From b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b Mon Sep 17 00:00:00 2001
From: priyanka
Date: Wed, 24 Jun 2015 15:03:17 +0530
Subject: initial commit / add all books

---
 25/CH12/EX12.3/12_3.sce | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)
 create mode 100755 25/CH12/EX12.3/12_3.sce

(limited to '25/CH12/EX12.3/12_3.sce')

diff --git a/25/CH12/EX12.3/12_3.sce b/25/CH12/EX12.3/12_3.sce
new file mode 100755
index 000000000..79dabd26b
--- /dev/null
+++ b/25/CH12/EX12.3/12_3.sce
@@ -0,0 +1,18 @@
+// example:-12.3,page no.-677.
+// program to calculate the input and output SNR.
+f=4*10^9;B=1*10^6;Grf=10^2;Gif=10^3;Lt=10^0.15;Lm=10^0.6;To=290;
+Fm=10^0.7;Tm=(Fm-1)*To;Tp=300;Tb=200;eta=0.9;
+Frf=10^0.3;Fif=10^0.11;k=1.38*10^-23;
+Trf=(Frf-1)*To;
+Tif=(Fif-1)*To;
+Trec=Trf+(Tm/Grf)+((Tif*Lm)/Grf);
+Ttl=(Lt-1)*Tp;
+Ta=eta*Tb+(1-eta)*Tp;
+Ni=k*B*Ta;
+Ni=10*log10(Ni/0.001);  // converting in to dBm.
+si=-80; // in dBm.
+SNRi=si-Ni; // input SNR.
+Tsys=Ta+Ttl+Lt*Trec;
+SNRo=si-10*log10((k*B*Tsys)/0.001);
+disp(SNRi,'input SNR in dB = ')
+disp(SNRo,'output SNR in dB = ')
\ No newline at end of file
-- 
cgit