# Principles and Experiments of Communications

Size: px
Start display at page:

## Transcription

1 1 Principles and Experiments of Communications Weiyao Lin Dept. of Electronic Engineering Shanghai Jiao Tong University Textbook: Chapter 11 Lecture 06: Multicarrier modulation and OFDM

2 Multicarrier Modulation Multipath channels cause intersymbol interference (ISI) when the reciprocal of the symbol rate is smaller than the dispersion of the nonideal channel. A solution: Subdivide the available channel bandwidth into a number of equal-bandwidth subchannels; The frequency response characteristics of each subchannel are nearly ideal.

3 Subdivision of Channel Bandwidth 1 D f = T where T is the symbol interval 3

4 Orthogonal Frequency Division Multiplexing (1/) Each subchannel associate a carrier k ( ) = cos p, = 0,1,!, -1 x t f t k N k Orthogonal Frequency Division Multiplexing (OFDM) The subcarriers are orthogonal over the symbol interval; Independently of the relative phase relationship between subcarriers. ò T 0 ( p f ) ( p f ) cos f t + cos f t + dt = 0 i i j j 4

5 Orthogonal Frequency Division Multiplexing (/) 5

6 Modulation Each OFDM symbol is the sum of signals modulated by subcarriers. OFDM symbol can express as N -1 ì é æ i ö ùü s( t) = Re í å d N exp jp fc ( t ts) t i s t ts T + ê ç - - ý + i=-n ú î ë è ø ûþ equivalent baseband signal N -1 é i ù s( t) = å d N exp jp ( t ts) t i s t ts T + ê - + i=-n ë T ú û 6

7 For the k th signal Demodulation ^ N -1 1 ts + T k- N i k = exp s N exp t i s Tò p - å s T i=-n T é ù é ù d ê j ( t t ) ú d ê j p ( t t ) ú dt ë û ë û N -1 1 ts + T é i- k+ N å N exp p i+ ò t ê s i=-n T ù = d j ( t - ts) dt T ë ú û = d k 7

8 Modulation and Demodulation of OFDM System 8

9 FFT and IFFT Inverse DFT and IDFT are critical in the implementation of an OFDM system N -1 1 IDFT x[n]= å xke [ ] N DFT N -1 å n= 0 n= 0 x[k]= x[ n] e p j kn N p - j kn N IFFT and FFT algorithms are the fast implementation for the IDFT and DFT 9

10 Modulation Using IDFT OFDM equivalent baseband signal can implement with IDFT. let 0, N -1 é i ù s( t) = å d N exp jp ( t ts) t i s t ts T + ê - + i=-n ë T ú û t s = t = kt, k = 0,1,!, N -1 N N -1 ækt ö æ p ki ö s( k) = sç = å di expç j 0 k N -1 è N ø i= 0 è N ø s( k) is IDFT of d i 10

11 At the receiver Demodulation Using DFT N -1 æ p ki ö di = å s( k) expç - j 0 i N -1 k = 0 è N ø Modulating the transmitted signal and demodulating the received signal is equivalent to the computation of the IDFT and its inverse. 11

12 OFDM via the FFT Algorithm Algorithm complexity DFT/IDFT: FFT/IFFT: ( ) O N æ N ö Oç log ( N) è ø Implement the OFDM system via the FFT algorithm instead of DFT algorithm can be achieved more easily. 1

13 Eliminate ISI (1/) To eliminate ISI, we need to insert guard interval between OFDM symbols. If the guard interval is larger than the delay spread, the multipath component of a symbol does not interfere with adjacent symbols. 13

14 Eliminate ISI (/) An alternative approach is to append cyclic prefix to each OFDM symbol Since the ISI in any pair of successive signal transmission block only affects the cyclic prefix, we discard the affected samples of received signal to eliminate ISI 14

15 3 cases: Cyclic Prefix and Delay Spread (a) Delay Spread < Cyclic Prefix (b) Delay Spread is 3% over Cyclic Prefix (c) Delay Spread is 10% over Cyclic Prefix 15

16 Multicarrier OFDM Comunication System 16

17 The AWGN Channel Model The channel is assumed to corrupt the signal by the addition of white Gaussian noise as shown in the following figure. 17

18 OFDM System Performance over AWGN Channel (1/3) 18

19 QAM OFDM System Performance over AWGN Channel (/3) M-ary PSK ( M - ) ( M )! p( c I) ( M ) p( c II) p( c III) 1 ì 1 pe, M -QAM = 1 é í log M î M êë a = 3Es 1 é æ a öù p( c I) = ê1- Q ú ê ç N ë è 0 øúû é ùé ù æ a ö æ a ö p( c II) = ê1-q úê1-q ú ê ç N ç 0 N ë è øúê ûë è 0 øúû é æ a öù p( c III) = ê1- Q ú ê ç N ë è 0 øúû æ Es æ p öö pe» erfc ç sin ç N0 èm ø è ø ùü úý ûþ 19

20 OFDM System Performance over AWGN Channel (3/3) BER versus SNR curves for the OFDM system in AWGN channel using BPSK/QPSK, 16QAM, 64QAM, 56QAM 0

21 SNR per subchannel The SNR per subchannel can be defined as: SNR k = TP C k s k nk In subchannels with high SNR, we transmit more bits/symbol. Thus, the bit rate on each subchannel can be optimized 1

22 Spectra of OFDM Signal (1/) OFDM signals are orthogonal in the time domain but have significant overlap in frequency domain.

