Electronic Theses and Dissertation

Sistem komunikasi kooperatif pada jaringan nirkabel merupakan topik penelitian
yang sedang hangat di bidang telekomunikasi saat ini. Hal ini disebabkan
keunggulannya dalam memperluas area cakupan, dan kualitas layanan. Secara
umum, penelitian tentang sistem komunikasi kooperatif hanya mempertimbangkan
sifat transceiver (pemancar/penerima) yang ideal. Akan tetapi pada praktiknya,
suatu transceiver memiliki sifat ketidak-idealan (hardware impairment) berupa
distorsi, ateunuasi dan noise yang menyebabkan penurunan kinerja sistem. Distorsi
pada tranceiver yang tidak ideal dapat disebabkan oleh salah satu atau lebih dari
ketiga faktor berikut yaitu: derau fasa (phase noise), ketidakseimbangan In-phase
and Quadrature (I/Q) atau disebut dengan I/Q imbalance, dan High Power
Amplifier (HPA). Penelitian ini menganalisis pengaruh ketidak-idealan transceiver
yang disebabkan oleh ketiga faktor di atas terhadap keterbatasan kinerja sistem
komunikasi kooperatif multi-hop dengan protokol Amplify-and-Forward (AF) dan
Decode and Forward (DF) melalui kanal Nakagami-m. Kinerja dianalisis dengan
menggunakan parameter outage probability, throughput, dan Error Vector
Magnitude (EVM) sebagai parameter untuk menentukan batasan dasar kinerja.
Hasil simulasi menunjukkan kinerja dari sistem komunikasi kooperatif multi-hop
berupa outage probability dan throughput dengan transceiver tidak ideal, dapat
ditingkatkan dengan menambahkan jumlah hop menggunakan protokol AF, dengan
gain kanal yang bervariasi (variable gain). Selain itu, hasil simulasi menunjukkan
keterbatasan kinerja dari sistem komunikasi kooperatif dibatasi oleh level
impairment berupa nilai EVM yang ada pada transceiver.

Kata kunci: Sistem komunikasi kooperatif, Multi-hop, Impairment, Transceiver
tidak ideal, AF, DF, EVM.

Cooperative communication systems on wireless networks are a hot topic of research in the field of telecommunications today. This is due to its superiority in expanding coverage areas, and quality of service. In general, research on cooperative communication systems only considers the ideal nature of a transceiver. But in practice, a transceiver has a hardware impairment in the form of distortion that causes a decrease in system performance. Distortion in the tranceiver that is not ideal can be caused by one or more of the following three factors: phase noise, inphase and quadrature imbalance (I/Q) or called I /Q imbalance, and High Power Amplifier (HPA). The study analyzed the effect of transceiver inaccuracies caused by the above three factors on the limitations of the performance of multi-hop cooperative communication systems with amplify-and-forward (AF) and decode and forward (DF) protocols through the Nakagami-m channel. Performance is analyzed using outage probability, throughput, and Error Vector Magnitude (EVM) parameters as parameters to determine basic performance limitations. The simulation results showed the performance of the multi-hop cooperative communication system in the form of outage probability and throughput with a transceiver is not ideal, can be increased by adding the number of hops using the AF protocol, with variable gain. In addition, the simulation results showed that the performance limitations of the cooperative communication system were limited by impairment levels in the form of EVM values in transceivers. Keywords: Cooperative communication systems, Multi-hop, Impairment, Transceiver are not ideal, Amplify-and-Forward (AF), Decode and Forward (DF), Error Vector Magnitude (EVM).