Page 106 - ITU Journal, Future and evolving technologies - Volume 1 (2020), Issue 1, Inaugural issue
P. 106
ITU Journal on Future and Evolving Technologies, Volume 1 (2020), Issue 1
20
° with RIM with two different configurations in terms of
RIM, = 20
b
° beam width, and without RIM.
RIM, = 90
b
15 no RIM As a future piece of work, a factor that we have not consid-
Capacity [Gbps] 10 ered in this context is the presence of other sources and
interferences. We trust the integration of the RIM in the
system can improve the reduction of the interference im-
5 pact by properly addressing it. In order to account for this
point, we plan to extend the analytical model with the in-
terference factor and design RIM-based approaches that
reduce the impact of the interference.
0
0 100 200 300 400 500
Distance [m]
ACKNOWLEDGMENT
Fig. 10 – Capacity of the system with a rate set to 1 Gbps, in case of (i) a
∘ ∘
meta-surface with beam width = 20 and = 90 , and (ii) without This work is partially supported by the Exploratory Ac-
a meta-surface.
tion ETHICAM.
tion that is computed in real time and without error. In-
deed, in order to control the RIM and make it as a tunable
and intelligent meta-surface, we need to include an intel- REFERENCES
ligent logic, potentially based on a machine learning (ML)
[1] A. Nemati, Q. Wang, M. Hong, and J. Teng, “Tunable
approach to generate the correct configuration of the RIM
and reconfigurable meta-surfaces and metadevices,”
when an external change impacts on the system (e.g., the
in Opto-Electronic Advances, 01, 180009, 2018.
vehicle moves far away from the RSU and a new beam
needs to be calculated). ML approaches for systems based [2] C. Liaskos, A. Tsioliaridou, S. Nie, A. Pitsillides, S.
on RIM is a topic that is gaining more and more interest in Ioannidis, and I. F. Akyildiz, “On the Network-layer
recent times. Anyway, since we considered a mobile sce- Modeling and Configuration of Programmable Wire-
nario where some crucial parameters can be easily pre- less Environments,” in IEEE/ACM Transactions on
dicted (e.g., the velocity of the vehicle and the direction), Networking, vol. 27, no. 4, pp. 1696-1713, Aug.
we trust that the computation of a new configuration can 2019.
be calculated in real time and this should not impact too
[3] C. Liaskos, A. Tsioliaridou, A. Pitsillides, S. Ioanni-
much on the ideal performance of the system.
dis, and I. F. Akyildiz, “Using any Surface to Realize
a New Paradigm for Wireless Communications,” in
7. CONCLUSIONS Communications of the ACM, vol. 61 no. 11, pp. 30-
33, October 2018.
In this paper, we presented a multifunctional reconfig-
urable meta-surface based on the radiation pattern mod- [4] C. Liaskos, S. Nie, A. Tsioliaridou, A. Pitsillides, S.
ulation of the reflection coefficient. We designed a recon- Ioannidis, and I. F. Akyildiz, “A New Wireless Com-
figurable U-shaped unit cell using a pin diode via a hole, munication Paradigm through Software-controlled
∘
that allows to obtain a 180 -phase difference between ON Meta-surfaces,” in IEEE Communications Magazine,
and OFF states. The proposed RIM structure has been de- vol. 56, no. 9, pp. 162-169, September 2018.
signed for multifunctional behavior such as coding and
beam steering, considering a 10×10 meta-surface loaded [5] L. La Spada, V. Loscrí, and A.M. Vegni, “Meta-Surface
Structure Design and Channel Modelling for THz
with PIN diodes.
Band Communications,” in Proc. of INFOCOM 2019
Simulation results have been carried out in order to val- Workshop, 1st IEEE Workshop on Ultra-High Broad-
idate the proposed RIM in a vehicular scenario, for data band Terahertz Communication for 5G and Beyond
transmission via the V2X mode. The instantaneous data Networks (UBTCN 2019), April 29-May 2, Paris,
rate has been obtained, as a function of the beam width, France.
the vehicle speed and the distance. As expected, the lower
[6] A. Taibi, A. Durant, V. Loscrí, A.M. Vegni, and L.
the beam width is, the higher the data rate is; addition-
La Spada, “Controlling Light by Curvilinear Meta-
ally, the lower the vehicle speed is, the higher the data
Surfaces,” in Proc. of ACM Nanocom 2019, Septem-
rate is. Same consideration occurs for the distance. In or-
ber 25-27, 2019, Dublin, Ireland.
der to assess the effectiveness of the RIM integration in
the vehicular communication system, we have derived the [7] J. Dickmann et al., “Automotive radar the key tech-
outage probability for a specific target QoS in terms of an nology for autonomous driving: From detection and
instantaneous rate. We also have computed the capacity rangingtoenvironmentalunderstanding,” inProc.of
based on the outage probability and we have compared 2016 IEEE Radar Conference (RadarConf), Philadel-
both the outage and the capacity for a system equipped phia, PA, 2016, pp. 1-6.
86 © International Telecommunication Union, 2020