SciLib.SP.Comm
Class Encode

java.lang.Object
  SciLib.SP.Comm.Encode

public final class Encode
extends java.lang.Object

This class contains some methods to perform the encoding techniques.

Constructor Summary

Encode()

Method Summary

static void	AM(double na, double fc) Plot the result of modulating by Amplitude-Modulation technique.
static vector	AM(double na, double fc, vector x, vector t, boolean plot) Generate the modulating signal by Amplitude-Modulation technique.
static bitStream	AMIData(int[] signal) Recover digital data from bipolarAMI signal.
static vector	ASK(bitStream bits, boolean plot) Plot the result of modulating by Amplitude-shift keying technique.
static int[]	bipolarAMI(bitStream bitstr, boolean plot) Generate a signal from a bitStream data using bipolarAMI technique.
static int[]	differentialManchester(bitStream bitstr, boolean plot) Generate a signal from a bitStream data using differentialManchester technique.
static bitStream	differentialManchesterData(int[] signal) Recover digital data from differentialManchester signal.
static bitStream	directSeq(bitStream in, bitStream bseq) Generate a direct sequence signal.
static vector	FSK(bitStream bits, boolean plot) Plot the result of modulating by Frequency-shift keying technique.
static bitStream	inverseDirectSeq(bitStream s, bitStream bseq) Recover data from a direct sequence signal.
static int[]	Manchester(bitStream bitstr, boolean plot) Generate a signal from a bitStream data using Manchester technique.
static bitStream	ManchesterData(int[] signal) Recover digital data from Manchester signal.
static int[]	NRZI(bitStream bitstr, boolean plot) Generate a signal from a bitStream data using NRZI technique.
static bitStream	NRZIData(int[] signal) Recover digital data from NRZI signal.
static int[]	NRZL(bitStream bitstr, boolean plot) Generate a signal from a bitStream data using NRZL technique.
static bitStream	NRZLData(int[] signal) Recover digital data from NRZL signal.
static void	PM(double Ac, double np, double fc) Plot the result of modulating by Phase-Modulation technique.
static vector	PM(double Ac, double np, double fc, vector x, vector t, boolean plot) Genarate the modulating signal by Phase-Modulation technique.
static int[]	pseudoternary(bitStream bitstr, boolean plot) Generate a signal from a bitStream data using pseudoternary technique.
static bitStream	pseudoternaryData(int[] signal) Recover digital data from pseudoternary signal.
static vector	PSK(bitStream bits, boolean plot) Plot the result of modulating by Phase-shift keying technique.
static vector	QPSK(bitStream bits, boolean plot) Plot the result of modulating by Quadrature Phase-shift keying technique.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Encode

public Encode()

Method Detail

NRZL

public static int[] NRZL(bitStream bitstr,
                         boolean plot)

Generate a signal from a bitStream data using NRZL technique.

Parameters:

bitstr - A bitStream

plot - An option, true for to plot the signal

Returns:

An integer array that contains the signal voltage levels

NRZLData

public static bitStream NRZLData(int[] signal)

Recover digital data from NRZL signal.

Parameters:

signal - An integer array that contains NRZI pulses

Returns:

A bitStream that represents digital data

NRZI

public static int[] NRZI(bitStream bitstr,
                         boolean plot)

Generate a signal from a bitStream data using NRZI technique.

Parameters:

bitstr - A bitStream

plot - An option, true for to plot the signal

Returns:

An integer array that contains the signal voltage levels

NRZIData

public static bitStream NRZIData(int[] signal)

Recover digital data from NRZI signal.

Parameters:

signal - An integer array that contains NRZI pulses

Returns:

A bitStream that represents digital data

bipolarAMI

public static int[] bipolarAMI(bitStream bitstr,
                               boolean plot)

Generate a signal from a bitStream data using bipolarAMI technique.

Parameters:

bitstr - A bitStream

plot - An option, true for to plot the signal

Returns:

An integer array that contains the signal voltage levels

AMIData

public static bitStream AMIData(int[] signal)

Recover digital data from bipolarAMI signal.

