Skip to main content
Home Wireless Communication Modulation MATLAB Beamforming Project Ideas MIMO Computer Networks Lab 🚀

Wireless Communication Interview Questions | Page 4


 

Data communication

Q. Criteria for cable selection for data transmission

A. The bandwidth of various cables, such as coaxial, twisted, and so on, varies. As a result, we select cables based on their bandwidth.

Q. 2.4g WIFI doesn't work on dual broadband router whereas 5g network works fine

A. 5 GHz WiFi frequency provides more bandwidth and channels to users.

Wireless protocol used to communicate for a short distance

What will be the baud rate of a communication channel that can transfer 20 symbols in 5 seconds?

Wireless channels are more prone to bit error than wired channels

What are the essential elements of linear array detector signal processing, and what are their functions?

Is QAM the best choice for efficient bandwidth?

A. Bandwidth of QAM = 1*R baud, where R = number of symbols per second


Frequency bands

What is shf frequency range?

A. 3-30 GHz

What is the UWB frequency range

A. 3 - 10 GHz

read more about frequency bands ...


5G

How 5g achieve higher reliability than 4g

Is MI 10 compatible with both 4g and 5g?

Does this Sony 43x8000h model support which network, 4g or 5g?

The best internet-antenna spacing for BSA(broadside array is


Internet

Some point against the excessive use of the Internet

Advantages and disadvantages of the Internet on quick and verified information


Antenna

I have a 2 antenna modem. How would I come to know that both antennas are working

0 db high band antenna length

What are the electronic components required to make single-wave antennae?

antennas for long-range communication


Computer Network

The data plane in the network model is responsible for

Write the necessary needs of computer network

lab manual for computer servicing and networking lab Polytechnic College

Why do protocols in the computer system need to communicate with interconnected networks?

A. See answer


Internet of things

Without any human intervention, the large number of devices connected to the IOT to exchange information is called.

M2m IOT architecture comprises of

IoT project ideas that can create a better society


Technology

How the technology has improved to send messages?


Bluetooth

Do wireless transmitter-receivers also have Bluetooth options?


Backhaul

How many companies have developed multi-beam backhaul or point-to-multipoint wireless products in E band frequency?


Mobile Phone

How are landlines and mobile devices connected to local telephone exchange using wired and wireless communication?


Telemetry

Future scope of wireless telemetry

Wired and wireless telemetry system


MIMO

What is the future scope of spectral efficiency improvement in UL massive MIMO using space-time block. Coding?

What is the use of management protection cable in the MIMO link?


3G

Can a 3g device be connected with 5g Internet?



What are the baud rate, bit rate, sampling rate, and their differences?

What are Nyquist criteria?

 What is Aliasing


What are the differences between FIR and IIR filters

A. See answer


What is a raised cosine filter?




People are good at skipping over material they already know!

View Related Topics to







Admin & Author: Salim

profile

  Website: www.salimwireless.com
  Interests: Signal Processing, Telecommunication, 5G Technology, Present & Future Wireless Technologies, Digital Signal Processing, Computer Networks, Millimeter Wave Band Channel, Web Development
  Seeking an opportunity in the Teaching or Electronics & Telecommunication domains.
  Possess M.Tech in Electronic Communication Systems.


Contact Us

Name

Email *

Message *

Popular Posts

Star to Delta Conversion and Vice Versa | star delta conversion

The transformation of a star to a delta and a delta to a star circuit is a hot topic in electrical science and engineering. Examiners often ask about the conversion of star to delta and delta to star circuit diagram. When solving complex circuits, the conversion procedure can sometimes ease calculations and save time. Without further ado, we'll go over the characteristics of both a star and a delta circuit. As its title suggests, the star circuit looks like a star. Delta circuit, on the other hand, looks like a delta. Now we'll look at the mathematical method for converting delta to star and star to delta. Delta to Star R1 = RaRb / (Ra + Rb + Rc) R2 = RbRc / (Ra + Rb + Rc) R3 = RaRc / (Ra + Rb + Rc) Use star to delta online converter and vice versa Star to Delta Ra = (R1R2 + R2R3 + R3R1) / R2 Rb = (R1R2 + R2R3 + R3R1) / R3 Rc = (R1R2 + R2R3 + R3R1) / R1 Next Page>>

MATLAB Code for Rank and Condition Number of a Channel Matrix

To assess the signal strengths of various multipaths between TX and RX and enable communication, the rank and condition numbers of a channel matrix are highly helpful characteristics. Signal multipath propagation is a typical occurrence in wireless communication. Phases shift and the signal weakens during this process. We are discussing signal phases in this context. When numerous multipaths arrive at the receiver, the resulting signal may be additive or destructive because of phase alterations. A channel matrix is referred to as a sparse matrix if it only has a few stronger elements and the majority of the other elements are zero. Finding rank and condition number for sparse matrices is important for numerous reasons. That topic has already been covered in another article [ click here ]. We will just talk about the corresponding MATLAB codes here. MATLAB Code for Rank and Condition Number of a Channel Matrix %Author: Salim Wireless For study materials on wireless %com...

