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Ericsson RF Engineer Interview Questions, Process, and Tips
Top Ericsson RF Engineer Interview Questions and Answers
- Q1. Wahi is the 4G parameters in kpi.
- Q2. What is difference between coupler and tapper?
- Q3. HOW YOU CAN IMPROVE CQI
Ericsson RF Engineer Interview Experiences
6 interviews found
Anonymous
(2 Questions)
- Q1. Parameter & Lte question
- Q2. RF KPI & Drop Call
(2 Questions)
- Q1. What is NR Technology?
- Ans.
NR Technology stands for New Radio Technology, which is the global standard for a unified, more capable 5G wireless air interface.
NR Technology is the foundation of 5G wireless communication systems.
It provides higher data rates, lower latency, and increased reliability compared to previous generations.
NR Technology operates in both sub-6 GHz and mmWave frequency bands.
It enables new use cases such as IoT, smart cities
- Q2. What is difference between coupler and tapper?
- Ans.
A coupler is a device used to split or combine RF signals, while a tapper is used to attenuate a portion of the signal.
Coupler splits or combines RF signals, while tapper attenuates a portion of the signal
Coupler has multiple ports for signal input/output, tapper typically has one input and two outputs
Coupler has a fixed coupling ratio, tapper allows for adjustable attenuation levels
Kaushal Kumar Singh
(1 Question)
- Q1. LTE call flow and kpi
sushil
Selected
I applied via Referral and was interviewed in Aug 2022. There were 4 interview rounds.
Aptitude test of 1 hour, 3 sections, sectional cut off, aptitude test, resoning, English
(3 Questions)
- Q1. Technical questions regarding LTE and 5G Kpi Optimization
- Q2. HOW YOU MITIGATE UL RSSI IN TDD ,DUCTING EFFECT ,TOOLS ON WHICH I AM WORKING
- Ans. FRAME STRUCTURE CHANGE SSF7 TO SSF5 AND Aggressive TILTING OF AGRRESOR WILL HELP
- Q3. HOW YOU CAN IMPROVE CQI
- Ans.
CQI can be improved by optimizing modulation schemes, increasing bandwidth, and reducing interference.
Optimize modulation schemes to increase data throughput
Increase bandwidth to allow for more data transmission
Reduce interference by using advanced signal processing techniques
Implement MIMO technology to improve signal quality
Use adaptive modulation and coding to adjust to changing channel conditions
(1 Question)
- Q1. What is my Salary expectations
- Ans.
My salary expectations for the RF Engineer position are competitive and commensurate with my experience and qualifications.
Research the average salary range for RF Engineers in your location and industry.
Consider your level of experience, education, and any specialized skills or certifications.
Factor in the company's size, reputation, and benefits package.
Be prepared to negotiate and discuss your salary expectations du...
Interview Preparation Tips
Ericsson interview questions for designations
I applied via Recruitment Consulltant and was interviewed in Jul 2022. There were 2 interview rounds.
(3 Questions)
- Q1. All things considered about me
- Q2. Take all information about my job responsibilities
- Q3. Take all information my carrier
Interview Preparation Tips
Interview Questionnaire
2 Questions
- Q1. Wahi is the 4G parameters in kpi.
- Ans.
4G parameters in KPI are key performance indicators that measure the performance of a 4G network.
4G parameters in KPI include metrics such as signal strength, signal quality, throughput, latency, and handover success rate.
These parameters help assess the overall performance and quality of a 4G network.
For example, signal strength is measured in dBm and indicates the power level of the received signal.
Throughput measure...
- Q2. What is SINR.
- Ans.
SINR stands for Signal-to-Interference-plus-Noise Ratio, a measure of signal quality in wireless communication.
SINR is a ratio of the desired signal power to the interference and noise power.
It is used to evaluate the quality of a wireless signal in a given environment.
Higher SINR values indicate better signal quality and stronger signal-to-noise ratio.
SINR is commonly used in cellular networks to optimize network perf
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Interview Questionnaire
12 Questions
- Q1. LTE Architecture
- Q2. Interface between LTE
- Ans.
Interface between LTE refers to the connection between the LTE network and other networks or devices.
LTE interfaces with other cellular networks such as 3G and 2G through inter-RAT handover
LTE also interfaces with non-cellular networks such as Wi-Fi and Ethernet through evolved packet core (EPC)
LTE devices interface with the LTE network through the air interface using radio frequency signals
LTE also interfaces with cor...
