Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Efficiently and Globally Solving Joint Beamforming and Compression
  Problem in the Cooperative Cellular Network via Lagrangian Duality   Consider the joint beamforming and quantization problem in the cooperative
cellular network, where multiple relay-like base stations (BSs) connected to
the central processor (CP) via rate-limited fronthaul links cooperatively serve
the users. This problem can be formulated as the minimization of the total
transmit power, subject to all users' signal-to-interference-plus-noise-ratio
(SINR) constraints and all relay-like BSs' fronthaul rate constraints. In this
paper, we first show that there is no duality gap between the considered
problem and its Lagrangian dual by showing the tightness of the semidefinite
relaxation (SDR) of the considered problem. Then we propose an efficient
algorithm based on Lagrangian duality for solving the considered problem. The
proposed algorithm judiciously exploits the special structure of the
Karush-Kuhn-Tucker (KKT) conditions of the considered problem and finds the
solution that satisfies the KKT conditions via two fixed-point iterations. The
proposed algorithm is highly efficient (as evaluating the functions in both
fixed-point iterations are computationally cheap) and is guaranteed to find the
global solution of the problem. Simulation results show the efficiency and the
correctness of the proposed algorithm.

25
The categories of this paper are: patt-sol
11
The categories of this paper are: hep-lat
23
The categories of this paper are: solv-int
20
The categories of this paper are: acc-phys
17
The categories of this paper are: q-fin
26
The categories of this paper are: bayes-an
34
The categories of this paper are: chem-ph
4
The categories of this paper are: cond-mat
22
The categories of this paper are: chao-dyn
10
The categories of this paper are: q-bio
0
The categories of this paper are: hep-ph
29
The categories of this paper are: funct-an
16
The categories of this paper are: stat
28
The categories of this paper are: alg-geom
18
The categories of this paper are: econ
37
The categories of this paper are: supr-con