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Submission
doc.: IEEE 11-13/0408r0November 2013
Gal Basson, WilocitySlide 1
Beyond 802.11ad – Ultra High Capacity and Throughput WLAN
Name Affiliations Address Phone email
Gal Basson Wilocity [email protected]
Cordeiro Carlos Intel Cordeiro,[email protected]
Rolf De Vegt Qualcomm [email protected]
Gaius Yao Huang Wee Panasonic [email protected]
James Yee Mediatek [email protected]
Sven Mesecke Nitero [email protected]
Ismail Lakkis Tensorcom [email protected]
Sai Nandagopalan Adeptence [email protected]
Brad Lynch Peraso Technologies
Lochan Verma Peraso Technologies
Uri Parker Wilocity [email protected]
Amichai Sanderovich Wilocity [email protected]
Huang Lei Panasonic [email protected]
James Wang Mediatek [email protected]
Authors:
Submission
doc.: IEEE 11-13/0408r0November 2013
Gal Basson, WilocitySlide 2
Abstract
We want to initiate the discussion about creating a new Study Group to explore modifications to the IEEE 802.11ad-2012 PHY and MAC layers, so that modes of operation in the 60 GHz band (57-66 GHz) can be enabled that are capable of a maximum throughput of at least 30 Gbps as measured at the MAC data service access point (SAP), while maintaining the excellent capacity attribute of the 60GHz band.
Submission
doc.: IEEE 11-13/0408r0
Gal Basson, Wilocity
Agenda
• 802.11ad Radio/Antenna implementations
• Existing 802.11ad systems capacity
• Beyond 802.11ad• High data rates usages
• Channel bonding at 60GHz
• MIMO options for 60GHz• Traditional MIMO
• “Spatial orthogonal MIMO”
• Possible achievable rates in 60 GHz
Slide 3
November 2013
Submission
doc.: IEEE 11-13/0408r0
Gal Basson, Wilocity
802.11ad Antenna implementation
• 32 antennas- 17.5x7.9mm, 3D radiation
• Not using tradition planner array• Can form orthogonal streams
Slide 4
November 2013
Single Wi-Fi antenna
60GHz 32 antenna array
Submission
doc.: IEEE 11-13/0408r0
Gal Basson, WilocitySlide 5
November 2013
Submission
doc.: IEEE 11-13/0408r0
Gal Basson, Wilocity
Existing 802.11ad systems capacity
• 60GHz transmission is directive• Beam width depends on the antenna implementation and can be
narrow ( 10 degrees)
• Directivity in many situations dramatically reduces or eliminates OBSS interference
• Directivity increases the network capacity
• Simulation test case• Hall size 20x20x2.5 meters (65x65x8.2 feet)
• 48 Wireless pairs (Different BSSs), 96 transceivers
• All pairs use the same channel (auto channel is also available)
Slide 6
November 2013
Submission
doc.: IEEE 11-13/0408r0
Gal Basson, Wilocity
802.11ad capacity example
• Room dimension• 20mx20m
• 48 pairs (PBSSs)• Client and AP
• 96 transceivers
• 2 meters separation
• Propagation model• 60 GHz is using ray tracing
simulation
• BF and TPC were used
• Simulation result• TPT per user
• Aggregated TPT of the entire network
Slide 7
November 2013
Network topology
Submission
doc.: IEEE 11-13/0408r0
Gal Basson, Wilocity
802.11ad capacity example
• Aggregated TPT across all PBSSs: ~200 Gbps!
Slide 8
November 2013
• Efficiency• Efficiency= aggregated TPT/Maximum
achievable TPT
• Overall efficiency ~90%!
Submission
doc.: IEEE 11-13/0408r0
Gal Basson, Wilocity
Results
• The 11ad capacity is high due to the following:• 11ad operating SNR is on the order of 10 dB
• 11ad 4.6 Gbps requires 13 dB SNR
• Less sensitive to Interference• SINR required is ~20 dB
• Directivity reduces OBSS interference
• One more small detail• Directivity with steering ability can only be achieved with
an array of antennas (unless we use a motor )
• http://www.youtube.com/watch?v=4M4ngJsQF70
Slide 9
November 2013
Submission
doc.: IEEE 11-13/0408r0
Gal Basson, Wilocity
Beyond 11ad
Slide 10
November 2013
Submission
doc.: IEEE 11-13/0408r0
Gal Basson, Wilocity
High data rates usages
• Display• DisplayPort Data rates:
• 2 screens support is baseline today
• HDMI 2.0 support ultra HD or 4k• Data rates up to 20 Gbps
• Wired bus• USB 3.1 speed is 10 Gbps
• http://www.engadget.com/2013/08/01/usb-alliance-finalizes-10gbps-specification-as-usb-3-1/
• PCIe gen 4.0 goes all the way till 16 GT/s
• Thunderbolt 1.0: 10Gbps per lane
• Assuming docking needs to have a display and a wired bus: > 10 Gbps per dock!
Slide 11
November 2013
Submission
doc.: IEEE 11-13/0408r0
Gal Basson, Wilocity
Channel bonding at 60 GHz
• Channel bonding can be done with minor algorithmic complexity on the PHY• Bond 2 or 4 channels.
