leon_zhou
Newbie level 1
I am a student and i have some problem for echo cancellation using PN codes .
The picture is my GSM echo cancellation Block diagram，if sending pn codes from A after DDC， and receiving its echo signal from antenna ， the baseband signal of
echo signal will change because of time delay，and i deside to use costas loop to capture phase shift，but signal from base station also in the receive antenna，
so there is impossible to recovery echo signal carrier，and impossible to cancel echo signal using LMS in base band. How can i do? please help!!
The picture is my GSM echo cancellation Block diagram，if sending pn codes from A after DDC， and receiving its echo signal from antenna ， the baseband signal of
echo signal will change because of time delay，and i deside to use costas loop to capture phase shift，but signal from base station also in the receive antenna，
so there is impossible to recovery echo signal carrier，and impossible to cancel echo signal using LMS in base band. How can i do? please help!!
