Forschungszentrum Telekommunikation Wien
|
|
- Adele Simon
- 5 years ago
- Views:
Transcription
1 Forschungszentrum Telekommunikation Wien OFDMA/SC-FDMA Basics for 3GPP LTE (E-UTRA) T. Zemen April 24, 2008
2 Outline Part I - OFDMA and SC/FDMA basics Multipath propagation Orthogonal frequency division multiplexing (OFDM) Soft frequency reuse Peak-to-average power ratio (PAPR) Single carrier/frequency division multiple access (SC/FDMA) Part II - Time-variant channel estimation for OFDM Thomas Zemen OFDMA/SC-FDMA Basics for 3GPP LTE (E-UTRA) April 24, /37
3 References Motorola, Long Term Evolution (LTE): Overview of LTE Air-Interface, Technical White Paper, 2007 Rohde&Schwarz, UMTS Long Term Evolution (LTE) Technology Introduction, Freescale, Overview of the 3GPP Long Term Evolution Physical Layer, GPP TS , Physical Channels and Modulation (Rel. 8), March, H. G. Myung, J. Lim, and D. J. Goodman, Single Carrier FDMA for Uplink Wireless Transmission, IEEE Vehicular Technology Magazin, pp , September, U. Sorger, I. De Broeck, and M. Schnell, Interleaved FDMA - A New Spread Spectrum Multiple-Access Scheme, Proc. IEEE ICC 98, Atlanta, GA, pp , June, T. Zemen and C. F. Mecklenbräuker, Time-Variant Channel Estimation using Discrete Prolate Spheroidal Sequences, IEEE Transactions on Signal Processing, vol. 53, no. 9, September 2005, pp Thomas Zemen OFDMA/SC-FDMA Basics for 3GPP LTE (E-UTRA) April 24, /37
4 Time-Variant Multipath Propagation scatterer η 1 e j2πf 1t δ(t τ 1 ) v velocity l path η 0 e j2πf 0t δ(t τ 0 ) η l τ l attenuation time delay user v receiver η 2 e j2πf2t δ(t τ 2 ) f l L Doppler shift number of paths scatterer Time-variant channel impulse response h(t, τ) = L 1 l=0 η l e j2πf lt δ(t τ l ) Thomas Zemen OFDMA/SC-FDMA Basics for 3GPP LTE (E-UTRA) April 24, /37
5 OFDM Fundamentals (I) Single carrier versus multi carrier f single carrier f multi carrier d[0] d[1] d[2] d[0] d[1] d[2] d[3] d[4] d[5] d[6] d[7] d[3] d[4] d[5] d[6] d[7] t 0 T C 0 NT C t 1/T C Chip rate N Number of subcarriers d[0]... d[7] Data symbols Thomas Zemen OFDMA/SC-FDMA Basics for 3GPP LTE (E-UTRA) April 24, /37
6 OFDM Fundamentals (II) Orthogonal subcarriers magnitude f f f q f q+1 f q = q/(nt C ) q {0,..., N 1} Subcarrier index Thomas Zemen OFDMA/SC-FDMA Basics for 3GPP LTE (E-UTRA) April 24, /37
7 Efficiently implementable by means of an inverse discrete Fourier transform. Thomas Zemen OFDMA/SC-FDMA Basics for 3GPP LTE (E-UTRA) April 24, /37 OFDM Fundamentals (III) Processing steps subcarriers f 1 symbols (BPSK) modulated subcarriers t *(+1) t 2*f 1 t *(-1) t + t 3*f 1 t *(+1) t
8 OFDM Fundamentals (IV) Cyclic prefix insertion t T S T S OFDM symbol duration. A copy of the signal tail (length T G ) is inserted at the beginning of each OFDM symbol. Absorbs multipath components. Thomas Zemen OFDMA/SC-FDMA Basics for 3GPP LTE (E-UTRA) April 24, /37
9 OFDM Fundamentals (V) OFDM time frequency representation Symbols FFT Guard Intervals 5 MHz Bandwidth Sub-carriers Frequency Time Thomas Zemen OFDMA/SC-FDMA Basics for 3GPP LTE (E-UTRA) April 24, /37
10 OFDM System Design No inter-symbol interference: Guard interval larger than the delay spread T D GT C = T G > T D Spectral efficiency: Symbol duration much larger than delay spread NT C = T S T D Inter-carrier interference: Symbol rate much higher than Doppler shift f D 1/T S f D G cyclic prefix length in number of chips N number of subcarriers Thomas Zemen OFDMA/SC-FDMA Basics for 3GPP LTE (E-UTRA) April 24, /37
