Demodulate DPSK-modulated data
PM, in Digital Baseband sublibrary of Modulation
The M-DPSK Demodulator Baseband block demodulates a signal that was modulated using the M-ary differential phase shift keying method. The input is a baseband representation of the modulated signal. The input and output for this block are discrete-time signals. This block accepts a scalar-valued or column vector input signal. For information about the data types each block port supports, see the Supported Data Types table on this page.
The M-ary number parameter, M, is the number
of possible output symbols that can immediately follow a given output
symbol. The block compares the current symbol to the previous symbol.
The block's first output is the initial condition of zero (or a group
of zeros, if the Output type parameter is set
Bit) because there is no previous symbol.
If you set the Output type parameter to
then the block demodulates a phase difference of
θ + 2πk/M
to k, where θ represents the Phase
rotation parameter and k represents
an integer between
0 and M-1.
When you set the Output type parameter
Bit, the block outputs binary-valued
signals that represent integers. The block represents each integer
using a group of K = log2(M)
bits, where K represents the number of bits per
symbol. The output vector length must be an integer multiple of K.
In binary output mode, the symbols can be either binary-demapped or Gray-demapped. The Constellation ordering parameter indicates how the block maps an integer to a corresponding group of K output bits. See the reference pages for the M-DPSK Modulator Baseband and M-PSK Modulator Baseband blocks for details.
The number of possible modulated symbols that can immediately follow a given symbol.
Determines whether the output consists of integers or groups of bits.
Determines how the block maps each integer to a group of output bits.
This phase difference between the current and previous modulated symbols that results in an output of zero.
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
For integer outputs, this block can output the data types
double. For bit outputs, output can be
|Port||Supported Data Types|
 Pawula, R. F., "On M-ary DPSK Transmission Over Terrestrial and Satellite Channels," IEEE Transactions on Communications, Vol. COM-32, July 1984, 752-761.