23 Spectra of OFDM Signal (/) The large spectral overlap of the OFDM signals causes intersubchannel interference (ICI) when the communication channel is a fading channel OFDM may not be as robust as a single carrier system in radio communications where the receiving terminal is moving at high speed 3

24 Peak-to-Average Power Ratio Major problem: high PAPR Large peaks occurs when the signals in the K subchannels add constructively in phase. Such large signal peaks may saturate the power amplifier at the transmission, thus, causing intermodulation distortion in the transmitted signal. Solution: Insert different phase shifts in each of the subcarriers; Modulate a small subset of the subcarriers with dummy symbol. 4

25 Applications of OFDM Digital audio broadcasting (DAB) Digital video broadcasting (DVB) Digital subscriber lines (DSL) Wireless local area networks (LANs) 5

26 Advantages and disadvantages Advantages: High data rate Immunity to delay spread Efficient bandwidth Disadvantages: of OFDM The problem of Synchronization Need FFT units at transmitter, reciver The problem of high peak to average power ratio (PAPR) 6

### Multi-carrier Modulation and OFDM

3/28/2 Multi-carrier Modulation and OFDM Prof. Luiz DaSilva dasilval@tcd.ie +353 896-366 Multi-carrier systems: basic idea Typical mobile radio channel is a fading channel that is flat or frequency selective

### Lecture 13. Introduction to OFDM

Lecture 13 Introduction to OFDM Ref: About-OFDM.pdf Orthogonal frequency division multiplexing (OFDM) is well-known to be effective against multipath distortion. It is a multicarrier communication scheme,

### Orthogonal frequency division multiplexing (OFDM)

Orthogonal frequency division multiplexing (OFDM) OFDM was introduced in 1950 but was only completed in 1960 s Originally grew from Multi-Carrier Modulation used in High Frequency military radio. Patent

### Chapter 0 Outline. NCCU Wireless Comm. Lab

Chapter 0 Outline Chapter 1 1 Introduction to Orthogonal Frequency Division Multiplexing (OFDM) Technique 1.1 The History of OFDM 1.2 OFDM and Multicarrier Transmission 1.3 The Applications of OFDM 2 Chapter

### Orthogonal Frequency Division Multiplexing (OFDM)

Orthogonal Frequency Division Multiplexing (OFDM) Presenter: Engr. Dr. Noor M. Khan Professor Department of Electrical Engineering, Muhammad Ali Jinnah University, Islamabad Campus, Islamabad, PAKISTAN

### Practical issue: Group definition. TSTE17 System Design, CDIO. Quadrature Amplitude Modulation (QAM) Components of a digital communication system

1 2 TSTE17 System Design, CDIO Introduction telecommunication OFDM principle How to combat ISI How to reduce out of band signaling Practical issue: Group definition Project group sign up list will be put

### Chapter 5 OFDM. Office Hours: BKD Tuesday 14:00-16:00 Thursday 9:30-11:30

Chapter 5 OFDM 1 Office Hours: BKD 3601-7 Tuesday 14:00-16:00 Thursday 9:30-11:30 2 OFDM: Overview Let S 1, S 2,, S N be the information symbol. The discrete baseband OFDM modulated symbol can be expressed

### S.D.M COLLEGE OF ENGINEERING AND TECHNOLOGY

VISHVESHWARAIAH TECHNOLOGICAL UNIVERSITY S.D.M COLLEGE OF ENGINEERING AND TECHNOLOGY A seminar report on Orthogonal Frequency Division Multiplexing (OFDM) Submitted by Sandeep Katakol 2SD06CS085 8th semester

### Performance Evaluation of Wireless Communication System Employing DWT-OFDM using Simulink Model

Performance Evaluation of Wireless Communication System Employing DWT-OFDM using Simulink Model M. Prem Anand 1 Rudrashish Roy 2 1 Assistant Professor 2 M.E Student 1,2 Department of Electronics & Communication

### SC - Single carrier systems One carrier carries data stream

Digital modulation SC - Single carrier systems One carrier carries data stream MC - Multi-carrier systems Many carriers are used for data transmission. Data stream is divided into sub-streams and each

### SHIV SHAKTI International Journal of in Multidisciplinary and Academic Research (SSIJMAR) Vol. 3, No. 4, August-September (ISSN )

