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中继(relay)技术是LTE-Advanced(LTE-A)系统中引入的关键技术之一,它能够改善通信链路的通信质量,提高系统容量和扩大小区覆盖范围。在此主要研究了LTE-A下行链路中基于两跳固定中继的协作通信技术,并以协作通信中常用的放大转发(AF,Amplify Forward)和译码转发(DF,DecodeForward)协作方式为重点,研究了引入中继节点(RN,Relay Node)后LTE-A系统中下行通信链路的性能,并对AF和DF两种协作方式进行了比较,由仿真结果可知在一定条件下DF协作方式的性能优于AF协作方式。
Relay technology is one of the key technologies introduced in the LTE-Advanced (LTE-A) system. It can improve the communication quality of the communication link, increase the system capacity and extend the coverage of the cell. In this paper, the cooperative communication technology based on two-hop fixed relay in the LTE-A downlink is mainly studied, and the commonly used collaborative communication AF (Amplify Forward) and Decode Forward (DF) cooperation modes are Focuses on the performance of the downlink communication link in the LTE-A system after the introduction of a relay node (RN), and compares the two cooperation modes of the AF and the DF. The simulation results show that under certain conditions, the DF cooperation The performance of the method is better than the AF cooperation method.