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WiLANTA
Overview |
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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.
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Key Measurements |
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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
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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.
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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.
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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.
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Import Functionality |
Import previously acquired I/Q signals
in the .txt, .bin, .mat, and .dat formats into WiLANTA via import
utility.
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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?
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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 |
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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.
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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.
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