Class Assignment 1 A digital signal has 16 levels . How many bits are needed per level? We calculate the number of bits from the formula Suppose a signal travels through a transmission medium and its power is reduced to one-eighth. In this case, the attenuation (loss of power) can be calculated as A signal travels through an amplifier, and its power is increased 7.5 times. the amplification (gain of power) can be calculated as The signal Power is 120 and the noise power is 15 . Calculate the SNR in dB For a noisless channel find the Bit rate if the bandwidth is 2500bps and signal level is 16. To send 500 kbps over a noiseless channel with a bandwidth of 100 kHz, how many signal levels do we need? Using a channel with a 10 MHz bandwidth. The SNR for this channel is 15; what is the appropriate bit rate and number of signal level? Find the performance of the channel based on the throughput: Channel with Bandwidth 1Gbps which passes frames 15000 / min . each frame has 12000 bits . Analyze the value of performance and suggest measures to improve the performance if required . What is the transmission time for a 8-Mbyte message (an image) if the bandwidth of the network is 1 Mbps? Assume that the distance between the sender and the receiver is 15,000 km and that light travels at 2.4 10^8 m/s. What is the propagation time for a 5-Mbyte message (an image) if the bandwidth of the network is 1 Mbps? Assume that the distance between the sender and the receiver is 12,000 km and that light travels at 2.4 10^8 m/s.