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MIL-188 QAM Modulator Baseband

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

  • Library:
  • Communications Toolbox / Modulation / Digital Baseband Modulation

Description

The MIL-188 QAM Modulator Baseband block modulates the input signal using MIL-STD-188-110 standard-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)], where M is the Modulation order. This port is unnamed on the block.

Note

To process the input signal as binary elements, set the Input type parameter value to Bit. 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 specified Input type parameter value. This port is unnamed on the block.

Input typeDimensions of Output Signal
IntegerThe output signal has the same dimensions as the input signal.
BitThe number of rows in the output signal equals the number of rows in the input signal divided by log2(M), where M is the Modulation order.

Parameters

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Modulation order, M, specified as 16, 32, 64, or 256. 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 as Integer or Bit. To use Integer, the input signal must consist of integers in the range [0, (M – 1)]. To use Bit, the input signal must contain binary values, and the number of rows must be an integer multiple of log2(M), where M is the Modulation order.

Output data type, specified as double or single.

To plot the reference constellation, click the View Constellation button.

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 to Interpreted execution.

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

Block Characteristics

Data Types

double | single | Boolean | base integer

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™.

Introduced in R2018b