SNR_v1 Class Reference

Signal-to-noise (SNR) loading block. More...

Inherits unit.

Public Member Functions
function	SNR_v1 (in param)
	class constructor
function	addNoise (in obj, in x, in Rs, in Fawg)
	Add noise. More...
function	traverse (in obj, in sig)
	main function
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	nInputs
	Number of inputs.
Property	nOutputs
	Number of outputs.
Property	SNR
	Desired SNR (per bit) in dB.
Property	M
	Constellation order.
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

Signal-to-noise (SNR) loading block.

Adds noise based on desired SNR per bit and constellation order.

All the input power is considered signal power. If you need to set the SNR to a particular value, for now, use OSNR_v1 with appropriate parameters instead. This block is meant for easy comparison to theory.

Example:

param = struct('SNR', 20, 'M', 4);
snr = SNR_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'})];
E = rand(1000,2);

sIn = signal_interface(E, param.sig);
sOut = snr.traverse(sIn);
sOut.P.getOSNR(sOut)

This will generate a signal (in this example, of noise), then add more noise to it using snr. The optical SNR (OSNR) is then calculated using pwr::getOSNR. This is not the most effective way to convert SNR to OSNR, just an example.

See also

OSNR_v1

Author

Miguel Iglesias Olmedo

Version

1

Definition at line 36 of file SNR_v1.m.

Member Function Documentation

function SNR_v1::addNoise	(	in	obj,
		in	x,
		in	Rs,
		in	Fawg
	)

Add noise.

This function was copied from an older version of the code

Parameters

x	input signal
Rs	baud rate
Fawg	signal sampling rate

Return values

y	noisy signal

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

• library/ch/SNR_v1.m