السلام عليكم
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لكن ياريت اللي عنده ادنى فكره عن حل الاسأله التاليه يساعدني:
Q 1. Suppose that a digital signal is to be transmitted from a video source generating 32 frames per second. If each frame consists of 20 Mbytes of data, what is the overall rate R of data in Gbps (Giga bits per second)?
Q 2. Name and explain at least four different tasks requiring a layered architecture such as OSI and TCP/IP. What difficulties may be faced if a layered architecture is not used to carry out the tasks you listed?
Q 3. In which layer of the OSI model do practical functions such as security authentication, connection ID establishment, data transfer, acknowledgements, and connection release take place?
Q 4. Consider a periodic signal that completes one cycle in 0.0001 second. What is the frequency of the signal?
Q 5. What is the bandwidth of a signal that ranges from 10 kHz to 100 MHz?
Q 6. Consider two-amplitude, four-phase 8-QAM encoding with 3-bit representation of signal amplitudes from the specification shown in the Figure.
011
010
101 100 000 001
110
111
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Show the time domain for the following bit pattern to be transmitted in one second. Also, indicate the baud rate.
0 0 0 0 0 1 0 1 0 0 1 1 1 0 0 1 1 1 1 1 0 1 0 1
Q 7 (15 points). Using the 8-bit ASCII character 'c' (01100011) as the binary digital signal to be transmitted, determine the following:
a) A table containing the first three Fourier coefficients (for n=1,2,3) and the respective rms amplitudes assuming the data rate of 19200 bps.
B) A plot of the three harmonics during 0 to T either via a C++/Java program or manually. If the plot is made manually, you must show at least 20 data points between 0 and T. You may also take help from the lab 2 applet to check your calculated values.
c) The fourth harmonic frequency of the binary signal if the bit rate is 9600 bps.