SHIV SHAKTI International Journal of in Multidisciplinary and Academic Research (SSIJMAR) Vol. 3, No. 4, August-September (ISSN 2278 5973) Orthogonal Frequency Division Multiplexing: Issues and Applications

### Lecture 5: Simulation of OFDM communication systems

Lecture 5: Simulation of OFDM communication systems March 28 April 9 28 Yuping Zhao (Doctor of Science in technology) Professor, Peking University Beijing, China Yuping.zhao@pku.edu.cn Single carrier communcation

### Implementation and Comparative analysis of Orthogonal Frequency Division Multiplexing (OFDM) Signaling Rashmi Choudhary

Implementation and Comparative analysis of Orthogonal Frequency Division Multiplexing (OFDM) Signaling Rashmi Choudhary M.Tech Scholar, ECE Department,SKIT, Jaipur, Abstract Orthogonal Frequency Division

### OFDM system: Discrete model Spectral efficiency Characteristics. OFDM based multiple access schemes. OFDM sensitivity to synchronization errors

Introduction - Motivation OFDM system: Discrete model Spectral efficiency Characteristics OFDM based multiple access schemes OFDM sensitivity to synchronization errors 4 OFDM system Main idea: to divide

### Performance Analysis Of OFDM Using 4 PSK, 8 PSK And 16 PSK

Performance Analysis Of OFDM Using 4 PSK, 8 PSK And 16 PSK Virat Bhambhe M.Tech. Student, Electrical and Electronics Engineering Gautam Buddh Technical University (G.B.T.U.), Lucknow (U.P.), India Dr.

### Experimenting with Orthogonal Frequency-Division Multiplexing OFDM Modulation

FUTEBOL Federated Union of Telecommunications Research Facilities for an EU-Brazil Open Laboratory Experimenting with Orthogonal Frequency-Division Multiplexing OFDM Modulation The content of these slides

### Orthogonal Frequency Division Multiplexing & Measurement of its Performance

Available Online at www.ijcsmc.com International Journal of Computer Science and Mobile Computing A Monthly Journal of Computer Science and Information Technology IJCSMC, Vol. 5, Issue. 2, February 2016,

### PEAK TO AVERAGE POWER RATIO REDUCTION USING BANDWIDTH EFFICIENCY INCREASING METHOD IN OFDM SYSTEM

www.arpapress.com/volumes/vol6issue/ijrras_6.pdf PEAK TO AVERAGE POWER RATIO REDUCTIO USIG BADWIDTH EFFICIECY ICREASIG METHOD I OFDM SYSTEM A.A. Abdul Wahab and M. F. Ain School of Electrical and Electronic

### Orthogonal Frequency Division Multiplexing (OFDM) based Uplink Multiple Access Method over AWGN and Fading Channels

Orthogonal Frequency Division Multiplexing (OFDM) based Uplink Multiple Access Method over AWGN and Fading Channels Prashanth G S 1 1Department of ECE, JNNCE, Shivamogga ---------------------------------------------------------------------***----------------------------------------------------------------------

### UNIFIED DIGITAL AUDIO AND DIGITAL VIDEO BROADCASTING SYSTEM USING ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING (OFDM) SYSTEM

UNIFIED DIGITAL AUDIO AND DIGITAL VIDEO BROADCASTING SYSTEM USING ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING (OFDM) SYSTEM 1 Drakshayini M N, 2 Dr. Arun Vikas Singh 1 drakshayini@tjohngroup.com, 2 arunsingh@tjohngroup.com

### Channel Estimation in Multipath fading Environment using Combined Equalizer and Diversity Techniques

International Journal of Scientific & Engineering Research Volume3, Issue 1, January 2012 1 Channel Estimation in Multipath fading Environment using Combined Equalizer and Diversity Techniques Deepmala

### COMPARISON OF CHANNEL ESTIMATION AND EQUALIZATION TECHNIQUES FOR OFDM SYSTEMS

COMPARISON OF CHANNEL ESTIMATION AND EQUALIZATION TECHNIQUES FOR OFDM SYSTEMS Sanjana T and Suma M N Department of Electronics and communication, BMS College of Engineering, Bangalore, India ABSTRACT In

### Evaluation of BER and PAPR by using Different Modulation Schemes in OFDM System

International Journal of Computer Networks and Communications Security VOL. 3, NO. 7, JULY 2015, 277 282 Available online at: www.ijcncs.org E-ISSN 2308-9830 (Online) / ISSN 2410-0595 (Print) Evaluation

### Design and Simulation of COFDM for High Speed Wireless Communication and Performance Analysis

Design and Simulation of COFDM for High Speed Wireless Communication and Performance Analysis Arun Agarwal ITER College, Siksha O Anusandhan University Department of Electronics and Communication Engineering