11 Receiver Side Processing Drop cyclic prefix and perform DFT Channel partitioned in N parallel frequency flat channels Simple equalization - complexity grows with N log(n) g[0] n[0] d[0]... g[ q] n[ q] y[0]... d[ q] y[ q] q subcarrier index d data symbol g subcarrier channel coefficient n additive noise y received symbol d[ N-1] y[ N-1] Thomas Zemen OFDMA/SC-FDMA Basics for 3GPP LTE (E-UTRA) April 24, /37
12 OFDMA (I) Orthogonal time-frequency grid a subcarrier frequency an OFDM symbol time Thomas Zemen OFDMA/SC-FDMA Basics for 3GPP LTE (E-UTRA) April 24, /37
13 OFDMA (II) Time division multiple access (TDMA) frequency diversity frequency user 1 user 2 user 3 user 4 user 5 user 6 time Thomas Zemen OFDMA/SC-FDMA Basics for 3GPP LTE (E-UTRA) April 24, /37
14 OFDMA (II) Frequency division multiple access (FDMA) frequency user 1 user 2 user 3 user 4 user 5 user 6 time time diversity Thomas Zemen OFDMA/SC-FDMA Basics for 3GPP LTE (E-UTRA) April 24, /37
15 LTE Parameters (Downlink) Thomas Zemen OFDMA/SC-FDMA Basics for 3GPP LTE (E-UTRA) April 24, /37
16 LTE Resource Grid (Downlink) Thomas Zemen OFDMA/SC-FDMA Basics for 3GPP LTE (E-UTRA) April 24, /37
17 LTE Resource Blocks (Downlink) Thomas Zemen OFDMA/SC-FDMA Basics for 3GPP LTE (E-UTRA) April 24, /37
18 OFDMA (III) Time-variant frequency-selective channel frequency frequency diversity time time diversity Thomas Zemen OFDMA/SC-FDMA Basics for 3GPP LTE (E-UTRA) April 24, /37
19 OFDMA (III) Time-frequency pattern frequency frequency diversity user 1 user 2 user 3 user 4 time time diversity Thomas Zemen OFDMA/SC-FDMA Basics for 3GPP LTE (E-UTRA) April 24, /37
20 Soft Frequency Reuse (I) At cell boundaries the signal to interference ratio (SIR) is approx. 0 db due to frequency reuse 1 DS-CDMA uses soft handover at the cell boundary OFDM based air interface allows soft frequency reuse for users at the cell boundary Thomas Zemen OFDMA/SC-FDMA Basics for 3GPP LTE (E-UTRA) April 24, /37
21 Soft Frequency Reuse (II) power density BS 2 MS 22 BS 1 Power density MS 12 MS 11 MS 21 MS 31 Power density MS 32 subcarrier Subcarriers subcarrier BS 3 Thomas Zemen OFDMA/SC-FDMA Basics for 3GPP LTE (E-UTRA) April 24, /37
22 LTE Uplink Power consumption in user equipment (UE) terminals is limited by battery OFDM requires large dynamic range due to high peak to average power ratio (PAPR) Linear power amplifiers with wide dynamic range have bad efficiency Single carrier/frequecy division multiple access (SC/FDMA) used for the uplink in LTE Thomas Zemen OFDMA/SC-FDMA Basics for 3GPP LTE (E-UTRA) April 24, /37
23 Comparison OFDMA vs. SC/FDMA Thomas Zemen OFDMA/SC-FDMA Basics for 3GPP LTE (E-UTRA) April 24, /37
24 SC/FDMA Distributed vs. Localized Thomas Zemen OFDMA/SC-FDMA Basics for 3GPP LTE (E-UTRA) April 24, /37
25 SC/FDMA Thomas Zemen OFDMA/SC-FDMA Basics for 3GPP LTE (E-UTRA) April 24, /37
26 Processing Steps Thomas Zemen OFDMA/SC-FDMA Basics for 3GPP LTE (E-UTRA) April 24, /37
27 PAPR comparison Thomas Zemen OFDMA/SC-FDMA Basics for 3GPP LTE (E-UTRA) April 24, /37
