1. Consideration of PHY design for 1.08GHz channel
Sept 2012
doc.: IEEE /xxxxr0
April 2013
Consideration of PHY design for 1.08GHz channel
Date:
Presenter:
Changming Zhang, Bo Gao
Xiaoming Peng / I2R

2. Author List
April 2013
Changming Zhang, Bo Gao

3. 1.08GHz modulation and coding schemes
April 2013
Roadmap
Background
Frame structure
1.08GHz modulation and coding schemes
IQ imbalance estimation and compensation
PA nonlinearity treatment
Changming Zhang, Bo Gao

4. It is necessary to define 1.08GHz PHY
April 2013
Feasible scheme
It is necessary to define 1.08GHz PHY
Changming Zhang, Bo Gao

5. 1.08GHz modulation and coding schemes
April 2013
Roadmap
Background
Frame structure
1.08GHz modulation and coding schemes
IQ imbalance estimation and compensation
PA nonlinearity treatment
Changming Zhang, Bo Gao

6. Ctrl PHY (The same as 11ad)
April 2013
Frame structure
Ctrl PHY (The same as 11ad)
OFDM PHY
Changming Zhang, Bo Gao

7. MR SC PHY (The same as 11ad)
April 2013
Frame structure
MR SC PHY (The same as 11ad)
HR SC PHY
Changming Zhang, Bo Gao

8. Low power PHY (The same as 11ad)
April 2013
Frame structure
Low power PHY (The same as 11ad)
Changming Zhang, Bo Gao

9. 1.08GHz modulation and coding schemes
April 2013
Roadmap
Background
Frame structure
1.08GHz modulation and coding schemes
IQ imbalance estimation and compensation
PA nonlinearity treatment
Changming Zhang, Bo Gao

10. CMCS Ctrl PHY April 2013 CMCS Index Modulation
Code Rate (Spreading Factor if not = 1)
Payload Rate，11ad (Mbps)
Payload Rate，1.08GHz (Mbps)
Pi/2-DBPSK
1/2 (32, with pi/2-rotation)
27.5
13.75
Changming Zhang, Bo Gao

11. CMCS OFDM PHY April 2013 CMCS Index Modulation
Code Rate (Spreading Factor if not = 1)
Payload Rate，11ad (Mbps)
Payload Rate，1.08GHz (Mbps) 18
SQPSK
1/2
693
346.5 19
5/8
866.25 20
QPSK
1386 21
1732.5 22
3/4
2079
1039.5 23
16QAM
2772 24
3465 25
4158 26
13/16
4504.5 27
64QAM
5197.5 28
6237
3118.5 29
Changming Zhang, Bo Gao

12. CMCS MR SC PHY April 2013 CMCS Index Modulation
Code Rate (Spreading Factor if not = 1)
Payload Rate，11ad (Mbps)
Payload Rate，1.08GHz (Mbps) 1
pi/2-BPSK
1/2 (2)
385
192.5 2
1/2
770 3
5/8
962.5
481.25 4
3/4
1155
577.5 5
13/16 6
pi/2-QPSK
1540 7
1925 8
2310 9
2502.5
Changming Zhang, Bo Gao

13. CMCS HR SC PHY April 2013 CMCS Index Modulation
Code Rate (Spreading Factor if not = 1)
Payload Rate，11ad (Mbps)
Payload Rate，1.08GHz (Mbps) 10
pi/2-16QAM
1/2
3080
1540 11
5/8
3850
1925 12
3/4
4620
2310 13
13/16 \
2502.5 14
pi/2-64QAM 15
2887.5 16
3465 17
Changming Zhang, Bo Gao

14. CMCS Low power PHY April 2013 CMCS Index Modulation
Code Rate (Spreading Factor if not = 1)
Payload Rate，11ad (Mbps)
Payload Rate，1.08GHz (Mbps) 30
pi/2-BPSK
13/28
626
313 31
13/21
834
417 32
52/63
1112
656 33
pi/2-QPSK
1251
625.5 34
1668 35
2224 36
13/14
2503
1251.5
Changming Zhang, Bo Gao

15. 1.08GHz modulation and coding schemes
April 2013
Roadmap
Background
Frame structure
1.08GHz modulation and coding schemes
IQ imbalance estimation and compensation
PA nonlinearity treatment
Changming Zhang, Bo Gao

16. SFS-IQ imbalance estimation
April 2013
SFS-IQ imbalance estimation
SFS
Received baseband signal model:
Changming Zhang, Bo Gao

17. SFS-IQ imbalance estimation
April 2013
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
April 2013
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. IQ compensation evaluation-16 QAM LOS
April 2013
IQ compensation evaluation-16 QAM LOS
L=128, =0.1，∆=10；
Changming Zhang, Bo Gao

20. IQ compensation evaluation-16 QAM NLOS
April 2013
IQ compensation evaluation-16 QAM NLOS
Changming Zhang, Bo Gao

21. IQ compensation evaluation-64 QAM LOS
April 2013
IQ compensation evaluation-64 QAM LOS
Changming Zhang, Bo Gao

22. IQ compensation evaluation-64 QAM NLOS
April 2013
IQ compensation evaluation-64 QAM NLOS
Changming Zhang, Bo Gao

23. 1.08GHz modulation and coding schemes
April 2013
Roadmap
Background
Frame structure
1.08GHz modulation and coding schemes
IQ imbalance estimation and compensation
PA nonlinearity treatment
Changming Zhang, Bo Gao

24. Constellation diagram
April 2013
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
April 2013
DC estimation analysis
Changming Zhang, Bo Gao

26. April 2013
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. April 2013
DC estimation
Parameters to be estimated: T distorted 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:
Changming Zhang, Bo Gao

28. Hard decision demodulation:
April 2013
DC demodulation
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:
Changming Zhang, Bo Gao

29. Performance evaluation-16 QAM LOS
April 2013
Performance evaluation-16 QAM LOS
Changming Zhang, Bo Gao

30. Performance evaluation-16 QAM NLOS
April 2013
Performance evaluation-16 QAM NLOS
Changming Zhang, Bo Gao

31. Performance evaluation-64QAM LOS
April 2013
Performance evaluation-64QAM LOS
Changming Zhang, Bo Gao

32. Performance evaluation-64QAM NLOS
April 2013
Performance evaluation-64QAM NLOS
Changming Zhang, Bo Gao

33. April 2013
Thanks！
Changming Zhang, Bo Gao