Robust Time Synchronization Scheme Combating Frequency Offset for IEEE 802.16a OFDM Systems

2006 ◽  
Author(s):  
Wu Yuan ◽  
Shi Zhiguo ◽  
Chen Kangsheng
Keyword(s):  
Time Synchronization ◽  
Frequency Offset ◽  
Ofdm Systems ◽  
Ieee 802.16A ◽  
Synchronization Scheme

Time and Frequency Synchronization for MIMO-OFDM Systems

2013 ◽  
Vol 321-324 ◽  
pp. 2888-2891
Author(s):  
Jing Peng Gao ◽  
Chao Qun Wu ◽  
Dan Feng Zhao
Keyword(s):  
Orthogonal Frequency Division Multiplexing ◽  
Carrier Frequency Offset ◽  
Time Synchronization ◽  
Multiple Input Multiple Output ◽  
Frequency Offset ◽  
Time Instant ◽  
Frequency Synchronization ◽  
Ofdm Systems ◽  
Frequency Offset Estimation ◽  
Mimo Ofdm

Any carrier frequency offset will cause a loss of subcarrier orthogonality which results in ICI and hence performance degrades severely in MIMO-OFDM systems. In this paper, a time and frequency synchronization solution for multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems is proposed. The synchronization is achieved using one Constant Amplitude Zero Auto Correlation (CAZAC) sequence-based preamble which is simultaneously transmitted from all transmit antennas in the same OFDM time instant. The synchronization is accomplished sequentially by coarse time synchronization, fractional frequency offset estimation, integral frequency offset estimation and fine time synchronization. The simulation shows that the proposed algorithm can estimate the timing and frequency offsets efficiently in MIMO-OFDM systems, especially in low signal-to-noise ratio condition.

An Eigenvalue Based Carrier Frequency Offset Estimator for OFDM Systems

2013 ◽  
Vol 2 (5) ◽  
pp. 475-478 ◽  
Author(s):  
Abdel Aziz M. Al-Bassiouni ◽  
Muhammad Ismail ◽  
Weihua Zhuang
Keyword(s):  
Carrier Frequency ◽  
Carrier Frequency Offset ◽  
Frequency Offset ◽  
Ofdm Systems
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