28 Conclusions - Part I OFDM enables wireless communication in frequency selective channels Channel equalization in the frequency domain Low complexity implementation - fast Fourier transform (FFT) algorithms Time and frequency diversity can be exploited SC/FDMA is OFDM with precoding PAPR of SC/FDMA is 2dB smaller compared to OFDMA Thomas Zemen OFDMA/SC-FDMA Basics for 3GPP LTE (E-UTRA) April 24, /37
29 Outline Part I - OFDMA and SC/FDMA Basics Part II - Time-variant channel estimation for OFDM Signal model Discrete prolate spheroidal sequences Reduced-rank channel estimation Mean square error (MSE) sensitivity to velocity of user equipment Thomas Zemen OFDMA/SC-FDMA Basics for 3GPP LTE (E-UTRA) April 24, /37
30 Time-Variant Channel Estimation for OFDM Signal model for a single flat-fading subcarrier q {0,..., N 1} y m,q = g m,q d m,q + z m,q y m,q z m,q d m,q C, received symbol on subcarrier q at discrete time m {0,..., M 1} C, additive noise C data symbol Thomas Zemen OFDMA/SC-FDMA Basics for 3GPP LTE (E-UTRA) April 24, /37
31 LTE Pilot Pattern Thomas Zemen OFDMA/SC-FDMA Basics for 3GPP LTE (E-UTRA) April 24, /37
32 Reduced-Rank Channel Description Second order statistic is unknown Doppler bandwidth upper bounded by ν Dmax Estimation per frequency-flat subcarrier q {0,..., N 1} Basis Expansion D 1 g m,q γ i,q u i,m for m {0,..., M 1}, D M i=0 g m,q u i,m γ i,q channel coefficient for subcarrier q at time m basis function expansion coefficient Thomas Zemen OFDMA/SC-FDMA Basics for 3GPP LTE (E-UTRA) April 24, /37
33 Slepian Basis Expansion D. Slepian et al. (1961,1978) asked, which sequences have 1 maximum time concentration λ = M 1 u m 2 m=0 u m 2 m= 2 while being bandlimited in [ ν Dmax, ν Dmax ] M 1 l=0 sin(2πν Dmax (l m)) u i,l = λ i u i,m π(l m) Discrete prolate spheroidal (DPS) sequences u i [m] Doubly orthogonal on {,..., } and {0,..., M 1} Subspace has dimension D = 2ν Dmax M + 1 Thomas Zemen OFDMA/SC-FDMA Basics for 3GPP LTE (E-UTRA) April 24, /37
34 Slepian Sequences u 0 [m] u 1 [m] u 2 [m] u 3 [m] u 4 [m] M = 256 block length 1/T S = 49 ks 1 symbol rate v max = 100 km/h velocity f C = 2 GHz carrier D = 5 dimensions m Thomas Zemen OFDMA/SC-FDMA Basics for 3GPP LTE (E-UTRA) April 24, /37
35 Time-Variant Channel Estimation Signal model for a single subcarrier q y m,q = g m,q d m,q + z m,q y m,q z m,q γ i,q C, received symbol on subcarrier q at discrete time m C, additive noise C, basis expansion coefficient Thomas Zemen OFDMA/SC-FDMA Basics for 3GPP LTE (E-UTRA) April 24, /37
36 Time-Variant Channel Estimation Signal model for a single subcarrier q y m,q z m,q γ i,q D 1 y m,q = u i,m γ i,q d m,q + z m,q i=0 C, received symbol on subcarrier q at discrete time m C, additive noise C, basis expansion coefficient Thomas Zemen OFDMA/SC-FDMA Basics for 3GPP LTE (E-UTRA) April 24, /37
37 Pilot Based Channel Estimation (I) D 1 y m,q = u i,m γ i,q d m,q + z m,q i=0 Time multiplexed pilot and data symbols, d m = b m + p m (pilots are known at the receiver side). b m {±1 ± j}/ 2 for m / P and b m = 0 for m P p m = {±1 ± j}/ 2 for m P and p m = 0 for m / P { P = i M J + M } i {0,..., J 1} 2J J pilot symbols Thomas Zemen OFDMA/SC-FDMA Basics for 3GPP LTE (E-UTRA) April 24, /37
38 Pilot Based Channel Estimation (II)... omitting q Basis function vector f m = Coefficient estimates ˆγ = G 1 u 0,m. u D 1,m m P R D, y m p mf m where ˆγ = [ˆγ 0,..., ˆγ (D 1) ] T and the correlation matrix G = l P f l f H l. Thomas Zemen OFDMA/SC-FDMA Basics for 3GPP LTE (E-UTRA) April 24, /37
