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




Assignment Help
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
Create a shell script (lab2_q2.sh) to manipulate passwd file in /etc directory to automate some tasks. Filter list1.txt file containing the word "ball". Display on the screen
The reason of this three page paper is to discuss, Backup, Restore, and Roll forward Recovery in Apache Derby. Backup and restore capabilities are key to ensuring data recover
Explain Windows vulnerabilities and Linux vulnerabilities. Explain the Mac OS vulnerabilities, and vulnerabilities of mobile devices. Explain the motives and methods for intru
Explain the main reasons that firms implement intranets and one major obstacle to obtaining these benefits also explain the difference between a formal and an informal system.
What are the three different categories of command, support your answer by giving three examples. Give three good reasons, with valid explanation, to justify why partitioni
What are steps to take in ArcGIS to find the total number of schools in a City, Steps to take when you have a polygon file of zip codes, a point file of schools for a state,
Find an arbitrary non-preemptive schedule of the tasks. To make the problem simple, it is assume that the first instance of the three tasks {τ1, τ2, τ3} are invoked at time
The software house has been contacted by a Governmental Nuclear Reactor Agency that wants to change the current Operating System of their plant.