Doppler frequency offsets estimation for high-mobility OFDM systems

2012 ◽  
Author(s):  
Wei Guo ◽  
Pengcheng Mu ◽  
Qinye Yin ◽  
Ke Deng
Keyword(s):  
High Mobility ◽  
Doppler Frequency ◽  
Ofdm Systems ◽  
Frequency Offsets

scholarly journals Method of Doppler Frequency Spread Estimation for High-Mobility OFDM Systems

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
Feng Zhao ◽  
Xihong Sun
Keyword(s):  
Autocorrelation Function ◽  
Orthogonal Frequency Division Multiplexing ◽  
Estimation Error ◽  
High Mobility ◽  
Doppler Frequency ◽  
Estimation Algorithm ◽  
Least Square ◽  
Ofdm Systems ◽  
Frequency Spread ◽  
Spread Estimation

A method of Doppler frequency spread (DFS) estimation algorithm is discussed which is suitable for high-mobility Orthogonal Frequency Division Multiplexing (OFDM) systems. DFS is a main factor which may mitigate the performance of system. The proposed method is based on autocorrelation function algorithm of received signal which utilizes cyclic prefix (CP) to estimate Doppler spread. The estimation algorithm uses least square (LS) method between the autocorrelation function of received signal and the zero-order Bessel function which is approximated by the expansion of power series. Then the estimation bias is analyzed and using polynomial fitting method can effectively correct estimation error at different DFS, respectively. Compared with the previously proposed method, the estimation performance of DFS in the proposed method has better performance. Simulation results show that when sufficient elements are used, the proposed scheme can effectively estimate DFS and can be applied into high-mobility OFDM systems.

scholarly journals Performance evaluation of high mobility OFDM channel estimation techniques

2020 ◽  
Vol 10 (3) ◽  
pp. 2562
Author(s):  
Maryam K. Abboud ◽  
Bayan M. Sabbar
Keyword(s):  
Orthogonal Frequency Division Multiplexing ◽  
Performance Test ◽  
High Mobility ◽  
Doppler Frequency ◽  
Multipath Fading ◽  
Least Square ◽  
Mobile Systems ◽  
Estimation Methods ◽  
Ofdm Systems ◽  
Ofdm Symbol

In wireless communication, Orthogonal Frequency Division Multiplexing (OFDM) has been adopted due to its robustness to multipath fading and high data rate transmissions. At the other hand, the performance of OFDM systems severely degraded due to multi-path fading and Doppler frequency shifts in mobile systems, which causes inter-carrier-interference (ICI). Thus, Estimation of channel parameters is required at the receiver using a pre designed estimator where pilot tones are inserted in each OFDM symbol. In this paper, a random pilot data are generated and inserted in each OFDM symbol at equally spaced locations. The performance test of Least Square (LS) and Linear Minimum Mean Square (LMMSE) estimation methods are proposed with Discrete Fourier Transform (DFT) based on both LS and LMMSE, where different ITU channel models are considered in order to compare their performance for data transmission in high mobile systems with different Doppler frequencies exceeds 200 Hz and minimal number of pilots.

Intercarrier-Interference-Aware Energy Saving for High-Mobility Cognitive OFDM Systems

2018 ◽  
Vol E101.B (1) ◽  
pp. 203-212
Author(s):  
Wenjun XU ◽  
Xuemei ZHOU ◽  
Yanda CHEN ◽  
Zhihui LIU ◽  
Zhiyong FENG
Keyword(s):  
Energy Saving ◽  
High Mobility ◽  
Intercarrier Interference ◽  
Ofdm Systems

A Robust Channel Estimator for High-Mobility STBC-OFDM Systems

2010 ◽  
Vol 57 (4) ◽  
pp. 925-936 ◽  
Author(s):  
Hsiao-Yun Chen ◽  
Meng-Lin Ku ◽  
Shyh-Jye Jou ◽  
Chia-Chi Huang
Keyword(s):  
High Mobility ◽  
Ofdm Systems ◽  
Channel Estimator
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