二、(10分)某模拟基带信号https://bgk-photo.cdn.bcebos.com/3c6d55fbb2fb4316453ab01a30a4462309f7d3ad.jpg的带宽是https://bgk-photo.cdn.bcebos.com/21a4462309f79052b63a8d5e1cf3d7ca7bcbd5ad.jpgkHz,对该模拟信号作SSB调制。发送端发送的已调信号功率是https://bgk-photo.cdn.bcebos.com/d833c895d143ad4b0c138ca092025aafa40f0695.jpg,接收功率比发送功率低60dB。信道中加性白高斯噪声的单边功率谱密度为https://bgk-photo.cdn.bcebos.com/83025aafa40f4bfb18ed5434134f78f0f7361895.jpgw/Hz。若要求接收机输出信噪比不低于30dB,发送功率至少应该是多少?