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Maximum-Likelihood Synchronization and Channel Estimation for OFDMA Uplink Transmissions. Chi-En Li Directed by Prof. Jung-Shan Lin Graduate Institute of Communication Engineering National Chi Nan University 12/ 11/ 2008. Outline. System model and signal model CFO estimation - PowerPoint PPT Presentation
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Maximum-Likelihood Synchronization and Channel Estimation for OFDMA Uplink
Transmissions
Chi-En LiChi-En LiDirected by Prof. Jung-Shan LinDirected by Prof. Jung-Shan Lin
Graduate Institute ofGraduate Institute of Communication EngineeringCommunication EngineeringNational Chi Nan UniversityNational Chi Nan University
12/ 11/ 200812/ 11/ 2008
OutlineOutline
• System model and signal model
• CFO estimation
• Estimation of the timing offsets and channel • Simulation
• Conclusion
System modelSystem model
Signal modelSignal model
CFO estimationCFO estimation
• Alternating-Projection Frequency Estimator (APFE)
CFO estimationCFO estimation
CFO estimationCFO estimation
CFO estimationCFO estimation
CFO estimationCFO estimation• Approximate Alternating-Projection Frequency Estimator
(AAPFE)
Estimation of the timing offsets and channel responses
Estimation of the timing offsets and channel responses
Simulation parameters• Operation = 5GHz• Signal bandwidth = 20MHz• L = 8• Ng = 28• QPSK• N = 128 • CFO ~ [-0.32 , 0.32]• Delay ~ [0 , 20] (sample period)• HIPERLAN/2 channel model
Simulation
Simulation
Simulation
Simulation
ConclusionConclusion
• APFE and AAPFE
• Simulation
The M value The number of user The signal power of user
ReferenceReference
• Maximum-likelihood synchronization and channel estimation for OFDMA uplink transmissionsPun, M.-O.; Morelli, M.; Kuo, C.-C.J.;Communications,
IEEE Transactions on Volume 54, Issue 4, April 2006 Page(s):726 - 736 Digital Object Identifier 10.1109/TCOMM.2006.873093