Simple, Accurate Time Synchronization in an Ethernet Physical Layer Device

2007 ◽  
Author(s):  
David Rosselot
Keyword(s):  
Time Synchronization ◽  
Physical Layer

Self-Correcting Time Synchronization Based on Cross Layer for Wireless Sensor Network

2012 ◽  
Vol 220-223 ◽  
pp. 1871-1876
Author(s):  
Feng Mei Liang ◽  
Bin Liu
Keyword(s):  
Wireless Sensor Network ◽  
Sensor Network ◽  
Time Synchronization ◽  
Mac Protocol ◽  
Physical Layer ◽  
Wireless Sensor ◽  
Cross Layer ◽  
Synchronization Mechanism ◽  
Synchronization Algorithm ◽  
Crystal Oscillation

Due to energy restrictions, node distribution density and hardware computing power etc., the traditional time synchronization mechanism is not suitable for wireless sensor network. The paper discussed the main reason that caused asynchronization and proposed an improved time synchronization algorithm based on cross layer optimization for wireless sensor network. Considering the stability of crystal oscillation and the linearity of crystal deviation in the physical layer, the improved time synchronization mechanism implemented a self-correction by the cross-layer MAC protocol. Estimating the crystal oscillation drift, the crystal deviation had been self-corrected just by a few times data broadcast. The experiment on the MCU Si1000 physical layer platform has demonstrated the practicability of the algorithm. The synchronization algorithm is able to keep a stable network operation in the way of extending the synchronization period and reducing the synchronization cost. The synchronization mechanism is applicable to the active acquisition network, especially the realtime one.

Design and Implementation of Cell Search Time Synchronization in LTE System Based on FPGA

2013 ◽  
Vol 380-384 ◽  
pp. 4076-4079
Author(s):  
De Min Zhang ◽  
Xiang Zhu ◽  
Zhi Hui Qiu ◽  
Chao Bo Duan
Keyword(s):  
Time Synchronization ◽  
Search Time ◽  
Physical Layer ◽  
Timing Synchronization ◽  
Frame Synchronization ◽  
Cell Search ◽  
Symbol Timing ◽  
Symbol Timing Synchronization ◽  
A Cell

LTE is accepted worldwide as the Long Term Evolution Perspective for todays 3G and 4G networks. Cell search time synchronization is an important physical layer procedure by which a user equipment (UE) acquires synchronization with a cell and detects the physical layer cell ID of that cell. Timing synchronization is consisted of the symbol timing synchronization and frame synchronization. This paper supplies the introduction of synchronization signals, presents the detection method, and analyzes the design based on FPGA platform and finally simulated on the Modelsim 6.5 and implemented in Xilinx Virtex-6 kit.

Implementation of Embedded Testbeds Using USRP and GNU-Radio for Performance Measurement and Analysis of PPS and PCO-Based Time Synchronizations

2021 ◽  
Vol 13 (1) ◽  
pp. 25-35
Author(s):  
Hyun Jae Park ◽  
Cheol-woong Lee ◽  
Taeyoung Shin ◽  
Byeong-hee Roh ◽  
Soo Bum Park ◽  
...  
Keyword(s):  
Wireless Networks ◽  
Performance Measurement ◽  
Time Synchronization ◽  
Physical Layer ◽  
Gnu Radio ◽  
The Real ◽  
Real Environment ◽  
Synchronization Algorithm ◽  
Measurement And Analysis

In wireless networks, time synchronization is one of the key functions for the MAC and the physical layer because it is important to accurately transmit data by maintaining the order and consistency of transmission between nodes. The time synchronization can be divided into centralized and distributed methods and there are many synchronization schemes. However, there are little testbeds for comparing and analyzing various time synchronization schemes in a real environment. Most papers analyze the proposed time synchronization algorithm by simulation, and some testbeds are also configured for the proposed scheme only. In this paper, the authors build embedded testbeds using USRP and GNU-Radio. The two typical methods of the centralized and decentralized time synchronizations, PPS, and PCO-based schemes, respectively, are implemented on the testbeds and their performances are measured and analyzed in the real environment.

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