Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Soft-Output Sphere Decoder for Multiple-Symbol Differential Detection of
  Impulse-Radio Ultra-Wideband   Power efficiency of noncoherent receivers for impulse-radio ultra-wideband
(IR-UWB) transmission systems can significantly be improved, on the one hand,
by employing multiple-symbol differential detection (MSDD), and, on the other
hand, by providing reliability information to the subsequent channel decoder.
In this paper, we combine these two techniques. Incorporating the computation
of the soft information into a single-tree-search sphere decoder (SD), the
application of this soft-output MSDD in a typical IR-UWB system imposes only a
moderate complexity increase at, however, improved performance over hard-output
MSDD, and in particular, over conventional symbol-by-symbol noncoherent
differential detection.

25
The categories of this paper are: patt-sol
10
The categories of this paper are: q-bio
11
The categories of this paper are: hep-lat
7
The categories of this paper are: hep-th
33
The categories of this paper are: plasm-ph
3
The categories of this paper are: physics
26
The categories of this paper are: bayes-an
29
The categories of this paper are: funct-an
9
The categories of this paper are: nlin
12
The categories of this paper are: nucl-th
19
The categories of this paper are: eess
36
The categories of this paper are: cmp-lg
17
The categories of this paper are: q-fin
13
The categories of this paper are: quant-ph
21
The categories of this paper are: adap-org
34
The categories of this paper are: chem-ph