IQwave Online

IQwave Online Limited Edition is a simplified online version of the LitePoint IQWave WLAN Waveform Generator Software. Use IQwave Online today to generate waveforms that comply to the 802.11a/b/g/n standards. 

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User Configuration

IQwave Online generates a single data packet and modulates it at baseband according to the selected 802.11a/b/g/n modulation type. Unlike IQwave, IQwave Online does not allow the RF channel to be selected and does not model distortions or impairments. Other than that, IQwave Online provides the same capabilities as regular IQwave. The user can specify the MAC header, the payload data, the sample rate at the output of the modulator's D/A, and the data rate, and associated 802.11a/b/g/n modulation type. For 802.11a/g OFDM modulation types, the user can specify the type of windowing to be used. If "None" is selected, the first and last sample of each OFDM window are multiplied by 1/2 and added to the symbols on either side. If the "Straight Line" or "Raised Cosine" options are selected, the length of the window can be defined in terms of the number of samples at the D/A converter output. If the length is even and the window type is raised cosine, the length is incremented by 1 to be an odd number. For 802.11b/g CCK modulation types, the user can specify the type of pulse shaping filter to be used:
  • a raised cosine filter
  • a root raised cosine filter
  • A Gaussian filter
  • A rectangular pulse shaping filter in series with a Gaussian filter
For the "Raised Cosine" or "Root Raised Cosine" filter options, the length and the roll-off (excess bandwidth) can be specified. Note that the length is normalized by the 11 MHz symbol duration, i.e., an input of 2 specifies a filter length of 2/11 msec. For the "Gaussian" or "Gaussian & Rect" filter options, the length and BT product can be specified. Both values are normalized by the 11 MHz symbol duration and apply to the Gaussian filter. For the "Gaussian & Rect" pulse shaping filter option, the Gaussian-filtered pulse is convolved with a rectangular pulse with a duration of 1/11 msec.

The combinations of filter length and roll-off or BT values that meet the 802.11b/g spectral mask are shown below:

 Filter Type

Filter Length 

Roll-Over BT Valve 

 Raised Cosine

3 

 1

 Root Raised Cosine

4 

 1

 Gaussian

 4

 0.3

 Gaussian & Rect

 2

 0.5

Output

Once the desired waveform has been configured, click "Generate Samples" at the upper right of the IQwave Online panel to obtain the results. On the right pane of IQview Online, four graphs will be displayed, three in the time domain and one in the frequency domain. In the time domain, the signal amplitude (complex magnitude) is displayed in dB and the real and imaginary (I and Q) amplitudes are shown. Note that I and Q amplitude levels have been scaled so that the rms signal amplitude (complex magnitude) is equal to 1 (0 dB), assuming a signal is present. In the frequency domain, the power spectral density of the waveform is shown.

If desired, the user can download a .mod file of the generated waveform for use with Matlab. This file contains the time domain waveform as a complex array.