Is it possible to set channel type to gaussian?

2 次查看（过去 30 天）
PAU TAÑA VIÑETA
PAU TAÑA VIÑETA 2021-3-15
评论： Arthi Sathyamurthi 2021-3-24
Hi, I was wondering if there is an option to change the channel type from Rayleigh to Gaussian in LTE Toolbox.
I am simulating downlink channels and I would like to simulate first a channel with just AWGN.
I have seen ModelType can be GMEDS or Dent, both Rayleigh.
channel.ModelType = 'GMEDS'; % Rayleigh fading model type
How can I make the channel type to be Gaussian?
Thank You.

请先登录，再回答此问题。

回答（1 个）

Arthi Sathyamurthi
Arthi Sathyamurthi 2021-3-23
As of now the available options for channel type in the channel model configuration are the Rayleigh fading model types such as ‘GMEDS’ and ‘Dent’. You can still switch off fading completely and implement a static MIMO channel model by setting the ‘DelayProfile’ input argument as ‘Off’. Here the matrix containing the link between each transmit and receive antennas will have zero delay and unit gain.
For more information you can refer to the input arguments subsection of the lteFadingChannel documentation page.
  2 个评论
PAU TAÑA VIÑETA
PAU TAÑA VIÑETA 2021-3-23
编辑：PAU TAÑA VIÑETA 2021-3-23
Hi! thank you for your answer.
The thing is this way does not mean the channel model is Gaussian either - I suppose.
I tried setting rxWaveform = txWaveform, and then rxWaveform = rxWave form + noise, so no fadding channel is applied, just AWGN, but now I get BLER = 1 for all SNR points. Maybe it is because of some normalitzation, I don't know.
So, I assume there is no way to simulate Gaussian model, isn't it?
Thank you again.
P.
% Pass data through channel model
channel.SamplingRate = ofdmInfo.SamplingRate;
[rxWaveform,fadingInfo] = lteFadingChannel(channel, txWaveform);
rxWaveform=txWaveform; % <-------
% Calculate noise gain including compensation for downlink power
% allocation
SNR = 10^(SNRdB(snrIdx)/20);
% Normalize noise power to take account of sampling rate, which
% is a function of the IFFT size used in OFDM modulation, and
% the number of antennas
N0 = 1/(sqrt(2.0*enb.NBRefP*double(ofdmInfo.Nfft))*SNR);
% Create additive white Gaussian noise
noise = N0*complex(randn(size(rxWaveform)), ...
randn(size(rxWaveform)));
% Add AWGN to the received time domain waveform
rxWaveform = rxWaveform + noise;
Arthi Sathyamurthi
Arthi Sathyamurthi 2021-3-24
Hi Pau, since I don’t know the receiver blocks of your program the possible workaround/solution is to try checking your equations on normalizing noise power. In case you feel the equation is right, check if the AWGN noise generated is right (try plotting the PDF). Also one another workaround could be increasing the range of SNR.

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Propagation and Channel Models 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by