.a) What does zero frequency mean? How does SNR value affect channel quality?
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- Question 4 a) Mention two (2) advantages that infrared communication has against microwave. b) List and briefly define important factors that can be used in evaluating or comparing the various digital-to-digital encoding techniques. c) What is the difference between QPSK and offset QPSK? d) Five channels, each with a l00 kHz bandwidth, are to be multiplexed together. What is the minimum bandwidth of the link if there is a need for a guard band of 10kHz between the channels to prevent interference?Consider a channel with bandwidth B = 2Mhz and a signal to noise ratio of 40dB (expressed in log scale, remember the conversion!). What is the maximum data rate achievable? Explicitly mention the theorem and the calculation that lead to the solution.10. For a 10 Mbps data link using 12,000-bit frames, and assuming that electrical signals propagate at 2.5 x 108 m/s: a. How long does it take to introduce a single frame onto the link? b. How long does it take for the trailing edge of the frame to travel 1,620 km? c. What is the total transmission time of this frame, from start to finish?
- Assume you are working as a Network Engineer for a Telecommunications service provider and your task is to estimate the feasibility of a 20 km link between two buildings with one access point and one client radio. The access point is connected to an antenna with 12 dBi gain, with a transmitting power of 500 mW and a receive sensitivity of -84 dBm. The client is connected to an antenna with 10 dBi gain, with a transmitting power of 16 dBm and a receive sensitivity of -82 dBm. The cables in both systems are short, with a loss of 3 dB at each side at the 900 MHz frequency of operation. What is the link margin? By examining the link margin, comment on the reliability of the link.Consider a communication channel with bandwidth B = 8000 Hz. Suppose the channel has a signal-to-noise ratio S/N = 541. What is the maximum data rate of this channel? ? What is the minimum number of signal levels needed to achieve a data rate of 64000 bps?Exercise (3): The Bandwidth of a voice signal is 3000HZ, what is bit rate required to send this signal in digital form when it is sampled and coded using 16bit/sample?
- Mention two (2) advantages that infrared communication has against microwave b) List and briefly define important factors that can be used in evaluating or comparingthe various digital-to-digital encoding techniques. c) What is the difference between QPSK and offset QPSK? d) b) Five channels, each with a l00 kHz bandwidth, are to be multiplexed together. What is the minimum bandwidth of the link if there is a need for a guard band of 10kHz between the channels to prevent interference?a. Mention two (2) advantages that infrared communication has against microwave b. List and briefly define important factors that can be used in evaluating or comparing the various digital-to-digital encoding techniques. c) What is the difference between QPSK and offset QPSK? b) Five channels, each with a l00 kHz bandwidth, are to be multiplexed together. What is the minimum bandwidth of the link if there is a need for a guard band of 10kHz between the channels to prevent interference?6. Consider a communication channel with spectrum between 20 MHz and 30 MHz. If the signal to noise ratio (in decibel) for the channel is 3 dB, what is maximum capacity of this channel? (Hint: use Shanon's formula) 5
- For data is transmitted over twisted-pair cable, you have these characteristics: A signal's power on the channel is 60 dB, signal attenuation is 2 dB per 100 meters, and average noise power on the cable is 0.15 dB per meter. Answer the following questions: What's the S/N ratio at the end of a 60-meter channel? What's the S/N ratio at the end of a 1.5-kilometer channel? What's the maximum channel length if the receiving device requires at least 25 dB of S/N ratio for reliable operation?3. The data rate (in each direction) necessary for a digitized telephone call is 8 Kbps. This means that a two-way full-duplex call between two parties takes 16Kbps. How many calls can be made concurrently with the data rate necessary to transport just one HDTV channel?QUESTION 25 A microwave data link has been designed to operate at 110,000 symbols per second while encoding 14 bits per symbol. The receiving equipment requires at least a 50 dB signal to noise ratio in order to operate without significant error. At least 55 kHz of bandwidth on the transmission channel are required for the attempted system. The data rate of the designed link will be 1.54 Mbps. If the actual signal to noise ratio is 100 dB, the system could support encoding as many as 17 bits per symbol. There is not enough information given to determine the minimum transmission power needed to make sure an acceptable power level arrives at the receiver. Exactly 16,348 different symbols would be needed to support 17 bits per symbol. If the background noise at the receiver is -50 dBm, the receive power will need to be at least 1 dBm.