Advanced 3G systems like LTE and 802.16e (WiMax) use OFDM. So do all potential 4G systems like LTE-Advanced and 802.16m. Even digital video broadcasts are now OFDM. Prior 3G standards, like UMTS and EVDO, predominantly used CDMA Why has this shift occurred? Do you feel it is for the better? What specific cross-layer optimizations are unique to OFDMA? How have these affected this migration? Why did standards such as GSM and TDMA flourish before? Would a different solution have made better sense? ◦What trends do you see?APA format
Part B Different access methods, such as OFDMA, SDMA, TDMA, CDMA, and FDMA, rely on cross-layer optimization to different degrees. The most common cross-layer issues are scheduling modulation type and setting power control. Complete the following for your assignment: Describe the advantages of each access method in doing cross-layer optimization correctly.