On the Convolutionally Encoded OFDM System with Symbol Time Offset

2012 ◽  
Vol E95.B (9) ◽  
pp. 2931-2935
Author(s):  
Yung-Yi WANG
Keyword(s):  
Ofdm System ◽  
Time Offset

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.

GNSS Inter-system Time-Offset Estimates and Impact on High Altitude SSV

2020 ◽  
Author(s):  
Sabrina Ugazio ◽  
Brian C. Peters ◽  
Kevin Croissant ◽  
Gregory Jenkins ◽  
Ryan McKnight ◽  
...  
Keyword(s):  
High Altitude ◽  
Time Offset ◽  
System Time

An Interference Rejection Combining Technique for an SFBC-OFDM System with Multiple Carrier Frequency Offsets

2016 ◽  
Vol E99.B (2) ◽  
pp. 481-487
Author(s):  
Mina LEE ◽  
Rothna PEC ◽  
Kyu Seok KIM ◽  
Chang Hwan PARK ◽  
Yong Soo CHO
Keyword(s):  
Carrier Frequency ◽  
Interference Rejection ◽  
Ofdm System ◽  
Carrier Frequency Offsets ◽  
Frequency Offsets

Transmission Performance of Space Time Block Coding with Grouped Phase Rotation for Asymmetric MIMO-OFDM System

2011 ◽  
Vol E94-B (12) ◽  
pp. 3540-3549
Author(s):  
Akinori NAKAJIMA ◽  
Kenichiro TANAKA ◽  
Akinori OHASHI ◽  
Hiroshi HATTORI ◽  
Akihiro OKAZAKI ◽  
...  
Keyword(s):  
Space Time ◽  
Ofdm System ◽  
Time Block ◽  
Transmission Performance ◽  
Block Coding ◽  
Phase Rotation ◽  
Space Time Block Coding ◽  
Mimo Ofdm
Sign in / Sign up

Export Citation Format

Share Document