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mskmod

Minimum shift keying modulation

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Syntax

Y = mskmod(X,nsamp)
Y = mskmod(X,nsamp,dataenc)
Y= mskmod(X,nsamp,dataenc,initphase)
[Y,phaseout] = mskmod(___)

Description

Y = mskmod(X,nsamp) applies differentially encoded minimum shift keying (MSK) modulation to the input data, X, and returns the modulated MSK baseband signal.

Y = mskmod(X,nsamp,dataenc) specifies the data encoding method for MSK.

example

Y= mskmod(X,nsamp,dataenc,initphase) specifies the initial phase of the MSK modulator.

[Y,phaseout] = mskmod(___) returns the final phase of Y for any of the input argument combinations in the previous syntaxes.

Examples

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Open Live Script

Modulate a signal using minimum shift keying (MSK) modulation, and generate the eye diagram.

Generate a random binary signal. 

x = randi([0 1],100,1);

Apply MSK modulation to the signal.

y = mskmod(x,8,[],pi/2);

Pass the signal through an additive white Gaussian noise channel. Set the signal-to-noise ratio to 30 dB.

z = awgn(y,30,'measured');

Display the eye diagram.

eyediagram(z,16);

Figure Eye Diagram contains 2 axes objects. Axes object 1 with title Eye Diagram for In-Phase Signal, xlabel Time, ylabel Amplitude contains an object of type line. This object represents In-phase. Axes object 2 with title Eye Diagram for Quadrature Signal, xlabel Time, ylabel Amplitude contains an object of type line. This object represents Quadrature.

Input Arguments

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Input data, specified as a vector or matrix of binary values. If Y is a matrix, the function processes the columns independently.

Data Types: single | double

Number of samples per output symbol, specified as a positive integer.

Data Types: single | double

Data encoding method, specified as one of these options.

  • "diff" — Use differentially encoded MSK.

  • "nondiff" — Use nondifferentially encoded MSK.

  • [] — Use to avoid overriding the default value.

Initial phase of the MSK modulator in radians, specified as a scalar or row vector of integer multiples of pi/2. The length of initphase equals the number of channels in X.

Data Types: single | double

Output Arguments

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MSK modulated baseband signal, returned as a column vector or matrix.

Data Types: double | single
Complex Number Support: Yes

Final phase of the MSK modulated baseband signal, returned as a scalar or row vector in which each value is 0, pi/2, pi, or 3*pi/2. The output argument phaseout has the same dimensions as the input argument initphase.

Data Types: single | double

References

[1] Pasupathy, S. “Minimum Shift Keying: A Spectrally Efficient Modulation.”IEEE® Communications Magazine (July, 1979): 14–22.

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using MATLAB® Coder™.

Version History

Introduced before R2006a

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See Also

Functions

Objects

Blocks