ip20c mimo

October 2014, ver6

IP-20C MIMO link

Proprietary and Confidential

Agenda

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• Line-of-Sight (LOS) MIMO

• LoS MIMO Benefits

• LOS MIMO Theory of Operation

• Installation of 2x2 MIMO link

• Configuration MIMO 2x2

• Installation of 4x4 MIMO link

• Configuration MIMO 4x4

• MIMO Recovery Mechanism

• Utilizing MIMO Configuration for Space Diversity

• 1+0 SD

• 2+0 SD


Enhanced by Multi-Core innovation

FibeAir IP-20C Sets a New Standard in Microwave Transmission

LoS 4x4 MIMO Quadruples radio throughput using the same

spectrum, at half the form-factor

LoS: Line-of-Sight

MIMO: Multiple-Input & Multiple-Output

3

Proprietary and Confidential 4

• Using antenna separation to achieve uncorrelated receiver streams

• At each site the original data is split into 4 bit streams

• Two antennas, two polarization on each

• The receiver is able to distinguish between the streams due to a phase

difference caused by the antenna separation.

• Transmitting and receiving utilizing

the same frequency channel

Line-of-Sight (LOS) MIMO

Site 1 Site 2

V

H MIMO V

H


NLoS and LOS MIMO

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• NLoS MIMO originated as a non-line-of-sight (NLoS) technology, exploiting signal multi-

path caused by reflections from various physical obstacles by using multiple transmitters

and receivers to increase spectral efficiency by spatially multiplexing multiple bitstreams

over the same frequency channel.

• In LoS microwave, the non-LoS multipath signal is weak and unusable for the purpose of

MIMO. Instead, LoS MIMO achieves spatial multiplexing by creating an artificial phase de-

correlation by deliberate antenna distance at each site in deterministic constant distance.


LoS MIMO Benefits

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• Immunity to dispersive fading

• Similar to that achieved in space diversity

• Quadruple the capacity

• Compared to 1+0 SISO link

• System gain improvement

• Smaller Antennas

• Longer Links

• Spectrum decongestion


QUADRUPLING the Capacity Enabled by Multi Core Radio

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Switching ON MIMO

QUAD.

The

Capacity Mbps

Same

Link

Distance Km

Same

Antenna

Size ft

1+0 vs. 4X4 MIMO

1Gbps Radio Throughput on a 30/28MHz Channel

Ch1 V

Ch2 H

Ch1 V

Ch1 H


Ceragon’s Implementation of LoS MIMO

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• Using a single channel to quadruple the capacity

• 2 x Multi-Core units at each site

• Simple direct mount installation

4 x Capacity on the same Channel | 2Gbps radio throughput using a single 56MHz channel


System Gain Benefit using MIMO

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28MHz V

30/28MHz 30/28MHz

f1

452Mbps 4 x 133 = 532Mbps

f1 3dB Operating in MIMO

+ 11dB

1024 to 64QAM +

2dB Higher TX power

due to QAM change

16dB! Addition to System Gain

2+0 XPIC 4X4 MIMO

64 QAM 1024QAM


Spectrum Decongestion using MIMO

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1+0 SISO 2X2 MIMO

6 GHz Congested spectrum

MIMO

11 GHz Uncongested spectrum Link Parameters

20 miles 99.999% availability

30MHz channel Rain zone: K

256 QAM 32 QAM

MIMO

Additional Benefits

• 2 X 6 ft. Antennas 4 X 3 ft. antennas – • Lower tower weight load (up to 60% less weight)

• Lower tower wind load (up to 40% less wind load)

• Simpler and less expensive installation (need crane for 6ft. antenna)

• 200 Mbps 2 X 115 Mbps (15% more capacity) • Same spectral resources

3 ft.

3 ft.

6 ft.

200 Mbps

115 Mbps

15% more

115 Mbps


Site Optimization Using MIMO

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Future Proof – Doubling the Capacity with no Network Re-planning!

Switching ON MIMO

Double

Capacity Mbps

Double

Link

Distance Km

Same

Antenna

Size ft

2+0 XPIC vs. 4X4 MIMO


QUADRUPLING the Capacity

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XPN– Stretching the Network Capabilities

Switching ON MIMO

Quad

Spectral

Efficiency Bit/Hz

QAUD.

The

Capacity Mbps

Same

Link

Distance Km

Same

Antenna

Size ft

LOS MIMO Theory of Operation


LoS MIMO – Theory of Operation

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h1

h2

𝑑11

𝑑12

𝑑21

𝑑22

Signal A

Signal B

A + B

A - B

DSP

DSP

Description is for signal traversing from left to right. Link works in the same way from right to left.



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• The same signal will arrive at a different

phase in different antennas

• We control the phase by varying path

lengths (𝒅𝒊𝒋)

• Path lengths are configurable by

controlling antenna separation (𝒉𝟏, 𝒉𝟐)

• The following equation formulates the

antenna separation distance required for

optimal LoS MIMO operation

ℎ1 ∙ ℎ2 =𝐷 ∙ 𝑐

2𝑓

h1, h2: Antennas’ Separation [m]

D: Link Distance [m]

c: Speed of Light 3 × 108 m

sec

f: Link Frequency [Hz]



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• Sub-Optimal (𝒉 ≠ 𝒉𝒐𝒑𝒕𝒊𝒎𝒂𝒍) antenna separation on one

side can be offset by proper antenna separation on

opposite side

• A continuum of optimal installation scenarios

ℎ1 ∙ ℎ2 =𝐷 ∙ 𝑐

2𝑓

Special case: 𝒉𝟏 = 𝒉𝟐 ≝ 𝒉𝒐𝒑𝒕𝒊𝒎𝒂𝒍

𝒉𝒐𝒑𝒕𝒊𝒎𝒂𝒍 =𝑫 ∙ 𝒄

𝟐𝒇


LoS MIMO installation

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Horizontal Separation

Vertical Separation

Must be consistent


MIMO 4x4 Technology

Ceragon’s MIMO technology is simple to deploy

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Optimal Antenna Separation Capacity vs. Antenna Separation

Achieving 70% of max capacity at half the optimal

antenna separation (On both ends!)

