Channel Model without OFDM waveform

[aritra-2506]

I want to use channel models like TDL, CDL or UMi without using the OFDM waveform (resource grid). Is this possible in SIONNA? I do not see an option.

[jhoydis]

Hi,

There are various ways in which you can use these channel models.

1. You can create an instance of the channel model, e.g., UMi, and generate batches of impulse responses, i.e., path delays and complex gains. Then you are free to do with this whatever you want.
2. You can create a discrete frequency-domain representation of the channel impulse response generated in step 1. by applying the cir_to_ofdm_channel function.
3. You can create a discrete complex-baseband time-domain representation of the channel impulse response generated in step 1. by applying the cir_to_time_channel function.

The functions ApplyTimeChannel and ApplyOFDMChannel can be used to compute channel outputs for a provided input signal using the results from step 2. or step 3.

None of these functions rely on a resource grid and you can use them in any way you want. You could also use them for single-carrier modulations, e.g., by using some filters from the signal module.

Hope that helps.

[aritra-2506]

Thanks a lot Mr. Hoydis. It will surely help.