Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Sum Capacity Loss Quantification With Optimal and Sub-Optimal Precoding
  in Heterogeneous Multiuser Channels   We analytically approximate the expected sum capacity loss between the
optimal downlink precoding technique of dirty paper coding (DPC), and the
sub-optimal technique of zero-forcing precoding, for multiuser channels. We
also consider the most general case of multi-stream transmission to multiple
users, where we evaluate the expected sum capacity loss between DPC and block
diagonalization precoding. Unlike previously, assuming heterogeneous Ricean
fading, we utilize the well known affine approximation to predict the expected
sum capacity difference between both precoder types (optimal and sub-optimal)
over a wide range of system and propagation parameters. Furthermore, for
single-stream transmission, we consider the problem of weighted sum capacity
maximization, where a similar quantification of the sum capacity difference
between the two precoder types is presented. In doing so, we disclose that
power allocation to different users proportional to their individual weights
asymptotically maximizes the weighted sum capacity. Numerical simulations are
presented to demonstrate the tightness of the developed expressions relative to
their simulated counterparts.

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The categories of this paper are: supr-con
25
The categories of this paper are: patt-sol
16
The categories of this paper are: stat
8
The categories of this paper are: hep-ex
34
The categories of this paper are: chem-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: q-alg
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The categories of this paper are: dg-ga
5
The categories of this paper are: gr-qc
4
The categories of this paper are: cond-mat
15
The categories of this paper are: nucl-ex
6
The categories of this paper are: astro-ph
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The categories of this paper are: q-fin
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The categories of this paper are: nucl-th
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The categories of this paper are: q-bio
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The categories of this paper are: chao-dyn