How do i create lots of gaussian channel?

Question

yang-En Hsiao 2019-2-9

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评论： Rik 2019-2-18

How to build K gaussian channel code in matlab ? i mean if $h_1,h_2,...,h_K$ are all gaussian channel,how do i write this code in just one or two line code?I know how to write the code if there is just one gaussian channel

`h=sqrt(1/2)*(randn(1,size(x))+1i*randn(1,size(x)));`

But i think it is stupid to write as

h_1=sqrt(1/2)*(randn(1,size(x))+1i*randn(1,size(x)))

h_2=sqrt(1/2)*(randn(1,size(x))+1i*randn(1,size(x)))...

h_K=sqrt(1/2)*(randn(1,size(x))+1i*randn(1,size(x)))

then h=[h_1 h_2 h_3 ...h_k]

Does anyone know the better (smarter ) way to write this code?

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Answer 1

Rik 2019-2-9

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在 MATLAB Online 中打开

There are many ways to do something like this. You can either fill your array by using cellfun, or a loop, or a direct calculation.

Your input to the randn function seems a bit strange, as you can't mix the scalar input type with the vector input type.

%assuming you meant randn([1 size(x)]) and h=[h_1;h_2;h_K]
h=sqrt(1/2)*(randn([K,size(x)])+1i*randn([K,size(x)]));
%otherwise:
h_k=@(k) sqrt(1/2)*(randn([1,size(x)])+1i*randn([1,size(x)]));%adapt to your needs
h=1:K;%reshape to whatever shape you need
h=cellfun(h_k,num2cell(h));

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Rik 2019-2-18

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