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Results tagged with equalization
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user 25557
5
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OFDM time vs. frequency domain channel estimation/equalization
Even though the complexity of OFDM is higher (overhead of preamble, pilot symbols, need to maintain orthogonality), the equalization simplifies to a single tap equalizer in frequency domain as the whole … You make sure the circular convolution happens by inserting cyclic prefix so in frequency domain it turns into a point-by-point equalization $Y[k]/H_{eq}[k]$ where $Y[k]$ is the received symbol at subcarrier …
- 2,303
1
vote
Accepted
Effect of Adding the cyclic prefix on the toeplitz matrix in OFDM
What you mean might be circulant matrix instead of toeplitz matrix. See section 3.4.4 in https://web.stanford.edu/~dntse/Chapters_PDF/Fundamentals_Wireless_Communication_chapter3.pdf about how the cir …
- 2,303
1
vote
Accepted
Channel estimation and interpolation by vector in OFDM
You can use various methods to interpolate the channel - Linear, Polynomial, Sinc Interpolation etc. But what you need to keep in mind is synchronization. You have to make sure that frequency and timi …
- 2,303
1
vote
Is DFE equalizer always blind or can we use reference signal?
I can answer for adaptive filter containing feedback path alone as I have implemented it recently (both Blind DFE and with Reference Symbols), but it should work for DFE containing feed-forward path a …
- 2,303
1
vote
Accepted
What's the computational complexity of MMSE equalizer in OFDM system
For a SISO channel, assuming you have estimated channel coefficients for each sub-carrier $k$, the MMSE equalizer is
$$
\hat{h}_k=\frac{h_k^*}{|h_k|^2 + \frac{N_0}{\sigma_x^2}}
$$
So you can see alrea …
- 2,303