Consideration of PHY design for 1.08GHz channel Sept 2012 doc.: IEEE 802.11-012/xxxxr0 April 2013 Consideration of PHY design for 1.08GHz channel Date: 2013-04-24 Presenter: Changming Zhang, Bo Gao Xiaoming Peng / I2R

Author List April 2013 Changming Zhang, Bo Gao

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

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

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

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

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

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

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

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

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 5/8 866.25 433.125 20 QPSK 1386 21 1732.5 22 3/4 2079 1039.5 23 16QAM 2772 24 3465 25 4158 26 13/16 4504.5 2252.25 27 64QAM 5197.5 2598.75 28 6237 3118.5 29 6756.75 3378.375 Changming Zhang, Bo Gao

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 1251.25 625.625 6 pi/2-QPSK 1540 7 1925 8 2310 9 2502.5 Changming Zhang, Bo Gao

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 3753.75 Changming Zhang, Bo Gao

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

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

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

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

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

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

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

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

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

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

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

DC estimation analysis April 2013 DC estimation analysis Changming Zhang, Bo Gao

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

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

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

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

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

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

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

April 2013 Thanks！ Changming Zhang, Bo Gao