Index of /research/sparse/mat/Lucifora

 Name                    Last modified       Size  Description

 Parent Directory        02-Nov-2009 14:42      -  
 cell1.mat               06-Sep-2008 05:15    95k  
 cell2.mat               06-Sep-2008 05:15    94k  

GSM cell traffic matrices from Salvatore Lucifora, Telecom Italia Mobile.

Ing. Salvatore Lucifora
TIM R/SR-TI
via L. Rizzo, 22
00136 Roma
 
tel.   +39 06 3900 9241
fax.   +39 06 3900 9315
cell.  +39 335 7534668
email:  <mailto:slucifora :at the domain:
mail.tim.it> slucifora :at the domain:
mail.tim.it


These 2 matrices come from a software tool that evaluates the correct
dimensioning for GSM cell with the coexistence of 2 kinds of traffic channels
(Full-Rate and Half-Rate: the latter requires only half bandwidth with
respect to the FR channel). The tool requires the solution of a sparse linear
system Ax=b.

The cell1.rua and cell2.rua matrices have the same nonzero pattern, and
very similar values.  The 1-norm of C1-C2 is only 0.002, compared with
a 1-norm of about 416 for both C1 and C2.  MATLAB's condest reports a
condition number of 10^12 for C1 and 10^20 for C2.