DBPSK Demodulator Baseband

Demodulate DBPSK-modulated data


PM, in Digital Baseband sublibrary of Modulation


The DBPSK Demodulator Baseband block demodulates a signal that was modulated using the differential binary phase shift keying method. The input is a baseband representation of the modulated signal.

The input must be a discrete-time complex signal. The block compares the current symbol to the previous symbol. It maps phase differences of θ and π+θ, respectively, to outputs of 0 and 1, respectively, where θ is the Phase rotation parameter. The first element of the block's output is the initial condition of zero because there is no previous symbol with which to compare the first symbol.

This block accepts a scalar or column vector input signal. The input signal can be of data types single and double. For information about the data types each block port supports, see Supported Data Types.

Dialog Box

Phase rotation (rad)

This phase difference between the current and previous modulated symbols results in an output of zero.

Output data type

When the parameter is set to 'Inherit via internal rule' (default setting), the block will inherit the output data type from the input port. The output data type will be the same as the input data type if the input is of type single or double.

For additional information, see Supported Data Types.

Supported Data Types

PortSupported Data Types


  • Double-precision floating point

  • Single-precision floating point


  • Double-precision floating point

  • Single-precision floating point

  • Boolean

  • 8-, 16-, and 32-bit signed integers

  • 8-, 16-, and 32-bit unsigned integers

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