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WiFi Layer 1 Conformance

 

WiLANTA Overview


Topics:
Data acquisition
Key Measurements
Benefits
Baseband Analysis
Bluetooth Interference
Packet Decoder
Import Functionality
Applications
Parameter Display
Oscilloscope requirements
 

Data acquisition

WiLANTA allows real-time data (I & Q) acquisition from the DUT (Device under Test) as a single record length depending on the Oscilloscope.

It provides easy to use set-up options to select parameters like Record length, channel, and instrument interface (LAN, GPIB, etc.) to acquire real-time I/Q base band signals.

WiLANTA allows you to save raw data in a proprietary .wnt format and use it at a later stage to carry out exhaustive analysis and Transmitter tests like Transmit Power, Spectrum Mask, Constellation Error, and Error Vector Magnitude prescribed by IEEE.


 

Key Measurements

Tx Power for Acquired Signal
This measurement presents the power plot of the Acquired Signal. WiLANTA also allows you to measure the Tx Power for each packet of the acquired signal.
I/Q Plot (Time Domain)
WiLANTA captures data in the form of In phase and quadrature phase and provides the user with a single or overlaid plot of the complex 802.11 data.
Power Spectrum
Check for spectrum mask requirement and power levels specified in the standard.
CCDF (Complimentary Cumulative Distribution Function)
CCDF curve helps power amplifier designers know exactly how stressful a signal the amplifier will need to handle.
Constellation
The constellation display provides a graphic representation of the modulated signal.
Polar Plot
Get information about signal energy and phase (angle) of the symbols.
EVM
EVM/Sub Carriers
Measurement of EVM (for OFDM) plotted with Sub carriers as the X-axis, similarly visualize EVM/Chip for CCK/PBCC.

EVM/Symbols
Measurement of EVM plotted with Symbols as the X-axis.
 
Modulation Analysis
Modulation Analysis presents a combined plot of Power Spectrum, EVM/Symbols, EVM/Sub Carriers and Constellation plot. Users also have the option of selecting a particular plot from the subplots.
Eye Diagram (for 802.11b)
In the cases of 802.11b/g using CCK/PBCC modulation, Eye Diagram reveals the modulation characteristics of the signal and analyze impacts of impairments such as pulse shaping or channel distortions. Using this measurement, Wireless LAN Designers can decide on the optimum sampling point / decision for decoding the data.
Channel Response
This gives insight of the channel response and the provides user with a close look at the complexity in designing of channel estimation and correction algorithm and also helpful to analyze whether deep fades existed in the channel, which could be a possible cause of data being lost.
 
Spectral Flatness
Wireless LAN Designers can look into variations in subcarrier flatness which reduce demodulation margins and degrade link performance.
 
Packet Slideshow
With WiLANTA see a packet-by-packet slideshow of the change in parameters of each packet in the imported data.


 

Benefits

Does not require RF to test the PHY layer parameters
Support for modeling several RF/analog front end non idealities
  Power amplifier non-idealities.
  AWGN, HIPERLAN2, A, B, C, D, E, JTC with Doppler effect
  I/Q imbalance.
  Frequency offset error
Debugging is easy – Isolate analog/digital errors
Clearly identify and isolate PHY layer impairments at the design stage
Reduce time to market as the testing is easy and completely automated
Real time testing
Proper selection of RF
When used with additional equipment it can help analyze RF impairments


 

Baseband Analysis

WiLANTA allows the user to visualize and analyze the effect of simulated RF impairments like channel, frequency offset, I/Q mismatch, and Power amplifier back-off on the acquired base band signal. Designers can view the resulting changes of various measurements as a result of selecting WiLANTA configuration / analysis parameters on the fly.

Channel Model
AWGN, Fading, JTC with user defined SNR.

Frequency Offset
Visualize effects of frequency offset introduction and correction.

I/Q mismatch
Analyze the effect of amplitude mismatch and phase mismatch on the baseband signal.

Power Amplifier backoff
Determine the optimum value for power amplifier backoff for your transmitter.

Pilot Tracking
Analyze the effect of pilots on OFDM baseband signals.

Channel response
This gives insight of the channel response and provides user the complexity in designing of channel estimation and correction algorithm and also helpful to analyze whether deep fades existed in the channel, which could be a possible cause of data being lost.

DC offset
WiLANTA allows you to see the effects of DC component added to the I/Q signal.

Channel equalization
Invoke JTC channel correction for CCK/PBCC modulation and view the channel response.


 

Bluetooth Interference

Bluetooth Wireless Networks and WLAN (802.11b / 802.11g) share the same 2.4 GHz ISM band. Although, Bluetooth employs mechanisms such as Frequency Hopping to mitigate itself from interference of other users of the band, Bluetooth can cause significant interference to WLAN devices.

Hence, measuring interference caused by an interfering Bluetooth signal is a valid measure. Using this measurement, the Wireless LAN designer can understand how much of Bluetooth interference can be tolerated or how a WLAN design can be improved to mitigate Bluetooth interference.


 

Packet Decoder

WiLANTA gives number of packets in recorded import data. It also allows zeroing in on a specific packet for a more thorough analysis.


 

Import Functionality

Import previously acquired I/Q signals in the .txt, .bin, .mat, and .dat formats into WiLANTA via import utility.


 

Applications

WLAN Chip Manufacturers
Validate chip design before going to production.

WLAN Network Equipment Manufacturers
Proof of concept testing - correlate network impairment introduction with real-time test results.

IP Vendors
Validate WLAN IP for market acceptance.

Labs
Test and certify different WLAN devices from various manufacturers and benchmark their performance.
 
Who are they? How do they use it?
IC Design Houses  To get good data about the chip they design that modulates & demodulates 802.11 a/b/g OFDM signals
IP Core Developers To move quickly from simulation domain to generation and verification/analysis of real world 802.11 a/b/g systems
WLAN Chip manufacturers To verify that chips are integrated successfully into a fully functional external device such as adapter or an access point
WLAN Equipment manufacturers To ensure reliable interoperability between WLAN products from different vendors & measure performance

 

 

Parameter Display

The Parameter Window displays Data Rate, Modulation, Number of Symbols, EVM (in dB/ % rms), and Frequency Error. Wireless designers can view this data as and when the signal is acquired in real-time from the Oscilloscope or in the offline mode.


 

Oscilloscope requirements

1. Sampling rates › 250 MS/s.
2. Record lengths - Minimum 1 Mb per channel
3. TekVISA.
4. Min. of 2 channels, with simultaneous sampling.
5. Support for single mode acquisition (Recommended Scope: - Tektronix, Open Windows Scope –
    TDS5104.)
6. Differential Probes (2 numbers) with bandwidth support for the sampling rates as above.
7. Probe Accessories, for accurate probing of the DUT.