Parameters:

signal - An integer array that contains AMI pulses

Returns:

A bitStream that represents digital data

pseudoternary

public static int[] pseudoternary(bitStream bitstr,
                                  boolean plot)

Generate a signal from a bitStream data using pseudoternary technique.

Parameters:

bitstr - A bitStream

plot - An option, true for to plot the signal

Returns:

An integer array that contains the signal voltage levels

pseudoternaryData

public static bitStream pseudoternaryData(int[] signal)

Recover digital data from pseudoternary signal.

Parameters:

signal - An integer array that contains pseudoternary pulses

Returns:

A bitStream that represents digital data

Manchester

public static int[] Manchester(bitStream bitstr,
                               boolean plot)

Generate a signal from a bitStream data using Manchester technique.

Parameters:

bitstr - A bitStream

plot - An option, true for to plot the signal

Returns:

An integer array that contains the signal voltage levels

ManchesterData

public static bitStream ManchesterData(int[] signal)

Recover digital data from Manchester signal.

Parameters:

signal - An integer array that contains Manchester pulses

Returns:

A bitStream that represents digital data

differentialManchester

public static int[] differentialManchester(bitStream bitstr,
                                           boolean plot)

Generate a signal from a bitStream data using differentialManchester technique.

Parameters:

bitstr - A bitStream

plot - An option, true for to plot the signal

Returns:

An integer array that contains the signal voltage levels

differentialManchesterData

public static bitStream differentialManchesterData(int[] signal)

Recover digital data from differentialManchester signal.

Parameters:

signal - An integer array that contains pseudoternary pulses

Returns:

A bitStream that represents digital data

ASK

public static vector ASK(bitStream bits,
                         boolean plot)

Plot the result of modulating by Amplitude-shift keying technique.

Parameters:

bits - A bitStream

plot - An option, true for to plot the signal

FSK

public static vector FSK(bitStream bits,
                         boolean plot)

Plot the result of modulating by Frequency-shift keying technique.

Parameters:

plot - An option, true for to plot the signal

bits - A bitStream

PSK

public static vector PSK(bitStream bits,
                         boolean plot)

Plot the result of modulating by Phase-shift keying technique.

Parameters:

plot - An option, true for to plot the signal

bits - A bitStream

QPSK

public static vector QPSK(bitStream bits,
                          boolean plot)

Plot the result of modulating by Quadrature Phase-shift keying technique.

Parameters:

bits - A bitStream

plot - An option, true for to plot the signal

AM

public static void AM(double na,
                      double fc)

Plot the result of modulating by Amplitude-Modulation technique.

Parameters:

na - Modulation index

fc - Frequency of the carrier

AM

public static vector AM(double na,
                        double fc,
                        vector x,
                        vector t,
                        boolean plot)

Generate the modulating signal by Amplitude-Modulation technique.

Parameters:

na - Modulation index

fc - Frequency of the carrier

x - A vector that was normalized to unity amplitude

t - The time vector that has the same length as x

plot - An option, true for to plot the signal

PM

public static void PM(double Ac,
                      double np,
                      double fc)

Plot the result of modulating by Phase-Modulation technique.

Parameters:

Ac - The carrier amplitude

np - Phase Modulation index

fc - Frequency of the carrier

PM

public static vector PM(double Ac,
                        double np,
                        double fc,
                        vector x,
                        vector t,
                        boolean plot)

Genarate the modulating signal by Phase-Modulation technique.

Parameters:

Ac - The carrier amplitude

np - Phase Modulation index

fc - Frequency of the carrier

x - A vector that was normalized to unity amplitude

t - The time vector that has the same length as x

plot - An option, true for to plot the signal

Returns:

A vector

directSeq

public static bitStream directSeq(bitStream in,
                                  bitStream bseq)

Generate a direct sequence signal.

Parameters:

in - A bitStream, input data

bseq - A bitStream, binary pattern

Returns:

an output bitStream

inverseDirectSeq

public static bitStream inverseDirectSeq(bitStream s,
                                         bitStream bseq)

Recover data from a direct sequence signal.

Parameters:

s - A bitStream, the direct sequence signal

bseq - A bitStream, binary pattern

Returns:

an output bitStream, the original data