I am reading a book called Massive MIMO Networks: Spectral, Energy, and Hardware Efficiency, and it implies that $$\frac{\mathbf{h}}{\sqrt{\text{E}\left\{\|\mathbf{h}\|^2\right\}}}$$ is the channel direction, where $\mathbf{h}\in \mathbb{C}^{M}$, where $M$ is a positive integer (see the picture for the snapshot). I don't understand what it means, and how. Could any explain this to me. Thanks in advance
EDIT: It I originally defined the direction as $$\frac{\|\mathbf{h}\|^2}{\sqrt{\text{E}\left\{\|\mathbf{h}\|^2\right\}}}$$ but it should be $$\frac{\mathbf{h}}{\sqrt{\text{E}\left\{\|\mathbf{h}\|^2\right\}}}$$