Figure $2$ shows tier $1,$ tier $2,$ and tier $3$ co$-$channel cells for $N=3.$ We consider the intended base

station at the origin of the coordinates, i$.$e$.,$ at $(0,0).$ Let the mobile station be located at $(1,0).$ We

need to study the contributions of the cells in tier $1$ and tier $2($ that can be extended to tier $3)$ to the

overall co$-$channel interference.

Draw graphs similar to that of Fig. $2$ indicating the frequency reuse and tier $1,$ tier $2,$ and tier $3$

co$-$channels for $N=1$ and $N=7.$

Start Matlab and create a folder and call it ELEC$8630$Assign. Make sure that your working

folder in Matlab is in that folder.

Download the files expla.m and cocinter.m from the course Brightspace and run expla.m$.$

this file will calculate the contribution of tier $1$ and tier $2$ co$-$channels to the overall S$/$I ratio

for $n=2,3,$ and $4$ for $N=1,3,$ and $7$ cases.

Record the results and provide your comments.

Extend the programs to consider tier $3$ cells.

For tier $1$ case, compare with the approximate case provided by the above equations.

Fig. $2$