### Performance analysis of FFT based and Wavelet Based SC-FDMA in Lte

Performance analysis of FFT based and Wavelet Based SC-FDMA in Lte Shanklesh M. Vishwakarma 1, Prof. Tushar Uplanchiwar 2,Prof.MissRohiniPochhi Dept of ECE,Tgpcet,Nagpur Abstract Single Carrier Frequency

### Performance Improvement of OFDM System using Raised Cosine Windowing with Variable FFT Sizes

International Journal of Research (IJR) Vol-1, Issue-6, July 14 ISSN 2348-6848 Performance Improvement of OFDM System using Raised Cosine Windowing with Variable FFT Sizes Prateek Nigam 1, Monika Sahu

### Channel Estimation in Wireless OFDM Systems

Estimation in Wireless OFDM Systems Govind Patidar M. Tech. Scholar, Electronics & Communication Engineering Mandsaur Institute of Technology Mandsaur,India gp.patidar10@gmail.com Abstract Orthogonal frequency

### Performance Evaluation of OFDM System with Rayleigh, Rician and AWGN Channels

Performance Evaluation of OFDM System with Rayleigh, Rician and AWGN Channels Abstract A Orthogonal Frequency Division Multiplexing (OFDM) scheme offers high spectral efficiency and better resistance to

### WAVELET OFDM WAVELET OFDM

EE678 WAVELETS APPLICATION ASSIGNMENT WAVELET OFDM GROUP MEMBERS RISHABH KASLIWAL rishkas@ee.iitb.ac.in 02D07001 NACHIKET KALE nachiket@ee.iitb.ac.in 02D07002 PIYUSH NAHAR nahar@ee.iitb.ac.in 02D07007

### CHAPTER 3 ADAPTIVE MODULATION TECHNIQUE WITH CFO CORRECTION FOR OFDM SYSTEMS

44 CHAPTER 3 ADAPTIVE MODULATION TECHNIQUE WITH CFO CORRECTION FOR OFDM SYSTEMS 3.1 INTRODUCTION A unique feature of the OFDM communication scheme is that, due to the IFFT at the transmitter and the FFT

### BER Analysis for MC-CDMA

BER Analysis for MC-CDMA Nisha Yadav 1, Vikash Yadav 2 1,2 Institute of Technology and Sciences (Bhiwani), Haryana, India Abstract: As demand for higher data rates is continuously rising, there is always

University of Tennessee, Knoxville Trace: Tennessee Research and Creative Exchange Masters Theses Graduate School 8-2004 Bit Loading and Peak Average Power Reduction Techniques for Adaptive Orthogonal

### An Equalization Technique for Orthogonal Frequency-Division Multiplexing Systems in Time-Variant Multipath Channels

IEEE TRANSACTIONS ON COMMUNICATIONS, VOL 47, NO 1, JANUARY 1999 27 An Equalization Technique for Orthogonal Frequency-Division Multiplexing Systems in Time-Variant Multipath Channels Won Gi Jeon, Student

### Underwater communication implementation with OFDM

Indian Journal of Geo-Marine Sciences Vol. 44(2), February 2015, pp. 259-266 Underwater communication implementation with OFDM K. Chithra*, N. Sireesha, C. Thangavel, V. Gowthaman, S. Sathya Narayanan,

### Comparative Study of OFDM & MC-CDMA in WiMAX System

IOSR Journal of Electronics and Communication Engineering (IOSR-JECE) e-issn: 2278-2834,p- ISSN: 2278-8735.Volume 9, Issue 1, Ver. IV (Jan. 2014), PP 64-68 Comparative Study of OFDM & MC-CDMA in WiMAX

### Mobile & Wireless Networking. Lecture 2: Wireless Transmission (2/2)

192620010 Mobile & Wireless Networking Lecture 2: Wireless Transmission (2/2) [Schiller, Section 2.6 & 2.7] [Reader Part 1: OFDM: An architecture for the fourth generation] Geert Heijenk Outline of Lecture

### Techniques for Mitigating the Effect of Carrier Frequency Offset in OFDM

IOSR Journal of Electronics and Communication Engineering (IOSR-JECE) e-issn: 2278-2834,p- ISSN: 2278-8735.Volume 10, Issue 3, Ver. III (May - Jun.2015), PP 31-37 www.iosrjournals.org Techniques for Mitigating

### Introduction to OFDM Systems

Introduction to OFDM Systems Dr. Prapun Suksompong prapun@siit.tu.ac.th June 23, 2010 1 Outline 1. Overview of OFDM technique 2. Wireless Channel 3. Multi-carrier Transmission 4. Implementation: DFT and

### Outline / Wireless Networks and Applications Lecture 7: Physical Layer OFDM. Frequency-Selective Radio Channel. How Do We Increase Rates?

