System Performance Evalutation Of LTE

The rapid development of personal communication techniques and markets leads to the fact that the demand of data service, such as multimedia message, on-line game, music download and mobile TV, will soon go beyond the ability provided by the wireless network today.Compared with WiFi and WiMAX, the network structure and access protocols of WCDMA/HSDPA are too complex although they have advantages in mobility and QoS aspects, which makes them fall behind in aspects of wireless spectrum efficiency and transmission delay.Therefore 3GPP build a Long Term Evolution plan (LTE)for WCDMA, which mainly include E-UTRAN and E-UTRA. E-UTRAN based on complete packet switching simplifies the network structure and minimize the delay. E-UTRA L1 adopts advanced techniques including MIMO-OFDM structure, AMC and HARQ to improve system throughput.In the thesis we built a semi-static system simulator based on SC-FDMA according to 3GPP specifications TR25.813, 25.814, 25.913, 25.914. The simulator comprises of cell layout, Wrap-around, large scale and small scale fading, power control, AMC, HARQ and scheduling. The simulation is composed of independent snapshots.We evaluated the frame structure of E-UTRA uplink to validate the system performance according to the design target of LTE. We also researched and compared the resource allocation schemes and scheduling algorithm.Results show that compared with WCDMA with E-DCH E-UTRA L1 can provide benefit of 200% on spectrum efficiency and edge user throughput rate, which complete satisfy the target and requirement of 3GPP. When the system adopts time-frequency combined resource allocation scheme better system throughput can be achieved. And proportional fair scheduling will improve the system spectrum efficiency and edge user throughput rate when compared with Round-Robin scheduling.