ECET 380 RANK Redefined Education--ecet380rank.com

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Information about ECET 380 RANK Redefined Education--ecet380rank.com

Published on June 14, 2019

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1. ECET 380 Week 1 iLab Simulation of a Fundamental Communication System FOR MORE CLASSES VISIT www.ecet380rank.com Key Results: Key Conclusions (technical): Key Conclusions (critical thinking): I. OBJECTIVES 1. Introduction to the MATLAB Communications Toolbox. 2. Use various functions of the Communications Toolbox to simulate a fundamental communication system. 3. Using stem plots, scatterplots, and BER plots, observe various characteristics of the transmitter, channel, and receiver in both ideal and noisy conditions. II. PARTS LIST Equipment: IBM PC or Compatible with Windows 2000 or Higher Software: MATLAB Version 7.1 or Higher III. INTRODUCTION The MATLAB software is a popular and powerful tool frequently used across varied industries in the simulation and modeling of systems, wireless and otherwise. Through the use of MATLAB, systems behavior can be predicted and analyzed in conditions as close to practical as possible. Of special interest to the study of wireless systems is MATLAB’s Communications Toolbox. This Toolbox can be used to simulate, evaluate and analyze an entire wireless system from end to end. Models are developed to include the entire system, from the baseband signal conditioning, to modulation schemes, through the effects of stochastic radio channels, and finally to demodulation and error calculations. Having the ability to use MATLAB’s Communications Toolbox gives the aspiring wireless communications engineer a solid background for future investigation in this fast- expanding field. IV. A. Overview of the Communications Toolbox 1. Open MATLAB and familiarize yourself with the Default Layout, which includes the Current Directory,

2. Command History and Command Window. You will be working primarily in the Command Window, but the other windows may provide useful information in the future. 2. The Command Window is a command line environment, much like DOS or UNIX. You will type all commands in this lab at the >> prompt. Following each command, you will need to hit the Enter key. Also, if you are working in the Citrix environment, there may be a lag in MATLAB’s response. Some operations are VERY processor intensive – just be patient. =========================================== === ECET 380 Week 2 iLab Simulation of a Rayleigh Channel FOR MORE CLASSES VISIT www.ecet380rank.com Simulation of a Rayleigh Channel Summary (two sentences): Simulated and analyzed the effects of flat fading Rayleigh channels on transmitted signals. Simulated and analyzed the effects of frequency selective Rayleigh channels on transmitted signals. The radio channel that links the transmitter and receiver in wireless communications applications can be a hostile and complicated medium. Characteristics of the channel may lead to security breaches, limit the application’s throughput, or severely degrade signal quality if the system is not properly designed. The causes of these deficiencies are primarily due to two factors: Doppler Shift, which is caused by motions of the mobile device or objects in the radio channel, and Multipath Fading, which results from scattering of the transmitted electromagnetic waves. The radio channel is usually

3. characterized as one in which its statistics are modeled as Rayleigh or Rician distributions. Open MATLAB and familiarize yourself with the Default Layout, which includes the Current Directory, Command History, and Command Window. You will be working The Command Window is a command line environment, much like DOS or UNIX. You will type all commands in this lab at the >> prompt. Following each command, you will need to hit the Enter key. Also, if you are working in the Citrix To get started, type in: >> 1. Scroll UP until the commcomm. Select this entry. 2. Scroll UP again, and select rayleighchanunder the Channels main topic. Explore this section, along with doc rayleighchanto familiarize yourself with the function. 3.What information is available? Summarize each property & parameter. Identify Read-Only (R) and Writable (W) properties. 4. At the prompts, type in the following (press Enter after each line): 5. What non-zero parameters of the channel are displayed? Record their values. 6. Why is PathDelays = 0? Only one Path B. Generate and Plot Rayleigh Channel Power 1. Take a screen shot that shows your plot to include with your lab report submission. =========================================== === ECET 380 Week 3 iLab Antenna Design FOR MORE CLASSES VISIT www.ecet380rank.com Antenna Design Key Conclusions (technical): Key Conclusions (critical thinking): I. OBJECTIVES 1. Introduction to the most