39 MSE Sensitivity to User Velocity MSE M = 1 M M 1 E { g m g 2} m m=0 Thomas Zemen OFDMA/SC-FDMA Basics for 3GPP LTE (E-UTRA) April 24, /37
40 Conclusions - Part II Detailed channel information at receiver side difficult to acquire Discrete prolate spheroidal sequences describe the subspace of band-limited sequences Reduced-rank channel description using DPS sequences allows for simple UE algorithm Mean-square error (MSE) is practically independent of user velocity Thomas Zemen OFDMA/SC-FDMA Basics for 3GPP LTE (E-UTRA) April 24, /37
Channel Estimation for Downlink LTE System Based on LAGRANGE Polynomial Interpolation
Channel Estimation for Downlink LTE System Based on LAGRANGE Polynomial Interpolation Mallouki Nasreddine,Nsiri Bechir,Walid Hakimiand Mahmoud Ammar University of Tunis El Manar, National Engineering School
More informationFading & OFDM Implementation Details EECS 562
Fading & OFDM Implementation Details EECS 562 1 Discrete Mulitpath Channel P ~ 2 a ( t) 2 ak ~ ( t ) P a~ ( 1 1 t ) Channel Input (Impulse) Channel Output (Impulse response) a~ 1( t) a ~2 ( t ) R a~ a~
More informationPage 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/
More informationOutline / 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
More informationORTHOGONAL frequency division multiplexing (OFDM)
144 IEEE TRANSACTIONS ON BROADCASTING, VOL. 51, NO. 1, MARCH 2005 Performance Analysis for OFDM-CDMA With Joint Frequency-Time Spreading Kan Zheng, Student Member, IEEE, Guoyan Zeng, and Wenbo Wang, Member,
More informationBroadcast Operation. Christopher Schmidt. University of Erlangen-Nürnberg Chair of Mobile Communications. January 27, 2010
Broadcast Operation Seminar LTE: Der Mobilfunk der Zukunft Christopher Schmidt University of Erlangen-Nürnberg Chair of Mobile Communications January 27, 2010 Outline 1 Introduction 2 Single Frequency
More informationPerformance 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
More informationECE5984 Orthogonal Frequency Division Multiplexing and Related Technologies Fall Mohamed Essam Khedr. Fading Channels
ECE5984 Orthogonal Frequency Division Multiplexing and Related Technologies Fall 2007 Mohamed Essam Khedr Fading Channels Major Learning Objectives Upon successful completion of the course the student
More informationS 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
More informationTechnical 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
More informationPerformance 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
More informationOrthogonal 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
More informationResearches in Broadband Single Carrier Multiple Access Techniques
Researches in Broadband Single Carrier Multiple Access Techniques Workshop on Fundamentals of Wireless Signal Processing for Wireless Systems Tohoku University, Sendai, 2016.02.27 Dr. Hyung G. Myung, Qualcomm
More informationECS455: Chapter 6 Applications
ECS455: Chapter 6 Applications 6.2 WiMAX 1 Dr.Prapun Suksompong prapun.com/ecs455 Office Hours: BKD 3601-7 Wednesday 15:30-16:30 Friday 9:30-10:30 Advanced Mobile Wirless Systems (IEEE) (Ultra Mobile Broadband)
More informationUniversity of Bristol - Explore Bristol Research. Link to publication record in Explore Bristol Research PDF-document.
