Problem 3 A TDMA system provides 48.6 kbps data rate for a single user over one physical channel when 3 users are supported in a channel with 6 time slots in a frame. When the frame length is Tf = 40 ms, how many bits does one time slot contain?

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.

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Data communication subject

Consider TDM-based circuit switching with 8000 frames per second and 32 time slots per frame. During each time slot 8 bits are sent. What is the total transmission rate of the whole link in kbps?

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A modem is to be designed for use over a telephone link, for which the available channel bandwidth is 6khz, and average signal to noise ratio on channel is 30db. What is the maximum error free data rate that can be supported on this channel and how many signalling state must be used? Explain the Result with reference to the channel capacity theorem.

4. Three input channels need to be multiplexed using TDM, Their bit rates are 120 kbps, 80 kbps, and 40 kbps, respectively, (a) What is the required output bit rate for the TDM? (b) How to set the relative size of each time slot in one frame? (e) What is the minimum frame size and the corresponding frame rate?

In synchronous TDM, it is possible to interleave hits, one bit from each channel participating in a cycle. If the channel is using a self-clocking code to assist synchronization, might this bit interleaving introduce problems because there is not a continuous stream of bits from one source?

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?