Link distance [km]

Op

tim

al A

nte

nn

a S

ep

ara

tio

n [

m]

Installation of 2x2 MIMO link


Link Commissioning without MIMO

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• Make link commissioning and antenna alignment for the planned frequency first for the Master antenna, than for the

Slave antenna

• Antenna separation based on calculation for MIMO link

Port #1 f1

hoptimal hoptimal

Port #2 f1

Master Master

Slave Slave

Configuration MIMO 2x2


Create 2x2 MIMO group

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Enable MIMO

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• For 2x2 MIMO keep Role in Non-relevant mode

• Changing Admin State will cause unit reset


Make sure…- MIMO 2x2

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Common frequency channel for both carriers

XPIC group disabled

Multi Radio group disabled

ATPC disabled


MRMC script for MIMO

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• Make sure MIMO group already configured and enabled

• The same kind of MRMC script will be configured automatically

on the second carrier


Final confirmation

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Check Active Alarms for NO alarms regarding to MIMO configuration

Installation of 4x4 MIMO link


Link Commissioning without MIMO

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• Make link commissioning and antenna alignment for the planned frequency first when

Master is transmitting only, than when Slave is transmitting only for Single polarization

• Antenna separation based on calculation for MIMO link

f1

f1

hoptimal hoptimal

Master Master

Slave Slave


Cabling for 4x4 MIMO

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Source Sharing

Prot MNG

Data Sharing


IP20C 4x4 MIMO

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OMT

OMT

Local MNG

Source sharing coax cable with TNC connector

Data sharing Eth#3 SFP opt

Traffic VID

10, 20

Traffic VID 10, 20 Eth#1

Traffic VID 20 Eth#2

MNG Protection via Protection

splitter Y cable


Cables for MIMO Connections

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Marketing P/N Description

DATA_SHRNG_KIT_5m CABLE,SFP,4x4MIMO_DATA_SHARING_KIT_5M




SOURCE_SHARING_5M Source_Sharing_5m




IP-20_MIMO_Prot_ mng_cbl_5m IP-20C MIMO or Prot management cable 5m




IP-20_MIMO_Prot_ mng_spltr IP-20C MIMO or Prot management odu spltr

Configuration MIMO 4x4


4x4 MIMO group

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Enable MIMO

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• For 4x4 MIMO configurations, select Master or Slave in the Role field

• Changing Admin State will cause unit reset


Make sure…- MIMO 4x4

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Common frequency channel for both carriers

XPIC group disabled

Multi Radio group enabled

ATPC disabled


Final confirmation

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Check Active Alarms for NO alarms regarding to MIMO configuration

MIMO Recovery Mechanism


Switching Trigger

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Switching into Half capacity mode is done when there

is problem with:

• Radio Hardware

• Source Sharing connection

• Data Sharing connection

• MNG Protection connection

OMT

OMT

Traffic VID

10, 20


Half Capacity MIMO

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Half capacity


MIMO Status via CLI

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• You can check status of all MIMO connection via CLI access

Utilizing MIMO Configuration for Space

Diversity

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MIMO configuration for SD

FibeAir IP-20C’s MIMO capabilities can also be utilized, with minor

adjustments, to provide Baseband Combining (BBC) Space Diversity (SD).

An SD configuration is based on either a 2x2 MIMO installation (for 1+0 SD)

or a 4x4 MIMO installation (for 2+0 SD, using two IP-20C units), with

antenna separation based on SD requirements.

• the transmitter connected to the diversity antenna is muted to achieve a

configuration that consists of a single transmitter and two receivers

• When IP-20C is configured for SD operation, the signal is combined at the

Baseband level to improve signal quality selective fading

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1+0 Space Diversity

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• Single IP-20C on each side of the link, with both radio carriers activated.

• The second carrier is muted.

• On the receiving side, the signals are combined to produce a single, optimized signal

• Configuration based on 2x2 MIMO configuration but with antenna separation based on SD

requirements

Carrier 1

Carrier 2

(Muted)

Carrier 1

Carrier 2

1+0 SDX


2+0 Space Diversity

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• Two IP-20C units on each side of the link, with both radio carriers activated in each unit

• Both carriers of the slave unit are muted

• On the RX side, each unit receives a dual polarization signal from the remote master unit,

which includes the data streams from both carriers

• The slave unit shares the data stream it receives with the master unit, and the master unit

combines each data stream to produce a single, optimized signal for each carrier

• Configuration based on 4x4 MIMO configuration but with antenna separation based on SD

requirements

H

V

V

H

2+0 SD

X Muted

Master

Slave

Master

Slave

Data Sharing

Cable

Thank you

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ip20c mimo

Documents

sight mimo

mimo configuration

nlos mimo

purpose of mimo

confidential los mimo

sight los mimo site

xpic 4x4 mimo

congested spectrum mimo