Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Symbol-Level Precoding Made Practical for Multi-Level Modulations via
  Block-Level Rescaling   In this paper, we propose an interference exploitation symbol-level precoding
(SLP) method for multi-level modulations via an in-block power allocation
scheme to greatly reduce the signaling overhead. Existing SLP approaches
require the symbol-level broadcast of the rescaling factor to the users for
correct demodulation, which hinders the practical implementation of SLP. The
proposed approach allows a block-level broadcast of the rescaling factor as
done in traditional block-level precoding, greatly reducing the signaling
overhead for SLP without sacrificing the performance. Our derivations further
show that the proposed in-block power allocation enjoys an exact closed-form
solution and thus does not increase the complexity at the base station (BS). In
addition to the significant alleviation of the signaling overhead validated by
the effective throughput result, numerical results demonstrate that the
proposed power allocation approach also improves the error-rate performance of
the existing SLP. Accordingly, the proposed approach enables the practical use
of SLP in multi-level modulations.

12
The categories of this paper are: nucl-th
8
The categories of this paper are: hep-ex
30
The categories of this paper are: q-alg
11
The categories of this paper are: hep-lat
5
The categories of this paper are: gr-qc
27
The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph
14
The categories of this paper are: math-ph
10
The categories of this paper are: q-bio
21
The categories of this paper are: adap-org
37
The categories of this paper are: supr-con
20
The categories of this paper are: acc-phys
9
The categories of this paper are: nlin
15
The categories of this paper are: nucl-ex
26
The categories of this paper are: bayes-an
18
The categories of this paper are: econ