# Equalizer (G Dataflow)

Version:

Configures the equalizer.

## Session In

Session In specifies the RFmx session refnum. Session In is obtained from the RFmxInstr Initialize NIRFSA node.

## Equalizer Mode

Equalizer Mode specifies whether the measurement needs to perform equalization.

Name Value Description
Off 0

Equalization is not performed.

Train 1

The adaptive feedforward equalizer is turned ON to compensate for the effect of the channel. You can set the initial coefficients to be used by the equalizer. If you do not specify the initial coefficients, an impulse is used.

Hold 2

The filter that you specify using the initial coefficients is used as the channel filter and is applied before demodulating the acquired signal.

Default: Off

## Equalizer Filter Length

Equalizer Filter Length specifies the length of the equalization filter to be computed.

The length is specified in terms of symbols. This parameter is ignored when the equalizer initial coefficients are specified.

## Equalizer Initial Coefficients

Equalizer Initial Coefficients specifies the equalizer initial coefficients.

### x0

x0 always pass 0 to this parameter. Any other values are ignored.

### dx

dx specifies the spacing between the coefficients as a fraction of the symbol spacing. For example, if four coefficients correspond to one symbol, the spacing is 1/4.

### y

y specifies the initial coefficients to be used by the equalizer.

## Equalizer Training Count

Equalizer Training Count specifies the number of iterations during which the equalizer adapts its coefficients in the training stage.

## Selector String

Selector String comprises of the signal name. If you do not specify the signal name, the default signal instance is used.

Example:

""

"signal::sig1"

You can use the Build Signal String node to build the selector string.

Default: "" (empty string)

## Equalizer Convergence Factor

Equalizer Convergence Factor specifies the incremental step used to adapt the equalizer to the channel during the training stage.

Default: 0.0001

## error in

Error conditions that occur before this node runs.

The node responds to this input according to standard error behavior.

Standard Error Behavior

Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.

error in does not contain an error error in contains an error
If no error occurred before the node runs, the node begins execution normally.

If no error occurs while the node runs, it returns no error. If an error does occur while the node runs, it returns that error information as error out.

If an error occurred before the node runs, the node does not execute. Instead, it returns the error in value as error out.

## Session Out

Session Out passes a reference to your RFmx session to the next node.

## error out

Error information.

The node produces this output according to standard error behavior.

Standard Error Behavior

Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.

error in does not contain an error error in contains an error
If no error occurred before the node runs, the node begins execution normally.

If no error occurs while the node runs, it returns no error. If an error does occur while the node runs, it returns that error information as error out.

If an error occurred before the node runs, the node does not execute. Instead, it returns the error in value as error out.

Where This Node Can Run:

Desktop OS: Windows

FPGA: Not supported

Web Server: Not supported in VIs that run in a web application