I want to find the value of $N$ while $2000N=(0.9025)^{\log_2 N}$ (This is sample value not actual)

How to solve it?

The Whole Question which i am solving is $Pe=(Pt/N)(1-δ)^{\log_2 N}$

Where given values are If we use δ = 0.05, Pt = 1 mW, and Pe = 0.1 μW

  • $\begingroup$ Is $N$ supposed to be a real or an integer ? $\endgroup$ – Claude Leibovici May 7 '15 at 5:51
  • $\begingroup$ N will be integer $\endgroup$ – Adnan Ali May 7 '15 at 5:58
  • $\begingroup$ It seems that the equation and the numbers are not consistent. $\endgroup$ – Claude Leibovici May 7 '15 at 6:35
  • $\begingroup$ Its used in Fiber Optics' Distribution Networks – Star Topology. While N are number of users which can be attached to network. This is writen in my course slides $\endgroup$ – Adnan Ali May 7 '15 at 11:40

We'll take $\log_2$ of both sides. So,

$$2000N=0.9025^{\log_2N}$$ $$\log_2 2000N=\log_2 0.9025^{\log_2 N}$$ $$\log_2 2000 + \log_2 N=(\log_2 N)(\log_2 0.9025)$$ $$\log_2 2000=(\log_2 N)(\log_2 0.9025)-\log_2 N$$ $$\log_2 2000=(\log_2 N)((\log_2 0.9025)-1)$$ $$\frac{\log_2 2000}{(\log_2 0.9025)-1}=\log_2 N$$ $$N=2^{\frac{\log_2 2000}{(\log_2 0.9025)-1}}$$

Or you can write: $$N=2000^{\left((\log_2 0.9025)-1\right)^{-1}}$$

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  • $\begingroup$ There is a little change. I forgot to mention it. Can You please correct it accordingly. Let me change the Question $\endgroup$ – Adnan Ali May 7 '15 at 5:56
  • $\begingroup$ @AdnanAli Edited $\endgroup$ – Al Jebr May 7 '15 at 6:11

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