Channel frequency response in Line-Of-Sight path

[Moshe313]

Hi,
I'm using sionna.rt for a beamforming project in MIMO system.
I generate channel frequency response using "scene" in empty room ("load_scene()") and add there single transmitter and single receiver.
with the code lines:

paths = scene.compute_paths(max_depth=1, method="exhaustive", num_samples=1e6)
H = paths.a[0, 0, :, 0, :, 0, 0].numpy()

H is Nr X Nt matrix that represent the LOS path.
paths.types.numpy() gives [[0]].

For my algorithm I normalize H by H[0,0] so that will be a product of 2 unnormalized steering vectors as in the following function:

def steering_vector(theta, Nr, d=0.5):
    return np.exp(-2j * np.pi * d * np.arange(Nr) * np.sin(theta))

Since the first element of both vectors is 1, we can find them in the first row and column of H. The first column of H is indeed the steering vector of the angle of arrival at the receiver (paths.phi_r) but the first row does not correspond to pi-aoa (paths.phi_t) which is the departure angle I would expect to be in LOS path.
I will note that at the moment the simulation is in 2D, the real angles I estimate is from paths.phi_r and paths.phi_t.

Did I make a mistake in creating H for the LOS path? Is there a way for me to know what this angle represents?

Thank you!