Communications Blockset

DBPSK Demodulator Baseband

Demodulate DBPSK-modulated data

Library

PM, in Digital Baseband sublibrary of Modulation

Description

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 and +, respectively, to outputs of 0 and 1, respectively, where is the Phase offset 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.

The input can be either a scalar or a frame-based column vector.

Processing an Upsampled Modulated Signal

The input signal can be an upsampled version of the modulated signal. The Samples per symbol parameter is the upsampling factor. It must be a positive integer. For more information, see Upsampled Signals and Rate Changes in Using the Communications Blockset.

Dialog Box

Phase offset (rad)

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

Samples per symbol

The number of input samples that represent each modulated symbol.

Pair Block

DBPSK Modulator Baseband

See Also

M-DPSK Demodulator Baseband, DQPSK Demodulator Baseband, BPSK Demodulator Baseband

Data Mapper

DBPSK Modulator Baseband