Cambridge Wireless Radio Technology SIG 8 th July 2015 Geoff Carey. Air Division Duplexing doubles Transmission Capacity for Microwave Backhaul

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1 + Cambridge Wireless Radio Technology SIG 8 th July 2015 Geoff Carey Air Division Duplexing doubles Transmission Capacity for Microwave Backhaul

2 + 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

3 + Background to LOS MIMO D Optimal antenna separation (h optimal ) depends on range and frequency 1 h 1 h 2 h optimal Sub-optimal separation degrades performance based on the ratio of the real to optimal separation when implemented (h/h optimal ) 2 1 Chalmers University of Technology EX064/ Boosting Microwave Capacity Using Line of Sight MIMO Technical Brief from Ceragon 2013 MIMOtech (Pty) Ltd. All rights reserved. Specifications subject to change without notice.

4 + From LOS MIMO to Air Division Duplexing. MIMOtech registers LOS MIMO patent (2013) StarBurst Family of MIMO radios developed & 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

5 + LOS MIMO from Competitors Ericsson 4x4 MIMO (2012/2013) 3 m Market Reaction 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

6 + 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

7 + Janus AirDuplex TM

8 + How it Works Traditional Microwave Links LB HB Transmitter Spectrum LB V H Receiver Spectrum LB V HB HB Operating Modes: Frequency Division Duplexing (Without / CCDP With on either LB or HB frequencies) Transmitter Spectrum LB V H Receiver Spectrum LB V HB HB H H

9 + How it Works - AirDuplex TM Mode With CCDP Transmitter Spectrum LB V HB Operating Modes: Air Division Duplexing (With CCDP on both LB and HB frequencies) Transmitter Spectrum LB V HB H Receiver Spectrum LB V HB H Receiver Spectrum LB V HB H H

10 + Transmission Basics Transmit Signal Self- Interference Reflected Signal Received Signal 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)

11 + Tx to Rx Isolation Requirements versus Range Isolation Achieved > 120 db

12 + Inside the Janus Air Duplex TM

13 + Inside the Janus..

14 + Janus L2 Full Duplex Throughput (each direction) 28 MHz Channelization: QAM QAM QAM 56 MHz Channelization: QAM QAM QAM

15 + Opportunities for Air Division Duplexing (ADD) Operator/Vendor Perspective 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 fiberlike throughput performance. Double the throughput or longer range when compared to other solutions available. Regulatory 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

16 + Challenges with ADD Operator/Vendor Perspective 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 Regulatory 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.

17 + 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.

18 + MIMOtech Physical Address: South Africa 64 White Rd, Retreat, Cape Town, RSA Tel: Fax: , Web & Social: