●●● ●●●● ●●●●心 ●●●● ●●●●0 Comparing with transmitting baseband signal ●●●● ●●●● ●● directly,to transmit data by modulating a higher frequency carrier wave has the effect on: .1controlling the radiated frequency spectrum. 控制辐射频谱 2more efficient use of the allocated RF bandwidth. 更有效利用射频带宽 3flexibility in accommodating different baseband signal formats.便于采用不同的基带信号格式 7Comparing with transmitting baseband signal directly, to transmit data by modulating a higher frequency carrier wave has the effect on:  ①controlling the radiated frequency spectrum. 控制辐射频谱  ②more efficient use of the allocated RF bandwidth. 更有效利用射频带宽  ③flexibility in accommodating different baseband signal formats.便于采用不同的基带信号格式 7