In this letter, we propose a new multiple-input multiple-output (MIMO) molecular communication (MC) system where multiple types of molecules are utilized for transmission and reception of information. We call the proposed framework multiple-type transmission multiple-type reception (MTMR). The receiver nanomachines in the proposed scheme are based on the ligand receptors. For the bidirectional communication between the nanomachines, we consider two-way MC. We also obtain the bit error rate (BER) of the system, and an optimization problem is formulated to minimize BER by optimizing the drug dosage for designing a drug release mechanism. As numerical analysis shows, the BER of MIMO-MTMR in MC is minimized to 10−6 by considering the budget of molecules as 5000 for each transmitter. Furthermore, MIMO-MTMR outperforms single-type transmission single-type reception MIMO from the BER performance point of view as discussed in the numerical analysis.

中文翻译：

---

分子通信的多类型传输多类型接收框架

在这封信中，我们提出了一种新的多输入多输出 (MIMO) 分子通信 (MC) 系统，其中利用多种类型的分子来传输和接收信息。我们将提议的框架称为多类型传输多类型接收（MTMR）。所提出方案中的接收器纳米机器基于配体受体。对于纳米机器之间的双向通信，我们考虑双向 MC。我们还获得了系统的误码率 (BER)，并制定了一个优化问题，通过优化药物剂量来最小化 BER，以设计药物释放机制。如数值分析所示，通过考虑每个发射器的分子预算为 5000，MC 中 MIMO-MTMR 的 BER 最小化到 10-6。此外，