Improve the system performance of the adjacent frequency coexistence system and suppress coexistence interference. From the perspective of radio frequency, which aspects should be considered? (Multiple choice)

Improve the system performance of the adjacent frequency coexistence system and suppress coexistence interference. From the perspective of radio frequency, which aspects should be considered? (Multiple choice)
A . Improve channel performance
B . Improve channel code performance
C . Improve launching performance of transmitter
D . Improve receiver reception performance

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Answer: CD