Nyhetsflöde

In exercise 12, we have a reuse factor of 9. This means that km or lm can be equal to 0?

Yes.

Also note that in question 12, "reuse 3" means that there are 3 cells in one cluster, "reuse 3/9" means there are 3 sites, 9 cells in one cluster. So, remember to use three sectors per site in the latter case.

I have one problem with exercise 12 because when I set kn=4 ,ln=1 i get  NaN  as result in sta.iul  and  sta.sirul; morover this appears to be also the median (sta.sirul) and therefore plotting median of Sir to answer the question about the number of cluster we need to use then i have gap (no value)  for the combination (4,1) so 21cluster .....how is possible??? thanks for the reply  

I don't know which parameters you used for cluster size, sps, offered traffic, etc, but my guess is that you are using a high reuse factor and high load value. Therefore some users in a cell cannot be assigned a channel because all channels in that cell were already in use. In that case this user will not be admitted to the system, so its interference and SINR values will be NaN. When you calculate the median of an array which includes NaN values, Matlab returns NaN. These NaN values cannot be plotted, therefore you see gaps in your plot. So, when you calculate the interference and SINR values, do not include the users which are not admitted to the system. See the help for "isfinite" function.

to be brief this what my par contains at the begining: (the only diffrence is for that case Kn= 4 and ln =1)

par =

frametime: 1
nframes: 1
slottime: 0.12500000000000
nslots: 8
seed: 1
cellradius: 400
km: 1
lm: 1
kn: 1
ln: 1
sps: 1
gainconst: -28
noise: -128
alpha: 4
sigma: 0
raa: 0.50000000000000
corrdist: 110
offtraf: 10
mht: Inf
amean: 0.20000000000000
vmean: 1
homargin: 3
pinit: 33
pmax: 33
rbermax: 1
usefastf: 0
kpc: 20
usefh: 0

In exercise 14, we have to make a suitable choice of number of clusters. This number should be the one we found in exercise 12? If not, what is the criteria to choose that number?

Yes, you should use the result you obtained in exercise 12. If you think that your answer to ex. 12 may be problematic for some reason, use a slightly larger number than what you obtained in ex.12 so that you do not underestimate the effect of interference.

Also in exercise 15 we have to use the same cluster number?

Yes. When you run simulations in ex. 13, 14, 15 you need to use your result from ex.12.

In question 15, in order to plot SIR, should we use cdfplot or cdfplotmed?

Cdfplot and cdfplotmed do almost the same job. The difference is that cdfplotmed can handle matrix input and plots all colums as separate data series. Depending on how your input data is structured, you could use both functions.

Hello!

I´m looking for someone to do the labs with. So anyone that does not have a labpartner yet please contact me at:  emasve@kth.se

/ Emanuel