If a system has an average power level of 200, an average noise level of 6.66, and a bandwidth of 100 MHz, what is the effective limit on channel capacity? Suppose an engineer increases the number of possible signal levels from two to eight. How many more bits can be sent in the same amount of time? Explain.
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- 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?Data communication Suppose that the spectrum of a channel is between 8 MHz and 10 MHz, and the intended capacity is 8 Mbps. a. What should be the signal-to-noise ratio (SNR) to obtain this capacity? Constant values= c=3x^10°m/s, k=1,38x^10231/K IAssume that, in a Stop-and-Wait system, the length of the line is 10 Km, the volume of the pipe is 5Kbytes, and 1 bit takes 40 milliseconds to make a round trip. What is the bandwidth of the line?
- Data communication Suppose that the spectrum of a channel is between 8 MHz and 10 MHz, and the intended capacity is 8 Mbps. 1= With multiple signaling level, how many levels are required to obtain this capacity and how many bits can be transferred with each signal element? Constant values= c=3x^10°m/s, k=1,38x^10231/KA digital radio communication system receives a signal with signal power Sof 3 µW, and noise level of 200 nW, on a radio channel with upper cut-offfrequency of 2.42 GHz, and a lower cut-of frequency of 2.40GHz. . What is the signal to noise ratio in decibel?Given an AM radio signal with a bandwidth of 10 KHz and the highest-frequency component at 705 KHz, what is the frequency of the carrier signal? a. 700 KHz b. 705 KHz c. 710 KHz d. Cannot be determined from given information
- Using Shannon’s noisy theorem, what bandwidth is necessary to support a 1 Gbps, assuming a signal-to-noise ratio of 40 decibels? Suppose you want to achieve a bit rate of 15 Gbps using a maximum bandwidth of 900 MHz. What is the minimum allowable signal-to-noise ratio in decibels?A fiber optic cable has a loss of 16 dB per kilometer. What would be its attenuation if the cable is 2,000 feet long?Choose the right answer: 1- Shannon Hartley theorem states that a.The channel capacity does not increase as bandwidth increases b.The channel capacity does not become infinite with infinite bandwidth c.The channel capacity becomes infinite with infinite bandwidth d.Channel capacity does not have any tradeoff between bandwidth and Signal to noise ratio 2- In a communication system, data compaction a.reduces error in the data stream b.improves signal transmission efficiency c.provide addition bits for error detection d.increase signal strength to maximum value 3- Each symbol in QPSK modulation scheme consists of a.4 bits b.8 bits c.2 bit d.M number of bits, depending upon the requirement
- Suppose a signal travels through a transmission medium and its power is reduced to one-half. What is the attenuation in decibel?Imagine the length of a cable is 2500 metres. If the speed of propagation in a thick co-axial cable is 60% of the speed of light, how long does it take for a bit to travel from the beginning to the end of the cable? Ignore any propagation delay in the equipment. (Speed of light c = 3 x 108 metres / sec)If you need to design a system for transmitting the output of a minicomputer to a line printer operating at a speed of 30 lines/sec over a voice grade telephone line with a bandwidth of 3 kHz. Assume that the line printer needs 16 bits of data per character and prints out 50 characters per line. What should be the minimum S/N to proceed this transmission?