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MIL-188 QAM Modulator Baseband

MIL-STD-188-110 B/C standard-specific quadrature amplitude modulation (QAM)

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  • MIL-188 QAM Modulator Baseband block

Description

The MIL-188 QAM Modulator Baseband block modulates the input signal usingMIL-STD-188-110standard-specific quadrature amplitude modulation (QAM).

Ports

Input

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Input signal, specified as a scalar, vector, or matrix. The input signal must be binary values or integers in the range [0, (M– 1)], whereMis theModulation order. This port is unnamed on the block.

Note

如果处理输入gnal as binary elements, set theInput typeparameter value toBit. For binary inputs, the number of rows must be an integer multiple of log2(M). Groups of log2(M) bits in a column are mapped onto a symbol, with the first bit representing the MSB and the last bit representing the LSB.

Data Types:single|double|int8|int16|int32|uint8|uint16|uint32|Boolean

Output

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MIL-STD-188 standard-specific QAM modulated signal, returned as a complex scalar, vector, or matrix. The output signal dimensions depend on the specifiedInput typeparameter value. This port is unnamed on the block.

Input type Dimensions of Output Signal
Integer The output signal has the same dimensions as the input signal.
Bit The number of rows in the output signal equals the number of rows in the input signal divided by log2(M), whereMis theModulation order.

Parameters

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Modulation order,M, specified as16,32,64, or256. The modulation order specifies the total number of points in the constellation of the output signal.

Constellation scaling preference, specified as:

  • As specified in standard– The block scales the constellation based on specifications in the relevant standard[1].

  • Unit average power– The block scales the constellation to an average power of 1 watt referenced to 1 ohm.

Input type, specified asIntegerorBit. To useInteger, the input signal must consist of integers in the range [0, (M- 1)]。使用Bit, the input signal must contain binary values, and the number of rows must be an integer multiple of log2(M), whereMis theModulation order.

Output data type, specified asdoubleorsingle.

To plot the reference constellation, click theView Constellationbutton.

Type of simulation to run, specified as:

  • Code generation–– Simulate the model using generated C code. The first time you run a simulation, Simulink®generates C code for the block. The C code is reused for subsequent simulations as long as the model does not change. This option requires additional startup time, but the speed of the subsequent simulations is comparable toInterpreted execution.

  • Interpreted execution–– Simulate the model using the MATLAB®interpreter. This option shortens startup time and has a simulation speed comparable toCode generation. InInterpreted executionmode, you can debug the source code of the block.

Model Examples

Plot Noisy MIL-STD-188 QAM Constellation

Plot Noisy MIL-STD-188 QAM Constellation

Apply MIL-STD-188 QAM to a signal of random data. Pass the modulated signal through an AWGN channel. Plot the signal constellation.

Block Characteristics

Data Types

Boolean|double|integer|single

Multidimensional Signals

yes

Variable-Size Signals

no

More About

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References

[1] MIL-STD-188-110B & C: "Interoperability and Performance Standards for Data Modems." Department of Defense Interface Standard, USA.

Extended Capabilities

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

See Also

Blocks

Functions

Introduced in R2018b

Communications Toolbox Documentation

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