2 research outputs found
A Dual Sampling Communication Method in Wireless Networks.
PhD ThesisAs mobile wireless data traffic is increasing significantly, the development direction
for wireless networks is focusing on very high data rates, extremely low latency, with
a large number of connected devices and a reduction in energy usage. To satisfy the
rapid rise in user and traffic capacity, raises challenges given the limited bandwidth
resource. The main purpose for this research is to find ways to improve spectral efficiency,
data transmission rate, and reduce latency. Simultaneous wireless transmissions
happening in the same frequency band can help alleviate demand on transmission
slots, with methods like network coding to support decoding at the end terminals.
However, in general, signal asynchrony harms the transmission performance significantly.
The main contribution of this research is the proposal of a Dual Sampling (DS)
method, which aims to relieve the impact of signal asynchrony on simultaneous transmissions.
The key concept behind the DS method is sampling twice within each symbol
period to handle overlapping signals for successful decoding. Simulation results confirm
that it manages to support simultaneous transmissions. Moreover, the DS method
is implemented in both Information-Centric Networks (ICN) and Unmanned Aerial
Vehicles (UAVs) aided wireless networks. Additionally, for ICN, a Cache Migration
Protocol (CMP) is proposed to support simultaneous transmissions which reduces the
transmission latency. While for UAV-aided wireless networks, by exploiting the DS
method, simultaneous transmissions are supported resulting in better optimal max-min
throughput along supported by suitableUAV flight trajectory planning. By demonstrating
the performance gain in the application scenarios of ICN and UAV-aided wireless
networks, the DS method can be regarded as an optional promising transmission mechanism
when communicating with multiple users simultaneously
Multi-Scale Simulation of Complex Systems: A Perspective of Integrating Knowledge and Data
Complex system simulation has been playing an irreplaceable role in
understanding, predicting, and controlling diverse complex systems. In the past
few decades, the multi-scale simulation technique has drawn increasing
attention for its remarkable ability to overcome the challenges of complex
system simulation with unknown mechanisms and expensive computational costs. In
this survey, we will systematically review the literature on multi-scale
simulation of complex systems from the perspective of knowledge and data.
Firstly, we will present background knowledge about simulating complex system
simulation and the scales in complex systems. Then, we divide the main
objectives of multi-scale modeling and simulation into five categories by
considering scenarios with clear scale and scenarios with unclear scale,
respectively. After summarizing the general methods for multi-scale simulation
based on the clues of knowledge and data, we introduce the adopted methods to
achieve different objectives. Finally, we introduce the applications of
multi-scale simulation in typical matter systems and social systems