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Wireless Signal Analysis

 

WiPAN LVSA - LR-WPAN Signal Analysis and Measurement Tool/Overview


The analysis of signals is a fundamental problem for many engineers and scientists. Often a large engineering effort is spent in analyzing the wireless systems. For engineers working with today’s emerging ZigBee technology, Seasolve’s signal analyzer software WiPAN LVSA is an indispensable tool for research, product development and product manufacturing. Now Perform advanced analysis of transmit and receive designs with a flexible and cost-effective analysis solution - WiPAN LVSA. It provides baseband (I/Q) analysis & RF analysis using the vector signal analyzer (NI PXI RFSA 5660).

MEASUREMENT FEATURES

Power Spectrum
Constellation
EVM
CCDF
Eye Diagram
Time Domain
RF Power Spectrum
Power In Band
Adjacent channel power (both lower and higher)
Occupied Bandwidth

The WiPAN LVSA signal analysis software is a LabVIEW design, to measure and analyze the RF and Baseband signals in the 2.4 GHz band using NI PXI RFSA 5660. It’s a WPAN Baseband PHY receiver software capable of capturing signals, performing symbol synchronization, frequency synchronization and neutralizing front end non idealities. The receiver also performs EVM calculation as per standard specifications.
 

HIGHLIGHTS

Fast and accurate analysis
Real time data display, with real time simulation of the results
Zoom function for increased detail
AutoSpan – fit to window
Custom Trigger level
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 - 2.4 GHz band ( 16 channels)
Supports Graphic Utilities like changing plot color, markers etc
Displays frame length
Analyzer provides for packet detection, offset correction, channel estimation & correction.
 

SIGNAL GENERATION SETUP FOR WPAN RECEIVER TESTING

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 5660 RFSA ver 1.5
 

BENEFITS

Evaluate Transmitter/Receiver design as per the IEEE standards
Take advantage of standardized tests to qualify parts and perform acceptance testing.
Use the software for manufacturing tests
Verification of chip designs
WPAN Equipment manufacturers can take advantage of WiPAN LVCT to ensure reliable interoperability
   between WPAN products from different vendors.
Researchers and Students can carry their research on IEEE 802.15.4(2.4 GHz) WPAN with ease and come
   out with best results
Certifying Labs can test and certify WPAN chips from various manufacturers and benchmark their
   performance
IP vendors can validate their WPAN IP for market acceptance.
Generates accurate data which helps the designers to test Receiver performance with ease
Easy to use GUI
Designers can move quickly from simulation domain to generation of real world WPAN systems
Seamless integration with NI PXI 5660 RFSA
 

Screenshots

CCDF
Using the Complementary Cumulative Distribution Function (CCDF) is the best way to look at power statistics of a signal. Figure below shows a plot of Power Level (horizontal axis) vs. Probability (vertical axis). This is known as a Complementary Cumulative Distribution Function (CCDF) plot. The CCDF plot shows dB above average power on the horizontal axis, and percent probability on vertical axis. For this one burst, the marker shows that the signal exceeds 0.24 dB above average 10% of the time. To improve the confidence interval on the low probability peaks the CCDF measurement are normally made over several bursts.
 

Constellation Diagram
IQ errors result in a loss of orthogonality between sub carriers. IQ gain imbalance causes interference between frequency mirror-image sub carriers. This shows up on constellation diagrams, as shown above. The constellation diagram example shown is based on OQPSK modulation with half sine pulse-shaping.
 

Data pattern of the WPAN signal
 

EVM
One of the most useful tools is modulation analysis. EVM is designed to measure modulation quality. It is an industry-proven measurement. EVM is simply the RMS over 1000 chips. Every chip has its own error vector. The EVM specification of 802.15.4 is 35%.
 

Eye Diagram
The eye diagram is the test of scope performance, just as it is the test of high-speed digital circuit performance. Eye Diagram reveals the modulation characteristics of the signal and analyze impacts of impairments such as pulse shaping or channel distortions. Designers use eye diagrams to evaluate the overall performance of their designs.
 

I-Q plot of the WPAN signal
 

Spectral Mask
Based on the (spectral) band power measurement in the above figure, the peak averaged signal power is about -10 dBm in this over-the-air measurement. This measurement is taken on a real DUT where the value depends on DUT and varies for different WPAN devices. The spectrum emissions test or spectral mask test specifies that the transmitted signal does not exceed a specified spectral mask. The spectral mask is relative to the maximum power spectral density in the region of the center frequency ±3.5MHz (i.e. in the occupied channel).v