哈工大阵列信号处理第一次作业

W2k=ò- wxexpjk xdx=?w(m)ejkx(m-7/2)dm=0M-1()￥()()=1/2(e-jkx7d/2+e-jkx5d/2)+(e-jkx3d/2+e-jkxd/2+ejkxd/2+ejkx3d/2)+1/2(ejkx5d/2+ejkx7d/2)=1/2[(e-jkx7d/2+ejkx7d/2)+(e-jkx5d/2+ejkx5d/2)]+[(e-jkx3d/2+ejkx3d/2)+(e-jkxd/2+ejkxd/2)]=[cos(kx7d/2)+cos(kx5d/2)]+2[cos(kx3d/2)+cos(kxd/2)]=2cos(3kxd)cos(kxd/2)+4cos(kxd)cos(kxd/2)=2cos(kxd/2)(cos3kxd+2coskxd)