Laws Wireless Communication Interview Questions And Answers Pdf


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+ Wireless Communication Interview Questions and Answers, Question1: How frequency hopping is used for security in Bluetooth? Question2: Why is. ece Interview questions on wireless communication concept and Answer 1. concepts in Pdf Wireless Communication Concepts PDF. Short Questions & Answers on Mobile Communication. Subject Code-PEEC . SEM-6 th. SEC- ETC. Prepared by-Mr. M. R. Jena, Asst. Prof., Dept. of ETC. 1.

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Related Searches to Wirless Communication Interview Questions and Answers: wireless communication interview questions wireless communication interview. Wireless communication interview questions & answers with explanation on topics like Bluetooth, 3G, CDMA, LTE, GSM/GPRS, WiFi, WiFAX, FMC, Wireless. Essential Wireless Communication Interview Questions & Answers: The data transmitting on one frequency for a specific time limit and jumping randomly to another and transmitting again is the process in FHSS. Download Interview PDF.

What is a base station? How many satellites are required to cover the earth? The life span of the satellite is about 15 years. What is a repeater?

What is attenuation? Attenuation is the reduction in amplitude and intensity of a signal.

Signals may attenuate exponentially by transmission through a medium, or by increments calculated in electronic circuitry or set by variable controls.

Attenuation is an important property in telecommunications and ultrasound applications because of its importance in determining signal strength as a function of distance.

What is multiplexing? Multiplexing known as muxing is a term used to refer to a processwhere multiple analog message signals or digital data streams are combined into one signal over a shared medium. The aim is to share an expensive resource. For example, in telecommunications, several phone calls may be transferred using one wire. Code division multiple access CDMA is a channel access methodutilized by various radio communication technologies.

Wireless Communication interview questions

CDMA employsspread-spectrum technology and a special coding scheme where each transmitter is assigned a code to allow multiple users to be multiplexed over the same physical channel.

An analogy to the problem of multiple access is a room channel in which people wish to communicate with each other. To avoid confusion, people could take turns speaking time division , speak at different pitches frequency division , or speak in different directions spatial division. In CDMA, they would speak different languages.

People speaking the same language can understand each other, but not other people.

Wireless Communication Interview Questions

Similarly, in radio CDMA, each group of users is given a shared code. Many codes occupy the same channel, but only users associated with a particular code can understand each other. These are the two different means of mobile communication being presently used worldwide. The basic difference lies in the Multiplexing method used in the aerial communication i. CDMA uses Code Division Multiple Access as the name itself indicates, for example you are in a hall occupied with number of people speaking different language.

You will find that the one language you know will be heard by you and the others will be treated like noise. TDMA works by dividing a radio frequency into time slots and then allocating slots to multiple calls. In this way, a single frequency can support multiple, simultaneous data channels. What is an Amplifier?

An electronic device or electrical circuit that is used to boost amplify the power, voltage or current of an applied signal. What is Barkhausen criteria? Barkhausen criteria, without which you will not know which conditions, are to be satisfied for oscillations. Explain Full duplex and half duplex.

Full duplex refers to the transmission of data in two directions simultaneously. For example, a telephone is a full-duplex devicebecause both parties can talk at once.

In contrast, a walkie-talkie is ahalf-duplex device because only one party can transmit at a time.

Most modems have a switch that lets you choose between full-duplex and half-duplex modes. The choice depends on whichcommunications program you are running.

In full-duplex mode, data you transmit does not appear on yourscreen until it has been received and sent back by the other party. This enables you to validate that the data has been accurately transmitted.

If your display screen shows two of each character, it probably means that your modem is set to half-duplex mode when it should be in full-duplex mode.

What is a feedback? And explain different types of feedback. Feedback is a process whereby some proportion of the output signal of a system is passed fed back to the input. This is often used to control the dynamic behaviour of the system.

Types of feedback: Negative feedback: This tends to reduce output but in amplifiers, stabilizes and linearizes operation. Positive feedback: This tends to increase output.

Wireless Communication Interview Questions & Answers

In contrast, a system that responds to the perturbation in the opposite direction is called a negative feedback system. Bipolar feedback: which can either increase or decrease output. Advantages of negative feedback over positive feedback. Much attention has been given by researchers to negative feedback processes, because negative feedback processes lead systems towards equilibrium states.

Wirless Communication Interview Questions And Answers

Positive feedback reinforces a given tendency of a system and can lead a system away from equilibrium states, possibly causing quite unexpected results. Example for negative feedback and positive feedback. What is Oscillator?

An oscillator is a circuit that creates a waveform output from a direct current input. The two main types of oscillator are harmonic and relaxation. The harmonic oscillators have smooth curved waveforms, while relaxation oscillators have waveforms with sharp changes. What is a transducer and transponder?

A transducer is a device, usually electrical, electronic, electro-mechanical, electromagnetic, photonic, or photovoltaic that converts one type of energy or physical attribute to another for various purposes including measurement or information transfer. An automatic device that transmits a predetermined messagein response to a predefined received signal. A receiver-transmitter that will generate a reply signal upon proper electronic interrogation.

Second generation 2G cellular telecom networks were commercially launched on the GSM standard in Finland in Three primary benefits of 2G networks over their predecessors were that phone conversations were digitally encrypted 2G systems were significantly more efficient on the spectrum allowing for far greater mobile phone penetration levels and 2G introduced data services for mobile starting with SMS text messages.

It is a successor to 3G and 2G standards. The nomenclature of the generations generally refers to a change in the fundamental nature of the service. The first was the move from analogue 1G to digital 2G transmission. It is a project of the 3rd Generation Partnership Project 3GPP operating under a named trademarked by one of the associations within the partnership the European Telecommunications Standards Institute.

It uses multiplexing techniques including code division multiple access CDMA as well as time division multiple access TDMA to maximize both individual users throughput and the overall system throughput. What is Voluntary Tunnel? The user creates a voluntary tunnel model. This model is typically uses a L2TP enabled client. The L2TP tunnel initiator resides on the same system effectively playing as a remote client. Confidentiality or encryption does not provided by PPTP.

The reliability of PPTP is being tunneled for the purpose of providing privacy. Because of its easy way of configuration, it is most popular protocol used in VPNs.If the message still cannot be detected, the mobile unit switches to block B and scans to block B set-up channels. The decrease in the number of cell sites which results from implementation of the multiple K systems is shown in Fig. Capacitors are occasionally referred to as condensers.

It was founded as the International Telegraph Union in Paris on 17 May and is today the leading United Nations agency for information and communication technology issues and the global focal point for governments and the private sector in developing networks and services. Rishi Jha. Published on May 2, Why not share!

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