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Wireless Signal Analyzer

 

WiLANTA LVSA11bg/Overview


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.

Screenshots

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.
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.
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.
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 .
 

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.
 

Setup to test the Transmitter performance of WLAN (802.11b/g)


 

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.
 

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
 

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