1. Overview of CWPAN SG5 QLINKPAN
April 2007
doc.: IEEE /0570r0
March 2012
Overview of CWPAN SG5 QLINKPAN
Date:
Authors:
Haiming Wang, Xiaoming Peng
Eldad Perahia, Intel Corporation

2. Haiming Wang, Xiaoming Peng
March 2012
Contents
CWPAN SG5 Q-LINKPAN
Relationship between IEEE CMMW and Q-LINKPAN
Haiming Wang, Xiaoming Peng

3. Haiming Wang, Xiaoming Peng
March 2012
Overview of Q-LINKPAN
A study group (SG5) Q-LINKPAN was set up under CWPAN in Sept 2010 to develop the China mmWave standard operating in 40~50GHz
It can be used both in short range and point-to-point (Q-Band + LINK + PAN)
Short Range: Q-LINKPAN-S
Point-to-point/Point-to-multipoint: Q-LINKPAN-L
Haiming Wang, Xiaoming Peng

4. Request of Spectrum Allocation in 40~50GHz
March 2012
Request of Spectrum Allocation in 40~50GHz
Request of frequency allocation: 40.5~50.2 GHz;
Unlicensed: ~46.918GHz (3.584GHz BW)
Licensed: 40.5~43.334GHz (2.834GHz BW), ~50.2GHz (2.912GHz BW)
The spectrum of 47~47.2 GHz has been allocated to the amateur radio.
Q-LINKPAN-L uses licensed bands
Q-LINKPAN-S uses unlicensed band
Haiming Wang, Xiaoming Peng

5. Maximum EIRP Density WPAN Equipment P2P Wireless Equipment March 2012
EIRP: refer to Table I
TX frequency tolerance:
P2P: ±1ppm；
P2MP:
Central Station (CS): ±0.05ppm;
Remote Station (RS): ±1ppm.
TX spurious emissions: Satisfy the spectrum mask in the next slide and less than -40dBm/MHz out-of-band.
WPAN Equipment
EIRP: < +20dBm.
TX frequency tolerance: ±1ppm.
Table I: EIRP Density Limitation
Station Type
Maximum EIRP Density （dBW/MHz）
Informative assumptions for deriving the EIRP limits
Maximum Power Spectral Density
at antenna port（dBm/MHz）
Maximum Antenna Gain （dBi）
CS （P2MP） +5
+15 20 RS
（P2MP）
+30 45
P2P links
+40
+20 50
Haiming Wang, Xiaoming Peng

6. Haiming Wang, Xiaoming Peng
March 2012
Spectrum Mask
Haiming Wang, Xiaoming Peng

7. Applications of Q-LINKPAN-S (PAN)
March 2012
Applications of Q-LINKPAN-S (PAN)
Capable of reducing power consumption by ~30% compared to 60GHz products
Home, Office, Conference Room, Coffee Bar, Airport, etc.
Haiming Wang, Xiaoming Peng

8. Applications of Q-LINKPAN-L (LINK)
March 2012
Applications of Q-LINKPAN-L (LINK)
Point to Point
High gain antenna with very narrow beamwidth for both
Point to Multipoint
Usually, Q-LINKPAN-L is for commercial use.
Sector antenna for BS and narrow beamwidth antenna for UE
Haiming Wang, Xiaoming Peng

9. Haiming Wang, Xiaoming Peng
March 2012
Channel Model
Carrier frequency: Q band, 40~50 GHz
Channel model:
Path loss? ※
Multipath: Power delay profile (PDP)
Multiple Antennas: spatial correlation
Time-varying channel?
The channel model is one of key points for designing a wireless communication system!
We now use the channel models at 60 GHz as a reference in the initial design stage of Q-LINKPAN. Next, we will use the channel model at Q-band based on measurement data.
The exact frequency band for use and the channel allocation will be dependent on the spectrum policy of Q-band in China.
Haibing Yang, et al., “Channel Characteristics and Transmission Performance for Various Channel Configurations at 60 GHz,” EURASIP Journal on Wireless Communications and Networking, vol. 2007, Article ID 19613, 15 pages, 2007.
Haiming Wang, Xiaoming Peng

