H.W: If the bandwidth of PAM system not exceed 4kHz is used to transmit voice signalsampled at Nyquist frequency. Calculate the bandwidth required to transmit the samesignal using PPM system with rise time of 2% of pulse duration.

PAM (Pulse Amplitude Modulation) involves varying the amplitude of pulses in accordance with…

Answered: H.W: If the bandwidth of PAM system not…

Computer Networking: A Top-Down Approach (7th Edition)

7th Edition

ISBN:9780133594140

Author:James Kurose, Keith Ross

Publisher:James Kurose, Keith Ross

Chapter1: Computer Networks And The Internet

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Problem R1RQ: What is the difference between a host and an end system? List several different types of end...

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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?
Problem 2 In a DSB-SC system, the carrier frequency is 5 kHz and the message signal is given by m(t) 2cos1000nt + sin2000nt. Find and sketch the spectra of the message signal and modulated signal. Identify the upper sideband (USB) and the lower sideband (LSB) spectra in the DSB-SC modulated signal. Determine the average power in the message signal as well as in each frequency component of the modulated signal. Problem 3 The modulating signal m(t) = cos1000nt cos3000nt is multiplied by the carrier c(t) = cos(2nfct), where f. = 5 kHz. Determine and sketch the spectra of the modulating and modulated signals. Identify the upper sideband (USB) and the lower sideband (LSB) spectra in the DSB-SC modulated signal.
5. a) Consider a noise-free communication channel with spectrum between 4 MHz and 6 MHz. Using Nyquist's formula, calculate the maximum capacity of the channel. Assume that only 2 signal levels are used. Bandwidth, B = Capacity, C = b) If the above communication channel is not noise free, and the signal to noise ratio (in decibel) for the channel is 5 dB, what is maximum capacity of this channel? (use Shanon's formula) SNR = Capacity, C =
2. You have a modem that can operate at a symbol rate of 9,600. Design a modulation system to allow the modem to transmit at a data rate of 76,800 bps. Specifically, you need to indicate how many amplitude levels and phase levels this modem must be able to generate. (Your design should vary both the amplitude and the phase of the carrier wave signal.) a) Required total alternative signal states: b) Amplitude levels: c) Phase levels:
q10- For an Orthogonal frequency-division multiplexing data transmission with a cyclic prefix of 20 and bandwidth of 30 MHz, there are 100 carriers used for data transmission, the outer 20 carriers are zeroed, and 8 carriers for channel estimation and synchronization a) Our task is to find the bandwidth of each subcarrier. Answer: Answer Khz b) Calculate delay spread in seconds Answer: Answer Seconds
Q/ If the bandwidth of PAM system not exceed 4kHz is used to transmit voice signal sampled at Nyquist frequency. Calculate the bandwidth required to transmit the same signal using PPM system .with rise time of 2% of pulse duration
A PWM signal has a period of 100 millseconds. The initial pulse width is 10 millseconds. This means theresolution is 10%. True False
Cn = 2 H log2 V Cs = H log2 (1 + S/N) %3D Suppose we are sending a signal using 3 bits over a 8 kHz channel with Signal to Noise Ratio (SNRdB) of 350aB What is the maximum achievable data rate? (Please SHOW your work)
answer asap
q10-
need the solves asap plz
QUESTION 28 An engineer has designed transmission equipment to transmit 7200 symbols per second while encoding 8 bits per symbol. If the signal to noise ratio is 400:1 and the channel bandwidth is 3625 Hz, has the engineer's design exceeded theoretical limits? O Yes, both the limit on symbol rate and the limit on bits per symbol have been exceeded. O Yes, but only the limit on symbol rate has been exceeded. O Yes, but only the limit on bits per symbol has been exceeded. O No, none of the theoretical limits have been exceeded.

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H.W: If the bandwidth of PAM system not exceed 4kHz is used to transmit voice signal sampled at Nyquist frequency. Calculate the bandwidth required to transmit the same signal using PPM system with rise time of 2% of pulse duration.