Communication Systems Assignment (Doc)

Added on - 29 Apr 2020

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Running head: COMMUNICATION SYSTEM1Communication SystemsNameInstitution
COMMUNICATION SYSTEMS2CDMAQuestion 1To test whether the spreading codes are orthogonal, we apply the dot product.U1U2=[11111][11111]=3U2U3=[11111][11111]=1U1U3=[11111][11111]=3Therefore, the spreading codes are not orthogonal.Question 2UserU1=[11111]Bit sequence b=[b0,b1]=¿[1 1]The transmitted symbols will be=[~b,b,~b,b,b]=¿=[0,0,1,1,0,0,1,1,1,1]UserU2=[11111]Bit sequence b=[b0,b1]=¿[1 1]The transmitted symbols will be=[~b,~b,b,~b,,~b]=[0,0,0,0,1,1,0,0,0,0]UserU3=[11111]Bit sequence b=[b0,b1]=¿[1 -1]The transmitted symbols will be=¿
COMMUNICATION SYSTEMS3Question 3The received signal ignoring noise is the same as the transmitted signal which will be[0,0,1,1,0,0,1,1,1,1]for userU1[0,0,0,0,1,1,0,0,0,0]for userU2[1,1,0,1,1,1,1,1,0,1]for userU3Question 4Despread signals for the three users are computed as follows:UserU1=[11111], Despread signal for userU1=[1,0,1,0,0]UserU2=[11111]Despread signal for userU2=[1,1,0,1,1]UserU3=[11111]Despread signal for userU3=[0,1,0,0,1]Question 5The number of users,N=1+WREbIo=1+1286=22.333323usersQuestion 6Each subscriber generates 2 calls/day¿10×2mindayThe traffic load is¿10×2×6024×3600=172=0.013888889Erlangssubscriber
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