Algorithm 2 Recursive algorithm to calculate the received signal strength at the receiver from each element in the environment.

1:function h_func_aoa($\mathbf{h},\mathbf{tx},\mathbf{rx},\mathbf{s},{\mathbf{s}}_{\mathbf{ant}},\mathbf{P},\mathbf{d},{\mathbf{k}}_{\mathbf{i}},\mathbf{k}$) 2:      if $k==k_i$ then                                             ▹ Source is TX 3:             if $k_i==0$ then                                       ▹ Receiver is RX 4:                    Calculate $[\mathit{\omega }$, $\mathit{\gamma }$, ${\mathbf{d}}_{\mathrm{rs}}]$ from (tx, rx) with (9)–(11) 5:                    Calculate signal strength ${\mathbf{P}}_{\mathbf{rs}}$ with (8) substituting ${\mathbf{P}}_{\mathbf{s}}$ for $\mathbf{P}$ 6:                    if $\gamma$ < FoV then 7:                          ${\mathbf{h}}_{\mathbf{LOS}}={\mathbf{P}}_{\mathbf{rs}}$ 8:                    end if 9:             else                            ▹ Received signal strength at all points from TX 10:                    for $\mathbf{i}$ from $\mathbf{1}$ to $\mathbf{N}$ do 11:                         Calculate $[\mathit{\omega }$, $\mathit{\gamma }$, ${\mathbf{d}}_{\mathrm{rs}}]$ from $\left(\mathbf{tx},\mathbf{i}\right)$ with (9)–(11) substituting $\mathbf{rx}$ for the $\mathbf{i}$ element 12:                         Calculate signal strength ${\mathbf{P}}_{\mathbf{rs}}$ with (8) substituting $\mathbf{rx}$ for the $\mathbf{i}$ element and $\mathbf{Ps}$ for $\mathbf{P}$ 13:                         h_func_aoa($\mathbf{h},\mathbf{tx},\mathbf{rx},\mathbf{i},\mathbf{tx},{\mathbf{P}}_{\mathbf{rs}},\mathbf{d}+{\mathbf{d}}_{\mathbf{rs}},{\mathbf{k}}_{\mathbf{i}}-\mathbf{1},\mathbf{k}$) 14:                    end for 15:             end if 16:      else                                              ▹ Source is not TX 17:             if $k_i==0$ then                                     ▹ Receiver is RX 18:                    Calculate $[\mathit{\alpha },$${\mathbf{d}}_{\mathbf{nm}},$$\mathit{\gamma }, \mathit{\theta }, \mathit{\varphi }]$ from $({\mathbf{s}}_{\mathbf{ant}},\mathbf{s},\mathbf{rx})$ with (17)–(20), (23) substituting $\mathbf{n}=\mathbf{rx}$, $\mathbf{m}=\mathbf{s}$ and $\mathbf{l}={\mathbf{s}}_{\mathbf{ant}}$ 19:                    Calculate signal strength ${\mathbf{P}}_{\mathbf{nml}}$ with (14) substituting ${\mathbf{P}}_{\mathbf{ml}}$ for $\mathbf{P}$ 20:                    if $\alpha$ < FoV then 21:                    $\mathbf{h}\left({\mathbf{s}}_{\mathbf{i}}\right)=\mathbf{h}\left({\mathbf{s}}_{\mathbf{i}}\right)+{\mathbf{P}}_{\mathbf{nml}}$ 22:                    end if 23:             else                         ▹ Received signal strength at all points from TX 24:                    for $\mathbf{i}$ from $\mathbf{1}$ to $\mathbf{N}$ do 25:                    Calculate $[\mathit{\alpha },$${\mathbf{d}}_{\mathbf{nm}},$$\mathit{\gamma },\mathit{\theta },\mathit{\varphi }]$ from $\left({\mathbf{s}}_{\mathbf{ant}},\mathbf{s},\mathbf{i}\right)$ with (17)–(20), (23) substituting $\mathbf{n}=\mathbf{i}$, $\mathbf{m}=\mathbf{s}$ and $\mathbf{l}={\mathbf{s}}_{\mathbf{ant}}$ 26:                    Calculate signal strength ${\mathbf{P}}_{\mathbf{nml}}$ with (14) substituting ${\mathbf{P}}_{\mathbf{ml}}$ for $\mathbf{P}$ 27:                    h_func_aoa($\mathbf{h},\mathbf{tx},\mathbf{rx},\mathbf{i},\mathbf{s},{\mathbf{P}}_{\mathbf{nml}},\mathbf{d}+{\mathbf{d}}_{\mathbf{nm}},{\mathbf{k}}_{\mathbf{i}}-\mathbf{1},\mathbf{k}$) 28:                    end for 29:             end if 30:      end if 31:end function