (MC) can enable the transfer of information between nanomachines using molecules as the information carrier. In MC systems, multiple receiver nanomachines often co-exist in the same communication channel to serve common or different purposes. However, the analytical channel model for a system with multiple fully absorbing receivers (FARs) does not exist in the literature, which is significantly different from the single FAR system due to the mutual influence of FARs. The analytical channel model is essential in analyzing systems with multiple FARs, including MIMO, SIMO, and cognitive molecular communication systems. In this work, we derive an approximate analytical expression for the hitting probability of a molecule emitted from a point source on each FAR on a diffusion-based MC system with three or more FARs. Using these expressions, we derive the channel model for a SIMO system with a single transmitter and multiple FARs arranged in a uniform circular array (UCA). We then analyze the communication performance of this SIMO system under different cooperative receiver schemes and develop several interesting insights.

翻译：分子通信(MC)能够使使用分子作为信息载体的纳米机器之间能够进行信息传输。在MC系统中,多个接收器纳米机器经常在同一通信渠道内同时存在,为共同或不同的目的服务。然而,文献中没有具有具有多个完全吸收接收器(FARs)的系统的分析信道模式,由于FARs的相互影响,这种模式与单一的FAR系统有很大不同。分析渠道模式对于分析多个FAR(包括MIMO、SIMO和认知分子通信系统)的系统至关重要。在这项工作中,我们对从每个FAR的点源中发射的分子在三个或三个以上FARs的基于扩散的MMC系统中的触碰概率作了大致的分析表达。我们用这些表达方式为SIMO系统提供了一种频道模式,一个单一发射器和多个FARs在统一的圆形中安排。我们随后根据不同的合作接收器计划分析了SIMO系统的通信性能,并发展了几个有趣的洞察力。