Decimator. More...

Inherits unit.

Public Member Functions
function	Decimate_v1 (in param)
	Class constructor. More...

function	traverse (in obj, in in)
	Chooses a decimator, decimates, plots. 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.

Static Public Member Functions
static function	decimate (in x, in Nss_in, in Nss_out, in offset)
	Decimation by the maximum variance method. More...

static function	GardDecimate (in x, in Nss_in, in Nss_out, in offset)
	Decimation using Gardner criteria. More...

static function	NyquistGardDecimate (in x, in Nss_in, in Nss_out, in offset)
	Decimation using Nyquist/Gardner criteria. More...

static function	SLNDecimate (in x, in Nss_in, in Nss_out, in offset)
	Decimation using SLN criteria. More...

Public Attributes
Property	nInputs

Property	nOutputs

Property	Nss
	Target Nss.

Property	mode
	Decimate each signal component separately or choose same point for all? {'separate'\|'joint'}.

Property	offset
	Offset wrt. found sampling point (in samples)

Property	method
	Decimation method.

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

Decimator.

Performs decimation according to the user-specified criterion.

Example:

param.Nss      = 2;    %number of samples per symbol out
param.method = 'gardner'   %criterion
decimator = Decimate_v1(param);
param.sig.L = 10e6;
param.sig.Fs = 64e9;
param.sig.Fc = 193.1e12;
param.sig.Rs = 10e9;
param.sig.PCol = [pwr(20,{-2,'dBm'}), pwr(-inf,{-inf,'dBm'})];
Ein = rand(1000,2);
sIn = signal_interface(Ein, param.sig);
sigOut = decimator.traverse(sigIn);

Version: 3

Definition at line 31 of file Decimate_v1.m.

Constructor & Destructor Documentation

function Decimate_v1::Decimate_v1 ( in param )

Class constructor.

Constructs an object of type Decimate_v1

Parameters

param.Nss	Target number of samples per symbol out. [Default: 1]
param.offset	Number of samples to shift by [Default: 0].
param.method	Decimation criterion {'variance' \| 'gardner' \| 'SLN' \| 'gardner4nyquist'}. [Default: variance]

Return values

obj	An instance of the class Decimate_v1

Member Function Documentation

static function Decimate_v1::decimate	(	in	x,
		in	Nss_in,
		in	Nss_out,
		in	offset
	)

static

Decimation by the maximum variance method.

Parameters

x	signal to be decimated
Nss_in	Number of samples per symbol in
Nss_out	Number of samples per symbol out
offset	offset to apply

Return values

out	downsampled signal
idx	sampling point
symbols	reshaped input

static function Decimate_v1::GardDecimate	(	in	x,
		in	Nss_in,
		in	Nss_out,
		in	offset
	)

static

Decimation using Gardner criteria.

Reference: F. Gardner, "A BPSK/QPSK Timing-Error Detector for Sampled Receivers," IEEE Trans. Commun., vol. 34, no. 5, pp. 423�429, May 1986.

Parameters

x	signal to be decimated
Nss_in	Number of samples per symbol in
Nss_out	Number of samples per symbol out
offset	offset to apply

Return values

out	downsampled signal
idx	sampling point
symbols	reshaped input

static function Decimate_v1::NyquistGardDecimate	(	in	x,
		in	Nss_in,
		in	Nss_out,
		in	offset
	)

static

Decimation using Nyquist/Gardner criteria.

Parameters

x	signal to be decimated
Nss_in	Number of samples per symbol in
Nss_out	Number of samples per symbol out
offset	offset to apply

Return values

out	downsampled signal
idx	sampling point
symbols	reshaped input

static function Decimate_v1::SLNDecimate	(	in	x,
		in	Nss_in,
		in	Nss_out,
		in	offset
	)

static

Decimation using SLN criteria.

SLN = "square law nonlinearity"

Reference: M. Oerder and H. Meyr, �Digital filter and square timing recovery,� IEEE Trans. Commun. 36(5), 605�61 (1988).

Parameters

x	signal to be decimated
Nss_in	Number of samples per symbol in
Nss_out	Number of samples per symbol out
offset	offset to apply

Return values

out	downsampled signal
idx	sampling point
symbols	reshaped input

function Decimate_v1::traverse	(	in	obj,
		in	in
	)

virtual

Chooses a decimator, decimates, plots.

Parameters

in	signal to be decimated

Return values

out	downsampled signal

Reimplemented from unit.

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

library/rx/DSP/Decimate_v1.m

Public Member Functions

Static Public Member Functions

Public Attributes

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation