Molecular Code-Division Multiple-Access: Signaling, Detection, and Performance
CoRR(2024)
摘要
To accomplish relatively complex tasks, in Internet of Bio-Nano Things
(IoBNT), information collected by different nano-machines (NMs) is usually sent
via multiple-access channels to fusion centers (FCs) for further processing.
Relying on two types of molecules, in this paper, a molecular code-division
multiple-access (MoCDMA) scheme is designed for multiple NMs to simultaneously
send information to an access-point (AP) in a diffusive molecular
communications (DMC) environment. We assume that different NMs may have
different distances from AP, which generates `near-far' effect.
Correspondingly, the uniform and channel-inverse based molecular emission
schemes are proposed for NMs to emit information molecules. To facilitate the
design of different signal detection schemes, the received signals by AP are
represented in different forms. Specifically, by considering the limited
computational power of nano-machines, three low-complexity detectors are
designed in the principles of matched-filtering (MF), zero-forcing (ZF), and
minimum mean-square error (MMSE). The noise characteristics in MoCDMA systems
and the complexity of various detection schemes are analyzed. The error
performance of the MoCDMA systems with various molecular emission and detection
schemes is demonstrated and compared. Our studies and performance results
demonstrate that MoCDMA constitutes a promising scheme for supporting
multiple-access transmission in DMC, while the channel-inverse based
transmission can ensure the fairness of communication qualities (FoCQ) among
different NMs. Furthermore, different detection schemes may be implemented to
attain a good trade-off between implementation complexity and communication
reliability.
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