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DQPSK constellation


From: Ali G. Dezfuli
Subject: DQPSK constellation
Date: Mon, 9 Jan 2023 11:26:31 +0330

Hi all,
I've managed to get to the same signal of the block "Constellation Modulator" by using these blocks in concatenation:

{  --> repack bits --> differential encoder --> constellation encoder (or: chunks to symbols) --> polyphase arbitrary resampler --> }

and tried them for bpak, qpsk, 8psk, and 16qam, and all OK.

This command digital.constellation_dqpsk().points() gets the following points:

[(1.4142135381698608+1.4142135381698608j), (-1.4142135381698608+1.4142135381698608j), (-1.4142135381698608-1.4142135381698608j), (1.4142135381698608-1.4142135381698608j)]

which is different from the documentation of DQPSK which says:
01 | 00
-------
11 | 10
I wonder how I can get the same result for DQPSK by using the above series of blocks.

thanks






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