Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Robust Downlink Throughput Maximization in MIMO Cognitive Network with
  more Realistic Conditions: Imperfect Channel Information & Presence of
  Primary Transmitter   Designing an efficient scheme in physical layer enables cognitive radio (CR)
users to efficiently utilize resources dedicated to primary users (PUs). In
this paper in order to maximize the SU's throughput, the SU's transceivers
beamforming is designed through new model considering the presence of the PU's
transmitter. Since presence of primary transmitter basically degrades CR's
system performance; proposed beamforming design considers intra-system
interference between PUs and SUs. An optimization problem based on maximizing
CR network throughput subject to controlling interference power from SU
transmitter to PU receiver has been formulated. Due to limited cooperation
between PU and SU network, channel state information (CSI) between two networks
are assumed to be partially available, subsequently conventional CSI
uncertainty model known as norm bounded error model has been employed. The
proposed optimization problem, which is basically difficult to solve, has been
converted to a semi definite program which can be efficiently solved by
optimization toolbox software e.g., CVX-Mathlab. Furthermore, alternative time
efficient and close form solutions are derived. The superiority of the proposed
approach in comparison with the previous works has been confirmed through the
simulation results.

28
The categories of this paper are: alg-geom
21
The categories of this paper are: adap-org
6
The categories of this paper are: astro-ph
30
The categories of this paper are: q-alg
12
The categories of this paper are: nucl-th
26
The categories of this paper are: bayes-an
18
The categories of this paper are: econ
3
The categories of this paper are: physics
34
The categories of this paper are: chem-ph
25
The categories of this paper are: patt-sol
16
The categories of this paper are: stat
9
The categories of this paper are: nlin
8
The categories of this paper are: hep-ex
11
The categories of this paper are: hep-lat
7
The categories of this paper are: hep-th
27
The categories of this paper are: comp-gas