the difference between QPSK and offset QPSK? 2) 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
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- Four channels, each with a 150-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 10 kHz between the channels to prevent interference?Eight channels, each with a 4 KHz bandwidth are to be multiplexed together. What is the minimum bandwidth of the link if there is need for a guard band of 500 Hz between the channels to prevent interference ?if you are given alow-pass channel that ends at 40MHz and you knew that the SNR for this channel is 255, then the maximum number of signal levels to be used over this particular channel equal?
- Consider an OFDM system in which 1000 subcarriers are each to be modulated at 1000 bits per second. Assume that each subcarrier is to be modulated using QPSK. (a) What is the symbol transmission rate? (b) How close can the subcarriers be spaced and still be orthogonal? (c) Assume that at least one subcarrier always carries QPSK symbols. What is the lowest data rate that can be supported by this scheme?Five Channels each with a 100 KHz bandwidth are to be multiplexed together using Frequncy division multiplexing(FDM) scheme.What is the minimum bandwidth of the link if there is a need for a guard band of 10 Khz between the channel to prevent interference?Question No 3. - A) Explain about Multiplexing and Demultiplexing and types of Multiplexing. B) Five channels, each with a 400-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 50 KHz between the channels to prevent interference.
- Five channels, each with a l0a-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?Q15/ Channel 1 of Six channels PAM system handles 1KHZ signal. Channel 2 handles 2 KHz signals, channel 3 handles 3 KHz, channel 4 handles 6 KHz and channel 5 handles 6 KHz and channel 6 handles 25 KHz. The six channels are sampled at equal intervals of time using very narrow pulses at the lowest frequency that is theoretical adequate. The sampled signals are time multiplexed and passed through a LPF before transmission. a. What is the minimum clock frequency of the PAM system? b. Find Tx and Bx? c. What is the minimum cut off frequency of LPF used before transmission that will preserve the amplitude information on the output pulses? d. What would be the minimum bandwidth if these channels were frequency multiplexed, using AM technique and SSB technique?2. (a) In FDM, time synchronization is not necessary. Yes or No? Give proper reasons behind your answer. Write one example of TDM where extra information load (overhead) could be 300%.. (b) We need to use Time Division Multiplexing and combine 9 digital sources, each of 900 Kbps. Each output slot carries 9 bit from each digital source, but no extra bit is added to each frame for synchronization. Now, answer the following questions: i) What is the output frame duration? ii) What is the output frame rate? iii) What is the output bit rate? iv) What is the output bit duration? v) What is the size of an output frame in bits? vi) What is the input bit duration?
- 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?Given a channel with an intended capacity of 20 Mbps, the bandwidth of the channel is 3 MHz. what signal-to-noise ratio is required to achieve this capacity?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.