Physical Channel Considerations
for 802.11aj 60GHz Band
Chinese Wireless Personal Area Network Standardization Group
Outline
• 60GHz spectrum resources in China and worldwide
• Channelization for 802.11aj 60GHz band
• Realization of millimeter wave transceiver
• Conclusion & Ref
60GHz Spectrum in China
Released by MIIT in [2006] 82 for micro power, short range applications.
Frequency range: 59-64GHz
Transmit Power:
• Maximum Transmit Power: 10dBm
• Limit of Peak Effective Isotropic Radiated Power : 47dBm
• Limit of Average Effective Isotropic Radiated Power : 44dBm
• EIRP: 57-59GHz & 64-66GHz, -5dBm / MHz
60GHz Spectrum Allocation Worldwide
• The released 60GHz spectrum in China only has 5GHz bandwidth,
corresponding to channel 2 & 3 used in IEEE 802.11ad/WiGig.
• According to CWPAN 60GHz functional requirement document, it is required
to support at least 3 logical channels for CWPAN network.
USA, Canada, Korea
Europe
Japan
China
Australia
Justification to support at least 3 logical
channels
Two channel can’t work
Three channel can work
Four channel can work
Outline
• 60GHz Spectrum resources in China and worldwide
• Channelization for 802.11aj 60GHz band
• Realization of millimeter wave transceiver
• Conclusion & Ref
Proposed channel allocation for 11aj 60GHz
1. Six logical channels are supported.
2. Two 2.16GHz channels, which are
compatible with 11ad devices.
3. Four 1.08GHz channels, which are
more suitable for low power
terminal devices such as smart
phones and Tablets.
4. Flexible bandwidth mode for
different applications with
acceptable cost.
Outline
• 60GHz Spectrum resources in China and worldwide
• Channelization for 802.11aj 60GHz band
• Realization of millimeter wave transceiver
• Conclusion & Ref
Differences between 11ad and 11aj
millimeter wave transceiver design
• For low noise amplifier 、 power amplifier 、 Mixer 、 Up
converter，there are no differences between 11ad and 11aj.
• For frequency synthesizer,
11aj need to generate extra
59.94GHz，61.02GHz, 62.1GHz, 63.18GHz frequencies except
for 60.48GHz and 62.64GHz in 11ad.
• 3、For variable gain amplifier and low pass filter, 11aj need
to offer two bandwidths：1.08GHz and 540MHz.
• 4、For ADC and DAC，11aj could use the 11ad design.
11aj millimeter wave transceiver
-direct conversion
59-64GHz
LNA
1.08GHz/540
MHz VGA
1.08GHz/540
MHz LPF
59-64GHz I,Q
Demodultor
I,Q
I,Q
2.16Gsps
ADC
I,Q
I,Q
ADC
LNA
I,Q
Antenna
59-64GHz
Switch
Base
59-64GHz
Frequency Synthesizer
band
59-64GHz
BPF
I,Q
DAC
PA
I,Q
59-64GHz 59-64GHz I,Q
PA
Upconverter
I,Q
1.08GHz/540
MHz LPF
1.08GHz/540
MHz VGA
I,Q
I,Q
2.16Gsps
ADC
11aj millimeter wave transceiver
-double conversion
59-64GHz
LNA
Downconverter
IF BPF
IF Amplifer
IQ
IF
Amplifer
LNA
1.08GHz/540
MHz VGA
1.08GHz/540
MHz LPF
Demodultor
2.16Gsps
ADC
I,Q
IQ
IQ
ADC
IQ
Antenna
Base
Frequency Synthesizer
59-64GHz
Switch
band
59-64GHz
BPF
IF Amplifer
IF BPF
IQ
IF
Amplifer
PA
DAC
IQ
59-64GHz
PA
Upconverter
Modulator
IQ
1.08GHz/540
MHz LPF
1.08GHz/540
MHz VGA
IQ
I,Q
2.16Gsps
ADC
11aj frequency synthesizer
59.94GHz
QVCO
40M
/8
60.48GHz
PFD
CP
I,Q
LPF
61.02GHz
62.1GHz
111/112/113/115/116/117
/27
/4
62.64GHz
63.18GHz
For direct conversion transceiver
39.96GHz
VCO
40M
/8
40.32GHz
PFD
CP
LPF
40.68GHz
41.4GHz
111/112/113/115/116/117
/9
/4
/2
41.76GHz
42.12GHz
19.98GHz 20.16GHz 20.34GHz 20.7GHz 20.88GHz 21.06GHz
For double conversion transceiver
11aj Low Pass Filter
• If we have a 1.08GHz bandwidth low pass filter for 2.16GHz
channel(11ad), it is easy for us to change the bandwidth to
540MHz for the 1.08GHz channel(11aj).
• Take the active-RC filter as an example, and what we need to
do is to change the capacitor value for bandwidth change.
R5
C1
C2
V1
R2
R1
C2
R4
R3
R5
Vin
Vout
R3
R1
R2
C1
R5
R4
C2
C2
R5
Outline
• 60GHz Spectrum resources in China and worldwide
• Channelization for 802.11aj 60GHz band
• Realization of millimeter wave transceiver
• Conclusion & Ref
Conclusion
• Two 2.16GHz channels and four 1.08GHz channels for
China’s 59-64GHz spectrum will be compatible with the
11ad devices, and also make it flexible for different
applications , especially for low power mobile terminals.
• For millimeter wave transceiver design, the coexistence
of 2.16GHz band and 1.08GHz band will not add too
much cost.
Reference
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[3] Mohammad Fakharzadeh, Mohammad-Reza Nezhad-Ahmadi, Behzad Biglarbegian, JavadAhmadi-Shokouh,
Safieddin Safavi-Naeini, “CMOS Phased Array Transceiver Technology for 60GHz Wireless Applications”,
IEEE Trans on Antennas and Propagation, VOL.58, NO.4, APR2010.
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[5] Alberto Valdes-Garcia, Sean Nicolson, Jie-Wei Lai, Arun Natarajan, Ping-Yu Chen, Scott Reynolds, Jing-Hong
Conan Zhan, Brian Floyd, “A SiGe BiCMOS 16-Element Phase-Array Transmitter for 60GHz
Communications”, ISSCC2010, Session11.
[6] Arun Natarajan, Scott K.Reynolds, Ming-Da Tsai, Sean T.Nicolson, Jing-Hong Conan Zhan, Dong Gun Kan,
Duixian Liu, Yen-Lin Oscar Huangm, Alberto Valdes-Garcia, Brian A.Floyd.“A Fully Integrated 16-Element
Phased-Array Receiver in SiGe BiCMOS for 60GHz Communications”, IEEE JSSC, VOL.46,NO.5, MAY2011.
Thanks!