B. P. Lathi, Zhi Ding - Modern Digital and Analog Communication Systems-Oxford University Press (2009)

600 PERFORMANCE ANALYSIS OF DIGITAL COMMUNICATION SYSTEMS
Fi g ure 10.50 4- -
Scatter plot of
.,.
- - - -- - - - - - -- - - - - -
the matched filter
output for the . .
.
..
16-QAM
signaling with
. , ""
.
•. :· • • •
.
.
•·
root-raised
cosine pulse
when
Eb/N = 18 dB.
.• f
•
. .
•
•
. .
.. • .. ..
·•·
. . -
--4 '----'------'-------'----'
--4 -3 -2 -1 0 2 3 4
Real part of matched filter output samples
·•· . ..... . : .
Fi g ure 10.5 1
BER from
non coherent
detection of
binary FSK.
10 ° ,--------------------------
-- Analytical BER
--e-- Noncoherent FSK simulation
10-6 '-------'-----'-----''-----'----'-----'----'------'-----'-----'
1 2 3 4 5 6 7 8 9 1 0 11
EtJN, dB
s_data=round (rand (L, l) );
% Generating random phases on the two frequencies
xbasel= [exp (j*2 *pi* rand) O] ;
xbaseO=[O exp (j*2 *pi* rand) ];
% Modulating two orthogonal frequencies
xmodsig=s_data*xbasel+ (l-s_data )*xbaseO ;
% Generating noise sequences for both frequency channels
noisei=randn(L,2) ;