A Novel Timing Estimation Method Based on Symmetrical&Conjugate Prefix in OFDM System

2006 ◽  
Author(s):  
Hewei Yu
Keyword(s):  
Estimation Method ◽  
Ofdm System ◽  
Timing Estimation

A Novel Timing Estimation Method for Chirp-Based Systems

2011 ◽  
Vol E94-B (12) ◽  
pp. 3607-3609
Author(s):  
Sanghun YOON ◽  
Dae-Gun OH ◽  
Jong-Wha CHONG ◽  
Tae Moon ROH ◽  
Jong-Kee KWON ◽  
...  
Keyword(s):  
Estimation Method ◽  
Timing Estimation

Data-aided linear fitting blind phase estimation method for coherent optical OFDM system

2015 ◽  
Vol 31 (2) ◽  
pp. 316-320
Author(s):  
Man Pan ◽  
Xuebing Zhang ◽  
Jianping Li ◽  
Zhaohui Li
Keyword(s):  
Estimation Method ◽  
Phase Estimation ◽  
Ofdm System ◽  
Linear Fitting ◽  
Optical Ofdm

scholarly journals Pilot Based Channel Estimation and Synchronization in OFDM System

2020 ◽  
Vol 26 (6) ◽  
pp. 50-59
Author(s):  
Mahmood Mohmmmed saeed Abdul Majed ◽  
Buthaina Mosa Omran
Keyword(s):  
Channel Estimation ◽  
Orthogonal Frequency Division Multiplexing ◽  
Carrier Frequency Offset ◽  
Estimation Method ◽  
Frequency Division ◽  
Ofdm System ◽  
Synchronization Errors ◽  
Rayleigh Channel ◽  
Significant Performance ◽  
Time Offset

Channel estimation and synchronization are considered the most challenging issues in Orthogonal Frequency Division Multiplexing (OFDM) system. OFDM is highly affected by synchronization errors that cause reduction in subcarriers orthogonality, leading to significant performance degradation. The synchronization errors cause two issues: Symbol Time Offset (STO), which produces inter symbol interference (ISI) and Carrier Frequency Offset (CFO), which results in inter carrier interference (ICI). The aim of the research is to simulate Comb type pilot based channel estimation for OFDM system showing the effect of pilot numbers on the channel estimation performance and propose a modified estimation method for STO with less number of pilot to mitigate ISI effect. Channel estimation is simulated for different pilot number with 16QAM modulation in Ped-A Rayleigh channel. The STO effect assumed less than the cyclic prefix length to minimize ISI and maintain the orthogonality between subcarriers. The simulation results show that the high number of pilots are needed to achieve good channel estimation in case no synchronization used while similar results are achieved with smaller number of pilots if the propose modification on the synchronization method are used aligned with the channel estimation. The proposed system is evaluated in terms of BER and SNR.

scholarly journals Improved Timing Estimation Using Iterative Normalization Technique for OFDM Systems

2017 ◽  
Vol 7 (2) ◽  
pp. 905
Author(s):  
Suyoto Suyoto ◽  
Iskandar Iskandar ◽  
Sugihartono Sugihartono ◽  
Adit Kurniawan
Keyword(s):  
Computer Simulation ◽  
Detection Probability ◽  
Multipath Channel ◽  
Delay Spread ◽  
Ofdm Systems ◽  
Ofdm System ◽  
Timing Estimation ◽  
Multipath Environment ◽  
Channel Environment ◽  
Statistical Change

<p>Conventional timing estimation schemes based on autocorrelation experience performance degradation in the multipath channel environment with high delay spread. To overcome this problem, we proposed an improvement of the timing estimation for the OFDM system based on statistical change of symmetrical correlator. The new method uses iterative normalization technique to the correlator output before the detection based on statistical change of symmetric correlator is applied. Thus, it increases the detection probability and achieves better performance than previously published methods in the multipath environment. Computer simulation shows that our method is very robust in the fading multipath channel</p>

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