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The best way to do ae this measurement: Use a sine wave generator that is phase locked to your data acquisition clock with a frequency that's an integer multiple of your sample rate divided by the FFT length. If you do this, the period of your sine wave becomes an integer number of samples, you don't get any spectral spreading and you don't need any ...
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While I'd still like to know the answer to my question about how to merge multiple FFT bins into one, the real solution to increasing the selectivity was much easier to solve: I just had to use a different windowing function.
Here's the result of step 2 for 3 cases: no windowing function (blue), using the Blackmann window that I used earlier (green), and ...
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My understanding :
Non-Stationarity is mentioned in statistical sense where channel coefficients are non-stationary random processes. You can look for Wide-Sense Stationary Processes and Strict-Sense Stationary Processes and their definition and properties.
Time-Varying is with regards to time-domain channel impulse response characteristics. Time-variance ...
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