MFSK Waveform

Multiple frequency shift keying (MFSK) continuous waveform

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Libraries:
Phased Array System Toolbox / Waveforms

Description

The MFSK Waveform block generates a multiple frequency-shift keying (MFSK) continuous waveform with a specified step time, sweep bandwidth, frequency offset, and number of steps. The block outputs an integer number of samples, steps, or sweeps. For details on the structure of an MFSK waveform, see phased.MFSKWaveform.

Ports

Output

Port_1 — MFSK Waveform

complex-valued column vector

MFSK waveform, returned as a complex-valued column vector containing the waveform samples.

• If the Output signal format parameter is set to Steps, the output of the port consists of the number of steps set by the Number of frequency steps in output parameter.

• If the Output signal format parameter is set to Samples, the output of the port consists of the number of samples set by the Number of samples in output parameter.

• If the Output signal format parameter is set to Sweeps, the output of the port consists of the number of sweeps set by the Number of sweeps in output parameter.

Parameters

Sample rate (Hz) — Sample rate

151e6 (default) | positive scalar

Sample rate of the signal, specified as a positive scalar. Units are in hertz.

Sweep bandwidth (Hz) — MFSK sweep bandwidth

150e6 (default) | positive scalar

Bandwidth of the MFSK sweep, specified as a positive scalar. Units are in hertz.

Frequency step burst time (s) — Frequency step burst time

5e-6 (default) | positive scalar

Time duration of each frequency step, specified as a positive scalar. Units are in seconds.

Number of steps per sweep — Total number of frequency steps

512 (default) | even positive scalar

Total number of steps in each sweep, specified as an even positive integer.

Chirp offset frequency (Hz) — Chirp offset frequency

-294e3 (default) | real scalar

Chirp offset frequency, specified as a real scalar. Units are in hertz. The offset determines the frequency translation between the two sequences.

Output signal format — Output signal format

Steps (default) | Samples | Sweeps

Format of the output signal, specified as one of the following:

• Steps — The block outputs the number of samples contained in an integer number of frequency steps specified by the Number of frequency steps in output parameter.

• Samples — The block outputs the number of samples specified in the Number of samples in output parameter.

• Sweeps — The block outputs the number of samples contained in an integer number of sweeps specified by the Number of sweeps in output parameter.

Number of sweeps in output — Number of sweeps in output

1 (default) | positive integer

Number of sweeps in the block output, specified as a positive integer.

Dependencies

This parameter appears only when you set Output signal format to Sweeps.

Number of frequency steps in output — Number of frequency steps in output

1 (default) | positive integer

Number of steps in the block output, specified as a positive integer.

Dependencies

This parameter appears only when you set Output signal format to Steps.

Number of samples in output — Number of samples in output

100 (default) | positive integer

Number of samples in the block output, specified as a positive integer.

Example: 1000

Dependencies

To enable this parameter, set the Output signal format parameter to Samples.

Programmatic Use

Block Parameter:NumSamples

Type:double

Values:positive scalar

Default:100

Data Types: double

Simulate using — Block simulation method

Interpreted Execution (default) | Code Generation

Block simulation, specified as Interpreted Execution or Code Generation. If you want your block to use the MATLAB^® interpreter, choose Interpreted Execution. If you want your block to run as compiled code, choose Code Generation. Compiled code requires time to compile but usually runs faster.

Interpreted execution is useful when you are developing and tuning a model. The block runs the underlying System object™ in MATLAB. You can change and execute your model quickly. When you are satisfied with your results, you can then run the block using Code Generation. Long simulations run faster with generated code than in interpreted execution. You can run repeated executions without recompiling, but if you change any block parameters, then the block automatically recompiles before execution.

This table shows how the Simulate using parameter affects the overall simulation behavior.

When the Simulink^® model is in Accelerator mode, the block mode specified using Simulate using overrides the simulation mode.

Acceleration Modes

Block Simulation	Simulation Behavior
	Normal	Accelerator	Rapid Accelerator
Interpreted Execution	The block executes using the MATLAB interpreter.	The block executes using the MATLAB interpreter.	Creates a standalone executable from the model.
Code Generation	The block is compiled.	All blocks in the model are compiled.

For more information, see Choosing a Simulation Mode (Simulink).

Programmatic Use

Block Parameter:SimulateUsing

Type:enum

Values:Interpreted Execution, Code Generation

Default:Interpreted Execution

Version History

Introduced in R2015a