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Maximum-Likelihood Synchronization and Channel Estimation for OFDMA Uplink Transmissions

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

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Maximum-Likelihood Synchronization and Channel Estimation for OFDMA Uplink Transmissions

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  1. Maximum-Likelihood Synchronization and Channel Estimation for OFDMA Uplink Transmissions Chi-En Li Directed by Prof. Jung-Shan Lin Graduate Institute ofCommunication Engineering National Chi Nan University 12/ 11/ 2008

  2. Outline • System model and signal model • CFO estimation • Estimation of the timing offsets and channel • Simulation • Conclusion

  3. System model

  4. Signal model

  5. CFO estimation • Alternating-Projection Frequency Estimator (APFE)

  6. CFO estimation

  7. CFO estimation

  8. CFO estimation

  9. CFO estimation • Approximate Alternating-Projection Frequency Estimator (AAPFE)

  10. Estimation of the timing offsets and channel responses

  11. Estimation of the timing offsets and channel responses

  12. 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

  13. Simulation

  14. Simulation

  15. Simulation

  16. Simulation

  17. Conclusion • APFE and AAPFE • Simulation The M value The number of user The signal power of user

  18. Reference • 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

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