+1-415-670-9189
info@expertsmind.com
Define what is meant by power efficiency
Course:- Operating System
Reference No.:- EM13943016




Assignment Help
Expertsmind Rated 4.9 / 5 based on 47215 reviews.
Review Site
Assignment Help >> Operating System

Answer the following questions. Explain your answer and show your work in a logical manner. Use any needed formula -- show the formula, the substitutions made, and explain why.

1. A TDMA cellular system uses a 200 KHz bandwidth carrier, which carries 8 channels. What defines or determines each channel, and how much bandwidth does each channel occupy and why?

2. Define what is meant by power efficiency and spectral efficiency for a modulation scheme? What is the measure used for each?

3. Order the following modulation types in terms of spectral efficiency (best to worse) and explain why (be specific, show a number and how you got it): 64-QAM, QPSK, 8-PSK, and BPSK. Assume that the r=0, perfect filtering.

4. Propagation in a wireless channel is sometimes modeled using the propagation index n. Explain how the propagation index n varies and why. If there are two channels, where n=2 for the first one and n=3 for the second one (as for both the same power is transmitted and the same modulation/coding is used), in which channel will the signal be detectable further away and why?

5. Describe why multipath occurs in wireless. Describe fast fading, and some technique to counter it.

6. Describe how direct sequence spread spectrum (DSSS) suppresses interference from other transmissions in the same frequency band.

7. A telephone switching board can handle 120 phones. Assuming the following, determine the outgoing traffic intensity and the number of channels:

* On average 5 calls/hour per phone

* 60% of all calls made are external

* Average call duration time is 4 minutes

* QoS = 0.9%

Please refer to the attachment for multiple choice questions.




Put your comment
 
Minimize


Ask Question & Get Answers from Experts
Browse some more (Operating System) Materials
An important task for modern operating systems is the ability to communicate and work with other systems. You will discuss your thoughts on the need for network operating sy
How will central authentication be handled in the Linux environment. How will printing be handled? Explain. How can shared files be encrypted. Determine the hardware to be use
Given a 4-way set associative cache unit with a 6-bit offset and a 12-bit index for a 32-bit address space with a LRU write-back policy, determine the nominal and actual size
it has come to our attention that this is not always the case and thus there is a need to forsake this principle and thus waste resources. Why is this situation of wasting r
Write a 3 page paper describing the transition from Mac OS 9 to Mac OS X. What impact did this have on the Macintosh user base? What role did Java play in this transition?
What are the implications of this mini-hypervisor? What kind of administration/management would need to be in place to keep all these optimized? What kind of security? Do yo
Design and edit audio and video clips for school projects. What operating system must library consider for this facility? Explain why?
Suppose if we learned anything from Katrina and Joplin, paper records are susceptible to loss en masse. Can you assume having 50,000 paper records blown for miles across Jopli