Week4 Lesson 1

7+6) This QUESTION FROM DIGITAL COMMUNICATIONS II course.

Q3: The bit stream 10110100, draw the sequence using following digital data formats : a)Unipolar RZ , b) RZ-AMI ,c)Dicode- RZ , d) Polar NRZ ,e) Bipolar NRZ, f ) Split Phase Manchester . * Note ( that the question relates to communication materials)

Q4 please answer base on your observation.

Plz complete solution or leave it hanging.

$1 $2 $3 $4 6d 2d 4d Consider the signal space representation in the figure above. All four messages are equally likely and the additive white Gaussian noise in the channel space representation has zero mean and variance o². (a) What is Pr(error s₁ is sent)? (b) What is Pr(error s4 is sent)? (c) What is Pr(error|s2 is sent)? (d) What is Pr(error s3 is sent)? (e) What is the average probability of symbol error?

9. The term “M-ary” in M-ary modulation derives from the word ___________.A. binaryB. baudC. bitD. bandwidth

24. The power of DSSS systems is largely in the spreading and dispreading of the received signal because it gives rise to a phenomenon known as ______________.A. channel codingB. spectral regrowthC. processing gain5D. frequency-hopping

If in a communication system BPSK, QPSK, QASK-8 are used for transmission and reception of digital data. (a) Determine the bandwidth B for each modulation scheme for a bit rate of 2kbps (b) Determine the symbol distance for each modulation scheme providing its complex plain presentation in terms of bit energy E (c) Determine the number of symbol and the symbol rate for each modulation.

Modulation index is called elasticity of modulation when it is expressed as a percentage. True False