Constellation Modulator

From GNU Radio
Jump to: navigation, search

Hierarchical block for RRC-filtered differential generic modulation. The input is a byte stream (unsigned char) and the output is the complex modulated signal at baseband.

Parameters

Constellation
determines the modulation type, provide a Constellation Object here.
Samples per Symbol
samples per baud >= 2 (float)
Differential Encoding
whether to use differential encoding (boolean)
Excess BW
Root-raised cosine (RRC) filter excess bandwidth (float)
Verbose
Print information about modulator? (boolean)
Log
Log modulation data to files? (boolean)

Example Flowgraph

This flowgraph modulates random bits with 8-PSK. A QT GUI Constellation Sink is specifically not added to the output because it would show the signal while there is still multiple samples per symbol.

Constellation modulator ex.png

Constellation modulator ex2.png