Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Geometrical and Numerical Design of Structured Unitary Space Time
  Constellations   In this paper we propose constellations with suitable structure which allow
one to construct codes with excellent diversity using geometrical symmetry and
numerical methods. We also demonstrate how these structured constellations
out-perform currently existing constellations and explain why the proposed
constellation structure admit simple decoding algorithm: sphere decoding. The
presented design methods work for any dimensional constellation and for any
transmission rate. Moreover codes based on the proposed structure are very
flexible and can be optimized for any signal to noise ratio.

6
The categories of this paper are: astro-ph
28
The categories of this paper are: alg-geom
36
The categories of this paper are: cmp-lg
9
The categories of this paper are: nlin
4
The categories of this paper are: cond-mat
21
The categories of this paper are: adap-org
18
The categories of this paper are: econ
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The categories of this paper are: gr-qc
13
The categories of this paper are: quant-ph
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The categories of this paper are: q-bio
0
The categories of this paper are: hep-ph
25
The categories of this paper are: patt-sol
27
The categories of this paper are: comp-gas
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The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
24
The categories of this paper are: dg-ga