Page 1 Outline 18-452/18-750 Wireless Networks and Applications Lecture 7: Physical Layer OFDM Peter Steenkiste Carnegie Mellon University RF introduction Modulation and multiplexing Channel capacity Antennas

Receiver Designs for the Radio Channel COS 463: Wireless Networks Lecture 15 Kyle Jamieson [Parts adapted from C. Sodini, W. Ozan, J. Tan] Today 1. Delay Spread and Frequency-Selective Fading 2. Time-Domain

### Performance Analysis of ICI in OFDM systems using Self-Cancellation and Extended Kalman Filtering

Performance Analysis of ICI in OFDM systems using Self-Cancellation and Extended Kalman Filtering C.Satya Haritha, K.Prasad Abstract - Orthogonal Frequency Division Multiplexing (OFDM) is a multicarrier

### OFDM AS AN ACCESS TECHNIQUE FOR NEXT GENERATION NETWORK

OFDM AS AN ACCESS TECHNIQUE FOR NEXT GENERATION NETWORK Akshita Abrol Department of Electronics & Communication, GCET, Jammu, J&K, India ABSTRACT With the rapid growth of digital wireless communication

### OFDM (Orthogonal Frequency Division Multiplexing) SIMULATION USING MATLAB Neha Pathak MTech Scholar, Shri am Institute of Technology

OFDM (Orthogonal Frequency Division Multiplexing) SIMULATION USING MATLAB Neha Pathak MTech Scholar, Shri am Institute of Technology ABSTRACT This paper discusses the design and implementation of an OFDM

### MITIGATING CARRIER FREQUENCY OFFSET USING NULL SUBCARRIERS

International Journal on Intelligent Electronic System, Vol. 8 No.. July 0 6 MITIGATING CARRIER FREQUENCY OFFSET USING NULL SUBCARRIERS Abstract Nisharani S N, Rajadurai C &, Department of ECE, Fatima

### REDUCING PAPR OF OFDM BASED WIRELESS SYSTEMS USING COMPANDING WITH CONVOLUTIONAL CODES

REDUCING PAPR OF OFDM BASED WIRELESS SYSTEMS USING COMPANDING WITH CONVOLUTIONAL CODES Pawan Sharma 1 and Seema Verma 2 1 Department of Electronics and Communication Engineering, Bhagwan Parshuram Institute

### EC 551 Telecommunication System Engineering. Mohamed Khedr

EC 551 Telecommunication System Engineering Mohamed Khedr http://webmail.aast.edu/~khedr 1 Mohamed Khedr., 2008 Syllabus Tentatively Week 1 Week 2 Week 3 Week 4 Week 5 Week 6 Week 7 Week 8 Week 9 Week

### Performance Analysis of LTE System in term of SC-FDMA & OFDMA Monika Sehrawat 1, Priyanka Sharma 2 1 M.Tech Scholar, SPGOI Rohtak

Performance Analysis of LTE System in term of SC-FDMA & OFDMA Monika Sehrawat 1, Priyanka Sharma 2 1 M.Tech Scholar, SPGOI Rohtak 2 Assistant Professor, ECE Deptt. SPGOI Rohtak Abstract - To meet the increasing

### S PG Course in Radio Communications. Orthogonal Frequency Division Multiplexing Yu, Chia-Hao. Yu, Chia-Hao 7.2.

S-72.4210 PG Course in Radio Communications Orthogonal Frequency Division Multiplexing Yu, Chia-Hao chyu@cc.hut.fi 7.2.2006 Outline OFDM History OFDM Applications OFDM Principles Spectral shaping Synchronization

### Page 1. Overview : Wireless Networks Lecture 9: OFDM, WiMAX, LTE

Overview 18-759: Wireless Networks Lecture 9: OFDM, WiMAX, LTE Dina Papagiannaki & Peter Steenkiste Departments of Computer Science and Electrical and Computer Engineering Spring Semester 2009 http://www.cs.cmu.edu/~prs/wireless09/

### Orthogonal Frequency Domain Multiplexing

Chapter 19 Orthogonal Frequency Domain Multiplexing 450 Contents Principle and motivation Analogue and digital implementation Frequency-selective channels: cyclic prefix Channel estimation Peak-to-average

### Performance Analysis of OFDM for Different Digital Modulation Schemes using Matlab Simulation

J. Bangladesh Electron. 10 (7-2); 7-11, 2010 Performance Analysis of OFDM for Different Digital Modulation Schemes using Matlab Simulation Md. Shariful Islam *1, Md. Asek Raihan Mahmud 1, Md. Alamgir Hossain

### An OFDM Transmitter and Receiver using NI USRP with LabVIEW

An OFDM Transmitter and Receiver using NI USRP with LabVIEW Saba Firdose, Shilpa B, Sushma S Department of Electronics & Communication Engineering GSSS Institute of Engineering & Technology For Women Abstract-

### Multi-carrier and Multiple antennas

RADIO SYSTEMS ETIN15 Lecture no: 10 Multi-carrier and Multiple antennas Ove Edfors, Department of Electrical and Information Technology Ove.Edfors@eit.lth.se 1 Contents Multicarrier systems History of

