Browsing by Author "Tura, Ömer"

Filter results by typing the first few letters
Now showing 1 - 1 of 1
  • No Thumbnail Available
    Item
    Simulation based performance analysis of LTE systems
    (Bahçeşehir Üniversitesi Fen Bilimleri Enstitüsü, 2012-08) Tura, Ömer; Soysal, Alkan
    In this Master’s thesis, a performance analysis of 3GPP Long Term Evolution (LTE) Release 8 is provided. LTE is the evolution of the Universal Mobile Telecommuni-cations System (UMTS). It allows mobile users to reach high data rates and access Internet through their devices (mobile telephones, laptop, tablet PC, etc.). LTE intends to deliver rich multimedia services (Full HD video stream, video call...) to next generation users. LTE mobile broadband technology has been used in more than 30 countries and by 70 operators and in the coming years it will be widely used in many countries with more than 100 LTE user devices such as notebooks, tablet PCs, smartphones, hotspots, gaming devices and video cameras. The Long Term Evolution provides high data rates and can operate using different bandwidths ranging from 1.4MHz up to 20MHz. Furthermore LTE supports Multiple Input Multiple Output (MIMO) systems up to four antennas and can reach higher peak data rates than Single Input Single Output (SISO) systems (326 Mb/s in the DL and 150 Mb/s in the UL with 4 antennas). LTE supports transmit diversity and spatial multiplexing with multi antenna technology to have more reliable communication and to increase the data rate respectively. LTE also improves system capacity and coverage by using more bandwidth and different frequency bands and also it reduces operating costs with IP based infrastructure. The two main frequency bands that will be used in LTE are 2600 MHz and 800 MHz bands. The 2600 MHz band is a choice for more capacity since it provides 190 MHz bandwidth and the 800 MHz band is more ideal for coverage since its wavelength is higher than the other. In LTE, resource allocation is another important technique to reach that much high rates. The resources (time and frequency) can be scheduled to users fairly or just the user with the best channel condition can be scheduled. In this study, the Round Robin, the Proportional Fair and the Best CQI scheduling algorithms have been considered. In this Master’s thesis, we compared 800 MHz and 2600 MHz frequency bands in terms of coverage and examined the impact of the scheduling algorithms and the MIMO modes on the average cell and cell edge throughputs for the different environments.