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pskmod

Phase shift keying modulation

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Syntax

y = pskmod(x,M)
y = pskmod（x，m，ini_phase）
y = pskmod(x,M,ini_phase,symorder)

Description

y= pskmod(x,M)modulates the input signal,x, using phase shift keying (PSK) with modulation orderM.

example

y= pskmod(x,M,ini_phase)specifies the initial phase of the PSK-modulated signal.

y= pskmod(x,M,ini_phase,符号)specifies the symbol order of the PSK-modulated signal.

Examples

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打开实时脚本

Modulate and plot the constellations of QPSK and 16-PSK signals.

QPSK

Set the modulation order to 4.

M = 4;

Generate random data symbols.

data = randi（[0 M-1]，1000,1）;

Modulate the data symbols.

txsig = pskmod（数据，m，pi/m）;

Pass the signal through white noise and plot its constellation.

rxSig = awgn(txSig,20); scatterplot(rxSig)

图散点图包含一个轴对象。The axes object with title Scatter plot contains an object of type line. This object represents Channel 1.

16-psk

Change the modulation order from 4 to 16.

M = 16;

Generate random data symbols.

data = randi（[0 M-1]，1000,1）;

Modulate the data symbols.

txsig = pskmod（数据，m，pi/m）;

Pass the signal through white noise and plot its constellation.

rxSig = awgn(txSig,20); scatterplot(rxSig)

图散点图包含一个轴对象。The axes object with title Scatter plot contains an object of type line. This object represents Channel 1.

打开实时脚本

Generate random symbols.

dataIn = randi([0 3],1000,1);

QPSK modulate the data.

txSig = pskmod(dataIn,4,pi/4);

Pass the signal through an AWGN channel.

rxsig = awgn（txsig，10）;

Demodulate the received signal and compute the number of symbol errors.

dataOut = pskdemod(rxSig,4,pi/4); numErrs = symerr(dataIn,dataOut)
numerrs = 2
打开实时脚本

Plot PSK symbol mapping for Gray and natural binary encoded data.

Set the modulation order, and then create a data sequence containing a complete set of constellation points.

M = 8; data = (0:M-1); phz = 0;

Modulate and demodulate the data using Gray and natural binary encoded data.

symgray = pskmod(data,M,phz,'gray'）；mapgray = pskdemod(symgray,M,phz,'gray'）；SYMBIN = PSKMOD（数据，M，PHZ，'bin'）；mapbin = pskdemod(symbin,M,phz,'bin'）；

使用其中一个符号集绘制星座点。对于每个星座，分配一个标签，指示每个符号的灰色和自然二进制值。

  • For Gray binary symbol mapping, adjacent constellation points differ by a single binary bit and are not numerically sequential.

  • For natural binary symbol mapping, adjacent constellation points follow the natural binary encoding and are sequential.

散点图（Symgray，1,0，'B*'）；fork = 1:M text(real(symgray(k))-0.2,imag(symgray(k))+.15,...dec2base(mapgray(k),2,4)); text(real(symgray(k))-0.2,imag(symgray(k))+.3,...num2str(mapgray(k))); text(real(symbin(k))-0.2,imag(symbin(k))-.15,...dec2base(mapbin(k),2,4),'颜色'，[1 0 0]）;文本（真实（Symbin（k））-0.2，imag（symbin（k）） -  3，。...num2str(mapbin(k)),'颜色'，[1 0 0]）;endaxis([-2 2 -2 2])

图散点图包含一个轴对象。带有标题散点图的轴对象包含33个类型行的对象，文本。该对象表示通道1。

Input Arguments

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输入信号，指定为正整数的向量或矩阵。元素x必须具有[0，M- 1]。

例子：randi([0 3],100,1)

Data Types:double

调制顺序，指定为两个的整数功率。

例子：2|4|16

Data Types:double

Initial phase of the PSK modulation, specified in radians as a real scalar.

如果指定ini_phaseas empty, thenpskmoduses an initial phase of 0.

例子：pi/4

Data Types:double

符号顺序，指定为'bin'或者'gray'. This argument specifies how the function assigns binary vectors to corresponding integers.

  • If符号is'bin', the function uses a natural binary-coded ordering.

  • If符号is'gray', the function uses a Gray-coded ordering.

Data Types:char

Output Arguments

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Complex baseband representation of a PSK-modulated signal, returned as vector or matrix of complex values. The columns ofyrepresent independent channels.

See Also

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Topics

在R2006a之前引入

Communications Toolbox Documentation

金宝app

Bridging Wireless Communications Design and Testing with MATLAB

Bridging Wireless Communications Design and Testing with MATLAB

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