• SC: modem can double the chip rate, or even slightly more to fill the channel gaps
• OFDM: can simply double the number of tones and fill the channel frequency spacing, or can double the sub carrier spacing (maintain the sane number of tones)
• Pros and cons can be debated later
• Control PHY increasing the rate is definitely not a requirement, suggest to increase sensitivity
• MAC changes will require effort• Coexistence under directivity
Slide 12
November 2013
Submission
doc.: IEEE 11-13/0408r0
Gal Basson, Wilocity
Channel bonding feasibility
• Obviously 60GHz RF is wide enough to support the 4 available channels today• Assuming the above, no change in the RF
• ADC/DAC: looking into the literature Figure of merit (FOM)• Digitally assisted ADCs are
common in the industry
• ADCs running in 5GHz BW, assuming 6 bits
• Power estimated is 32 mW
Slide 13
November 2013
Submission
doc.: IEEE 11-13/0408r0
Gal Basson, Wilocity
MIMO (>1 stream) at 60 GHz
• Reminder: 4.6 Gbps can be achieved at 13 dB SNR
• “Traditional” MIMO is feasible at 60GHz• Channel feedback is already
supported in 802.11ad
• Multi antenna array is also supported
• Full SVD:
• Can we create “spatial orthogonal streams”• A diagonal channel matrix on the receiver
Slide 14
November 2013
Tablet integrated with 4 arrays
Secto
r #1
Sector #2
Sector #3Sector #4
Sector #N
Sector #1Sector #2
Sector #3Sector #4
Sector #N
RED – best ray and best pair of TX-RX sectorsGreen – second best pair of sectors
Blue – third best pair of sectors
TX RX
Submission
doc.: IEEE 11-13/0408r0
Gal Basson, Wilocity
MIMO at 60 GHz: can we simplify?
• Reminder: 4.6 Gbps can be achieved at 13 dB SNR
• Can we create “spatial orthogonal streams”• A diagonal channel matrix on the receiver
• 60 GHz require 10 dB SNR for decoding 3Gbps
• Training should be done via BF mechanismSector sweep and BRP
• Low cost/complexity receiver• lower digital complexity
Slide 15
November 2013
Secto
r #1
Sector #2
Sector #3Sector #4
Sector #N
Sector #1Sector #2
Sector #3Sector #4
Sector #N
RED – best ray and best pair of TX-RX sectorsGreen – second best pair of sectors
Blue – third best pair of sectors
TX RX
Signal #1 Signa
l #2
Σ Σ
Antenna elements
RF signal Summators (RX)
or Multiplexors (TX)
Radio frequency to Baseband
transformation
RFToBB
RFToBB
Phase shiftersΦ Φ Φ Φ Φ Φ Φ Φ
Σ Interference cancellation block
Channel estimation and
weights calculation
Antenna array #1 Antenna array #2
Σ
Submission
doc.: IEEE 11-13/0408r0
Gal Basson, Wilocity
MIMO Channel measurement at 60GHz
• Planar array-16 elements
• Channel matrix was measured (16x16)• LOS and NLOS
• Antenna channel correlation-
• LOS-conductive 0.996-meaning all antennas see same channel
• LOS-0.724- not fully correlated
• Channel model D (IEEE 11n)- 0.4-0.5
Slide 16
November 2013
0 20 40 60 80 100 120 1400
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
LOS-planar array
Submission
doc.: IEEE 11-13/0408r0
Gal Basson, Wilocity
MIMO feasibility
• MIMO can be achieved in 60 GHz with lower complexity than legacy bands• By a much smaller footprint antenna
• Much lower digital complexity
• Even on a single array
• Protocol already have the infrastructure to support channel feedback, hence SVD
• Enhancing BF to support MIMO is needed
Slide 17
November 2013
Submission
doc.: IEEE 11-13/0408r0
Gal Basson, Wilocity
Example: rate table
Slide 18
November 2013
π/2-BPSK 1 SC 1/2 0.77 1.54 3.1π/2-BPSK 1 SC 3/4 1.155 2.31 4.6π/2-QPSK 1 SC 1/2 1.54 3.08 6.2π/2-QPSK 1 SC 3/4 2.31 4.62 9.2
π/2-16QAM 1 SC 1/2 3.08 6.16 12.3π/2-16QAM 1 SC 3/4 4.62 9.24 18.5
64QAM 1 OFDM 3/4 6.2 12.4 24.8π/2-BPSK 2 SC 1/2 1.54 3.08 6.2π/2-BPSK 2 SC 3/4 2.31 4.62 9.2π/2-QPSK 2 SC 1/2 3.08 6.16 12.3π/2-QPSK 2 SC 3/4 4.62 9.24 18.5
π/2-16QAM 2 SC 1/2 6.16 12.32 24.6π/2-16QAM 2 SC 3/4 9.24 18.48 37
64QAM 2 OFDM 3/4 12.4 24.8 49.6π/2-BPSK 4 SC 1/2 3.08 6.16 12.3π/2-BPSK 4 SC 3/4 4.62 9.24 18.5π/2-QPSK 4 SC 1/2 6.16 12.32 24.6π/2-QPSK 4 SC 3/4 9.24 18.48 37
π/2-16QAM 4 SC 1/2 12.32 24.64 49.3π/2-16QAM 4 SC 3/4 18.48 36.96 73.9
64QAM 4 OFDM 3/4 24.8 49.6 99.2
Modulation NSS PHY Code RateData Rate (Gbps)
BW=1.76GHz BW=3.52GHz BW=7.04GHz
Submission
doc.: IEEE 11-13/0408r0
Gal Basson, Wilocity
Summary
• The 60 GHz band can offer true capacity improvement for 802.11• 100 Gbps over wireless!
• 60 GHz directivity and its propagation characteristics enable high frequency reuse
• Channel bonding is more than feasible even in todays commodity design methods
• MIMO (>1 stream) can be realized with low complexity and low power
Slide 19
November 2013
Submission
doc.: IEEE 11-13/0408r0
Gal Basson, Wilocity
Straw polls
1. Would you like to hear more contributions on this topic at a future 802.11 mtg?
Slide 20
March 2013