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WLAN Signal Generator

WLAN (IEEE 802.11 abg) Signal Generation Solution

Signal sources are needed in R&D (or Production) for testing RF modules to evaluate basic WLAN Receiver functionality and when new RF designs are being evolved. Engineers now have a highly precise and flexible signal generation solution to do so.

WiLANTA LVSG11bg is a comprehensive software for generating IEEE 802.11b and IEEE 802.11g compliant signals (including their PHY+MAC layers) in the 2.4 GHz ISM (Industrial Scientific and Medical) band. WiLANTA LVSG11bg seamlessly integrates with the NI PXI RFSG 5670 to generate ideal and/or impaired IEEE 802.11b/g compliant RF signals, providing the user with complete control over the MAC frames (Management, Control and Data).

It facilitates configuration of all the MAC frame fields as mentioned in the standard along with duration ID (lets you to set the network allocation vector field and amount of time the frame occupies the channel). WiLANTA LVSG11bg generates multiple frames (i.e., frame sequences) in just one click. The sequence can be a combination of various frame types. This saves the time spent on configuring individual frame types.

The measurement set includes Power Spectral density plot, IQ Plots, Transmitter Power Plot, Constellation and Eye diagrams.

IEEE 802.11b/g signal generation solution is available in two versions

Dot WILANTA LVSG11bg- Real Time Signal Generation Solution
Dot WiLANTA IQ Generator – Creates IEEE 802.11a/b/g compliant signal files
  Know more about IQ Generator
Standards Supported
Supported frequency range
Data Rates Supported
Modulation formats Supported

Supports all the Sub Frame types mentioned in standard

Measurements

Generate multiple frames or sequence of frames in one shot

Mode of Transmission
Data configuration patterns
Impairments Supported
Configurations
Display Parameters
Extensive Graphical capabilities

Set up

IEEE 802.11b/g signal generation set up to analyze/study the receiver characteristics of 802.11b/g device

WLAN Standards Supported

WLAN standards supported 802.11b and 802.11g
Framing Burst framed data includes preamble and header fields
Modulation Formats OFDM, CCK / DSSS
Modulation Techniques DBPSK, DQPSK, BPSK, QPSK, 8-PSK, 16-QAM, 64-QAM
Data Source PRBS Sequence, User - defined, Predefined and text messages
Payload data length Maximum: 2346 bytes (CCK) and 4095 (OFDM) / Minimum: 1 byte
Encoding rates 1/2, 2/3, 3/4
Baseband filtering None, root cosine
Windowing for OFDM modes Time-domain windowing for each OFDM symbon
Scrambler On, off
Service field 0 to FFFF Hex (16 bits: First 7 LSB are masked to )
Scrambler seed initialization value OFDM: Random. All other modulation schemes as specified in respective standards.

Full control over MAC Frames

WiLANTA LVSG11bg provides the functionality to generate all IEEE 802.11b/g MAC frames mentioned in the standard. WiLANTA LVSG11bg facilitates the configuring of various frame fields such as Frame type, sub frame type, Network type, Destination address, Source address, BSSID, Duration ID (Set NAV, time occupied by frame), Fragment number, and Sequence number. The generator offers Enabling/ Disabling of WEP Encryption and retransmission of previous frames. The power management status can be set as ‘Active Mode’ or ‘Power Saving Mode’.

IEEE 802.11b/g MAC Frame Format

IEEE 802.11b/g MAC Frame and Sub Frame types supported by WiLANTA LVSG11bg

Frame Type

Sub Frame Type

Management Frame-Used to transmit management information Association request
Association response
Re association request
Re association response
Probe request
Probe response
Beacon
Announcement Rraffic Indication Message (ATIM)
Disassociation
Autheentication
De authentication
Control Frames-Used to control access to the medium Power save (PS) - Poll
RTS
CTS
Acknowledgement
Contention-Free-End
CF-End + CF Ack
Data Frames-Used for data transmission Data
Data+CF-Ack
Data+CF-Poll
Data+CF-Ack+CF-Poll
Null function (no data)
CF -Ack (no data)
CF-Poll (no data)
CF-Ack-CF-Poll (no data)

Generate impaired signals

For simulation purpose WiLANTA LVSG11bg allows modeling and viewing of various impairments. The addition of these impairments transforms WiLANTA LVSG11bg from ideal signal generation solution to Signal+noise generator solution.

Dot Memoryless Nonlinearity
Dot AWGN (Additive White Gaussian Noise)
Dot Frequency Offset
Dot DC Offset
Dot I/Q gain imbalance
Dot Quadrature skew
Dot Phase noise

Impairments Configuration

Generate multiple frames at one shot

To communicate with a device it is required to generate different kinds of frames such as RTS frames, association requests, and so on. This process is time consuming and involves delay between frames. WiLANTA LVSG11bg reduces time and delay by allowing the user to transmit multiple frames one after the other in just one click. The frame sequences can be a combination of data, management and control frames that include sub-frames.

Build Sequence of Frames – Advanced Settings

Visualize your signal with Graphical capabilities

WiLANTA LVSG11bg supports various graphical features to better visualize the signal. Change the appearance of the plot by changing the color, thickness, and style of lines. Markers (horizontal and vertical) help you to spot coordinate positions and read the signal values. WiLANTA LVSG11bg provides five different zooming options to investigate the signal in detail.

WiLANTA LVSA11abg Advantage

  • Broad range capabilities to characterize physical layer and MAC layer of IEEE 802.11 a/b/g WLAN transmitters
  • Real-time capture of IEEE 802.11 a/b/g WLAN signals
  • Collect and analyze
  • Detect and diagnose RF Problems
  • Provides various file saving and importing options
  • Analyze multiple signal files in batches
  • Flexibility to perform real-time and stored-signal analysis
  • Elegant and easy to use
  • Fast and accurate analysis
  • Designers can move quickly from the simulation domain to analysis of real world 802.11b/g systems
  • Verification of chipset designs
  • Seamless integration with NI PXI 5660 RFSA and Ascor
  • Quickly identify and debug errors
  • Use at each stage of analysis to identify signal impairments and deviations from theory