Mansor, Z. B., Nix, A. R., & McGeehan, J. P. (2011). PAPR reduction for single carrier FDMA LTE systems using frequency domain spectral shaping. In Proceedings of the 12th Annual Postgraduate Symposium
More informationEC 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
More informationCHANNEL ESTIMATION FOR BLOCK-IFDMA
CHANNEL ESTIMATION FOR BLOCK-IFDMA Anja Sohl, Tobias Frank, and Anja Klein Darmstadt University of Technology Communications Engineering Lab Merckstr. 25, 64283 Darmstadt, Germany a.sohl,t.frank,a.klein}@nt.tu-darmstadt.de
More informationComparison between Performances of Channel estimation Techniques for CP-LTE and ZP-LTE Downlink Systems
Comparison between Performances of Channel estimation Techniques for CP-LTE and ZP-LTE Downlink Systems Abdelhakim Khlifi 1 and Ridha Bouallegue 2 1 National Engineering School of Tunis, Tunisia abdelhakim.khlifi@gmail.com
More informationChapter 6 Applications. Office Hours: BKD Tuesday 14:00-16:00 Thursday 9:30-11:30
Chapter 6 Applications 1 Office Hours: BKD 3601-7 Tuesday 14:00-16:00 Thursday 9:30-11:30 Chapter 6 Applications 6.1 3G (UMTS and WCDMA) 2 Office Hours: BKD 3601-7 Tuesday 14:00-16:00 Thursday 9:30-11:30
More information(COMPUTER NETWORKS & COMMUNICATION PROTOCOLS) Ali kamil Khairullah Number:
(COMPUTER NETWORKS & COMMUNICATION PROTOCOLS) Ali kamil Khairullah Number: 15505071 22-12-2016 Downlink transmission is based on Orthogonal Frequency Division Multiple Access (OFDMA) which converts the
More informationNew Cross-layer QoS-based Scheduling Algorithm in LTE System
New Cross-layer QoS-based Scheduling Algorithm in LTE System MOHAMED A. ABD EL- MOHAMED S. EL- MOHSEN M. TATAWY GAWAD MAHALLAWY Network Planning Dep. Network Planning Dep. Comm. & Electronics Dep. National
More informationBroadband OFDM-FDMA System for the Uplink of a Wireless LAN
Broadband OFDM-FDMA System for the Uplink of a Wireless LAN Dirk Galda and Hermann Rohling Department of Telecommunications,TU of Hamburg-Harburg Eißendorfer Straße 40, 21073 Hamburg, Germany Elena Costa,
More informationA Practical Resource Allocation Approach for Interference Management in LTE Uplink Transmission
JOURNAL OF COMMUNICATIONS, VOL. 6, NO., JULY A Practical Resource Allocation Approach for Interference Management in LTE Uplink Transmission Liying Li, Gang Wu, Hongbing Xu, Geoffrey Ye Li, and Xin Feng
More informationProposal for Incorporating Single-carrier FDMA into m
Proposal for Incorporating Single-carrier FDMA into 802.16m IEEE 802.16 Presentation Submission Document Number: IEEE S802.16m-08/100 Date Submitted: 2008-01-18 Source: Jianfeng Kang, Adrian Boariu, Shaohua
More informationSummary of the PhD Thesis
Summary of the PhD Thesis Contributions to LTE Implementation Author: Jamal MOUNTASSIR 1. Introduction The evolution of wireless networks process is an ongoing phenomenon. There is always a need for high
More informationMulti-Carrier Systems
Wireless Information Transmission System Lab. Multi-Carrier Systems 2006/3/9 王森弘 Institute of Communications Engineering National Sun Yat-sen University Outline Multi-Carrier Systems Overview Multi-Carrier
More informationPart 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
More informationLevel 6 Graduate Diploma in Engineering Wireless and mobile communications
9210-119 Level 6 Graduate Diploma in Engineering Wireless and mobile communications Sample Paper You should have the following for this examination one answer book non-programmable calculator pen, pencil,
More informationExperimenting 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
More informationPlanning of LTE Radio Networks in WinProp
Planning of LTE Radio Networks in WinProp AWE Communications GmbH Otto-Lilienthal-Str. 36 D-71034 Böblingen mail@awe-communications.com Issue Date Changes V1.0 Nov. 2010 First version of document V2.0
More informationPerformance and Complexity Comparison of Channel Estimation Algorithms for OFDM System
