MILLIMETER WAVE CHANNEL MODELING FOR 5th GENERATION MOBILE COMMUNICATION SYSTEMS

Abstract

5N mobil haberleşme, 32 GHz, milimetre dalga, kanal modelleme, geniş ölçekli sönümlenme parametreleri. ABSTRACT

Fifth generation (5G) mobile communication technology supports people to access and share data in various scenarios with high speed and low latency. Compared to the current fourth generation (4G) technology, a 1000-fold improvement in system capacity, 100 times in data rate, 10 to 100 times in energy efficiency and 3 to 5 times in spectral efficiency is expected. One of the most important and promising technologies for 5G is millimeter wave communication. With its large bandwidth, the millimeter waveband can easily support data rates of several gigabits per second. However, in high frequency propagation, high path loss occurs. Also, atmospheric effects and vegetation losses are seen as obstacles to the development of 5G mobile communication systems. According to measurements, if small cells with a radius of 100 to 200 m are used in cellular access, millimeter wave systems may also perform well to reduce path loss.

This study was carried out in a small cell for the 5G cellular communication system, on the 4th floor of Karabuk University Faculty of Engineering, in an indoor office environment. Wideband directional propagation measurements were made between the frequencies of 31.5 to 32.5 GHz in the millimeter waveband and presented in detail. More than 82,000 power delay profiles were obtained at each measurement point. A ray trace-based software has been used. During the measurements, electronically steerable antennas with vertical polarization were used in both the transmitting part and the receiving part. Omnidirectional antenna in the transmitting part and directional horn antenna with 23° beamwidth in the receiving part was preferred. The delay resolution was measured as 1 ns. As a result of ray trace-based measurements, large-scale fading parameters such as path loss, shadow fading, delay spread, angular spread, power angular spectrum, number of clusters and Ricean K factor of a communication channel in the indoor office environment were obtained.

The center frequency was chosen as 32 GHz because it is located in the millimeter wave band and gives the best result in millimeter wave imaging applications. Bandwidth has been selected as 1 GHz in order to reach data speeds such as Gbps. According to the results obtained, there are no big differences between 32 GHz band and sub 6 GHz band in terms of propagation mechanism. Reflection, diffraction and scattering in the 32 GHz band caused multiple paths in the receiver, as in the sub 6 GHz band. The results obtained in this study at 32 GHz are of great importance in that 5G cellular communication systems are applicable in link and system level simulations. In addition, the results obtained will be shared with the relevant departments of the Information Technologies and Communications Authority and with the Scientific and Technological Research Council of Turkey Center of Research for Advanced Technologies of Informatics and Information Security project teams and efforts will be carried out to produce the national common benefit.