dear sir, i have questions about the RIS scenario : First the RIS elements all passive or we can change to semi-passive . second i want to know how you calculate the phase shift matrix (its random)and beamforming … give me more details about these matrix and how to make it as output like the channel matrix. third, i want to know about the channel matrix in real and imaginary values when i represent the channel matrix as 2D image time-frequency response (how the values calculated , what is it , and the range of these values in channel matrix represented ).
Dear Walaa,
First the RIS elements all passive or we can change to semi-passive . second i want to know how you calculate the phase shift matrix (its random)and beamforming
The function generateTransmitSignal in the class IntermediateNode determines the functionality of the RIS. The current implementation supports passive RIS elements with random phase shifts. You can adapt the generateTransmitSignal function to support the desired functionality.
second i want to know how you calculate the phase shift matrix (its random)and beamforming … give me more details about these matrix and how to make it as output like the channel matrix.
The updateSpatialProcessing function in the BaseStation class is responsible for updating the phases for the RIS. Currently, only random phase shifts are supported.
third, i want to know about the channel matrix in real and imaginary values when i represent the channel matrix as 2D image time-frequency response (how the values calculated , what is it , and the range of these values in channel matrix represented ).
The getTheTotalChannel function in the Link class calculates the channel from the BS to the UE, including the RIS. The channel can be accessed via this function.
The channel matrix depends on the channel model selected in the scenario. If you are interested in how the channel is generated, please have a look at the FastFading class.
Best,
Mariam