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Consider the arrival scenario of Figure; the location of the packet arrival times arc permissible as shown under pure ALOHA, but not under slotted ALOHA.
What is the probability of exactly two collisions before a successful transmission?
Measurements of a slotted-ALOHA channel show that 20% of the slots are idle. What is the normalized total traffic on the channel?
Show that the sum of two Poisson processes, with rates ?1 and ?2, is also a Poisson process, with rate ?, = ?1 + ?2.
A 10-MHz transponder is occupied by 200 identical carriers, half servicing stations with G/T = 40 dB/K, the other half servicing stations with GIT = 37 dB/K.
Compute the efficiency of the communications resource (CR) for the case of 1, 2, 5, 10, 20, 50, and 100 slots per frame.
Consider a token-ring network operating at a transmission rate of 10 Mbitsls over a cable having a propagation velocity of 200 mins.
Is there any theoretical capacity advantage in providing users with FDMA service versus TDMA service?
Demonstrate that p(f) given above is in fact a probability density function, and com-pute the mean and variance of f.
What are the advantages and disadvantages of data-aided versus non-data-aided synchronizers?
If the mean time between cycle slips is 1 day, what is the probability of cycle slips less than 1 hour apart? More than 3 days apart?
During aided acquisition it is desired that this loop be scanned throughout a 1000-radian uncertainty region in 1s.
Consider the operation of an open-loop symbol synchronizer whose band pass filter (BPF) has a bandwidth of 0.1/T hertz, where T is the symbol period.
A deep-space probe is moving away from the earth at a nominal velocity of 15.000 rids with a velocity uncertainty of ±3 m/s.
The receiver operates with a second-order PLL that has a pull-in range of ± 1 kHz. Assuming that the loop acquires using self-acquisition.
What is the definition of synchronization in the context of a digital communication system, and why is it important?
Why may a synchronization system that works well for a home radio receiver possibly be inadequate in a high performance aircraft?
The linearized loop equation depends on an approximation. What is that approximation, why is it appropriate for loops that are in lock or near lock.
Second-order phase locked loops have several advantages in their performance. and as the basis for phase-tracking performance analysis.
Why are continuous phase modulation schemes of increasing importance in modern communications system, and what synchronization challenges do they pose?
Describe a situation in which it may be appropriate to require a transmitter to synchronize itself to the expectations of a receiver.
The multiplexed composite is to be made up of inverted sidebands and is to occupy the spectral region from 30 to 50 kHz.
A receiver is tuned to receive the lower sideband (LSB) of a radio-frequency (RF) carrier wave with frequency, fc = 8 MHz.
Why do binary and 4-ary orthogonal frequency shift keying (4-FSK) manifest the same bandwidth-efficiency relationship?
Explain how you would proceed with the problem if the channel were specified as a Gaussian channel instead of a BSC.