波束扫描下5G毫米波小区搜索算法

doi:10.11959/j.issn.1000-0801.2020157

Abstract

Abstract:

Due to the high carrier frequency of the 5G millimeter wave,a large initial access frequency may cause inaccurate time-frequency synchronization at the transmitting and receiving ends and incorrect detection of the physical layer cell identifier.A cell search scheme for 5G millimeter waves to send synchronization signals in a beam sweeping mode at high frequencies was analyzed and simulated.Specifically,a multi-directional synchronization signal block sent by a DFT codebook at the base station side was proposed.The terminal used an omnidirectional antenna to receive multi-beam signals and used a series of synchronization algorithms to complete time,frequency synchronization,and physical layer cell identification.Simulation results show that the proposed main synchronization signal detection algorithm with cross-correlation of pre-stored integer frequency offset and received signal has good cell search performance on 5G millimeter-wave channels.

Key words: cell search in 5G mmWave, beam sweeping, synchronization algorithm, frequency offset estimation

CLC Number:

TN929.5

Min SHEN,Jing LIANG,Jiazhi HOU. 5G millimeter wave cell search algorithm with beam sweeping[J]. Telecommunications Science, 2020, 36(6): 97-106.

Figures/Tables 17

方法	乘法次数/次	加减法次数/次
传统PSS信号互相关算法	3× N _sample × N_IFFT	3× N _sample ×(N_IFFT-1)
PSS信号分段互相关算法	3× N_sample×N_IFFT	$3 \times N_{sample} \times (\frac{N_{IFFT}}{M} - 1) \times M$
本文采用的算法	15× N_sample×N_IFFT	15× N_sample×(N_IFFT-1)

参数	参数值
发送端 $N_{I D}^{(2)}$ l	119
子载波间隔	120 kHz
归一化频偏CFO	0
信道	CDL-C
信噪比	0 dB

参数	参数值
发送端 $N_{I D}^{c e l l}$ l	119
子载波间隔	120 kHz
归一化频偏CFO	1
信道	CDL-C
信噪比	0 dB

参数	参数值
接收信号	已补偿IFO的信号
发送端 $N_{I D}^{c e l l}$	119
接收信号残留FFO	0.4、0.8
信道	CDL-C、CDL-D、CDL-E+AWGN
信噪比	-20:10 dB

参数	参数值
FFT/IFFT点数	512
CP点数	长CP：40，短CP：36
子载波间隔	120 kHz
频段	30 GHz
归一化频偏CFO	0/0.4/1.8
$N_{I D}^{c e l l}$	119
信道	CDL-C/CDL-D/CDL-E+AWGN
信噪比	-24:-4 dB

References 16

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