scholarly journals Burst Format Design for Optimum Joint Estimation of Doppler-Shift and Doppler-Rate in Packet Satellite Communications

2007 ◽  
Vol 2007 (1) ◽  
Author(s):  
Luca Giugno ◽  
Francesca Zanier ◽  
Marco Luise
Keyword(s):  
Doppler Shift ◽  
Satellite Communications ◽  
Joint Estimation

scholarly journals Sequence Design Technique for Accurate Timing and Cell ID Estimation in Underwater Acoustic Cellular Systems with a High Doppler

Electronics ◽  
2021 ◽  
Vol 10 (19) ◽  
pp. 2413
Author(s):  
Yeong Jun Kim ◽  
Muhammad Asim ◽  
Tae Ho Im ◽  
Yong Soo Cho
Keyword(s):  
Doppler Shift ◽  
Additive White Gaussian Noise ◽  
Cellular Systems ◽  
Joint Estimation ◽  
Sensor Nodes ◽  
Sequence Length ◽  
Design Technique ◽  
Sequence Design ◽  
Underwater Acoustic ◽  
Simulation Results

In underwater acoustic cellular (UWAC) systems, underwater equipment or sensor nodes (UE/SN) should perform downlink synchronisation and a cell search during the initial access stage using the preambles received from adjacent underwater base stations (UWBSs). The UE/SN needs to estimate accurate timing and cell ID (CID) using the received preambles, and synchronise with a serving UWBS, even in high-Doppler environments. In this paper, a sequence design technique for joint estimation of accurate timing and CID in UWAC systems with a high Doppler is proposed to decrease the receiver complexity and processing time. A generalised Zadoff–Chu sequence is proposed for the preamble design. This sequence is decomposed into multiple short sub-sequences to reduce the effect of Doppler shift on the timing and CID estimation. The performance loss caused by the short sequence length is compensated by combining the sub-sequences using the repetition property of the ZC sequence. The properties (autocorrelation and cross-correlation) of the proposed sequence are derived analytically in the presence of Doppler shift and compared with the simulation results. The simulation results reveal that the proposed technique performs better than existing techniques in both additive white Gaussian noise and multipath channels with a high-Doppler. It is concluded that the proposed technique is suitable for accurate timing estimation and CID detection in UWAC systems with a high Doppler.

scholarly journals Accurate joint estimation of Doppler shift and SNR in mobile communications with high vehicle speed

2017 ◽  
Vol 47 (12) ◽  
pp. 1705-1714
Author(s):  
Limin MENG ◽  
Jingyu HUA ◽  
Min LIN ◽  
Zhijiang XU ◽  
Suonan LI
Keyword(s):  
Mobile Communications ◽  
Doppler Shift ◽  
Joint Estimation ◽  
Vehicle Speed
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