10. Atmospheric Absorption and Rain Attenuation
March 2012
Atmospheric Absorption and Rain Attenuation
Around 60 GHz
Around 60 GHz
Around
45 GHz
Around
45 GHz
Atmospheric absorption varies significantly with frequency, as shown in Figure 1. At conventional microwave frequencies, atmospheric attenuation is reasonably low, until a peak is seen at around 60 GHz where absorption by oxygen molecules results in 15 dB/km attenuation, seriously limiting radio-transmission distances.
As with all high-frequency radio propagation, rain will limit link distances. Q-band transmissions can experience about 26 dB/km attenuation when in the presence of intense rain, as shown in Figure 2.
Figure 1. Microwave and millimeter-wave atmospheric and molecular absorption [1]
Figure 2. Microwave and millimeter-wave rain attenuation [1]
45 GHz: 0.05~0.3 dB/km
62 GHz: 4~20 dB/km
[1] FCC Bulletin 70, Millimeter Wave Propagation: Spectrum Management Implications, July 1997.
Haiming Wang, Xiaoming Peng

11. Haiming Wang, Xiaoming Peng
March 2012
Path Loss
Path loss measurement results in 60 GHz WPAN systems:
High propagation loss is a big challenge in mmWave band!
The received power over the travel distance of the first arrived path, when the transmit power is 0 dBm. ※
Haibing Yang, et al., “Channel Characteristics and Transmission Performance for Various Channel Configurations at 60 GHz,” EURASIP Journal on Wireless Communications and Networking, vol. 2007, Article ID 19613, 15 pages, 2007.
Haiming Wang, Xiaoming Peng

12. Initial Channel Measurement at Q-band: Parameters
March 2012
Initial Channel Measurement at Q-band: Parameters
Frequency band: 40~43.5 GHz
Method: VNA Sweep Frequency
Sweep Frequency Points: 12801
Sweep Frequency Duration: 300 ms
TX Power: 20dBm
Cable Length: 4 m at both ends
Antenna Type: Horn antenna
Measurement Scenario: Indoor
Haiming Wang, Xiaoming Peng

13. Initial Channel Measurement at Q-band: Scenarios
March 2012
Initial Channel Measurement at Q-band: Scenarios
S1: Horn antennas are face-to-face without block. The TR distance is 3 m and height is 1.15m.
S2: Horn antennas are toward the ceiling without block. The TR distance is 3 m.
S3: Horn antennas are face-to-face across a glass window door. The TR distance is 3 m and height is 1.15m.
S4: Horn antennas are face-to-face across a fiberboard door. The TR distance is 3 m and height is 1.15m.
Haiming Wang, Xiaoming Peng

14. Initial Channel Measurement at Q-band: Scenarios
March 2012
Initial Channel Measurement at Q-band: Scenarios
S5: Horn antennas face to the bookcase. The transmitted signal is reflected by the bookcase. The TR distance is 3 m and height is 1.15m.
S6: Horn antennas are face-to-face across a concrete wall with thickness 24 cm. The signal loss is greater than 35 dB. The VNA can not receive any signal. So no data have been recorded.
Haiming Wang, Xiaoming Peng

15. Initial Channel Measurement at Q-band: Path Loss
March 2012
Initial Channel Measurement at Q-band: Path Loss
The average path loss is about 25 dB at the Tx-Rx distance 3 m. The dynamic range of received signal is about 35 dB.
Haiming Wang, Xiaoming Peng

16. Initial Channel Measurement at Q-band: Multipath PDP
March 2012
Initial Channel Measurement at Q-band: Multipath PDP
S1: Face-to-Face, no block
S2: toward to the ceiling
From the results, only the main path component exits in the LoS scenario (S1) and the simple reflection surface (S2) , and the path component at 45 ns is due to the second reflection in the S1.
Haiming Wang, Xiaoming Peng

17. Initial Channel Measurement at Q-band: Multipath PDP
March 2012
Initial Channel Measurement at Q-band: Multipath PDP
S3: Across a glass window door
S4: Across the fiberboard door
S5: Reflection by the bookcase
The multipath distribution are different due to the penetrating characteristics between the glass window door and the fiberboard door. There is second reflection component at 60 ns since there is metallic structure in the glass window door. No such phenomenon is observed for the fiberboard door.
There are several multipath components in the scenario S5 since the reflection surface consisting of metallic and non-metallic materials is complex.
Haiming Wang, Xiaoming Peng

18. Initial Channel Measurement at Q-band: RMS Delay Spread
March 2012
Initial Channel Measurement at Q-band: RMS Delay Spread
Scenario S1 S2 S3 S4 S5
Mean (ns)
2.70
0.38
5.19
0.53
1.22
Min (ns)
2.39
0.32
4.06
0.51
1.15
Max (ns)
2.87
0.40
5.35
0.54
1.24
Haiming Wang, Xiaoming Peng

19. Relationship between IEEE 802.11 CMMW and CWPAN Q-LINKPAN
March 2012
Relationship between IEEE CMMW and CWPAN Q-LINKPAN
From CWPAN perspective
From CMMW perspective
Haiming Wang, Xiaoming Peng