03-2_ProfSvcs_SpectrumSurvey(JAN2008)

7/30/2019 03-2_ProfSvcs_SpectrumSurvey(JAN2008)

1/14

Copyright Alvarion Ltd.

Professional Services

Spectrum Survey Procedure

January 2008


2/14

ConfidentialInformation

2

Spectrum Survey Procedure

1


3/14


3

Agenda

Goals

Requirements

Measurement Methodology

Spectrum Analyzer Configuration

Location for MeasurementsSpectrum Survey Procedure

Data Collection

Significant Observations

Report Document - Template


4/14


4

Goals

The Spectrum Survey will gather detailed information for each

proposed Base Station (BST) location participating in aBroadband Wireless Deployment.

The spectrum site survey will help understand and define the

following:

Identify potential sources of interference and help determine its viability

and usage in each location.Learn the signal and noise floor levels for each BST.

Collect the measurement and utilize these as an input to the radio

network plan.


5/14


5

Requirements

General

1 GPS unit with Serial/USB cable (PC)1 Compass

1 Digital Photo Camera

Spectrum Analysis

1 portable Spectrum Analyzer unit up to 6 GHz with a built-in 30 dB pre-amplifier.

Unit must have capability to save screen captures in digital format. I.e. jpeg.

1 sector antenna, 60, 90 or 120 degree (2.3, 2.5, 3.5, or 3.6 GHz)

Automobile Power Inverter

Power Extension Cords up to 100 ft.

CAT-5e Straight-thru cable up to 300 ft.

CAT-5e Crossover cables up to 25 ft.

Paper and/or digital map of the area to be surveyed.

Topography (suggested)

Topography software, support for 2D & 3D maps Topo USA x.0,

Street Map softwareMicrosoft Map Point 200x., Global Mapper Software This

is good for places Microsoft does not support .... Outside USA

Google Earth software


6/14


6

Measurement Methodology

Spectrum analysis measurements must be conducted in places where

there is enough clearance over any near field obstacles.

Measurements are typically conducted on building rooftops, tower sites,

other elevated places or using a bucket truck or boom lift truck.

The objective is to measure the maximum transmitter signal levels and

determine how much energy is present in the surveyed radio frequency

band.It is important to note that not all spectrum analysis will be performed the

same way. There are differences on how the analysis will be performed

for unlicensed or licensed bands. In the case of license bands, Alvarion

can provide specific instructions on how to measure and adjust the

spectrum analyzer to the specific band.


7/14


7

Spectrum Analyzer Configuration

Configure the frequency band for the capture:

Set the Start and Stop frequencies for the bandBe sure not to exceed span of 100 MHz for the total band.

If band allocated exceeds span of 100 MHz, then split spectrum capture

tests in two blocks of less than 100 MHz

Configure the following settings

Pre-Amplifier = ONReference Level = -40.00 dBm

Reference Level Offset = 0.0 dB

Input Attenuation = 10.0 dB

RBW = 100.0 kHz or lower

VBW = 100.0 kHz or lower

Note: Noise floor level on sc reen must be below 100 dBm

Saving each capture into a file.

Spectrum analyzer must be ready to save each measurement into digital

format that can be exported to a jpeg graphic file. When saving each

measurement file, use a naming convention that reflects the type of

capture (i.e. average, max hold, or normal) type of location, anddirection in degrees. E.g. Max-hold_SentryTower_90deg.jpeg


8/14


8

Locations for Measurements

Different types of locations can be used for the spectrum

survey measurements.One important rule of thumb is that spectrum survey locations

must be selected where there is maximum clearance over near

field obstacles and line-of-sight can be achieved to horizon.

Ground level can be used only if there is 360 degrees clearance above

any near field obstacles

Building rooftop level (at least 50 ft in height).

Bucket Truck or Boom lift (at 40 ft or higher)

In the case of a point-to-multipoint (PtMP) deployment, select

the measurement site around locations where the target service

area is more dense.

Pictures shall be taken for each spectrum capture measurement

in each direction.


9/14

ConfidentialInfo

rmation

9

Test Procedure - Preparation

Identify the location for each test by recording the GPS latitude and

longitude for each site using a GPS unit or in combination with atopography software.

Using the target service area location as reference, find a test location

that meets the location type criteria for the measurements as specified in

previous section.

Make sure the portable spectrum analyzers batteries are fully charged

or have access to a power source.

Make sure the spectrum analyzer is configured according to the settings

in the spectrum analyzer configuration section.

If your spectrum analyzer has remote control capabilities and you are

using this mode, ensure you test and verify you have full control and

capture capabilities of the unit before deploying to the remote location,such as the site tower top location.

Start the capture test and point the antenna to NORTH. Then for each

capture, rotate the antenna at certain degree intervals based on the

antenna used for the test, 60, 90 or 120 degrees.

Provide a slight up-tilt or down-tilt towards the test direction depending

on the height and position of the antenna.


10/14

ConfidentialInfo

rmation

10

Spectrum Survey Procedure - Capture

For each test, run the spectrum capture using the following

modes.1. Normal (real-time) for 30 seconds. Save the measurement.

2. Max hold for2 minutes and take the peak measurements for about 1

minute using the sampling detector. Save the measurement.

If consistent and fairly strong signals are detected during the max hold

capture, then sweep the band again for 1 minute using average mode. This

will determine if the signals present in the band are constant or periodic.

3. Average for1 minute. Save the measurement.

If the noise floor is too high, adjust the RBW and VBW to a lower

value (10 or 1 KHz) to find a better signal measurement

resolution, . Repeat steps 2 and 3, save the test..

Take a picture towards the test direction.

Rotate the antenna XX degrees interval (based on antenna type)

and perform the steps above again.


11/14

ConfidentialInfo

rmation

11

Data Collection About the site

For each site, collect the following information.

Location nameAddress

Coordinates Latitude and Longitude in decimal format.

Height actual where spectrum capture was performed.

Frequency Specify the band in MHz.

Antenna Type and gain (Sector, polarization, degrees, gain, etc.)

Antenna jumper cable length and type.

Pictures confirm pictures were taken for each direction of the test.

Line-of-sight confirm is LOS was achieved, if not specify how much

clearance was obtained.


12/14

ConfidentialInfo

rmation

12

Data Collection Capture results

For each capture test, show the following results

Frequency (MHz)

Direction azimuth (deg)

Insert capture jpeg file

Results clearly identifyand comment each capture.

Point the peak signal levels

and noise floor levels in writing.

Insert photo for each test direction

If available, insert a map of the

area to show each location.

Sample page -----)

Spectrum Analysis (xxxx xxxx MHz)

North (0 degrees)

Results

East (Degrees based on antenna type)

Results

(Enter Screen Capture of Spectrum Analysis here)

(Enter Screen Capture of Spectrum Analysis here)


13/14

ConfidentialInfo

rmation

13

Significant Observations

Include in this section any significant observations captured during thespectrum survey for each location.

Observations may include:

Any competitors equipment working in near areas.

Frequencies in use.

DirectionAny obstacles in the near or far field locations (man made or natural)

Provide characteristics (if all possible)

Any other observation may be considered valuable for the proper analysis.


14/14

ConfidentialInfo

rmation

14

Report Document - Template

Information and Results collected during the capture test will be

distributed using a Spectrum Survey Report document template.

Documents

03-2_ProfSvcs_SpectrumSurvey(JAN2008)