Which of the following key technologies is used to improve data transmission reliability and reduce retransmission caused by data transmission errors, Thereby indirectly improving spectral efficiency?
A. F-OFDMA
B. High-order modulation
C. Channel codding
D. Massive MIMO
Answer:A
Which of the following key technologies is used to improve data transmission reliability and reduce retransmission caused by data transmission errors, Thereby indirectly improving spectral efficiency?
A. F-OFDMA B. High-order modulation C. Channel codding D. Massive MIMO