Analysis and comparison of existing high data-rate mobil technologies (HSPA - WIMAX and Wi-Fi )

The wireless communication basically can be defined as transfer of information without use of any kind of cable media. Electromagnetic waves used for wireless transmission over the air interface The model of data communication with electromagnetic waves requires three basic steps. The information modulated onto electromagnetic waves via different modulation techniques(GMSK, 4PSK, 16QAM, 64QAM) then distributed the users via different multiple access techniques (TDMA, FDMA, CDMA, OFDMA). Transmitted data recovered at receiver side by applying these steps in reverse order (de-multiple access, demultilpexing and demodulation).Today, there are multiple technologies emerged from different standarts for data transmission over wireless access. Furthermore, many new standarts being defined for future work to supply the demand for higher data rates. In this thesis, three prominent technologies that currently operational, is chosen for analysis and comparison in regarding to their physical layer properties and air interface effectiveness. All of these technologies is designed and evolved for their primary usage area (voice and video communicaton for cellular systems, long range data for WiMAX and short range data for WiFi). The primary advancement areas is achieving better spectrum efficiency and higher data rates per sector. This demand causes convergence of air interface properties and increases similarities of radio access methods in near future.The objective of this thesis, making an analysis of different existing high data-rate wireless broadband technologies in physical layer aspects. It is necessary to avoid a strict comparison for these technologies since the technological aspects offers their convergence point is very similar in physical layer properties.