- Q3. What is X2 interface
- Ans.
X2 interface is a communication interface between two eNodeBs in LTE network.
X2 interface is used for inter-cell handover and load balancing.
It is a point-to-point interface that connects two eNodeBs.
X2 interface is used for exchanging control and user plane data between eNodeBs.
It is a critical interface for LTE network performance and reliability.
X2 interface supports various protocols such as S1AP, GTP, and RANAP.
- Q4. Channels of LTE
- Ans.
LTE has 20 MHz bandwidth divided into 100 resource blocks. Each resource block has 12 subcarriers and 7 symbols.
LTE has 20 MHz bandwidth
Divided into 100 resource blocks
Each resource block has 12 subcarriers and 7 symbols
- Q5. KPI of LTE
- Ans.
KPIs (Key Performance Indicators) of LTE include throughput, latency, coverage, and call setup success rate.
Throughput measures the amount of data that can be transmitted over the network in a given time period.
Latency measures the time it takes for data to travel from the source to the destination.
Coverage measures the area where the network signal is available.
Call setup success rate measures the percentage of succes...
- Q6. What is CSFB?
- Ans.
CSFB stands for Circuit Switched Fallback, a technology that allows LTE devices to fallback to 2G or 3G networks for voice calls.
CSFB is used when a LTE device is unable to make a voice call over the LTE network.
It allows the device to switch to a 2G or 3G network for voice calls.
CSFB is a temporary solution until VoLTE (Voice over LTE) becomes more widely available.
CSFB can cause call setup delays and impact the user
- Q7. Why OFDMA technique used in LTE?
- Ans.
OFDMA is used in LTE to improve spectral efficiency and support multiple users simultaneously.
OFDMA allows for multiple users to share the same frequency band by dividing it into smaller subcarriers.
It also enables dynamic allocation of subcarriers to users based on their bandwidth requirements.
This results in better spectral efficiency and higher data rates.
OFDMA is also resistant to interference and fading, making it...
- Q8. Differentiate FDD & TDD
- Ans.
FDD and TDD are two different duplexing techniques used in wireless communication.
FDD stands for Frequency Division Duplexing and TDD stands for Time Division Duplexing.
In FDD, separate frequency bands are used for uplink and downlink communication, while in TDD, the same frequency band is used for both uplink and downlink communication.
FDD is used in technologies like 2G, 3G, and 4G LTE, while TDD is used in technolog...
- Q9. What is massive MIMO?
- Ans.
Massive MIMO stands for Massive Multiple Input Multiple Output. It is a wireless communication technology that uses a large number of antennas at the base station to improve network performance.
Massive MIMO uses a large number of antennas at the base station to improve network performance.
It can significantly increase the capacity and coverage of wireless networks.
It works by using spatial multiplexing to transmit mult...
- Q10. LTE Channels
- Q11. LTE Call Flow
- Q12. Type of Handover & its process
- Ans.
Handover is the process of transferring an ongoing call or data session from one cell to another.
There are two types of handover: Hard Handover and Soft Handover.
Hard Handover involves breaking the connection with the current cell before establishing a connection with the new cell.
Soft Handover involves establishing a connection with the new cell before breaking the connection with the current cell.
The handover process...
Skills evaluated in this interview
Ellie Riahi
(2 Questions)
- Q1. Why nokia and why this job
- Ans.
Nokia is a global leader in telecommunications technology and I am passionate about RF engineering, making this job a perfect fit for me.
Nokia is a renowned company with a strong reputation in the telecommunications industry
I have a deep interest in RF engineering and Nokia offers opportunities to work on cutting-edge technologies in this field
The company's commitment to innovation and continuous learning aligns with m
- Q2. Some basic fundamental questions from theory
I applied via Referral and was interviewed in Dec 2023. There were 3 interview rounds.
(1 Question)
- Q1. What is modulation, and what are the different types of modulation schemes.
- Ans.
Modulation is the process of varying a carrier signal to transmit information. Different types include AM, FM, PM, and QAM.
Modulation is used to transfer information by varying a high-frequency carrier signal.
Amplitude Modulation (AM) varies the amplitude of the carrier signal to encode information.
Frequency Modulation (FM) varies the frequency of the carrier signal to encode information.