### FREQUENCY RESPONSE BASED RESOURCE ALLOCATION IN OFDM SYSTEMS FOR DOWNLINK

FREQUENCY RESPONSE BASED RESOURCE ALLOCATION IN OFDM SYSTEMS FOR DOWNLINK Seema K M.Tech, Digital Electronics and Communication Systems Telecommunication department PESIT, Bangalore-560085 seema.naik8@gmail.com

### 1. Introduction. 2. OFDM Primer

A Novel Frequency Domain Reciprocal Modulation Technique to Mitigate Multipath Effect for HF Channel *Kumaresh K, *Sree Divya S.P & **T. R Rammohan Central Research Laboratory Bharat Electronics Limited

### Analysis of Interference & BER with Simulation Concept for MC-CDMA

IOSR Journal of Electronics and Communication Engineering (IOSR-JECE) e-issn: 2278-2834,p- ISSN: 2278-8735.Volume 9, Issue 4, Ver. IV (Jul - Aug. 2014), PP 46-51 Analysis of Interference & BER with Simulation

### CH. 7 Synchronization Techniques for OFDM Systems

CH. 7 Synchronization Techniues for OFDM Systems 1 Contents Introduction Sensitivity to Phase Noise Sensitivity to Freuency Offset Sensitivity to Timing Error Synchronization Using the Cyclic Extension

### Overview. M. Xiao CommTh/EES/KTH. Wednesday, Feb. 17, :00-12:00, B23

: Advanced Digital Communications (EQ2410) 1 Wednesday, Feb. 17, 2016 10:00-12:00, B23 1 Textbook: U. Madhow, Fundamentals of Digital Communications, 2008 1 / 1 Overview Lecture 7 Characteristics of wireless

### Error Probability of Different Modulation Schemes for OFDM based WLAN standard IEEE a

Error Probability of Different Modulation Schemes for OFDM based WLAN standard IEEE 802.11a Sanjeev Kumar Asst. Professor/ Electronics & Comm. Engg./ Amritsar college of Engg. & Technology, Amritsar, 143001,

### OFDM and FFT. Cairo University Faculty of Engineering Department of Electronics and Electrical Communications Dr. Karim Ossama Abbas Fall 2010

OFDM and FFT Cairo University Faculty of Engineering Department of Electronics and Electrical Communications Dr. Karim Ossama Abbas Fall 2010 Contents OFDM and wideband communication in time and frequency

### Performance Analysis of OFDM System in Multipath Fading Environment

Performance Analysis of OFDM System in Multipath Fading Environment Kratika Gupta riyagupta180@yahoo.com Pratibha Nagaich pratibha.nagaich@trubainstitute.ac.in Abstract A detailed study of the OFDM technique

### Comparison of ML and SC for ICI reduction in OFDM system

Comparison of and for ICI reduction in OFDM system Mohammed hussein khaleel 1, neelesh agrawal 2 1 M.tech Student ECE department, Sam Higginbottom Institute of Agriculture, Technology and Science, Al-Mamon

### Performance Analysis of OFDM System with QPSK for Wireless Communication

IOSR Journal of Electronics and Communication Engineering (IOSR-JECE) e-issn: 2278-2834,p- ISSN: 2278-8735.Volume 11, Issue 3, Ver. I (May-Jun.2016), PP 33-37 www.iosrjournals.org Performance Analysis

### A Research Concept on Bit Rate Detection using Carrier offset through Analysis of MC-CDMA SYSTEM

Available Online at www.ijcsmc.com International Journal of Computer Science and Mobile Computing A Monthly Journal of Computer Science and Information Technology ISSN 2320 088X IMPACT FACTOR: 5.258 IJCSMC,

### Optimal Number of Pilots for OFDM Systems

IOSR Journal of Electronics and Communication Engineering (IOSR-JECE) e-issn: 2278-2834,p- ISSN: 2278-8735.Volume 8, Issue 6 (Nov. - Dec. 2013), PP 25-31 Optimal Number of Pilots for OFDM Systems Onésimo

### PERFORMANCE OF CODED OFDM IN IMPULSIVE NOISE ENVIRONMENT

PERFORMANCE OF CODED OFDM IN IMPULSIVE NOISE ENVIRONMENT CH SEKHARARAO. K 1, S.S.MOHAN REDDY 2, K.RAVI KUMAR 3 1 Student, M.Tech, Dept. of ECE, S.R.K.R. Engineering College, Bhimavaram,AP, India. 2 Associate

### Part 3. Multiple Access Methods. p. 1 ELEC6040 Mobile Radio Communications, Dept. of E.E.E., HKU

Part 3. Multiple Access Methods p. 1 ELEC6040 Mobile Radio Communications, Dept. of E.E.E., HKU Review of Multiple Access Methods Aim of multiple access To simultaneously support communications between

