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Hello,
Could you please help me how to interpret the logical operators in the following Matlab code?
My questions below. I would be glad if you could explain them.
1-Why there is a structure used in the constructor function below?
2-In the constructor function there is a tilde (~) operator...
Hello,
Could anyone please help me in understanding the sparse channel estimation in OFDM systems? How can we construct the sparse channel matrix? What is the meaning of dictionary matrix for sparse channel?
Thanks in advance!
I have made some searches and have below questions on this.
So far I understand that there two methods for time synchronization which
are data-aided and non-data aided methods, and in the data-aided methods
the training subcarriers are included in OFDM symbol and they are
correlated with the...
Hello,
I am trying to understand how the receiver decides the length of OFDM symbol in time domain before it goes into DFT process at the receiver. The complete OFDM symbol (with Cyclic Prefix added) is propagated by the transceiver through the channel and it is received at the receiver with a...
Hi,
I am trying to understand the difference(s) between OFDM and GFDM which are
used as a multicarrier modulation techniques in wireless communication. As
far as I know the OFDM uses the orthogonal subcarriers and the GFDM is with
the non-orthogonal subcarriers when designing a transmitter...
Hellow,
Could anyone plz explain me what the purpose of normalizing the signal?
If we have two signal on hand, how it is used when comparing these two signals?
Thanks in advance!
Thank you rkt_167.
I am also trying to understand how we use correlation in OFDM system. And how to correlate the signals at the OFDM system receiver?
Cyclic Prefix added OFDM symbol is received at the receiver, and in order to get each OFDM symbol we want to know where the OFDM symbol starts...
Hi All,
Cross-correlation is used between two signals to see if there is a similarity between them, and do so lets say that we have noisy signals x(t) and y(t) which are received from the channel at the receiver.
By performing the cross-correlation we see that there is a peak in the plot...
Hello weetabixharry,
Thanks for your reply and explanations!
Let me give you more details about what I am trying to find out and visualize about the covariance and correlation.
We have a received signal y(t) with the precesence of the noise n(t) in the channel h(t). And the y(t) is the...
I would appreciate if anyone could please explain me why we use covariance and correlation in estimating channel impulse response H? What is the purpose of using these statistics in channel estimation?
Many thanks!
Hello,
Could anyone please explain what the logic is behind using hermitian matrix in the formula of least squares estimation in OFDM system.
Thanks in advance!
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