الفهرس 
Chapter 1 IntroductionOnly 14 pages are availabe for public view
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Abstract
The spectrum scarcity is the biggest problem in the wireless
communication system that resulting from the wireless devices
increments and the new advanced technologies that required high data
rate transmission. Therefore, some communication techniques Device to
Device (D2D) communication systems were proposed to overcome this
problem.
D2D communication in the cellular networks is characterized as an
immediate communication between two mobile users without crossing
the Base Station (BS) or the core center within either the cellular
spectrum (licensed spectrum) that called inband D2D communication or
unlicensed spectrum that called outband D2D communication. The most
significant feature of utilizing the D2D communication is the data rate
transmission enhancement instead of utilizing the conventional
communication. So, it can extremely increase the communication system
spectral efficiency. In addition, the throughput, energy efficiency, delay,
and fairness of the communication link can also be enhanced. The
cooperative D2D communication network is applied in the cellular
spectrum system, where one of the D2D users acts as a relay to the
cellular user (CU). Therefore, the CU data which suffers from the noise
and the fading environment can be sent to the destination with the
maximum signal to noise ratio. In this moment, the CU dedicates a
special part of the cellular spectrum to the D2D users as a reward to
establish D2D communication.
VI
In our research, we focused on the cooperative D2D communication
networks where the electronic relay is proposed to act as a relay to the
CU. Electronic relay is a selective relay scheme that consists of three
hybrid cooperative relay schemes. The three types of cooperative
diversities are Compress and forward relay (CF) with Wyner Ziv coding,
Decode and Forward relay (DF) with LDPC code and Amplify and
Forward relay (AF) with different gain. The comparisons between the
proposed relay scheme and the other previous schemes are illustrated.
In fact, the electronic relay is selected from the available D2D pair in
cellular network. Therefore, the interference on the CU communication
resulting from D2D communication is appeared and the performance
between two links (D2D & Cellular) is reduced. Thereby, two
interference management and interference avoidance techniques in
inband underlay D2D communication networks are proposed to overcome
this problem. The proposed schemes is called ERIMA scheme. ERIMA
indicates to the Electronic Relay with Interference Management and
Interference Avoidance scheme.
Simulation results are also provided to verify the tightness of the
derived results. Therefore, two simulation parameters are utilized in order
to evaluate the receiver performance and the channel performance called,
bit error rate (BER) and outage probability, respectively. Moreover, the
proposed techniques are compared with the other previous research works
in terms of the two parameters. Furthermore, the effect of increasing the
electronic relay number over the cellular spectrum is studied.
Moreover, we propose the cohabitation of the three important
technologies that have been raised for the wireless communication,
called, device and device communication and massive MIMO (multi
VII
input-multi output) with one of the advanced cooperative relay networks
called electronic relay network. The possible advantages of those
technologies are known separately, but the cohabitation with the relay
network has not been sufficiently introduced. Multiple antennas at the
electronic relay and massive MIMO antenna at the destination are utilized
to serve multiple cellular users. The signal to interference plus noise ratio
is derived, and thereby the average sum rate (ASR) is obtained.
Moreover, the ASR is derived as a function of the destination antennas
number, electronic relay antenna number, different numbers of CU users
and the D2D user density within a certain cellular spectrum.
Finally, the applications of the electronic relay in the electronic field are
introduced in details. Also, some electronic circuits that are associated
with the relay are explained.