Quantizer_v1 Class Reference

Quantizer is a unit that outputs a quantized version of input signal interface. More...

Inherits unit.

Public Member Functions
function	Quantizer_v1 (in param)
	Class constructor. More...
function	traverse (in obj, in in)
	Main function call.
function	normalizeInput (in obj, in in)
	Normalize input. More...
function	quantization (in obj, in in)
	Searching maximum value of the signal. More...
function	addnoise (in obj, in in, in out)
	Quantizing the signal for values between 1 and 2^bitResolution. More...
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.

Public Attributes
Property	nOutputs
	Number of Outputs.
Property	nInputs
	Number of Inputs.
Property	bitResolution
	Resolution of DAC in bits.
Property	targetENoB
	Target Effective Number of Bits.
Property	location
	Quantizer location.
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

Quantizer is a unit that outputs a quantized version of input signal interface.

This unit implements a quantizer.

Observations

It receives complex signals and outputs complex signals. If you have a multimode (multicolumn) signal, it will quantize each column.

Example

% Here we put a FULLY WORKING example using the MINIMUM set of required parameters
quantizer = Quantizer_v1(param.quantizer);

param.sig.Fs = 64e9;
param.sig.Fc = 193.1e12;
param.sig.Rs = 10e9;
Ein = (-100000:100000);
Ein = Ein(randperm(length(Ein))) + 1j*Ein(randperm(length(Ein)));
sigIn = signal_interface(Ein, param.sig);

sigOut = quantizer.traverse(sigIn);

Advanced Example

% Here we put a FULLY WORKING example using a more extended set of parametersedit
param.quantizer.targetENoB      = 4;
param.quantizer.bitResolution   = 10;
param.quantizer.location = 'Transmitter';
quantizer = Quantizer_v1(param.quantizer);

param.sig.Fs = 64e9;
param.sig.Fc = 193.1e12;
param.sig.Rs = 10e9;
Ein = (-100000:100000);
Ein = Ein(randperm(length(Ein))) + 1j*Ein(randperm(length(Ein)));
sigIn = signal_interface(Ein, param.sig);

sigOut = quantizer.traverse(sigIn);

Output results structure

The following results are produced and stored in the structure results:

• measuredENoB Actual effective number of bits achieved by Quantizer.

References

• [1] https://en.wikipedia.org/wiki/Quantization_(signal_processing)
• [2] https://en.wikipedia.org/wiki/Effective_number_of_bits

Author

Júlio Diniz

Version

1

Definition at line 63 of file Quantizer_v1.m.

Constructor & Destructor Documentation

function Quantizer_v1::Quantizer_v1

(

in

param

)

Class constructor.

Parameters

param.bitResolution	BitResolution - is the resolution of your quantizer. [Default: 8]
param.targetENoB	TargetENoB - is the ENoB target that you want to achieve adding noise. (Optional)

Return values

obj	An instance of the class Quantizer_v1

Member Function Documentation

function Quantizer_v1::addnoise	(	in	obj,
		in	in,
		in	out
	)

Quantizing the signal for values between 1 and 2^bitResolution.

Fixing outliers Recentering the signal

function Quantizer_v1::normalizeInput	(	in	obj,
		in	in
	)

Normalize input.

Quantizing the signal Adding Noise Normalize output Requantizing Computing ENoB Results Defining Output as a signal interface

function Quantizer_v1::quantization	(	in	obj,
		in	in
	)

Searching maximum value of the signal.

Normalizing signal with maximum value

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

• library/electronics/Quantizer_v1.m