In diffusion-based molecular communications, time synchronization is a major reason for the increase of system structure complexity. In this paper, we consider the asynchronous receiver design for molecular communications with information symbols conveyed in the time of released molecules. The main contribution of this paper is that we develop a detector called clock-free asynchronous receiver design (CFARD), in which the receiver recovers the information symbols without measuring the arrival time of molecules. The theoretical analysis indicates that compared with the synchronous receiver designs, the proposed scheme considerably lowers the structure complexity for information demodulation, which is of great significance to the feasibility of nano-scale molecular communications systems with the limitation of energy and size. The numerical results show that in the comparison of bit error ratio (BER) performance, the proposed asynchronous receiver design outperforms the synchronous linear average filter (LAF) detector and approaches to the synchronous maximum likelihood (ML) detector and first arrival (FA) detector.

中文翻译：

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基于扩散的分子通信中分子定时通道的无时钟异步接收器设计。

在基于扩散的分子通信中，时间同步是系统结构复杂性增加的主要原因。在本文中，我们考虑了用于分子通信的异步接收器设计，其中信息符号在释放的分子时间内传递。本文的主要贡献在于，我们开发了一种称为无时钟异步接收器设计（CFARD）的检测器，其中，接收器可以在不测量分子到达时间的情况下恢复信息符号。理论分析表明，与同步接收机设计相比，该方案显着降低了信息解调的结构复杂度，对于能量和大小受限的纳米级分子通信系统的可行性具有重要意义。