Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the Capacity of Waveform Channels Under Square-Law Detection of
  Time-Limited Signals   Capacity bounds for waveform channels under square-law detection of
time-limited complex-valued signals are derived. The upper bound is the
capacity of the channel under (complex-valued) coherent detection. The lower
bound is one bit less, per dimension, than the upper bound.

23
The categories of this paper are: solv-int
36
The categories of this paper are: cmp-lg
18
The categories of this paper are: econ
0
The categories of this paper are: hep-ph
17
The categories of this paper are: q-fin
11
The categories of this paper are: hep-lat
6
The categories of this paper are: astro-ph
30
The categories of this paper are: q-alg
3
The categories of this paper are: physics
20
The categories of this paper are: acc-phys
7
The categories of this paper are: hep-th
32
The categories of this paper are: atom-ph
28
The categories of this paper are: alg-geom
4
The categories of this paper are: cond-mat
9
The categories of this paper are: nlin
22
The categories of this paper are: chao-dyn