4. commonly used antenna types and significant design parameters 2. Design an antenna suitable for a 2G, 3G or 4G wireless application deployment. II. PARTS LIST N/A III.INTRODUCTION In this lab exercise you will design an antenna suitable for a 2G, 3G or 4G wireless application deployment. Such applications include 3G cellular (e.g. CDMA2000 evolutions), IEEE 802.11x, IEEE 802.16 and Bluetooth. The antenna should be deployable at a cellular base station, cellular mobile unit, Bluetooth unit, a wireless LAN access point or portable unit. IEEE 802.16 base station or portable device applications can also be implemented. IV. PROCEDURE A. Resources Well known classical antenna design procedures for various antenna types are available from Internet resources and texts such as The ARRL Antenna Book. Consult these resources as you proceed with your design as this will not only expedite the process but assure that your chosen design parameters meet with FCC specifications. Refer to the FCC Part 15 documentation and other applicable documents to make sure your design parameters meet the FCC stipulated limits. The parameters of primary interest include: Operating Frequency, Directivity, Radiation Pattern, and Gain. For any application for which you choose to design, investigate the parameters as stipulated by the FCC. You must include these applicable parameters in your report. B. Antenna Choice Work with your instructor to choose an antenna to design so that the class develops a variety of solutions. Your report must support your choice of antenna, that is, you must give the reasons why a particular antenna type was chosen. For example, for a cell phone, the antenna dimension, aesthetic beauty, and omni-directivity may be the most important factors influencing your design choice. However, for an antenna to be deployed at a cellular base station, features such as directivity, wide operating bandwidth and capability to radiate signals of relatively high power may be the primary factors around which your design is centered. As you can see, you need to consider technical aspects along with practicality when designing your antenna. The following table should help in understanding your choice.

5. =========================================== === ECET 380 Week 4 iLab Pulse Shaping Filters FOR MORE CLASSES VISIT www.ecet380rank.com Title of Report: Pulse Shaping Filters I. We used MATLAB to designed pulse shaping filters and investigated the filters’ Impulse Responses as key filter parameters are varied OBJECTIVES 1. Use MATLAB to design pulse shaping filters. 2. Investigate the filters’ Impulse Responses as key filter parameters are varied. 3. Observe the effect of Matched Filtering on Inter-symbol Interference (ISI). II. PARTS LIST Equipment: IBM PC or Compatible with Windows 2000 or Higher Software: MATLAB Version 7.1 or Higher III. INTRODUCTION Baseband signal processing is an important component of any modern wireless system. Line Coding, Channel Coding, Encryption, Compression and Pulse Shaping are all schemes deployed at this level. Spectral scarcity is always a key consideration for the wireless designer. Inter-symbol Interference and other degrading effects of a typical radio channel are also issues that need to be addressed during system design. In this lab we shall examine the roles of pulse shaping filters as a means of achieving spectral efficiency and ISI mitigation. The two pulse shaping filters we shall work with include the Gaussian and the Raised Cosine filters. IV. PROCEDURE A. Applicable MATLAB Tools 1. Open MATLAB and familiarize yourself with the Default Layout, which includes the Current Directory, Command History and Command Window. You will be working

6. primarily in the Command Window, but the other windows may provide useful information in the future. 2. The Command Window is a command line environment, much like DOS or UNIX. You will type all commands in this lab at the >> prompt. Following each command, you will need to hit the Enter key. Also, if you are working in the Citrix environment, there may be a lag in MATLAB’s response. Some operations are VERY processor intensive – just be patient. 3. To get started, type in: >>help 4. Scroll UP until the commcomm. Select this entry. 5. Scroll UP again, and look for the 3 categories that contain filter options. List these sections, their subcategories and descriptions of each. =========================================== === ECET 380 Week 5 iLab Code Division Multiple Access A 3G Cellular Multiple Access Scheme FOR MORE CLASSES VISIT www.ecet380rank.com Code Division Multiple Access A 3G Cellular Multiple Access Scheme I. OBJECTIVES 1. Use the TIMS modeling system to generate a CDMA signal. 2. Detect the messages transmitted in the CDMA signal in a noiseless channel. 3. Add degradation in the form of noise to a CDMA signal. 4. Study the effects of noise on a CDMA signal. II. PARTS LIST Equipment: IBM PC or Compatible with Windows 2000 or Higher Software: TutorTIMS – Version 2.0 Advanced The following TIMS modules will be required for the lab. Read about the

