Re: DQPSK constellation

Hi Cinaed,

thanks for your reply,

GR version: v3.11.0.0git-316-gc11667ef

the GRC file is attached.

thanks

On Tue, Jan 10, 2023 at 1:49 AM Cinaed Simson <cinaed.simson@gmail.com> wrote:

Hi Ali - please state the version of gnuardio you're using and post the flowgraph used to generate your problem.

-- Cinaed

On 1/8/23 23:56, Ali G. Dezfuli wrote:

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