C-RAN协作通信系统中基于正交预编码的同步算法  

A Synchronization Algorithm Based on Orthogonal Pre-coding in C-RAN Cooperative Communication System

作　　者：余翔[1] 曾银强 郑寒冰[1] 

机构地区：[1]重庆邮电大学通信与信息工程学院,重庆400065

出　　处：《电讯技术》2016年第3期241-245,共5页Telecommunication Engineering

基　　金：国家科技重大专项(2014ZX03003004-003)~~

摘　　要：在C-RAN(Centralized,Cooperative,Cloud RAN)无线网络架构中,协作多点传输受到符号定时偏差和载波频率偏差的影响。为了降低联合传输协作系统对异步信号的敏感性,将正交预编码的同步算法应用到联合传输协作系统中。首先,发射机发送经过重复编码和正交预编码矩阵处理后的数据信息;然后,接收机利用特定的接收矩阵,实现分离相互叠加的异步协作信号;最后,完成对协作信号载波频率偏差和符号定时偏差的估计和补偿。理论分析和仿真结果表明:该方法能够有效解决协作传输中信号异步问题,改善系统性能。Cooperative multi-point processing( CoMP) technology is influenced by symbol timing offset and carrier frequency offset in the wireless network infrastructure centralized, cooperative, cloud radio access network( C-RAN) . In order to reduce the sensitivity to asynchronous signal in joint transmission system, the orthogonal pre-coding synchronization algorithm is used to mitigate the effect of asynchronous signals. Firstly,the transmitter sends data which has been processed by repetition coding and orthogonal pre-coding matrix. Then,the receiver estimates and compensates the frequency and time offset for the cooperative sig-nals which been separated by a particular accepting matrix. Simulation results demonstrate that this method can effectively solve the problem of asynchronous transmission and improve the performance of collaborative transmission systems.

关 键 词：C-RAN 协作多点传输 正交预编码 同步算法 

分 类 号：TN911.22[电子电信—通信与信息系统]