Assignment Problem: Wireless Communication Systems
In your report, provide the answers and solutions to the following questions:
Problem 1: For wireless networks, explain what the main components of a wireless network are and what side information may be added to the data to provide a reliable communication between these components. (
Problem 2: List and explain the main harmful effects in a wireless communication system. Select two of these issues (e.g. noise, security,...) and describe what general approaches are followed to resolve them.
Problem 3: Explain
i) What the main advantages of MPSK (BPSK, QPSK, . . .) over other digital communication systems are,
ii) What the difference(s) between bitrate and symbol rate is(are) and what the ratio between them for an 8-PSK is.
ii) What a "constellation diagram" refers to.
Problem 4: For a digital communication system,
(i) If the energy per bit is 12 dB and the noise level is 8 dB, what is the spectral efficiency?
(ii) If the channel bandwidth increases, what will happen to the spectral efficiency and Eb/N0.
(iii) In a binary communication system with an asymmetric transmitter, bits 0 and 1 are generated with 0.4 and 0.6 probabilities respectively. The receiver receives the bit stream of data through a noisy channel with the noise mean of zero and variance of 0.2. If the bit amplitudes for 1 and 0 are respectively 0.75 and -0.75, what will be the BER.
Problem 5: Explain the concepts and the advantages/disadvantages of packet switching versus circuit switching in a wireless communication network.
Problem 6: Delay is an important parameter in assessing the quality of a network. Describe various causes of delay and explain how the long delays can cause information packet loss.
Problem 7: Assume we have 10 servers, located in Europe, each can transmit with a bitrate of 100 Mbps and their corresponding 10 receivers, located in the US, each can receive the data at the rates of 80 Mbps. The wireless channel between the two continents can support up to 0.9 Gbps. Using a simple calculation mention what the throughput of the whole system is.
Problem 8: Explain the use of cyclic-redundancy codes (CRC) in the computer communication network. Then, consider the 13-digit data of "1110011010110"; find the codeword to be sent to the receiver if the generator is "1010".
Problem 9:
(i) Create a MATLAB Simulink model to implement the following modulation system.
y(t) = (1 + mx(t))cos(3000t)
where x(t) is the 2000 samples (starting from the last 5 digits of your student number) of signal "speech" available in the "Data" subfolder of "Lab" folder of your Wireless Communication Module in NOW.
Hint: after you read the required data samples, normalise it to between -1 and +1; i.e.
x(t) ← x(t)/max(abs(x(t))
Provide a graph of the signal segment you used, Simulink simulation schematic, and the output y(t) for m = 0.1, 0.7, and 1.0.
(ii) Use the random binary source generator (such as Bernoulli) in Simulink to replace (1 + m x(t)) in the above equation with a binary signal varying between 0 and 1. Provide the input signal, Simulink schematic and the output. Which type of modulation is this?
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