Performance and Complexity Comparison of Channel Estimation Algorithms for OFDM System Saqib Saleem 1, Qamar-Ul-Islam 2 Department of Communication System Engineering Institute of Space Technology Islamabad,
More informationInterference management Within 3GPP LTE advanced
Interference management Within 3GPP LTE advanced Konstantinos Dimou, PhD Senior Research Engineer, Wireless Access Networks, Ericsson research konstantinos.dimou@ericsson.com 2013-02-20 Outline Introduction
More informationCHANNEL ESTIMATION FOR LTE UPLINK SYSTEM BY PERCEPTRON NEURAL NETWORK
CHANNEL ESTIMATION FOR LTE UPLINK SYSTEM BY PERCEPTRON NEURAL NETWORK A. Omri 1, R. Bouallegue 2, R. Hamila 3 and M. Hasna 4. 1 and 2 Laboratory 6 Tel @ Higher School of Telecommunication of Tunis. 1 omriaymen@qu.edu.qa,
More informationFrom 2G to 4G UE Measurements from GSM to LTE. David Hall RF Product Manager
From 2G to 4G UE Measurements from GSM to LTE David Hall RF Product Manager Agenda: Testing 2G to 4G Devices The progression of standards GSM/EDGE measurements WCDMA measurements LTE Measurements LTE theory
More informationLecture LTE (4G) -Technologies used in 4G and 5G. Spread Spectrum Communications
COMM 907: Spread Spectrum Communications Lecture 10 - LTE (4G) -Technologies used in 4G and 5G The Need for LTE Long Term Evolution (LTE) With the growth of mobile data and mobile users, it becomes essential
More informationSOCP Approach for Reducing PAPR System SC- FDMA in Uplink via Tone Reservation
SOCP Approach for Reducing PAPR System SC- FDMA in Uplink via Tone Reservation Zid Souad 1 and Bouallegue Ridha 2 1 National Engineering School of Tunis, Tunisia zidsouad@gmail.com 2 SUP COM, 6 Tel Laboratory,
More informationPerformance analysis of MISO-OFDM & MIMO-OFDM Systems
Performance analysis of MISO-OFDM & MIMO-OFDM Systems Kavitha K V N #1, Abhishek Jaiswal *2, Sibaram Khara #3 1-2 School of Electronics Engineering, VIT University Vellore, Tamil Nadu, India 3 Galgotias
More informationSIMULATION OF LTE DOWNLINK SIGNAL
U.P.B. Sci. Bull., Series C, Vol. 75, Iss. 4, 2013 ISSN 2286 3540 SIMULATION OF LTE DOWNLINK SIGNAL Andrei Vasile IORDACHE 1 This paper investigates the effect of SINR in LTE downlink transmission. 3GPP
More informationOrthogonal 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 ---------------------------------------------------------------------***----------------------------------------------------------------------
More informationPerformance 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
More informationMulti-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
More informationPAPR Reduction in 4G Cellular Network: A SLM-based IFDMA Uplink System
Proceedings of the Pakistan Academy of Sciences 49 (2): 79-84 (2012) Copyright Pakistan Academy of Sciences ISSN: 0377-2969 Pakistan Academy of Sciences Original Article PAPR Reduction in 4G Cellular Network:
More informationSingle Carrier Multi-Tone Modulation Scheme
Single Carrier Multi-Tone Modulation Scheme Roman M. Vitenberg Guarneri Communications Ltd, Israel roman@guarneri-communications.com Abstract In this paper, we propose a modulation scheme, which can improve
More informationPerformance of Orthogonal Frequency Division Multiplexing System Based on Mobile Velocity and Subcarrier
Journal of Computer Science 6 (): 94-98, 00 ISSN 549-3636 00 Science Publications Performance of Orthogonal Frequency Division Multiplexing System ased on Mobile Velocity and Subcarrier Zulkeflee in halidin
More information(LTE Fundamental) LONG TERMS EVOLUTION
(LTE Fundamental) LONG TERMS EVOLUTION 1) - LTE Introduction 1.1: Overview and Objectives 1.2: User Expectation 1.3: Operator expectation 1.4: Mobile Broadband Evolution: the roadmap from HSPA to LTE 1.5:
More informationCarrier Frequency Synchronization in OFDM-Downlink LTE Systems
