Research On The Key Technology Of Physical Layer In Lte-Advanced Uplink

In order to keep competitive advantage in the future mobile communication technology and meet requirements of IMT-Advanced standard, the3GPP organization launched LTE-Advanced standardization research which is based on LTE standard. LTE-Advanced technology does not change the core technology of the LTE standard physical layer, but only make some functional and technical enhancements on the basis of the LTE. The enhancements of Uplink physical layer include enhanced multiple access technology and enhanced multi-antenna technology.There are many factors, especially the multipath interference caused by frequency selective fading, seriously affect the channel quality while signals pass the wireless channels. So the uplink receiver must take corresponding measures to offset the impact, such as channel equalization. On the other hand, in order to improve the system capacity, LTE-Advanced uplink using multiple antenna technique, support single user MIMO (SU-MIMO). For the multiple antenna technology system, multiple antenna detection technology should be used on the receiver to separate the original data stream. Therefore, multiple antenna detection and channel equalization technology are both very important in the study of LTE-Advanced uplink. This paper studied the uplink physical layer key technologies of LTE-Advanced and established the uplink simulation platform and then focused on the uplink receiver multiple antenna detection with frequency domain equalization. The main research contents include:Firstly, we studied the key technologies of LTE-Advanced uplink physical layer, included the research of the enhanced uplink multiple access technology according to uplink resource allocation characteristics; the research of the enhanced uplink multiple antenna technology according to the uplink multi-streaming transmission; redesigned the uplink pilot signal which is appropriate for LTE-Advanced system, and then studied the channel estimation technique based on pilot signal. Then build PUSCH link level simulation platform according to3GPP LTE-Advanced release10 protocols. We designed each module of transmitter and receiver in detail according to the signal processing in the link. Then we researched frequency domain equalization algorithm. Simulated the ZF, MMSE and DFE equalization algorithm and compared algorithm performance in LTE-Advanced system. And then introduced the IB-DFE equalization algorithm to LTE-Advanced system, and gave out the mathematical derivation and simulation based on MATLAB. Lastly, we researched MIMO detection in LTE-Advanced uplink receiver. In this paper, we simulated the linear ZF and MMSE standards as well as the nonlinear V-BLAST algorithm, and gave out a detection algorithm which was combined by IB-DFE algorithm and the V-BLAST algorithm, then gave out the mathematical derivation and simulation based on MATLAB.