A Joint Frequency Offset Estimation Method for 5G System based on PSS and SSS

GAO Shang-lei; ZHANG Zhi-zhong; DUAN Yu; XI Bing

doi:10.13756/j.gtxyj.2020.06.016

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A Joint Frequency Offset Estimation Method for 5G System based on PSS and SSS

- A Joint Frequency Offset Estimation Method for 5G System based on PSS and SSS
- Study on Optical communication Issue 6, Pages: 65-69(2020)
- 作者机构：
  
  重庆邮电大学通信与信息工程学院
- 作者简介：
- 基金信息：
- DOI：10.13756/j.gtxyj.2020.06.016
  CLC： TN929.5
- Published：2020，
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[1]高尚蕾,张治中,段浴,席兵.5G系统基于PSS和SSS联合频偏估计方法[J].光通信研究,2020(06):65-69.

GAO Shang-lei, ZHANG Zhi-zhong, DUAN Yu, et al. A Joint Frequency Offset Estimation Method for 5G System based on PSS and SSS. [J]. (6):65-69(2020)
[1]高尚蕾,张治中,段浴,席兵.5G系统基于PSS和SSS联合频偏估计方法[J].光通信研究,2020(06):65-69. DOI： 10.13756/j.gtxyj.2020.06.016.

GAO Shang-lei, ZHANG Zhi-zhong, DUAN Yu, et al. A Joint Frequency Offset Estimation Method for 5G System based on PSS and SSS. [J]. (6):65-69(2020) DOI： 10.13756/j.gtxyj.2020.06.016.

摘要

针对5G中下行正交频分复用（OFDM）系统由于多普勒频移和发送机与接收机晶振不同步引起频率误差导致接收机解调信号出错的问题

文章提出了一种主同步信号（PSS）和辅助同步信号（SSS）联合的频偏估计算法。首先

对接收端的PSS和SSS分别与本地PSS和SSS进行互相关运算

其次将同一时隙第1个同步信号和物理广播信道块（PBCH）（SSB）的PSS互相关结果与第2个SSB的SSS互相关结果进行互相关运算计算初始频偏值;最后用同一个SSB中的PSS互相关结果和SSS互相关结果作互相关运算计算新的频偏值

并采用初始的频偏值对其进行极性修正

从而得到最终频偏。与基于PSS的频偏估计算法相比

该方法利用PSS和SSS进行联合频偏估计

提高了算法精度

同时将估计范围从[-3.5

3.5] kHz扩大到了[-7.0

7.0] kHz。

Abstract

Aiming at the problems of signal demodulation in 5 G downlink Orthogonal Frequency Division Multiplexing（OFDM） system due to Doppler frequency shift and frequency error caused by the non-synchronized transmitter and receiver crystal oscillators

a Primary Synchronization Signal（PSS） and Secondary Synchronization Signal（SSS） combined frequency offset estimation algorithm is proposed. Firstly

the cross correlation values of the PSS and SSS at the receiving end are calculated with the local PSS and SSS

respectively. Then

the PSS cross-correlation result of the first synchronization signal and Physical Broadcast Channel（PBC） block is used to calculate the initial frequency offset value with the SSS cross-correlation results of the second SSB block. Finally

we use the PSS cross-correlation results and SSS cross-correlation results in the same SSB block to perform cross-correlation calculations to calculate the new frequency offset value

and also use the initial frequency offset value to correct its polarity to obtain the final frequency offset. Compared with the PSS-based frequency offset estimation algorithm

this method uses PSS and SSS for joint frequency offset estimation to improve the accuracy of the algorithm

and expands the estimation range from [-3.5

3.5] kHz to [-7.0

7.0] kHz.

关键词

5G正交频分复用频偏估计主同步信号辅助同步信号

Keywords

5GOFDMfrequency offset estimationPSSSSS

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