scholarly journals Doppler frequency offset estimation and diversity reception scheme of high-speed railway with multiple antennas on separated carriage

2012 ◽  
Vol 20 (4) ◽  
pp. 227-233 ◽  
Author(s):  
Yaoqing Yang ◽  
Pingyi Fan
Keyword(s):  
High Speed ◽  
Multiple Antennas ◽  
Doppler Frequency ◽  
Frequency Offset ◽  
Frequency Offset Estimation ◽  
Diversity Reception ◽  
High Speed Railway

scholarly journals Fast Telemetry and Communication Scheme Based on Doppler Diversity Reception under Large Dynamic Doppler for Hypersonic Vehicles

Electronics ◽  
2019 ◽  
Vol 8 (7) ◽  
pp. 781 ◽  
Author(s):  
Lei Shi ◽  
Lei Zhao ◽  
Chao Zhang ◽  
Bo Yao
Keyword(s):  
High Speed ◽  
Doppler Frequency ◽  
Frequency Offset ◽  
Rate Of Change ◽  
Hypersonic Vehicles ◽  
Diversity Reception ◽  
Communication Signals ◽  
Doppler Diversity ◽  
Communication Time ◽  
Tracking Module

Large dynamic Doppler caused by high-speed flight of hypersonic vehicles brings a great challenge to acquisition, tracking and correct demodulation of telemetry and communication signals. Different from receiving schemes of existing telemetry and communications, a novel communication method based on Doppler diversity reception for hypersonic vehicles was proposed in this study. Firstly, the proposed method offers a coarse acquisition of Doppler frequency offset and its rate-of-change by fast-coarse acquisition method, and then decreases the large Doppler frequency offset into a certain range through compensation. Finally, signals with residual Doppler frequency offset are processed directly by Doppler diversity reception method without a complicated tracing method. Different from the traditional receiving scheme with acquisition and tracking module, the proposed scheme lowers requirements on acquisition accuracy and neglects the accurate tracking module, thus shortening telemetry and communication time significantly for hypersonic vehicles. Simulation results demonstrate that the proposed method can achieve satisfactory performance when the residual Doppler is no higher than 1 kHz with normalized Doppler frequency offset and when the normalized artificial frequency shift is 0.01 and 0.4 respectively.

scholarly journals Simple full-range carrier frequency offset estimation for high speed CO-OFDM

2013 ◽  
Vol 21 (20) ◽  
pp. 23896 ◽  
Author(s):  
Hae Young Rha ◽  
Chun Ju Youn ◽  
Eun Soo Nam ◽  
Hae-Wook Choi
Keyword(s):  
Carrier Frequency ◽  
High Speed ◽  
Carrier Frequency Offset ◽  
Full Range ◽  
Frequency Offset ◽  
Frequency Offset Estimation ◽  
Carrier Frequency Offset Estimation
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