Research And Implementation Of LTE-A Uplink Physical Layer Algorithm

The Long Term Evolution-Advanced(LTE-A)project is an evolution of 3G communication technology.It changes and enhances many technologies of 3G and adopts key technologies such as OFDM and MIMO to improve system transmission rate,increase cell capacity,and reduce System delay,improve the edge of the cell user's performance.The physical layer is the bottom layer of the entire LTE protocol stack.The physical layer algorithm will directly affect the performance and capacity of the uplink channel.This article focuses on the LTE-A uplink physical layer algorithm research and implementation.Based on the "T-LTE Test and Development of TD-LTE-Advanced Multi-Mode and Multi-Frequency Terminal Protocol" project(20142X030010257),a large variety of channel estimation algorithms are researched and a channel estimation algorithm based on phase compensation is proposed.By analyzing the result of channel estimation,better estimation results are obtained,which can better track the change of the wireless channel and effectively improve the receiver performance.Secondly,the thesis has carried on the modular design to the sending and receiving process of LTE uplink,and validated the design scheme through the development platform of TMS320C6670.The result proves that the design is more concise and error-prone,which provides certainty for subsequent development and improvement s help.The article first introduces the basic concepts of LTE-A and its physical layer,signal processing flow.For the uplink characteristics,the key technologies of LTE-A are studied,including MIMO,OFDM and so on.A channel estimation algorithm based on phase compensation is proposed.The simulation results show that the algorithm can effectively reduce the influence of frequency offset on the estimation error of the output signal.Then the article studies the frame structure of LTE-A system and modulates the uplink physical layer of LTE-A.The uplink process is divided into source coding,modulation,signal generation,resource mapping,channel Equalization,descramble and solution of CRC and other modules,algorithm design for each module,and gives a LTE-A uplink DSP implementation.Finally described in detail under the DSP integrated development environment CCS5.5 TMS320C6670 platform based on the realization process.The design content of this article can provide some help for the realization of the uplink in other modes and the development and verification.