Date: 2013-04-24

1. Consideration of PHY design for 1.08GHz channel Date:2013-04-24 Presenter: Changming Zhang, Bo Gao

2. Author List Changming Zhang, Bo Gao

3. Background Frame structure 1.08GHz modulation and coding schemes IQ imbalance estimation and compensation PA nonlinearity treatment Roadmap Changming Zhang, Bo Gao

4. Feasible scheme It is necessary to define 1.08GHz PHY Changming Zhang, Bo Gao

5. Background Frame structure 1.08GHz modulation and coding schemes IQ imbalance estimation and compensation PA nonlinearity treatment Roadmap Changming Zhang, Bo Gao

6. Frame structure Ctrl PHY (The same as 11ad) OFDM PHY Changming Zhang, Bo Gao

7. Frame structure MR SC PHY (The same as 11ad) HR SC PHY Changming Zhang, Bo Gao

8. Frame structure Low power PHY (The same as 11ad) Changming Zhang, Bo Gao

9. Background Frame structure 1.08GHz modulation and coding schemes IQ imbalance estimation and compensation PA nonlinearity treatment Roadmap Changming Zhang, Bo Gao

10. Ctrl PHY CMCS Changming Zhang, Bo Gao

11. OFDM PHY CMCS Changming Zhang, Bo Gao

12. MR SC PHY CMCS Changming Zhang, Bo Gao

13. HR SC PHY CMCS Changming Zhang, Bo Gao

14. Low power PHY CMCS Changming Zhang, Bo Gao

15. Background Frame structure 1.08GHz modulation and coding schemes IQ imbalance estimation and compensation PA nonlinearity treatment Roadmap Changming Zhang, Bo Gao

16. SFS-IQ imbalance estimation • SFS • Received baseband signal model: Changming Zhang, Bo Gao

17. SFS-IQ imbalance estimation By calculating the second-order expectations of every two adjacent: symbols: Furthermore, let Then Thus, we can obtain: • The reason for “≈’’ is due to the neglect of Δθ, which is reasonable as Δθ is quite small. Changming Zhang, Bo Gao

18. SFS-IQ imbalance compensation With IQ imbalance, the received baseband signal can be expressed as: Without the presence of IQ imbalance, the baseband signals can be expressed as IQ compensation can be performed as: Changming Zhang, Bo Gao

19. IQcompensation evaluation-16 QAM LOS • L=128, =0.1，∆=10； Changming Zhang, Bo Gao

20. IQcompensation evaluation-16 QAM NLOS Changming Zhang, Bo Gao

21. IQcompensation evaluation-64 QAM LOS Changming Zhang, Bo Gao

22. IQcompensation evaluation-64 QAM NLOS Changming Zhang, Bo Gao

23. Background Frame structure 1.08GHz modulation and coding schemes IQ imbalance estimation and compensation PA nonlinearity treatment Roadmap Changming Zhang, Bo Gao

24. Constellation diagram Standard constellation Distorted constellation • PA nonlinearity distorts the constellation. We estimate the distorted constellation (DC) with TBLK in the Header for QAM signals, and demodulate signal according to DC. Changming Zhang, Bo Gao

25. DC estimation analysis Changming Zhang, Bo Gao

26. Frame design • TBLK and payload BLK are with the same modulation; • Every constellation point appears with the same probability in the TBLK. Changming Zhang, Bo Gao

27. Parameters to be estimated: Tdistorted amplitudes, T additional phases: . (T＝3 for 16QAM) • Likelihood function (LF) for the k-th symbol: • Joint LF: • Let, then • By equaling the above first-order derivatives to zero, we can obtain the estimation results: DC estimation Changming Zhang, Bo Gao

28. Hard decision demodulation: For every received symbol, the demodulation output is the DC point with the least distance to it. • Soft decision demodulation: The DC soft demodulation style is similar to the SC soft demodulation, where the SC points should be replaced by the DC points. For example, if we require the LLR output demodulation, it can be depicted as: DC demodulation Changming Zhang, Bo Gao

29. Performance evaluation-16 QAM LOS Changming Zhang, Bo Gao

30. Performance evaluation-16 QAM NLOS Changming Zhang, Bo Gao

31. Performance evaluation-64QAM LOS Changming Zhang, Bo Gao

32. Performance evaluation-64QAM NLOS Changming Zhang, Bo Gao

33. Thanks！ Changming Zhang, Bo Gao