255 research outputs found
On Reliability of Underwater Magnetic Induction Communications with Tri-Axis Coils
Underwater magnetic induction communications (UWMICs) provide a low-power and
high-throughput solution for autonomous underwater vehicles (AUVs), which are
envisioned to explore and monitor the underwater environment. UWMIC with
tri-axis coils increases the reliability of the wireless channel by exploring
the coil orientation diversity. However, the UWMIC channel is different from
typical fading channels and the mutual inductance information (MII) is not
always available. It is not clear the performance of the tri-axis coil MIMO
without MII. Also, its performances with multiple users have not been
investigated. In this paper, we analyze the reliability and multiplexing gain
of UWMICs with tri-axis coils by using coil selection. We optimally select the
transmit and receive coils to reduce the computation complexity and power
consumption and explore the diversity for multiple users. We find that without
using all the coils and MII, we can still achieve reliability. Also, the
multiplexing gain of UWMIC without MII is 5dB smaller than typical terrestrial
fading channels. The results of this paper provide a more power-efficient way
to use UWMICs with tri-axis coils
Mobility-Aware Computation Offloading for Swarm Robotics using Deep Reinforcement Learning
Swarm robotics is envisioned to automate a large number of dirty, dangerous,
and dull tasks. Robots have limited energy, computation capability, and
communication resources. Therefore, current swarm robotics have a small number
of robots, which can only provide limited spatio-temporal information. In this
paper, we propose to leverage the mobile edge computing to alleviate the
computation burden. We develop an effective solution based on a mobility-aware
deep reinforcement learning model at the edge server side for computing
scheduling and resource. Our results show that the proposed approach can meet
delay requirements and guarantee computation precision by using minimum robot
energy
Semi-supervised MIMO Detection Using Cycle-consistent Generative Adversarial Network
In this paper, a new semi-supervised deep multiple-input multiple-output
(MIMO) detection approach using a cycle-consistent generative adversarial
network (CycleGAN) is proposed for communication systems without any prior
knowledge of underlying channel distributions. Specifically, we propose the
CycleGAN detector by constructing a bidirectional loop of two modified least
squares generative adversarial networks (LS-GAN). The forward LS-GAN learns to
model the transmission process, while the backward LS-GAN learns to detect the
received signals. By optimizing the cycle-consistency of the transmitted and
received signals through this loop, the proposed method is trained online and
semi-supervisedly using both the pilots and the received payload data. As such,
the demand on labelled training dataset is considerably controlled, and thus
the overhead is effectively reduced. Numerical results show that the proposed
CycleGAN detector achieves better performance in terms of both bit error-rate
(BER) and achievable rate than existing semi-blind deep learning (DL) detection
methods as well as conventional linear detectors, especially when considering
signal distortion due to the nonlinearity of power amplifiers (PA) at the
transmitter
Mulsemedia Communication Research Challenges for Metaverse in 6G Wireless Systems
Although humans have five basic senses, sight, hearing, touch, smell, and
taste, most multimedia systems in current systems only capture two of them,
namely, sight and hearing. With the development of the metaverse and related
technologies, there is a growing need for a more immersive media format that
leverages all human senses. Multisensory media(Mulsemedia) that can stimulate
multiple senses will play a critical role in the near future. This paper
provides an overview of the history, background, use cases, existing research,
devices, and standards of mulsemedia. Emerging mulsemedia technologies such as
Extended Reality (XR) and Holographic-Type Communication (HTC) are introduced.
Additionally, the challenges in mulsemedia research from the perspective of
wireless communication and networking are discussed. The potential of 6G
wireless systems to address these challenges is highlighted, and several
research directions that can advance mulsemedia communications are identified
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