Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Generalized MMSE Detection with Reduced Complexity for Spatially
  Multiplexed MIMO Signals   In multiple-input multiple-output (MIMO) spatially multiplexing (SM) systems,
achievable error rate performance is determined by signal detection strategy.
The optimal maximum-likelihood detection (MLD) that exhaustively examines all
symbol candidates has exponential complexity and may not be applicable in many
practical systems. In this paper, we consider a generalized minimum mean square
error (MMSE) detection derived from conditional mean estimation, which in
principle behaves equivalently to MLD but also includes a linear MMSE detection
as a special case. Motivated by this fact, we propose a low-complexity
detection which significantly reduces the number of examined symbol candidates
without significant error rate performance degradation from MLD. Our approach
is to approximate the probability density function (pdf) of modulated symbols
that appears in the exact conditional mean expression such that the decision
metric can be cast into a partially closed form. It is found that uniform ring
approximation in combination with phase shift keying (PSK) and amplitude phase
shift keying (APSK) is promising, as it can achieve a performance even
comparable to MLD, while its complexity is linear when the number of transmit
antennas is two.

3
The categories of this paper are: physics
30
The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph
9
The categories of this paper are: nlin
22
The categories of this paper are: chao-dyn
7
The categories of this paper are: hep-th
11
The categories of this paper are: hep-lat
13
The categories of this paper are: quant-ph
17
The categories of this paper are: q-fin
5
The categories of this paper are: gr-qc
26
The categories of this paper are: bayes-an
19
The categories of this paper are: eess
0
The categories of this paper are: hep-ph
31
The categories of this paper are: ao-sci
16
The categories of this paper are: stat
32
The categories of this paper are: atom-ph