Communications Blockset

DBPSK Modulator Baseband

Modulate using the differential binary phase shift keying method

Library

PM, in Digital Baseband sublibrary of Modulation

Description

The DBPSK Modulator Baseband block modulates using the differential binary phase shift keying method. The output is a baseband representation of the modulated signal.

The input must be a discrete-time binary-valued signal. The input can be either a scalar or a frame-based column vector. These rules govern this modulation method when the Phase offset parameter is :

• If the first input bit is 0 or 1, respectively, then the first modulated symbol is exp(j) or -exp(j), respectively.
• If a successive input bit is 0 or 1, respectively, then the modulated symbol is the previous modulated symbol multiplied by exp(j) or -exp(j), respectively.

This block can output 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)

The phase difference between the previous and current modulated symbols when the input is zero.

Samples per symbol

The number of output samples that the block produces for each input bit.

Pair Block

DBPSK Demodulator Baseband

See Also

M-DPSK Modulator Passband, DQPSK Modulator Baseband, BPSK Modulator Baseband

DBPSK Demodulator Baseband

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