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  1. #1
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    Basic questions to clarify (channel gain, taps, OFDM matlab sim)

    Hi everyone,

    I'm doing a MATLAB simulation of OFDM, I'm following some steps to do that.

    The first step:
    You have a channel with independent zero mean complex Gaussian taps along with exponentially decaying power profile E{|hk|2|}=e-k/3 where k ∈ [0,21].

    First of all, does this notation E{|hk|2|}=e-k/3 mean "The expected value of the channel gain hk is the variance "σ" e-k/3"? And is it "σ" or "σ2"?

    And what are exactly the taps?

    Anyway, I assumed that σ=e-k/3, so here is my matlab code for the first step:

    Code:
    N=22;
    k=0:21;
    sigma=exp(-k/3);
    h=(rand(N,1)+j*rand(N,1))*sigma;

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  2. #2
    Advanced Member level 1
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    re: Basic questions to clarify (channel gain, taps, OFDM matlab sim)

    In frequency selective channels, there is intersymbol interference, and the received signal is written as



    Channel taps are the number of resolvable paths (Search for resolvable paths).


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