Carrier Frequency Synchronization in OFDM-Downlink LTE Systems Patteti Krishna 1, Tipparthi Anil Kumar 2, Kalithkar Kishan Rao 3 1 Department of Electronics & Communication Engineering SVSIT, Warangal,
More informationWireless Networks: An Introduction
Wireless Networks: An Introduction Master Universitario en Ingeniería de Telecomunicación I. Santamaría Universidad de Cantabria Contents Introduction Cellular Networks WLAN WPAN Conclusions Wireless Networks:
More informationPerformance and Complexity Comparison of Channel Estimation Algorithms for OFDM System
International Journal of Electrical & Computer Sciences IJECS-IJENS Vol: 11 No: 02 6 Performance and Complexity Comparison of Channel Estimation Algorithms for OFDM System Saqib Saleem 1, Qamar-Ul-Islam
More informationLecture 12: Summary Advanced Digital Communications (EQ2410) 1
: Advanced Digital Communications (EQ2410) 1 Monday, Mar. 7, 2016 15:00-17:00, B23 1 Textbook: U. Madhow, Fundamentals of Digital Communications, 2008 1 / 15 Overview 1 2 3 4 2 / 15 Equalization Maximum
More informationECE5984 Orthogonal Frequency Division Multiplexing and Related Technologies Fall Mohamed Essam Khedr. Channel Estimation
ECE5984 Orthogonal Frequency Division Multiplexing and Related Technologies Fall 2007 Mohamed Essam Khedr Channel Estimation Matlab Assignment # Thursday 4 October 2007 Develop an OFDM system with the
More informationBER 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
More informationOrthogonal 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
More informationOFDM 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
More informationAnalysis 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
More informationADAPTIVITY IN MC-CDMA SYSTEMS
ADAPTIVITY IN MC-CDMA SYSTEMS Ivan Cosovic German Aerospace Center (DLR), Inst. of Communications and Navigation Oberpfaffenhofen, 82234 Wessling, Germany ivan.cosovic@dlr.de Stefan Kaiser DoCoMo Communications
More informationIMPROVED CHANNEL ESTIMATION FOR OFDM BASED WLAN SYSTEMS. G.V.Rangaraj M.R.Raghavendra K.Giridhar
IMPROVED CHANNEL ESTIMATION FOR OFDM BASED WLAN SYSTEMS GVRangaraj MRRaghavendra KGiridhar Telecommunication and Networking TeNeT) Group Department of Electrical Engineering Indian Institute of Technology
More informationPhysical Layer Frame Structure in 4G LTE/LTE-A Downlink based on LTE System Toolbox
IOSR Journal of Electronics and Communication Engineering (IOSR-JECE) e-issn: 2278-2834,p- ISSN: 2278-8735.Volume 1, Issue 3, Ver. IV (May - Jun.215), PP 12-16 www.iosrjournals.org Physical Layer Frame
More informationMobile Data Communication Terminals Compatible with Xi (Crossy) LTE Service
Mobile Data Communication Terminals Compatible with Xi (Crossy) LTE Service LTE Data communication terminal Throughput Special Articles on Xi (Crossy) LTE Service Toward Smart Innovation Mobile Data Communication
More informationLecture 3 Cellular Systems
Lecture 3 Cellular Systems I-Hsiang Wang ihwang@ntu.edu.tw 3/13, 2014 Cellular Systems: Additional Challenges So far: focus on point-to-point communication In a cellular system (network), additional issues
More informationChapter 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
More informationFilter Bank Multi-Carrier (FBMC) for Future Wireless Systems
Filter Bank Multi-Carrier (FBMC) for Future Wireless Systems CD Laboratory Workshop Ronald Nissel November 15, 2016 Motivation Slide 2 / 27 Multicarrier Modulation Frequency index, l 17 0 0 x l,k...transmitted
More informationA Smart Grid System Based On Cloud Cognitive Radio Using Beamforming Approach In Wireless Sensor Network
IOSR Journal of Electronics and Communication Engineering (IOSR-JECE) e-issn: 2278-2834,p- ISSN: 2278-8735 PP 48-53 www.iosrjournals.org A Smart Grid System Based On Cloud Cognitive Radio Using Beamforming
More informationAdvances in Radio Science
