MT Decimate Oversampled Waveform
- Updated2023-02-17
- 4 minute(s) read
MT Decimate Oversampled Waveform
Decimates the input complex waveform and returns the decimated output complex waveform. Use this node to decimate the matched filtered waveform at the output of MT Matched Filter to recover the symbols corresponding to the ideal symbol timing location.
Inputs/Outputs
input complex waveform
The modulated complex baseband waveform data.
t0
Trigger (start) time of the Y array.
Default value: 0.0
dt
Time interval between data points in the Y array.
Default value: 1.0
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.
decimation factor
The extent to which the input complex waveform is decimated. This parameter is ignored on subsequent calls when reset? is set to FALSE.
offset
The starting index of the Y array within the input complex waveform cluster from which decimation is performed. This parameter is ignored on subsequent calls when reset? is set to FALSE. Samples prior to the specified offset are discarded. Use this parameter to specify the first sample containing an ideal symbol timing instant.
Default value: 0 (no samples discarded)
error in
Error conditions that occur before this node runs.
The node responds to this input according to standard error behavior.
Default value: No error
reset?
A Boolean that determines whether stored state information is cleared at subsequent calls to this node.
| TRUE | Decimation begins at the starting point specified by offset. |
| FALSE | The specified offset and decimation factor values are used on first call only, and computed on subsequent calls to ensure continuability from one iteration to the next. |
Default value: TRUE
output complex waveform
The decimated I/Q baseband waveform sampled at a rate 1/(decimation factor × dt) seconds/sample.
t0
Trigger (start) time of the Y array.
Default value: 0
dt
Time interval between data values in the Y array.
Default value: 1.0
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.
error out
Error information.
The node produces this output according to standard error behavior.
Advantages of Using MT Decimate Oversampled Waveform
- Does not introduce any additional phase shift (other than any specified nonzero offset)
- Does not introduce transient effects associated with filter application
- More computational efficiency and speed