课件教程report-copyece3311报告.pdfVIP

ECE3311/B-term2013

PrinciplesofCommunicationSystems

FINALPROJECT

Description

ThegoalofthisfinalprojectistosimulateadigitalradioreceiverusingMATLAB

simulation,tomodulateandequalizeapulse-shapeddigitalsignaltransmittedatradio

frequencies.Thereceiverisbrokeintoseveralpartsandeachpartworkswell.Following

aredetailsofthereceiverandcorrespondingplotstoeachpartofthereceiver.

Methods

function[decoded_text,y]=Rx(r,rolloff,desired_user)

T=12.8e-6;%NominalSymbolPeriod

Fs=1.9e6;%samplefreq

M=T*Fs;

Ts=1/Fs;

L=4;

a=zeros(1,20);

r=[ra];

Thisisthefirstpartofthereceiverwhichgeneratetheoriginalsignal:

5

e

d

u

t

i0

l

p

m

a

-5

00.020.040.060.080.10.120.140.16

seconds

4

x10

3

e2

d

u

t

i

n

g

a

m1

0

-1-0.8-0.6-0.4-0.200.20.40.60.81

frequencyx106

Figure1Originalsignalpulse

Therearethreeusersandfortheeasypartuser3ischosen,sousingaband-passfilter

(BPF),theothertwouserswerefilteredanduser3waschosen:

%BPF

freqs=[00.340.360.480.511];%NormalizedFrequency

amps=[001100];%Amplitude

h=firpm(140,freqs,amps);%Filterspecs

BPF=filter(h,1,r);%filtering

2

1