Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Rate-Splitting Robustness in Multi-Pair Massive MIMO Relay Systems   Relay systems improve both coverage and system capacity. Towards this
direction, full-duplex (FD) technology, being able to boost the spectral
efficiency by transmitting and receiving simultaneously on the same frequency
and time resources, is envisaged to play a key role in future networks.
However, its benefits come at the expense of self-interference (SI) from their
own transmit signal. At the same time, massive MIMO systems, bringing
unconventionally many antennas, emerge as a promising technology with huge
degrees-of-freedom (DoF). To this end, this paper considers a multi-pair
decode-and-forward FD relay channel, where the relay station is deployed with a
large number of antennas. Moreover, the rate-splitting (RS) transmission has
recently been shown to provide significant performance benefits in various
multi-user scenarios with imperfect channel state information at the
transmitter (CSIT). Engaging the RS approach, we employ the deterministic
equivalent (DE) analysis to derive the corresponding sum-rates in the presence
of interferences. Initially, numerical results demonstrate the robustness of RS
in half-duplex (HD) systems, since the achievable sum-rate increases without
bound, i.e., it does not saturate at high signal-to-noise ratio (SNR). Next, we
tackle the detrimental effect of SI in FD. In particular, and most importantly,
not only FD outperforms HD, but also RS enables increasing the range of SI over
which FD outperforms HD. Furthermore, increasing the number of relay station
antennas, RS appears to be more efficacious due to imperfect CSIT, since SI
decreases. Interestingly, increasing the number of users, the efficiency of RS
worsens and its implementation becomes less favorable under these conditions.
Finally, we verify that the proposed DEs, being accurate for a large number of
relay station antennas, are tight approximations even for realistic system
dimensions.

13
The categories of this paper are: quant-ph
14
The categories of this paper are: math-ph
28
The categories of this paper are: alg-geom
17
The categories of this paper are: q-fin
6
The categories of this paper are: astro-ph
0
The categories of this paper are: hep-ph
18
The categories of this paper are: econ
8
The categories of this paper are: hep-ex
25
The categories of this paper are: patt-sol
7
The categories of this paper are: hep-th
30
The categories of this paper are: q-alg
31
The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio
29
The categories of this paper are: funct-an
36
The categories of this paper are: cmp-lg
5
The categories of this paper are: gr-qc