Hi,
On 05/23/2017 02:45 AM, Tellrell White wrote:
Hi All,
I'm currently using the the IEEE 802.15.4 testbed developed by Bastian
Bloessl, and company, specifically the offset-qpsk PHY. The only changes
I've made to the flow-graph developed by Bastian is adding a vector
source consisting of 0's and 1's as my input source and adding a
constellation sink. I've attached the flow-graph for reference. When
running the flow-graph, the output of the constellation doesn't look
quite correct. For instance I'm not quite sure why there are
constellation points at 0 + j and 0 - j as well as at 1 + 0j and 1- 0j.
A picture of the constellation plot is also attached.
I'm not sure what you are irritated about. With OQPSK you don't change
abruptly, but transition from one constellation point to the other on a
circle. Depending on the sample rate, there are multiple points
in-between the final constellation at +-0.707 +- 0.707i. (in that case
it is just one).
Best,
Bastian
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