Simulation of ASK, FSK, and PSK using MATLAB Simulink

ASK, FSK & PSK HomePage MATLAB Simulation Simulation of Amplitude Shift Keying (ASK) using MATLAB Simulink      In Simulink, we pick different components/elements from MATLAB Simulink Library. Then we connect the components and perform a particular operation.  Result A sine wave source, a pulse generator, a product block, a mux, and a scope are shown in the diagram above. The pulse generator generates the '1' and '0' bit sequences. Sine wave sources produce a specific amplitude and frequency. The scope displays the modulated signal as well as the original bit sequence created by the pulse generator. Mux is a tool for displaying both modulated and unmodulated signals at the same time. The result section shows that binary '1' is modulated by a certain sine wave amplitude of 1 Volt, and binary '0' is modulated by zero amplitude. Simulation of Frequency Shift Keying (FSK) using MATLAB Simulink   Result The diagram above shows t...

MATLAB Code for QAM (Quadrature Amplitude Modulation)

  One of the best-performing modulation techniques is QAM [↗] . Here, we modulate the symbols by varying the carrier signal's amplitude and phase in response to the variation in the message signal (or voltage variation). So, we may say that QAM is a combination of phase and amplitude modulation. Additionally, it performs better than ASK or PSK [↗] . In fact, any constellation for any type of modulation, signal set (or, symbols) is structured in a way that prevents them from interacting further by being distinct by phase, amplitude, or frequency. MATLAB Script % This code is written by SalimWirelss.Com % This is an example of 4-QAM. Here constellation size is 4 % or total number of symbols/signals is 4 % We need 2 bits once to represent four constellation points % QAM modulation is the combination of Amplitude modulation plus % Phase Modulation. We map the decimal value of the input symbols, i.e., % 00, 01, 10, 11 to 1 + 1i, -1 + 1i, 1 - 1i, and -1 - 1i, respectively. clc;clear all;...

MIMO, massive MIMO, and Beamforming

  The term 'MIMO' was originally applied to systems with multiple antennas on both the transmitter (Tx) and receiver (Rx) sides. MIMO is a key component of Wi-Fi 4 and 5, 3G, and 4G cellular networks. This method was introduced to increase the capacity of a channel by sending multiple simultaneous data streams through a single channel. All simultaneous data streams in a MIMO system are encoded orthogonally multiplexed, which reduces interference. Massive MIMO is used extensively in 5G to achieve extremely high capacity and to communicate via  beamforming  or directional transmission. 1. Some essential characteristics of a MIMO system 1.1. Spatial Division Multiplexing Access (SDMA) SDMA is a key feature of MIMO, allowing a base station (BS) to communicate with several devices simultaneously (or even using the same frequency) if they are in different locations. There may be no knowledge of channel information at the transmitter. 1.2. Spatial Multiplexing Another essential ...

BER vs SNR for M-ary QAM, M-ary PSK, QPSK, BPSK, ...

Modulation Constellation Diagrams BER vs. SNR BER vs SNR for M-QAM, M-PSK, QPSk, BPSK, ... 1. What is Bit Error Rate (BER)? The abbreviation BER stands for bit error rate, which indicates how many corrupted bits are received (after the demodulation process) compared to the total number of bits sent in a communication process. It is defined as,  In mathematics, BER = (number of bits received in error / total number of transmitted bits)  On the other hand, SNR refers to the signal-to-noise power ratio. For ease of calculation, we commonly convert it to dB or decibels.   2. What is Signal the signal-to-noise ratio (SNR)? SNR = signal power/noise power (SNR is a ratio of signal power to noise power) SNR (in dB) = 10*log(signal power / noise power) [base 10] For instance, the SNR for a given communication system is 3dB. So, SNR (in ratio) = 10^{SNR (in dB) / 10} = 2 Therefore, in this instance,...

Why do we require modulation in wireless communication?

Modulation : Why do we require modulation in wireless communication? Wireless communication relies heavily on modulation techniques. Coaxial cable, twisted pair, and other types of wired communication are commonly used. Wired communication, on the other hand, is best for short-distance communication. An antenna is required for wireless communication to transfer signals. Now, if we want to send a baseband signal, we'll need a very large antenna with a range of many kilometers. Baseband signals are ones that typically contain a low or medium frequency message signal. It's also known as a message signal without modulation. Modulation is a technique for increasing the frequency of a message signal by the carrier frequency to a significantly higher frequency. So, now I'll explain why modulation is necessary. The main two goals of modulation techniques are to reduce antenna height and to multiplex data (Multiplexing). Reducing the height of antenna: For short-range baseband commu...