Phase Modulation (PM) varies th...
(3 Questions)
- Q1. What is S-matrix?
- Ans.
S-matrix is a mathematical representation used in RF engineering to describe the relationship between input and output signals of a linear system.
S-matrix is also known as scattering matrix.
It is used to analyze the behavior of RF circuits and systems.
S-matrix elements represent the complex amplitudes of the incident and reflected waves at each port of a network.
S11 parameter represents the reflection coefficient at po...
- Q2. Where can you different types analog modulation schemes?
- Ans.
Different types of analog modulation schemes can be found in various communication systems.
Analog modulation schemes are used in radio broadcasting, television transmission, and wireless communication.
Some common types of analog modulation schemes include amplitude modulation (AM), frequency modulation (FM), and phase modulation (PM).
AM is used in AM radio broadcasting, where the amplitude of the carrier signal is vari...
- Q3. What is VSWR and what is the need for it?
- Ans.
VSWR stands for Voltage Standing Wave Ratio. It is a measure of how well a transmission line is matched to the impedance of the connected devices.
VSWR is a ratio of the maximum voltage to the minimum voltage along a transmission line.
It is used to measure the efficiency of power transfer and the impedance matching in RF systems.
A lower VSWR indicates better impedance matching and less power loss.
VSWR is important in RF...
(4 Questions)
- Q1. What is a standing wave in a transmission line?
- Ans.
A standing wave in a transmission line is a wave that appears to be stationary, resulting from the interference of two waves traveling in opposite directions.
A standing wave is formed when a wave traveling in one direction reflects back upon encountering an impedance mismatch in the transmission line.
The interference between the incident and reflected waves creates regions of constructive and destructive interference, ...
- Q2. Draw waveforms of Amplitude and FM/PM modulation scheme?
- Ans.
Amplitude modulation (AM) and frequency modulation (FM) waveforms can be represented graphically.
AM modulation: The amplitude of the carrier signal is varied in proportion to the amplitude of the modulating signal.
FM modulation: The frequency of the carrier signal is varied in proportion to the amplitude of the modulating signal.
Waveforms can be drawn to show the variations in amplitude or frequency over time.
AM wavefo...
- Q3. What is the propagation delay in Electromagnetic wave?
- Ans.
Propagation delay is the time it takes for an electromagnetic wave to travel from one point to another.
Propagation delay is determined by the distance between the two points and the speed of light.
It is the time it takes for the wave to propagate through a medium or free space.
Propagation delay can be calculated using the formula: delay = distance / speed of light.
For example, if the distance between two points is 100 ...
- Q4. Draw Transmitter and Receiver for a communication system.
- Ans.
A transmitter and receiver are essential components of a communication system.
Transmitter converts information into a suitable form for transmission.
Receiver receives the transmitted signal and converts it back into the original form.
Transmitter typically includes a modulator, power amplifier, and antenna.
Receiver typically includes an antenna, demodulator, and audio or video output.
Example: In a radio communication sy...
Interview Preparation Tips
- Communication Systems
- Transmission Line
- Signals and Systems
First Round was to judge engineering aptitude, i was asked general things and about my project. The interviewer was was very nice and friendly. A good experience overall.
Second round was a technical round questions from my projects and subjects like EMT and Communication systems was asked in great details. Friendly Interviewer, even though it was an interview I learnt a great deal. Again a very good experience.
Third Round was manager round. Again a technical round. Question asked from EMT and communication systems. The interviewer was not friendly at all, I felt like I was sitting in a college viva. The interviewer started every question with "Do you have any Idea about--" which I felt was berating and rude at least. While explaining things the interviewer interrupted me again and again and kept asking questions related to it which intimidated me. In the previous rounds of interview if I answered incorrectly or partially correctly the interviewer would ask me to rethink and give me sometime for the same. Here the interviewer would answer with "hmmm" again and again and move to the next question. Overall questions asked were from complete basics but I didn't have a good interview experience at all.
Reading previous interview experience for freshers, I was told I'd be asked for my preferred subject but that was not the case so an interviewee should be prepared for the worst.
(1 Question)
- Q1. Based on resume
(1 Question)
- Q1. About projects in resume
(1 Question)
- Q1. General questions on background
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Ericsson RF Engineer Interview Process
based on 5 interviews
1 Interview rounds
- Technical Round
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based on 67 reviews
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