A Novel PSS Timing Synchronization Algorithm for Cell Search in 5G NR System

Abstract

Cell search is the first step to establish downlink synchronization between user equipment (UE) and base station (BS) in the fifth generation (5G) new radio (NR) system. However, frequency offset and noise will cause a massive loss of synchronization performance. To solve this problem, a novel timing synchronization algorithm of primary synchronization signal (PSS) with anti-frequency offset and antinoise is proposed, which includes the improved coarse synchronization algorithm based on Fourier transform and the fine synchronization algorithm based on the triple auto-correlation algorithm. The improved coarse synchronization algorithm not only has a strong frequency offset resistance, especially for large frequency offset, but also obtains the estimated frequency offset. The fine synchronization algorithm is more resistant to noise than the conventional algorithm. Finally, the algorithm analysis and simulation results show that the improved algorithm can work very well even when the normalized frequency offset increases to greater than 0.8, but the conventional algorithm fails to synchronize properly. Meanwhile, when the SNR is as low as -6dB, the detection accuracy of the timing synchronization based on the proposed fine synchronization algorithm is improved by about 31.7% compared with the conventional algorithm.

A Comparison Between Tone-Based and Code-Based Cell Search Schemes for Multipath Division Multiple Access

“…Likewise, 5G-NR uses the similar cell search method as in the LTE-A, which is also a kind of Code Based Cell Search. A PSS based timing synchronization algorithm with anti-frequency offset and anti-noise is developed in [18]. It proposed improved coarse and fine timing synchronization algorithms based on Fourier theory and a triple autocorrelation algorithm.…”

Design and Implementation of an Efficient Wake-Up Synchronization Scheme Based on History in a 5G Software Modem

“…In these works, the amount of multiplications is reduced based on K-means clustering [10] and two improved PSS detectors are presented for operating correlation of the half of the sequence [11]. On the other hand, some research works improve the detection performance by enhancing robustness to frequency offset in a low Signal to Noise Ratio (SNR) regime [12], [13]. However, none of these research works are applied to the DRX situation in which the UE periodically synchronizes to the downlink signal.…”

A Novel Network Resolved and Mobile Assisted Cell Search Method for 5G Cellular Communication Systems

“…Later, in 2017, 3GPP announced the first version of the 5G-NR standard [19], [20], specifying both the structure and key properties of NR for the initial cell search, and in [21]- [26], the 3GPP standard for initial cell search in 5G-NR was officially described. Furthermore, in [24]- [26], studies relevant to initial cell search of 5G system were provided. Specifically, in [24], a novel timing synchronization algorithm with anti-frequency offset and anti-noise properties was proposed with the primary synchronization signal (PSS).…”

“…Furthermore, in [24]- [26], studies relevant to initial cell search of 5G system were provided. Specifically, in [24], a novel timing synchronization algorithm with anti-frequency offset and anti-noise properties was proposed with the primary synchronization signal (PSS). In [25], a deeplearning-based initial access method for the mmWave MIMO system was proposed.…”