Submission

doc.: IEEE 802.11-15/0069r0January 2015

Amichai Sanderovich, QualcommSlide 1

MIMO option for NG60Date: 2015-01-11

Name Affiliations Address Phone email Amichai Sanderovich

Qualcomm +972-52-8513940 amichais@qti.qualcomm.com

Authors:

Submission

doc.: IEEE 802.11-15/0069r0

• NG60 looks for several options to increase bitrate• MIMO allows higher bit-rate, without taking more bandwidth

• MIMO is a simple extension to an exiting antenna array

• We propose a MIMO option that works well also in LOS – based on polarization

• Capacity results are presented• We do not go into implementation details such as coding,

constellations, equalizers at this time

• A practical array is assumed

Motivation and purpose

January 2015

Amichai Sanderovich, QualcommSlide 2

Submission

doc.: IEEE 802.11-15/0069r0January 2015

Amichai Sanderovich, QualcommSlide 3

Setup• Single array

• 8 dual-feed patch elements:• Each element can be used with horizontal polarization, vertical

polarization, or combined.

• All vertical feeds and all horizontal feeds are combined to form two spatial streams

Double feed arrayBB

processingDouble feed array BB

processing Data OutData In

Submission

doc.: IEEE 802.11-15/0069r0

• Setup is based on an existing 802.11ad array with dual polarization• Single spatial stream

• Small FF, for mobile devices

• Element patterns were measured

• These measurements are used for two spatial streams in the simulated setup

• Shannon-capacity is presented, no overheads, Gaussian constellation.

• 802.11ad devices work ~5 dB from capacity

Setup features

January 2015

Amichai Sanderovich, QualcommSlide 4

Submission

doc.: IEEE 802.11-15/0069r0

• Bore-sight to bore-sight

• Transmitter/receiver use calibrated sectors for transmitting with horizontal and vertical polarizations

Shannon capacity:

1. Closed loop: • Transmitter and receiver use singular vectors

• Exact channel measurement feedback

2. Open loop: • Transmitter and receiver use predefined configured sectors

• Transmitter sends one spatial stream from horizontal-pol and one spatial stream from vertical-pol

3. Double channel: uses the same setup, with double channel

4. SISO: use only single stream, as existing 802.11ad

Simulation features

January 2015

Amichai Sanderovich, QualcommSlide 5

Submission

doc.: IEEE 802.11-15/0069r0

• Difference between horizontal and vertical antenna gains is -1.2 dB

• Polarization correlation (V-H, and H-V) is -9.5,-13.5 dB

Resulting channel between streams

January 2015

Amichai Sanderovich, QualcommSlide 6

5 10 15 20 25 300

10

20

30

40

50

60

70

SNR [dB]

Cap

acity

[G

bps]

Close loop MIMO - 1.76GHz

Open loop MIMO - 1.76GHz (calibrated sectors)

SISO - 1.76GHzClose loop MIMO - 3.92GHz

Open loop MIMO - 3.92GHz (calibrated sectors)

SISO - 3.92GHz

5 10 15 20 25 30

1.3

1.4

1.5

1.6

1.7

1.8

1.9

2

SNR [dB]

Mul

tiplic

ity

Close loop MIMO

Open loop MIMO

Submission

doc.: IEEE 802.11-15/0069r0

• Polarization based MIMO was analyzed

• It provides an effective way to double bit-rate, at modest SNRs

• Works also for LOS channels

• Can be done with small arrays

• A cost-effective way reaching 20Gbps MAC-SAP: double channel, polarization MIMO 2x2 gets 30Gbps for 15 dB SNR

Summary

January 2015

Amichai Sanderovich, QualcommSlide 7