Cebrail ÇIFLIKLI1
, Waeal AL-OBAIDI2
and Musaab AL-OBAIDI2
1Electronic Tech. Program/ Electronics and Automation,
Erciyes University, Kayseri, Turkey
2Faculty of Electrical and Electronic Engineering,
Erciyes University, Kayseri, Turkey
ABSTRACT
Wireless communication faces adversities due to noise, fading, and path loss. Multiple-Input MultipleOutput (MIMO) systems are used to overcome individual fading effect by employing transmit diversity. Duo
to user single-antenna, Cooperation between at least two users is able to provide spatial diversity. This
paper presents the evaluation of the performances of the Amplify and Forward (AF) cooperative system for
different relay positions using several network topologies over Rayleigh and Rician fading channel.
Furthermore, we present the performances of AF cooperative system with various power allocation. The
results show that cooperative communication with convolutional coding shows an outperformance
compared to the non-convolutional, which is a promising solution for high data-rate networks such as
(WSN), Ad hoc, (IoT), and even mobile networks. When topologies are compared, the simulation shows
that, linear topology offers the best BER performance, in contrast when the relay acts as source and the
source take the relay place, the analysis result shows that, equilateral triangle topology has the best BER
performance and stability, and the system performance with inter-user Rician fading channel is better than
the performance of the system with inter-user Rayleigh fading channel.
KEYWORDS
MIMO, AF cooperative, convolutional coding, path loss, power allocation, fading.
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