Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Rate-Splitting Multiple Access for Multi-antenna Downlink Communication
  Systems: Spectral and Energy Efficiency Tradeoff   Rate-splitting (RS) has recently been recognized as a promising
physical-layer technique for multi-antenna broadcast channels (BC). Due to its
ability to partially decode the interference and partially treat the remaining
interference as noise, RS is an enabler for a powerful multiple access, namely
rate-splitting multiple access (RSMA), that has been shown to achieve higher
spectral efficiency (SE) and energy efficiency (EE) than both space division
multiple access (SDMA) and non-orthogonal multiple access (NOMA) in a wide
range of user deployments and network loads. As SE maximization and EE
maximization are two conflicting objectives, the study of the tradeoff between
the two criteria is of particular interest. In this work, we address the SE-EE
tradeoff by studying the joint SE and EE maximization problem of RSMA in
multiple input single output (MISO) BC with rate-dependent circuit power
consumption at the transmitter. To tackle the challenges coming from multiple
objective functions and rate-dependent circuit power consumption, we first
propose two methods to transform the original problem into a single-objective
problem, namely, weighted-sum method and weighted-power method. A successive
convex approximation (SCA)-based algorithm is then proposed to jointly optimize
the precoders and RS message split of the transformed problem. Numerical
results show that our algorithm converges much faster than existing algorithms.
In addition, the performance of RS is superior to or equal to non-RS strategy
in terms of both SE and EE and their tradeoff.

20
The categories of this paper are: acc-phys
28
The categories of this paper are: alg-geom
12
The categories of this paper are: nucl-th
23
The categories of this paper are: solv-int
7
The categories of this paper are: hep-th
26
The categories of this paper are: bayes-an
10
The categories of this paper are: q-bio
33
The categories of this paper are: plasm-ph
27
The categories of this paper are: comp-gas
18
The categories of this paper are: econ
24
The categories of this paper are: dg-ga
13
The categories of this paper are: quant-ph
30
The categories of this paper are: q-alg
37
The categories of this paper are: supr-con
22
The categories of this paper are: chao-dyn
16
The categories of this paper are: stat