1. doc.: IEEE 802.11-10/1062r2 Submission Zhendong Luo, CATR September 2010 RF Feasibility of 120 MHz Channelization for China Date: 2010-09-14 Authors: Slide 1

2. doc.: IEEE 802.11-10/1062r2 Submission Zhendong Luo, CATR September 2010 Slide 2

3. doc.: IEEE 802.11-10/1062r2 Submission Zhendong Luo, CATR September 2010 Abstract In this presentation, we analyze the RF feasibility of 120 MHz channelization in China and show it totally meets the 5 GHz RF regulation of China. Based on huge market demands, we strongly propose 802.11ac to support an efficient channelization for China. Slide 3

4. doc.: IEEE 802.11-10/1062r2 Submission Zhendong Luo, CATR September 2010 Motivation Different from other regions, China has a unique 125 MHz bandwidth (5,725 ~ 5,850 MHz). The channelization schemes for other regions are obviously inefficient for China. A 120MHz channelization can significantly improve the frequency utilization in China. However, if 120MHz channelization is adopted, only 5 MHz bandwidth can be used as guard sidebands, which may produce too much out-of-band radiation. In the following, we will analyze the RF feasibility of 120 MHz channelization. Slide 4

5. doc.: IEEE 802.11-10/1062r2 Submission Zhendong Luo, CATR September 2010 China’s RF regulation in 5 GHz band The major RF requirements are as follows: –Frequency range: 5,725 ~ 5,850 MHz –Total transmit power: ≤ 27dBm (500mW) –The maximum PSD: ≤ 13dBm/MHz, ≤ 19dBm/MHz (EIRP) –Out-of-band radiation (EIRP): ≤ -80dBm/Hz (-20dBm/MHz) According to the EVM document, the total TX power shall be limited to no more than 17 dBm (50mW), which is 10 dB lower than China’s requirement (27dBm). It means –there is a 10dB back-off advantage for the PSD of 802.11ac signals, so it is much easier for 120MHz transmission to meet the spectral mask of China. Slide 5

6. doc.: IEEE 802.11-10/1062r2 Submission Zhendong Luo, CATR September 2010 5GHz spectral mask in China Slide 6 125 MHz The average PSD ≤ 6 dBm/MHz The maximum PSD ≤ 13 dBm/MHz Out-of-band radiation ≤ -20dBm/MHz 5,725 MHz5,850 MHz The average PSD of 11ac ≤ -4 dBm/MHz 16dB 10dB 7dB The maximum PSD (EIRP) ≤ 19 dBm/MHz 6dB

7. doc.: IEEE 802.11-10/1062r2 Submission Zhendong Luo, CATR September 2010 802.11n spectral mask for 40 MHz channel Slide 7 The 802.11n spectral mask is much sharper than the Chinese requirement. 120MHz transmission can directly meet the Chinese regulation without any additional operations.

8. doc.: IEEE 802.11-10/1062r2 Submission Zhendong Luo, CATR September 2010 Simulation parameters For further study, we need a specific 120 MHz channelization scheme. In our simulation, we simply assume it consists of three 40 MHz 11n channels. According to the EVM document, the total transmit power is 17dBm (50mW), and the resulting average PSD over 125MHz is -4 dBm/MHz. The power amplifier (PA) model and the phase noise model given in the EVM document are adopted. Different OFDM symbols have different frequency-domain characteristics. We consider three kinds of OFDM symbols with different guard intervals. –Normal GI: T GI = T DFT /4 = 0.8 us –Short GI: T GIS = T DFT /8 = 0.4 us –Double GI: T GI2 = T DFT /2 = 1.6 us Slide 8

9. doc.: IEEE 802.11-10/1062r2 Submission Zhendong Luo, CATR September 2010 PSD of 120 MHz transmission using normal GI Slide 9

10. doc.: IEEE 802.11-10/1062r2 Submission Zhendong Luo, CATR September 2010 PSD of 120 MHz transmission using short GI Slide 10

11. doc.: IEEE 802.11-10/1062r2 Submission Zhendong Luo, CATR September 2010 PSD of 120 MHz transmission using double GI Slide 11

12. doc.: IEEE 802.11-10/1062r2 Submission Zhendong Luo, CATR September 2010 Maximum TX power of 120 MHz transmission The out-of-band radiation of 120MHz transmission is 7.5 ~ 8.5 dB lower than the China’s RF requirement. If necessary, the total TX power (EIRP) can be further increased to improve performance and coverage by –employing directional antennas, or –simply increasing transmit power If the PA model remains unchanged, then we have Slide 12 Normal GIShort GIDouble GI Max. TX power growth 8.0 dB7.5 dB8.5 dB Max. of average PSD (EIRP) 4 dBm/MHz3.5 dBm/MHz4.5 dBm/MHz Max. TX power (EIRP) 25.0 dBm24.5 dBm25.5 dBm

13. doc.: IEEE 802.11-10/1062r2 Submission Zhendong Luo, CATR September 2010 Why 802.11 needs 120 MHz channelization China is the biggest potential market for 802.11 –More than 700 million mobile phone users –More than 400 million Internet users –More than 400 million TV screens (wireless display applications) To develop the Chinese market, a very fundamental requirement is to make 802.11 standards compatible with the Chinese spectrum regulation. 120 MHz channelization provides a really good opportunity to significantly increase the entire industry’s revenue. Slide 13

14. doc.: IEEE 802.11-10/1062r2 Submission Zhendong Luo, CATR September 2010 Conclusion It is shown that 120 MHz channelization completely meets the Chinese spectrum regulation. We reemphasize how important the Chinese market is for 802.11 standards. We strongly propose 802.11ac to support an efficient channelization for China, where the total available channel bandwidth is up to 120 MHz. Slide 14

15. doc.: IEEE 802.11-10/1062r2 Submission Zhendong Luo, CATR September 2010 References 11-10-0778-01-00ac-120-mhz-phy-transmission 11-10-0378-01-00ac-160-mhz-phy-transmission IEEE 802.11n standard 11-09-0992-11-00ac-proposed-specification-framework- for-tgac 11-09-0451-14-00ac-tgac-functional-requirements-and- evaluation-methodology Slide 15

16. doc.: IEEE 802.11-10/1062r2 Submission Zhendong Luo, CATR September 2010 Strawpoll #1-1 Do you support adding the following item into Section 3.1 “Channelization” in the specification framework document, 11-09/0992r13? R3.1.E: The draft specification shall include support for an efficient channelization in China’s (5,725 ~ 5,850 MHz) spectrum. –Yes: –No: –Abstain: Slide 16

17. doc.: IEEE 802.11-10/1062r2 Submission Zhendong Luo, CATR September 2010 Strawpoll #1-2 Do you support adding the following item into Section 3.1 “Channelization” in the specification framework document, 11-09/0992? The total bandwidth of the channels defined for China shall be equal to or not less than 120 MHz. –Yes: –No: –Abstain: Slide 17