### An Overview of PAPR Reduction Techniques In Concerned with OFDM

An Overview of PAPR Reduction Techniques In Concerned with OFDM Prof. Kailas Prof.Sharan Gowda Prof.Annarao Mr.Ramchandrappa Assistant Professor Assistant Professor Assistant Professor M.Tech Scholar E&CE

### Principles of Multicarrier Modulation and OFDM a

Principles of Multicarrier Modulation and OFDM a Lie-Liang Yang Communications Research Group Faculty of Physical and Applied Sciences, University of Southampton, SO17 1BJ, UK. Tel: +44 23 8059 3364, Fax:

### Clipping and Filtering Technique for reducing PAPR In OFDM

IOSR Journal of Engineering (IOSRJEN) e-issn: 2250-3021, p-issn: 2278-8719, Volume 2, Issue 9 (September 2012), PP 91-97 Clipping and Filtering Technique for reducing PAPR In OFDM Saleh Albdran 1, Ahmed

### CARRIER FREQUENCY OFFSET ESTIMATION ALGORITHMS IN ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING SYSTEMS

CARRIER FREQUENCY OFFSET ESTIMATION ALGORITHMS IN ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING SYSTEMS Feng Yang School of Electrical & Electronic Engineering A thesis submitted to the Nanyang Technological

### OFDM Systems For Different Modulation Technique

Computing For Nation Development, February 08 09, 2008 Bharati Vidyapeeth s Institute of Computer Applications and Management, New Delhi OFDM Systems For Different Modulation Technique Mrs. Pranita N.

### Performance Study of OFDM Over Fading Channels for Wireless Communications

University of Denver Digital Commons @ DU Electronic Theses and Dissertations Graduate Studies 1-1-2012 Performance Study of OFDM Over Fading Channels for Wireless Communications Ahmed Alshammari University

### Analytical Review of Orthogonal Frequency Division Multiplexing (OFDM)

Analytical Review of Orthogonal Frequency Division Multiplexing (OFDM) Shaika Mukhtar Abstract From high speed internet and broadband connections to HD digital TV transmission, humans have experienced

### Space Time Block Coding - Spatial Modulation for Multiple-Input Multiple-Output OFDM with Index Modulation System

Space Time Block Coding - Spatial Modulation for Multiple-Input Multiple-Output OFDM with Index Modulation System Ravi Kumar 1, Lakshmareddy.G 2 1 Pursuing M.Tech (CS), Dept. of ECE, Newton s Institute

### PAPR Reduction techniques in OFDM System Using Clipping & Filtering and Selective Mapping Methods

PAPR Reduction techniques in OFDM System Using Clipping & Filtering and Selective Mapping Methods Okello Kenneth 1, Professor Usha Neelakanta 2 1 P.G. Student, Department of Electronics & Telecommunication

### Performance Analysis of Ofdm Transceiver using Gmsk Modulation Technique

Performance Analysis of Ofdm Transceiver using Gmsk Modulation Technique Gunjan Negi Student, ECE Department GRD Institute of Management and Technology Dehradun, India negigunjan10@gmail.com Anuj Saxena

### Low Complexity PAPR Reduction Technique for Coded OFDM Systems with Scrambling Approach

Research Article International Journal of Current Engineering and Technology ISSN 77-4106 014 INPRESSCO. All Rights Reserved. Available at http://inpressco.com/category/ijcet Low Complexity PAPR Reduction

### ANALYSIS AND STUDY OF MULTI-SYMBOL ENCAPSULATED ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING

ANALYSIS AND STUDY OF MULTI-SYMBOL ENCAPSULATED ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF Bachelor of Technology In Electronics

### ELEC 546 Lecture #9. Orthogonal Frequency Division Multiplexing (OFDM): Basic OFDM System

ELEC 546 Lecture #9 Ortogonal Frequency Division Multiplexing (OFDM): Basic OFDM System Outline Motivations Diagonalization of Vector Cannels Transmission of one OFDM Symbol Transmission of sequence of

### With a lot of material from Rich Nicholls, CTL/RCL and Kurt Sundstrom, of unknown whereabouts

Signal Processing for OFDM Communication Systems Eric Jacobsen Minister of Algorithms, Intel Labs Communication Technology Laboratory/ Radio Communications Laboratory July 29, 2004 With a lot of material

### A Comparative performance analysis of CFO Estimation in OFDM Systems for Urban, Rural and Rayleigh area using CP and Moose Technique

International Journal of Current Engineering and Technology E-ISSN 2277 4106, P-ISSN 2347 5161 2015 INPRESSCO, All Rights Reserved Available at http://inpressco.com/category/ijcet Research Article A Comparative

### Key words: OFDM, FDM, BPSK, QPSK.

Volume 4, Issue 3, March 2014 ISSN: 2277 128X International Journal of Advanced Research in Computer Science and Software Engineering Research Paper Available online at: www.ijarcsse.com Analyse the Performance

