Abstract :
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Recently, communication systems with multiple transmission and
reception antennas (MIMO) have been introduced and proven to be
suitable for achieving a high spectral efficiency. Assuming full
channel knowledge at the receiver, so-called sphere detectors have
been shown to solve the maximum likelihood detection problem at
acceptable complexity. In the context of coded transmission,
however, the detector has to generate soft output information for
every transmitted bit. Existing detectors provide this by
observing a high number of hypotheses about the transmitted
symbol, which is computationally expensive.
In this paper, we introduce Smart Candidate Adding, a new
scheme that performs multiple directed searches to obtain only a
small set of symbol hypotheses, but with a good representation of
all possibly transmitted bit constellations. Simulation shows that
the new approach outperforms conventional schemes, both in terms
of detection performance and computational complexity.
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