Division Duplexing Radio Technology SIG Capacity … Technology SIG ... Capacity for Microwave ... 2 Boosting Microwave Capacity Using Line of Sight MIMO –Technical Brief from Ceragon

+

Cambridge Wireless

Radio Technology SIG

8th July 2015

Geoff Carey

“Air Division Duplexing

doubles Transmission

Capacity for Microwave

Backhaul”

+About MIMOtech

Technology company founded in July 2011

Patents

Line of Sight MIMO (2013)

Air Division Duplexing (2014)

Expertise

Microwave and Millimeterwave design

Software defined radio design

Firmware and software development

Vision

“To be the leader in the development and commercialization of high spectral efficiency wireless communication solutions and to maintain this lead by continually developing new and innovative technologies.”

Locations

Headquartered in Cape Town, RSA

Sales in Canada, US and UK

2015/07/01© 2015 MIMOtech (Pty) Ltd. All rights reserved. Specifications subject to change without notice.

+Background to LOS MIMO

Optimal antenna separation (hoptimal)

depends on range and frequency1

Sub-optimal separation degrades

performance based on the ratio of the

real to optimal separation when

implemented (h/hoptimal)2

© 2013 MIMOtech (Pty) Ltd. All rights reserved. Specifications subject to change without notice.

hoptimal

h1 h2

D

1 Chalmers University of Technology EX064/20092 Boosting Microwave Capacity Using Line of Sight MIMO – Technical Brief from Ceragon

+From LOS MIMO to Air Division

Duplexing….

MIMOtech registers LOS MIMO patent (2013)

StarBurst Family of MIMO radios developed & demonstrated @ CTIA (2x2 to 4x4 MIMO)

Technically a success but market reaction negative:

Large (>2m overall)

Multiple Antennas apertures increase Opex costs

Range Limit imposed by LOS MIMO


1.5 m

+LOS MIMO from Competitors

Ericsson 4x4 MIMO (2012/2013) Market Reaction


≈ 3 m

Large Separations required for useful MIMO operation

Implementation complexity

Not always possible to achieve desired separation

Dual Radios/Antennas per site

2 x Apertures (tower rentals)

2 x Spectrum Licenses required because it is two units albeit on the same frequency

+Air Division Duplexing

Addressing the Challenges… Size

Length 0.9m

Height 0.3m

Single Antenna Aperture

Common Radome structure

Antenna Separation

variable in LOS MIMO

Separate Tx and Rx antennas

Achieve the Capacity Gains

that MIMO offers

Combine:

2x2 MIMO (“XPIC”); and

Simultaneous Tx/Rx


+ Janus AirDuplexTM


+How it Works –

Traditional Microwave Links


Operating Modes:

Frequency Division

Duplexing (Without

/ CCDP on

either LB or HB

frequencies)

LB HBV

H

LB HBV

H

Transmitter Spectrum

Receiver Spectrum

LB HBV

H

LB HBV

H


Receiver Spectrum

“LB”“HB”

With

+How it Works - AirDuplexTM Mode

With CCDP


LB HBV

H

LB HBV

H


Receiver Spectrum

Operating Modes:

Air Division

Duplexing (With

CCDP on both LB

and HB frequencies)LB HBV

H

LB HBV

H


Receiver Spectrum

+Transmission Basics

Interference Countermeasures:

Interference Rejection as per normal Microwave Systems

Self-Interference managed through construction and active cancellation (Reflection Interference Canceller)

Reflected Signals (own transmission) managed through active cancellation (Reflection Interference Canceller)


Transmit Signal

Reflected

Signal

Self-

Interference

Received

Signal

+Tx to Rx Isolation Requirements

versus Range


Isolation

Achieved

> 120 dB

+ Inside the Janus Air DuplexTM


+ Inside the Janus..


+ Janus L2 Full Duplex Throughput

(each direction)

28 MHz Channelization:

460 Mbps @ 64QAM

650 Mbps @ 256QAM

1050 Mbps @ 1024QAM

56 MHz Channelization:

920 Mbps @ 64QAM

1300 Mbps @ 256QAM

2100 Mbps @ 1024QAM


+Opportunities for Air Division

Duplexing (ADD)

Throughputs of around 1 Gbps in Freq Bands with 28 MHz channelization (typically those below 42 GHz) for upgrades or replacements of low capacity links.

Provides an alternative to millimeterwave links to achieve the required “fiber-like” throughput performance.

Double the throughput or longer range when compared to other solutions available.

Frequency allocation does not

change with ADD

Operators pay for both go &

return frequency channels

currently

Both go and return are

allocated to a particular link

= Evolutionary Change

Operator/Vendor Perspective Regulatory


+Challenges with ADD

Improved link planning

required to manage potential

interference. This is the

capacity trade-off

Channel allocation simplified

in cases where the band is not

shared with other operators

MNOs/Telcos need to lobby

with Vendors to get Regulatory

acceptance

Frequency Assignment will be challenged:

Need for 3D assignment instead of fixed HB/LB site definitions (2D assignment)

= move toward self-assignment of spectrum by the licensee.

Some Regulators accept “Dirty” sites or “Bucking” in certain Freq bands

= Inevitable consequence of the increased microwave link density as ranges decrease.

Operator/Vendor Perspective Regulatory


+Conclusions

Air Division Duplexing

doubles microwave

backhaul throughput

Opportunity to use Freq

bands below 42 GHz to

achieve multi-gigabit

transmission.

Replacement of legacy low

capacity links instead of

shifting to millimeterwave

frequencies

Regulatory impact of the

technology:

Frequency allocation and

channelization remains

unchanged

Legacy HB/LB assignment

will be challenged as both

frequencies used from both

sites.


+MIMOtech

Email, Web & Social:

[email protected]

www.mimotechnology.com

@MIMOtech1

Physical Address:

South Africa

64 White Rd, Retreat,

Cape Town, RSA

Tel: +27 21 710 2463

Fax: +27 21 710 2569

© 2015 MIMOtech (Pty) Ltd. All rights reserved. Specifications subject to change without notice. 2015/07/01

mailto:[email protected]

http://www.mimotech.co.za

Documents

Division Duplexing Radio Technology SIG Capacity … Technology SIG ... Capacity for Microwave ... 2 Boosting Microwave Capacity Using Line of Sight MIMO –Technical Brief from Ceragon