DigitalPreFilter_v1 Class Reference

A prefilter for digital signals. More...

Inherits unit.

Public Member Functions
function	DigitalPreFilter_v1 (in param)
	Class constructor.
function	traverse (in obj, in in)
	Main function call.
Public Member Functions inherited from unit
function	traverseNode (in obj)
	Set unique ID when creating a unit. More...
function	connectOutput (in obj, in uobj, in unitOutput, in nextUnitInput)
	Specify where signal should go next. More...
function	connectOutputs (in obj, in units, in destInputs)
	Specify where signal should go next. More...
function	writeInputBuffer (in obj, in sig, in inputId)
	write input buffer
function	horzcat (in varargin)
	horizontal concatenation
function	vertcat (in varargin)
	vertical concatenation
function	setparams (in obj, in params, in REQUIRED_PARAMS, in QUIET_PARAMS)
	set parameters More...
function	view (in obj)
	Show interactive GUI through unit_view-class.

Static Public Member Functions
static function	filterByFFT (in io, in filter)
	User defined filter. More...

Public Attributes
Property	nOutputs
	Number of outputs.
Property	nInputs
	Number of inputs.
Property	gaussianOrder
	Order of Gaussian Pre-Filter.
Property	gaussianBandwidth
	Bandwidth of Gaussian Pre-Filter.
Property	gaussianMaxFrequency
Property	besselOrder
	Order of Bessel Pre-Filter.
Property	besselBandwidth
	Bandwidth of Bessel Pre-Filter.
Property	userDefinedFilter
	User defined filter in time domain, same sampling rate.
Public Attributes inherited from unit
Property	inputBuffer
	Buffer for storing inputs as we traverse the graph.
Property	nextNodes
	Children nodes.
Property	destInputs
	Destination inputs in children.
Property	results
	For storing results.
Property	label
Property	draw
	enable/disable plotting
Property	nInputs
	Number of signals traverse expects.
Property	nOutputs
	Number of outputs traverse expects.

Detailed Description

A prefilter for digital signals.

This function implements a prefilter in order to mitigate filtering and group delay impairments of the electrical front-end of DAC.

Observations

1. This unit implements low-pass filtering mitigation by inverse response of Gaussian low-pass filters.
2. This unit implements group delay mitigation by inverse phase response of Bessel filters.
3. This unit alse receives user defined filters in time domain.

Example

param.prefilter.gaussianOrder = 1;
param.prefilter.gaussianBandwidth = 16e9;
prefilt = DigitalPreFilter_v1(param.prefilter);

param.sig.Fs = 64e9;
param.sig.Fc = 0;
param.sig.Rs = 32e9;
Ein = upsample((randi(2,1000,1)-1.5)*2 + 1j*(randi(2,1000,1)-1.5)*2,2);
sigIn = signal_interface(Ein, param.sig);

sigOut = prefilt.traverse(sigIn);

Advanced Example

param.prefilter.gaussianOrder = 1;
param.prefilter.gaussianBandwidth = 16e9;
param.prefilter.besselOrder = 2;
param.prefilter.besselBandwidth = 84e9;
param.prefilter.userDefinedFilter = [1 0 1 ; 1 0 0]';
prefilt = DigitalPreFilter_v1(param.prefilter);

param.sig.Fs = 64e9;
param.sig.Fc = 0;
param.sig.Rs = 32e9;
Ein = upsample((randi(2,1000,1)-1.5)*2 + 1j*(randi(2,1000,1)-1.5)*2,2);
sigIn = signal_interface(Ein, param.sig);

sigOut = prefilt.traverse(sigIn);

Author

jcesardiniz

Version

1

Definition at line 58 of file DigitalPreFilter_v1.m.

Member Function Documentation

static function DigitalPreFilter_v1::filterByFFT ( in  io, in  filter  )

static

User defined filter.

Gaussian pre-filtering Bessel pre-filtering for group delay

Member Data Documentation

Property DigitalPreFilter_v1::gaussianMaxFrequency

Maximum bandwidth of Gaussian Pre-Filter (to prevent ultra-high gains and noise increasing);

Definition at line 78 of file DigitalPreFilter_v1.m.

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The documentation for this class was generated from the following file:

• library/tx/DigitalPreFilter_v1.m