Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Diffusion Based Molecular Communication: Principle, Key Technologies,
  and Challenges   Molecular communication (MC) is a kind of communication technology based on
biochemical molecules for internet of bio-nano things, in which the biochemical
molecule is used as the information carrier for the interconnection of
nano-devices. In this paper, the basic principle of diffusion based MC and the
corresponding key technologies are comprehensively surveyed. In particular, the
state-of-the-art achievements relative to the diffusion based MC are discussed
and compared, including the system model, the system performance analysis with
key influencing factors, the information coding and modulation techniques.
Meanwhile, the multi-hop nano-network based on the diffusion MC is presented as
well. Additionally, given the extensiveness of the research area, open issues
and challenges are presented to spur future investigations, in which the
involvement of channel model, information theory, self-organizing nano-network,
and biochemical applications are put forward.

7
The categories of this paper are: hep-th
9
The categories of this paper are: nlin
0
The categories of this paper are: hep-ph
29
The categories of this paper are: funct-an
32
The categories of this paper are: atom-ph
11
The categories of this paper are: hep-lat
37
The categories of this paper are: supr-con
17
The categories of this paper are: q-fin
36
The categories of this paper are: cmp-lg
21
The categories of this paper are: adap-org
15
The categories of this paper are: nucl-ex
28
The categories of this paper are: alg-geom
19
The categories of this paper are: eess
4
The categories of this paper are: cond-mat
24
The categories of this paper are: dg-ga
31
The categories of this paper are: ao-sci