RemoveNulledSubcarriers

class sionna.phy.ofdm.RemoveNulledSubcarriers(resource_grid: sionna.phy.ofdm.resource_grid.ResourceGrid, precision: Literal['single', 'double'] | None = None, device: str | None = None, **kwargs)

Bases: sionna.phy.block.Block

Removes nulled guard and/or DC subcarriers from a resource grid.

Parameters:

• resource_grid (sionna.phy.ofdm.resource_grid.ResourceGrid) – ResourceGrid to be used

• precision (Literal['single', 'double'] | None) – Precision used for internal calculations and outputs. If set to None, precision is used.

• device (str | None) – Device for tensor operations. If None, device is used.

Inputs:

inputs – [batch_size, num_tx, num_streams_per_tx, num_ofdm_symbols, fft_size], torch.complex. Full resource grid.

Outputs:

grid – [batch_size, num_tx, num_streams_per_tx, num_ofdm_symbols, num_effective_subcarriers], torch.complex. Resource grid without nulled subcarriers.

Examples

import torch
from sionna.phy.ofdm import ResourceGrid, RemoveNulledSubcarriers

rg = ResourceGrid(num_ofdm_symbols=14,
                  fft_size=64,
                  subcarrier_spacing=30e3,
                  num_guard_carriers=(5, 5),
                  dc_null=True)
remover = RemoveNulledSubcarriers(rg)

x = torch.randn(32, 1, 1, 14, 64, dtype=torch.complex64)
y = remover(x)
print(y.shape)
# torch.Size([32, 1, 1, 14, 53])