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Confiden t ial ProprietaryDoCoMo/Motoro la Meeting Ju ne 8 & 9, 2000
Microwave Propagation
CharacteristicsIn The MMDS Frequency Band
Jeffrey W. Porter and John A. Thweatt
Motorola Labs Communication Systems and Technologies
To be presented at the International Conference on Communications (ICC2000), June 18-22, 2000.
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Outline of Presentation
Introduction
Measurement Methods
Path Loss Results
Delay Spread Results
Conclusions
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Introduction
Study Objectives To determine path loss characteristics
To determine delay spread characteristics
System Parameters
Frequency Band - MMDS - 2.45 - 2.50 GHz
Transmitter:
43 meters high
53 sectored antenna, 11 dBi gain
Receiver:
5.2 - 16.5 meters 10 beamwidth directional antenna, ~21 dBi gain
Omni-directional antenna, 9 dBi gain
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Propagation Measurement System
Transmitter Site
IL02 Sector HQ, East
Penthouse
30 foot tower with rotator
Equipment cabinet
cabling, equipment rack,
workstation
propagationtestsignal
controllink
Test Truck with Mast
Transmitter
Equipment
Cabinet
Wireless control channel
Receiver Site
Motorola Labs Field Test
Vehicle Pneumatic mast, pan & tilt
Antenna assembly and camera
Workstation
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Measurement Campaign
Data collected at sites inSchaumburg, Hoffman
Estates, Palatine, etc.
Sites chosen for
representative coverage
Controlled by operator inthe test truck
Automated process with
LabView application
Measurement Data
1458 power measurements at 243 sites
58,300 power delay profiles recorded at 104 sites
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Path Loss Measurements
Transmit an unmodulated carrier at 2.496 GHz
using a vertical-polarized directional antenna
Receiver used a Spectrum Analyzer to determine
average power for 10 seconds
for vertical-polarized directional and omni-directional
antennas
at three antenna heights - 16.5 m, 10.4 m, 5.2 m (54,34, 17 feet)
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* Varying the Antenna Height does not significantly affect path loss
LOS Path Loss - Directional Receive Antenna
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* Varying the Antenna Height does not significantly affect path loss
LOS Path Loss - Omni-directional Antenna
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NLOS Path Loss - Directional Antenna
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NLOS Path Loss - Omni-directional Antenna
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Summary of Path Loss Results
n = Path Loss Exponent
s= Standard deviation of n
N = Number of samples
Receive Antenna Height
16.5 meters 10.4 meters 5.2 meters
Visibility Receive Antenna
Type
n s N n s N n s N
LOS Directional 2.4 3.8 107 2.9 4.7 70 1.7 3.1 28
Omni-directional 2.4 3.4 90 2.6 4.6 66 2.1 3.5 27
NLOS Directional 2.1 10.5 132 2.9 11.4 143 4.1 12.6 168
Omni-directional 2.7 9.4 122 3.3 10.1 134 4.2 10.5 163
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Objective: To measure the RMS Delay Spread and
determine the effects of LOS/NLOS conditions
determine the effects of antenna directivity
determine the effects of antenna height
Delay Spread Measurement System
SigTek 515 Channel Sounder
Parameters
20 Mcps Direct sequence spread spectrum (DS-SS)
Frequency at 2.475 GHz
Multipath Resolution of ~50 ns
30 dB processing gain
Delay Spread Measurements
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Delay Spread for LOS and NLOS Conditions
50
60
70
80
90
100
0.0 1.0 2.0 3.0 4.0 5.0
RMS Delay Spread for LOS
RMS Delay Spread (s)
Directional
Omni-directional
%P
ro
babilityofRMSDelaySpr
ead