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WiLANTA
LVSA11bg/Overview |
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WiLANTA
LVSA11bg Signal Analyzer is an IEEE 802.11b/g (2.4 GHz)
standards specific, RF and Baseband measurement, testing and
analysis tool. LVSA11bg is used to study overall PHY layer
performance of WLAN transmitter using NI Vector Signal Analyzer.
WiLANTA LVSA11bg offers an extensive range of preprogrammed
test, analysis and measurement features. Engineers use WiLANTA
LVSA11bg to create an environment that requires less cycle time to
build a product with the desired attributes and performance,
improve manufacturing yields, and directly contribute to overall
product quality and profitability. |
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Screenshots |
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EVM
EVM will indicate how much interference or distortion is present
on the signal. (EVM)measurement gives the magnitude of vector
error between a measured constellation point and the ideal
constellation point. By measuring EVM, the linearity and
efficiency can be verified. |
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Constellation
The constellation display gives a good indication of the
"health" of the signal. When measuring the quality of the
transmitted signal, it is very useful to see a graphical
representation of the constellation. If there is significant
degradation on the signal, the constellation points will become
unclear. |
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I/Q Plot (Time Domain)
Time domain measurement is a generic measurement for viewing
waveforms in the time domain. WiLANTA captures data in the form of
Inphase and quadrature phase with RFSA. The advantage of having an
I/Q view available while in the waveform measurement is that it
allows you to view complex components of the same signal without
changing settings or measurements. |
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Power Spectral Density
One of the most important measurements in RF communications is
the spectral mask measurement. Spectral mask measurement is a test
method used to ensure that the RF signal produced by the
transmitter provides minimal interference to other systems that
are not on the same RF frequency The spectral mask generally has a
flat top representing the power level of the carrier, and outside
the band the mask shows the limits that a transmitter should not
exceed. The measurement provides information about distribution of
the transmitter's channel spectral energy due to modulation.
WiLANTA LVSA 11bg helps the users to identify excess phase noise -
the source of poor EVM by incorporating power spectral density (PSD)
feature. By just looking at the PSD plot generated by WiLANTA LVSA
11bg which is self explanatory the designer gets the clear idea of
the RF signal falling within the mask (channel limits) or not .
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WiLANTA –
LVSA11bg Measurement & Analysis Features: |
Power Spectrum
Constellation
Modulation
EVM/Subcarrier
EVM/Symbol
CCDF
Eye Diagram
Channel Response
Occupied Bandwidth
Time Domain
Spectral Flatness
Channel (AWGN/Fading/JTC)
Freq Offset Addition and/or
correction
I/Q Gain Imbalance
Phase Noise
Memoryless Nonlinearity
Quadrature Skew
DC offset
Power Amplifier Backoff
RF power spectrum
Power in band
Adjacent channel power (both
lower and higher)
The WiLANTA suite comprises of WiLANTA – Signal Generator
LVSG11bg and WiLANTA - Signal Analyzer LVSA11bg for
performing complete WLAN Receiver and Transmitter testing. Wilanta
provides the design engineer with all the basic Transmitter tests
related to RF and Baseband like Transmit power, Power spectrum, EVM
etc. prescribed by the IEEE.
The Analyzer allows the user to visualize and analyze the effect of RF
impairments like fading channels, frequency offsets , IQ mismatch etc.
on the down converted RF signal.
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Setup to
test the Transmitter performance of WLAN (802.11b/g) |
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WiLANTA –
LVSA11bg Feature highlights |
Fast and accurate analysis
Real time data display, with
real time simulation of the results
Zoom function for increased
detail
Options to load signal files
from standard file formats
Export/save signal files in
standard file formats for further analysis
Reports on erratic or
incomplete data
Friendly user interface -
spend less time on testing the device
Simpler Connectivity between
devices
Examine Symbol behavior with
eye diagrams
Error Vector Magnitude (EVM)
spectrum and time plots for sensitive examination of signal errors.
Constellation diagrams for an
overall indication of signal behavior and clues to the cause of a
problem.
Signal analysis in Time and
Frequency domains to analyze changing phase, magnitude and frequency
RF Input Frequency range is
in 2.4 GHz band
Supports Graphic Utilities
like changing plot color, markers etc
Displays various parameters
like data rate, code rate, no of symbols etc
Analyzer provides for packet
detection, offset correction, channel estimation & correction, pilot
tracking
etc.
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System
Requirements |
System Memory: Minimum 512
MB, recommended 1GB
Disk Space: 100 MB
OS: Windows 2000/NT/XP
NI-PXI 5660 RF Signal
Analyzer
Drivers : NI PXI RFSA 5660
Ver 1.5
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WiLANTA
Signal Analyzer Advantage |
Broad range capabilities to
characterize overall physical layer performance of WLAN transmitters
Easy to use GUI.
Designers can move quickly
from simulation domain to analysis of real world 802.11b/g systems
Verification of chip designs
helps WLAN manufacturers before going for production.
Real time capture of WLAN
signals for testing and certification
Seamless integration with NI
PXI 5660 RFSA
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