| 摘要: |
| 针对5G主同步信号检测对频率偏移异常敏感导致移动通信系统无法实现精确的定时同步问题，提出了差分与快速频域相关联合检测算法。该算法首先对本地信号和接收信号进行差分处理，以降低频偏影响；其次基于快速频域相关算法，将时域互相关转换为频域相乘运算，降低计算复杂度；最后通过比对相关峰值检测同步点。算法分析和仿真结果表明，在频偏较大的条件下，改进算法可精确、快速地检测同步点。相比于传统互相关算法，该算法的运算复杂度降低了89.99%，频偏值为0.6时，正确检测概率接近0.9。 |
| 关键词: 5G系统 主同步信号 定时同步 差分处理 快速频域相关 |
| DOI： |
|
| 基金项目:重庆市重点产业共性关键技术创新重大主题专项项目(cstc2017zdcy-zdzx0030) |
|
| Cell Search PSS Timing Synchronization Method in 5G System |
| SUN Qiannan,ZHANG Zhizhong |
| (School of Communication and Information Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China) |
| Abstract: |
| Due to the abnormality of frequency offset caused by 5G primary synchronization signal(PSS) detection,the mobile communication system can′t achieve accurate timing synchronization.A joint detection algorithm of differential and fast frequency domain correlation is proposed.The algorithm firstly performs differential processing on the local signal and the received signal to reduce the frequency offset effect.Secondly,based on fast frequency-domain correlation algorithm,time-domain cross-correlation is transformed into frequency-domain multiplication operation to reduce computational complexity.Finally,synchronization points are detected by comparing correlation peaks.The algorithm analysis and simulation show that the improved algorithm can detect the synchronization point accurately and quickly under the condition of large frequency offset.Compared with the traditional cross-correlation algorithm,the computational complexity of the proposed algorithm is reduced by 89.99%;and when the frequency offset is at 0.6,the correct detection probability is close to 0.9. |
| Key words: 5G system primary synchronization signal timing synchronization differential processing fast frequency domain correlation |
《电讯技术》编辑部 