Research On The Key Technology Of Uplink In LTE Physical Layer

In order to compete with WIMAX and other wireless broadband technology and satisfy future mobile communication demand, International organization for standardization 3GPP initiated Long Term Evolution (LTE) technology standardization work at the end of 2004, also UMTS Long Term Evolution technology research and thus fulfill smoothed transition from 3G to E3G and 4G.. The fundamental targets for LTE concern increased data rates, improved system capacity and coverage range, reduced lateney as well as reduced operator costs. LTE consolidate traditional cellular mobile communication leading status and improve IPR pattern of communication industry at present as by adopting OFDM, MIMO and so on new technology widely, so the study of LTE technology is of great significance.This thesis focuses on the study of physical layer uplink.The main contents are listed as followings: Firstly, summarizing the LTE key performance index and Latest evolution, expatiating OFDMA , SC-FDMA and MIMO theory of the key technology of physical layer uplink, analyzing and comparing three schemes for SC-FDMA, IFDMA, DFT-S-OFDMA and DFT-S-GMC. Secondly, the design and implement of the simulation platform for OFDM-based LTE uplink was introduced, the structure of simulation platform as well as part of module principle and plan flow chart were given. Finally, physical layer uplink key technology based the simulation platform was researched, OFDMA and SC-FDMA in its time-domain and frequency-domain were analyzed in this thesis. The performance analysis prove the benefits of SC-FDMA in terms of both high-power amplifier (HPA) output back-off and bit error rate (BER) on selective channels by providng a new analysis of two different multiple access schemes and comparing their uplink transmission performance. The MAI performance of DFT-S-GMC and DFT-S-OFDM was analyzed and compared by simulation as both of them have low PAPR. Analysis and simulation results show that MAI robustness of DFT-S-GMC is better than that of DFT-S-OFDM. Moreover, combining the merits of SC-FDMA and virsual MIMO, SC-FDMA-Virsual MIMO theory was analyzed.