what does the MATLAB function 'helperMIM​OChannelEs​timate' estimates

Does the function helperMIMOChannelEstimate estimates and returns perfect channel estimate or is it using any basic channel estimation algorithm like LS OR MMMSE to calculate it.

[Umar]

Hi ANUSAYA,

The function helperMIMOChannelEstimate uses the least squares (LS) method to estimate the channel impulse response of a multiple-input multiple-output (MIMO) system.

Answer 1

[Simar]

Hi Anusaya,

The function “helperMIMOChannelEstimate” in MATLAB is designed to estimate and return the channel estimate for MIMO systems, it uses basic channel estimation algorithms such as Least Squares (LS) or Minimum Mean Square Error (MMSE) as Umar also mentioned to compute the channel estimates .

To determine the specific algorithm used by “helperMIMOChannelEstimate”, one would need to refer to the documentation or the source code of the helper function. MATLAB's helper functions, especially those prefixed with “helper”, are often provided as part of examples. However, one can usually inspect the code of these helper functions directly by opening them in the MATLAB editor.

Here is a general approach to check the function's implementation:

1. Locate the Function: Use the“which”command to find the path of the function.

which helperMIMOChannelEstimate 

2. Open the Function: Open the function file in the MATLAB editor.

edit helperMIMOChannelEstimate 

3. Inspect the Code: Look for the section of the code where the channel estimation is performed. Check if it mentions LS, MMSE, or any other estimation method.

Refer to the following example where the function is used. Often, MATLAB examples provide context and additional details about the methods and algorithms employed by the helper-

matlab:openExample('phased_comm/MIMOOFDMPrecodingExample','supportingFile','helperMIMOChannelEstimate.m') 

Please refer to the following documentation links-

• MIMO-OFDM Precoding with Phased Arrays- https://www.mathworks.com/help/phased/ug/mimo-ofdm-precoding-with-phased-arrays.html?searchHighlight=helperMIMOChannelEstimate&s_tid=srchtitle_support_results_2_helperMIMOChannelEstimate#d126e28382
• which- https://www.mathworks.com/help/matlab/ref/which.html?s_tid=doc_ta

Hope it helps!

Best Regards,

Simar

[Umar]

@Simar, Thankyou for your contribution by sharing your knowledge. That was very informative and useful information.

[ANUSAYA SWAIN]

The document does not mention anything. It only mentions "Estimate channel from the preamble signal data tones""

[Umar]

Hi @ANUSAYA SWAIN,

@Simar provided other links as well, please let us know how can we assist you further.