From 7f60ea012dd2524dae921a2a35adbf7ef21f2bb6 Mon Sep 17 00:00:00 2001
From: prashantsinalkar
Date: Tue, 10 Oct 2017 12:27:19 +0530
Subject: initial commit / add all books

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 3446/CH6/EX6.6/Ex6_6.sce | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)
 create mode 100644 3446/CH6/EX6.6/Ex6_6.sce

(limited to '3446/CH6/EX6.6/Ex6_6.sce')

diff --git a/3446/CH6/EX6.6/Ex6_6.sce b/3446/CH6/EX6.6/Ex6_6.sce
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+// Exa 6.6
+// To calculate capacity and spectral efficiency of the DS-CDMA system.
+
+clc;
+clear all;
+
+nb=0.9;//bandwidth efficiency
+nf=0.45;//frequency reuse efficiency 
+Cd=0.8; //capacity degradation factor 
+Vf=0.4;//voice activity factor 
+Eb_I0=7; // desired energy-to-interference ratio in dB
+L=1;//  efficiency of sector-antenna in cell 
+BW=12.5;//One way system BW in MHz
+R=16.2;//Information rate in kbps
+
+//solution
+Eb_I=10^(Eb_I0*0.1);//To convert from dB to a normal value
+Nu=(nf*nb*Cd*L/Vf)*(BW*1000/(Eb_I*R));//Capacity of system
+Seff=round(Nu)*R/(12.5*10^3);
+printf('Capacity of system is %d mobile users per cell\n ',round(Nu));
+printf('Spectral efficiency of TDMA system is %.3f bits/sec/Hz\n',Seff);
+
+disp("In these calculations, an omnidirectional antenna is assumed. If a three  sector antenna (i.e., G=3) is used at a cell site with lamda(efficiency of sector-antenna in a cell)= 2.6, the capacity will be increased to 325 mobile users  per cell, and spectral efficiency will be 0.421 bits/sec/Hz.")
-- 
cgit