Gheorghe Zaharia

5 Questions 17 Answers 0 Followers

Questions related from Gheorghe Zaharia

I am looking for multiplicative groups of complex, unitary matrices of size 2x2. Does anyone have some suggestions?

If possible, each element of each matrix should be a*exp(-2k*pi/2n), (k, n = positive integers, a > 0) or zero.

12 December 2017 3,268 3 View

Is it possible to use a better smoothing window than the uniform window?

I think I was too exigent with my previous question, asking the best smoothing window. In fact, I would like to reformulate the question: is it possible to use a better smoothing window than the...

12 December 2017 5,750 3 View

Which can be the best choice of a smoothing window?

For measured data x = [x(1) x(2) … x(N)] affected by noise, smoothing is a usual choice. It is possible to use a uniform smoothing by replacing the initial value x(k) by the mean of the vector s =...

10 October 2017 8,782 1 View

For massive MIMO-OFDM systems, how much time must be used in order to periodically estimate the channel matrix?

Many research activities on massive MIMO-OFDM systems consider perfect or good enough knowledge of the channel matrix for each narrow-band sub-channel. However, for fast time-variant channel, the...

10 October 2016 9,220 7 View

Can someone advise on the nature of the information source obtained by coding?

Does anyone know of a proof of the fact that by coding a memory-less information source X, the resulting information source Y has memory and H(X)=L*H(Y) where L=average code length?

08 August 2013 6,907 8 View