### Pilot-based channel estimation in OFDM system

The University of Toledo The University of Toledo Digital Repository Theses and Dissertations 2011 Pilot-based channel estimation in OFDM system Fei Wang The University of Toledo Follow this and additional

### Simulative Investigations for Robust Frequency Estimation Technique in OFDM System

, pp. 187-192 http://dx.doi.org/10.14257/ijfgcn.2015.8.4.18 Simulative Investigations for Robust Frequency Estimation Technique in OFDM System Kussum Bhagat 1 and Jyoteesh Malhotra 2 1 ECE Department,

### Frequency Offset Compensation In OFDM System Using Neural Network

Frequency Offset Compensation In OFDM System Using Neural Network Rachana P. Borghate 1, Suvarna K. Gosavi 2 Lecturer, Dept. of ETRX, Rajiv Gandhi college of Engg, Nagpur, Maharashtra, India 1 Lecturer,

### Adaptive communications techniques for the underwater acoustic channel

Adaptive communications techniques for the underwater acoustic channel James A. Ritcey Department of Electrical Engineering, Box 352500 University of Washington, Seattle, WA 98195 Tel: (206) 543-4702,

### Technical Aspects of LTE Part I: OFDM

Technical Aspects of LTE Part I: OFDM By Mohammad Movahhedian, Ph.D., MIET, MIEEE m.movahhedian@mci.ir ITU regional workshop on Long-Term Evolution 9-11 Dec. 2013 Outline Motivation for LTE LTE Network

OFDM Transciever for Nonlinear Communication Systems 1 Shatrughna Prasad Yadav, 2 Subhash Chandra Bera 1 EEE Department, Indus University, Ahmedabad 2 Satcom & Navigation Systems Eng. Division, SAC, ISRO,

### ATSC 3.0 Physical Layer Overview

ATSC 3.0 Physical Layer Overview Agenda Terminology Real world concerns Technology to combat those concerns Summary Basic Terminology What is OFDM? What is FEC? What is Shannon s Theorem? What does BER

### CE-OFDM with a Block Channel Estimator

CE-OFDM with a Block Estimator Nikolai de Figueiredo and Louis P. Linde Department of Electrical, Electronic and Computer Engineering University of Pretoria Pretoria, South Africa Tel: +27 12 420 2953,

### PERFORMANCE EVALUATION OF VFFT-OFDM SYSTEM IN THE PRESENCE OF CARRIER FREQUENCY OFFSET

PERFORMANCE EVALUATION OF VFFT-OFDM SYSTEM IN THE PRESENCE OF CARRIER FREQUENCY OFFSET Ni Made Ary Esta Dewi Wirastuti, I Made Arsa Suyadnya, Duman Care Khrisne Study Program of Electrical Engineering

### A New Data Conjugate ICI Self Cancellation for OFDM System

A New Data Conjugate ICI Self Cancellation for OFDM System Abhijeet Bishnu Anjana Jain Anurag Shrivastava Department of Electronics and Telecommunication SGSITS Indore-452003 India abhijeet.bishnu87@gmail.com

### A REVIEW ON ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING 1 Awadhesh Kumar, 2 Mr. Kuldeep Sharma

A REVIEW ON ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING 1 Awadhesh Kumar, 2 Mr. Kuldeep Sharma 1 Research Scholar, Electronics & Communication Engineering Department, Monad University, U.P., INDIA 2 Assistant

### Bit error rate simulation using 16 qam technique in matlab

Volume :2, Issue :5, 59-64 May 2015 www.allsubjectjournal.com e-issn: 2349-4182 p-issn: 2349-5979 Impact Factor: 3.762 Ravi Kant Gupta M.Tech. Scholar, Department of Electronics & Communication, Bhagwant

### ANALYSIS OF BER AND SEP OF QPSK SIGNAL FOR MULTIPLE ANENNAS

ANALYSIS OF BER AND SEP OF QPSK SIGNAL FOR MULTIPLE ANENNAS Suganya.S 1 1 PG scholar, Department of ECE A.V.C College of Engineering Mannampandhal, India Karthikeyan.T 2 2 Assistant Professor, Department

### Performance analysis of OFDM with QPSK using AWGN and Rayleigh Fading Channel

Performance analysis of OFDM with QPSK using AWGN and Rayleigh Fading Channel 1 V.R.Prakash* (A.P) Department of ECE Hindustan university Chennai 2 P.Kumaraguru**(A.P) Department of ECE Hindustan university

### Lecture 3: Wireless Physical Layer: Modulation Techniques. Mythili Vutukuru CS 653 Spring 2014 Jan 13, Monday

Lecture 3: Wireless Physical Layer: Modulation Techniques Mythili Vutukuru CS 653 Spring 2014 Jan 13, Monday Modulation We saw a simple example of amplitude modulation in the last lecture Modulation how