Research 3GPP LTE Up Link Key Technology

Nowadays telecommunications market is developing quickly and telecommunications technologies are improving rapidly. To adapt to and meet the demands of the mobile communications market, 3GPP/3GPP2 has come up with the project of 3GPP Long Term Evolution and 3GPP2 Air Interface Evolution,which is also called E3G. E3G takes OFDM/OFDMA as its core technologies, which enable its compatibility with and evolution of current 3G telecommunicatios sytems, and its closeness with B3G vision. However, the very high Peak-to-Average Power Ratio(PAPR) of OFDM increases dramatically the cost and power consumption of terminals, so it is not suitable to use OFDM/OFDMA in Up Link(UL) technology in future mobile communications systems. Therefore DFT-SOFDM (DFT Spread OFDM), an OFDM-based single carrier technology that could effectively decrease the PAPR in signal transmission of OFDM and therefore meet the requrement of UL access technology in future mobile communications systems, is put forward in this paper.This article is divided into 3 parts. In the first part, describing the B3G and E3G's latest evolution, and key technologies. In the second part, the design and development of the simulation platform for OFDM-based E3G key technologies is introduced. The design and development for the simulation platform comprises 2 phases: the development of the link-level simulation platform and the development of the system-level simulation platform. In the third part, the research result for LTE UL,mainly DFT-SOFDM technology, are summerized,with carrying out the simulation platform.