7. modules required for the particular lab section before proceeding: 1. Sequence Generator 2. Multiple Sequence Source 3. Master Signals 4. Adder 5. Digital Utilities 6. Quadrature Utilities 7. Noise Generator 8. CDMA Decoder 9. Error Counting Utilities (Error Counter) 10.Phase Shifter III. INTRODUCTION The scarcity of the available spectrum and the explosive growth in the popularity of wireless communications devices absolutely imposes the need for the sharing of the available bandwidth among wireless applications subscribers. A number of multiple access schemes exist to meet this demand, each with its own merits and demerits, including: • FDMA - Frequency Division Multiple Access: Deployed in the now mostly outdated 1G standards, this scheme was highly bandwidth inefficient. • TDMA - Time Division Multiple Access: More spectrally efficient than FDMA and still in operation in 2G standards such as GSM, which is still widely deployed in many countries around the world. TDMA is also the multiple access scheme of choice for most of the wireless data-centric standards. •CDMA - Code Division Multiple Access: This is the access scheme of choice for 3G and other evolving standards such as CDMA 2000 and W-CDMA. This scheme, when combined with spread spectrum, imparts certain advantages, as we shall observe in this lab. It should be noted that the combination of the multiple access scheme and the duplexing method (TDD, FDD) used in an application is known the “air interface” method for that particular application. CDMA In the CDMA scheme, each subscriber is assigned a unique code which is as different from that assigned to all other subscribers as possible. This setup allows the subscribers to use the same allotted spectrum, say in a particular cellular communications cell, with minimal interference to one another. In the CDMA scheme, there is no need to divide the spectrum into tiny bands, as in FDMA, and subscribers do not have to take turns occupying a relatively large available bandwidth, as in TDMA. This means that in CDMA applications, a relatively large bandwidth is occupied all of the time when allotted to a subscriber. One can thus see why CDMA is the scheme of choice for the 3G and beyond cellular standards. Little frequency planning is needed. It also has a large occupied bandwidth,

8. without the latency issues that arise from time division sharing. This all leads to the possibility of supporting very high data rates, when combined with other PHY layer schemes such as modulation and compression. In addition, the technique of spread spectrum, which is bandwidth driven, can be exploited. This helps mitigate channel- imposed degradations, such as multipath fading. Table 1 shows CDMA deployment in 2G and beyond cellular standards with 2G GSM shown for comparison: =========================================== === ECET 380 Week 6 iLabIntroduction to OFDM Generation FOR MORE CLASSES VISIT www.ecet380rank.com Introduction to OFDM Generation I. OBJECTIVES 1. Introduce the student to the underlying theory of operation of Orthogonal Frequency Division Multiplexing (OFDM). 2. Learn to use TIMS modules to implement an OFDM generator scheme. 3. Generate and analyze OFDM waveforms. II. PARTS LIST Equipment: IBM PC or Compatible with Windows 2000 or Higher Software: TutorTIMS – Version 2.0 Advanced The following TIMS modules will be required for the lab. Read about the modules required for the particular lab section before proceeding: 1. Sequence Generator 2. Multiplier 3. M- Level Encoder 4. Phase Shifter 5. Master Signals 6. Adder 7. Tunable LPF 8. 100 KHz Channel Filters 9. Decision Maker III. INTRODUCTION OFDM (Orthogonal Frequency Division

9. Multiplexing) is a combination of modulation and multiplexing, and more specifically, is a special case of Frequency Division Multiplexing (FDM), as the name implies. A single main data stream is split into many lower rate data streams (multiplexing). Each of these streams is then individually modulated onto a separate sub-carrier (modulation) and finally recombined into a single composite OFDM signal to be transmitted. The addition of a cyclic prefix is also an important part of OFDM, however, this feature will be discussed but not implemented in this introductory experiment. The coding blocks will not be covered in detail within this experiment. =========================================== === ECET 380 Week 7 iLab Frequency Shift Keying A Bluetooth Modulation Lab FOR MORE CLASSES VISIT www.ecet380rank.com Summary (two sentences) (2pts): The purpose of this lab was to use Tutor TIMS to implement and learn about Orthogonal Frequency Division Multiplexing(OFDM). In addidion, Tutor TIMS was used to generate an OFDM signal. I.OBJECTIVES Introduce the student to the underlying theory of operation of Orthogonal Frequency Division Multiplexing (OFDM). Learn to use TIMS modules to implement an OFDM generator scheme. Generate and analyze OFDM waveforms. II. PARTS LIST Equipment: IBM PC or Compatible with Windows 2000 or Higher Software: TutorTIMS – Version 2.0 Advanced The following

10. TIMS modules will be required for the lab. Read about the modules required for the particular lab section before proceeding: 1.Sequence Generator 2.Multiplier 3.M-Level Encoder 4.Phase Shifter 5.Master Signals 6.Adder 7.Tunable LPF 8.100 KHz Channel Filters 9.Decision Maker III.INTRODUCTION OFDM (Orthogonal Frequency Division Multiplexing) is a combination of modulation and multiplexing, and more specifically, is a special case of Frequency Division Multiplexing (FDM), as the name implies. A single main data stream is split into many lower rate data streams (multiplexing). Each of these streams is then individually modulated onto a separate sub-carrier (modulation) and finally recombined into a single composite OFDM signal to be transmitted. The addition of a cyclic prefix is also an important part of OFDM, however, this feature will be discussed but not implemented in this introductory experiment. The coding blocks will not be covered in detail within this experiment. =========================================== ===

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