smart antenna research
DESCRIPTION
Smart Antenna ResearchTRANSCRIPT
7/17/2019 Smart Antenna Research
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Smart Antenna Research Under
the GloMo Program
Smart Antenna Research Under
the GloMo Program
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The ProblemThe Problem
BaseStation
Uplink
Multipath
Uplink
Mobile
Downlink Multipath
Intercell
Interference
Signal Fading
Limitations on Capacity
•Co-channel interference
•Multiple access interference
•Adjacent channel interference
•Multipath, fading, and noise
Apparent Solution
DSP Interference Rejection Techniques
Reality of the Solution
•High power consumption
•Excessive computing needed
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Research AreasResearch Areas
l Adaptive Antenna and Direction
Finding Algorithms and Hardwarel Hand-Held Smart Antennas
l Vector Channel Modeling
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Adaptive Antenna and
Direction FindingAlgorithms and Hardware
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Code Timing
Spatial Filters
Despreaders
Demodulator
and
Beamforming
Algorithm
Front End for Antenna 1ADC / DDC
(SigTek ST-114)BPF
IF
AMP
Local Oscillator
X IF LPF
~f=1982 MHZ
f=2050 MHZ
Front End for Antenna 8ADC / DDC
(SigTek ST-114)BPF
IF
AMP
Local Oscillator
X IF LPF
~f=1982 MHZ
f=2050 MHZ
ApplicationsDemonstrateinterference
rejection through
spatial filtering
Study algorithm
performance
Perform AoA estimation forposition location applications
Developing spatialchannel models
Third Generation Array
DSPTI C549/C541
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Multi-Target CMAMulti-Target CMA
CMA
+
CMA
+RF Front End
&
Baseband conversion
RF Front End
&Baseband conversion
RF Front End
&
Baseband conversion
Gram-Schmidt
Orthogonalizer
User 1 output
User M output
1
2
M
Port # 1
Port # M
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Accomplishments
l Smart Antennas at the HandsetÕCreated and built 2 measurement systems to measure
propagation characteristics as seen by the handset
ÕInitial data collection shows an improvement of up to
17 dB in the link budget with adaptive combining and
7dB with diversity combining
Antenna Unit
VectorChannelMeasurementSystem
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MPRG Vector Measurement SystemMPRG Vector Measurement System
l
Fully functional 8 elements,1.25 MHz Bandwidth, 2.050GHz center frequency
l Flexible for adapting variousantenna/polarization inputs,carrier frequencies,bandwidths, real-time
algorithms, or data collectionscenarios
l Eight Harris 40214Programmable Direct DigitalDownconverters, eight C54xDSPs, one Analog Devices
21010
l New features being addedÕ CDMA capabilityÕ Improved systemexecutive processing
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Research IssuesResearch Issues
l Adaptive array algorithm performance
in real situations
l Vector channel measurementsl Practical AOA algorithm and
hardware development
l Adaptive array algorithm convergenceissues
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Future Work - Summer 98 ResearchFuture Work - Summer 98 Research
MPRG's vector
measurement system will
be located at a point along
the Smart Road and will
estimate the angle at whichthe signal arrives at the
array. This angle defines
the line of bearing.
Channel measurements will
also be made to quantify
the impact of the channel
on measurement accuracy.