Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Modulation for MIMO Networks with Several Users   In a recent work, a capacity-achieving scheme for the common-message two-user
MIMO broadcast channel, based on single-stream coding and decoding, was
described. This was obtained via a novel joint unitary triangularization which
is applied to the corresponding channel matrices. In this work, the
triangularization is generalized, to any (finite) number of matrices, allowing
multi-user applications. To that end, multiple channel uses are jointly
treated, in a manner reminiscent of space-time coding. As opposed to the
two-user case, in the general case there does not always exist a perfect
(capacity-achieving) solution. However, a nearly optimal scheme (with vanishing
loss in the limit of large blocks) always exists. Common-message broadcasting
is but one example of communication networks with MIMO links which can be
solved using an approach coined "Network Modulation"; the extension beyond two
links carries over to these problems.

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The categories of this paper are: hep-ph
22
The categories of this paper are: chao-dyn
19
The categories of this paper are: eess
31
The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph
3
The categories of this paper are: physics
20
The categories of this paper are: acc-phys
35
The categories of this paper are: mtrl-th
11
The categories of this paper are: hep-lat
34
The categories of this paper are: chem-ph
13
The categories of this paper are: quant-ph
21
The categories of this paper are: adap-org
37
The categories of this paper are: supr-con
14
The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
7
The categories of this paper are: hep-th