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MT Apply Matched Filter (FSK) (G Dataflow)

Last Modified: January 9, 2017

Applies a matched filter to an input FSK-modulated waveform. The node first performs phase differentiation, followed by matched filtering on the phase of the input complex waveform. The node returns the matched filtered output with a duration equal to an integer number of symbols, thus ensuring continuability from one iteration to the next.

Use MT Align To Ideal Symbols to locate and realign the matched-filtered waveform at the ideal symbol timing instant.

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input complex waveform

The continuous-time modulated complex baseband waveform data.

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Note  

The sample rate of the input complex waveform must be an even integer multiple of the samples per symbol value. Use MT Resample (Complex Cluster) to adjust the sample rate before matched filter application.

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t0

Trigger (start) time of the Y array.

Default: 0.0

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dt

Time interval between data points in the Y array.

Default: 1.0

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Y

The complex-valued signal-only baseband modulated waveform. The real and imaginary parts of this complex data array correspond to the in-phase (I) and quadrature-phase (Q) data, respectively.

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matched filter coefficients

An ordered array containing sample-spaced coefficients for the desired matched filter. Wire the matched filter coefficients parameter of MT Generate Filter Coefficients to this parameter. Ensure that the value of samples per symbol matches the matched samples per symbol value used to generate the filter coefficients.

You can also specify custom matched filter coefficients.
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Note  

This node does not verify the absence of intersymbol interference in custom filter coefficients before applying the matched filter.

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samples per symbol

Number of samples per information symbol in the input complex waveform.

Default: 16

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error in

Error conditions that occur before this node runs. The node responds to this input according to standard error behavior.

Default: no error

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symbol phase continuity

Continuity of phase transitions between symbols.

Name Description
continuous

Continuous phase transitions between symbols.

discontinuous

Discontinuous phase transitions between symbols, that is, discontinuous phase FSK (DPFSK).

With discontinuous phase-FSK (DPFSK), modulation consists of selecting the appropriate sinusoid based on the input data. Thus, when switching between symbols, there is a discontinuity in the FSK signal phase. To emulate a hardware-based DPFSK source, this node maintains the phase of each independent sinusoid versus time. Thus, the DPFSK modulator acts like a hardware-based (multiple switched tone generator) FSK modulator.

Default: continuous

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reset?

A Boolean that determines whether the node continues matched filtering using the previous iteration states.

TRUE Resets the matched filtering process.
FALSE Continues performing matched filtering from the previous iteration. Matched filtering begins from the last iteration state on subsequent calls.

Default: TRUE

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output phase waveform

The output matched filtered continuous-time phase waveform.

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t0

Trigger (start) time of the Y array.

Default: 0

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dt

Time interval between data values in the Y array.

Default: 1.0

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Y

The complex-valued signal-only baseband modulated waveform. The real and imaginary parts of this complex data array correspond to the in-phase (I) and quadrature-phase (Q) data, respectively.

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error out

Error information. The node produces this output according to standard error behavior.

Where This Node Can Run:

Desktop OS: Windows

FPGA: Not supported


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