Advances in Radio Science, 3, 1 6, 2005 SRef-ID: 1684-9973/ars/2005-3-1 Copernicus GmbH 2005 Advances in Radio Science Robustness of IFDMA as Air Interface Candidate for Future High Rate Mobile Radio Systems
More informationSC - 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
More informationICI Mitigation for Mobile OFDM with Application to DVB-H
ICI Mitigation for Mobile OFDM with Application to DVB-H Outline Background and Motivation Coherent Mobile OFDM Detection DVB-H System Description Hybrid Frequency/Time-Domain Channel Estimation Conclusions
More informationPerformance Comparison of OFDMA and MC-CDMA in Mimo Downlink LTE Technology
Performance Comparison of OFDMA and MC-CDMA in Mimo Downlink LTE Technology D.R.Srinivas, M.Tech Associate Profesor, Dept of ECE, G.Pulla Reddy Engineering College, Kurnool. GKE Sreenivasa Murthy, M.Tech
More informationLecture 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,
More information2-2 Advanced Wireless Packet Cellular System using Multi User OFDM- SDMA/Inter-BTS Cooperation with 1.3 Gbit/s Downlink Capacity
2-2 Advanced Wireless Packet Cellular System using Multi User OFDM- SDMA/Inter-BTS Cooperation with 1.3 Gbit/s Downlink Capacity KAWAZAWA Toshio, INOUE Takashi, FUJISHIMA Kenzaburo, TAIRA Masanori, YOSHIDA
More informationSNS COLLEGE OF ENGINEERING COIMBATORE DEPARTMENT OF INFORMATION TECHNOLOGY QUESTION BANK
SNS COLLEGE OF ENGINEERING COIMBATORE 641107 DEPARTMENT OF INFORMATION TECHNOLOGY QUESTION BANK EC6801 WIRELESS COMMUNICATION UNIT-I WIRELESS CHANNELS PART-A 1. What is propagation model? 2. What are the
More information3G long-term evolution
3G long-term evolution by Stanislav Nonchev e-mail : stanislav.nonchev@tut.fi 1 2006 Nokia Contents Radio network evolution HSPA concept OFDM adopted in 3.9G Scheduling techniques 2 2006 Nokia 3G long-term
More informationSC-FDMA LTE Performance through High Altitude Platforms Communications (HAPS) Channel
TELKOMNIKA, Vol.14, No.2, June 2016, pp. 515~522 ISSN: 1693-6930, accredited A by DIKTI, Decree No: 58/DIKTI/Kep/2013 DOI: 10.12928/TELKOMNIKA.v14i1.2646 515 SC-FDMA LTE Performance through High Altitude
More informationInvestigation on Multiple Antenna Transmission Techniques in Evolved UTRA. OFDM-Based Radio Access in Downlink. Features of Evolved UTRA and UTRAN
Evolved UTRA and UTRAN Investigation on Multiple Antenna Transmission Techniques in Evolved UTRA Evolved UTRA (E-UTRA) and UTRAN represent long-term evolution (LTE) of technology to maintain continuous
More informationAnalysis and Improvements of Linear Multi-user user MIMO Precoding Techniques
1 Analysis and Improvements of Linear Multi-user user MIMO Precoding Techniques Bin Song and Martin Haardt Outline 2 Multi-user user MIMO System (main topic in phase I and phase II) critical problem Downlink
More informationMultiple Access Techniques
Multiple Access Techniques Instructor: Prof. Dr. Noor M. Khan Department of Electrical Engineering, Faculty of Engineering, Mohammad Ali Jinnah University, Islamabad Campus, Islamabad, PAKISTAN Ph: +92
More informationPerformance Study of MIMO-OFDM System in Rayleigh Fading Channel with QO-STB Coding Technique
e-issn 2455 1392 Volume 2 Issue 6, June 2016 pp. 190 197 Scientific Journal Impact Factor : 3.468 http://www.ijcter.com Performance Study of MIMO-OFDM System in Rayleigh Fading Channel with QO-STB Coding
More informationSPARSE CHANNEL ESTIMATION BY PILOT ALLOCATION IN MIMO-OFDM SYSTEMS
SPARSE CHANNEL ESTIMATION BY PILOT ALLOCATION IN MIMO-OFDM SYSTEMS Puneetha R 1, Dr.S.Akhila 2 1 M. Tech in Digital Communication B M S College Of Engineering Karnataka, India 2 Professor Department of
More informationOFDMA and MIMO Notes
OFDMA and MIMO Notes EE 442 Spring Semester Lecture 14 Orthogonal Frequency Division Multiplexing (OFDM) is a digital multi-carrier modulation technique extending the concept of single subcarrier modulation
More informationPilot Aided Channel Estimation for MIMO MC-CDMA
Pilot Aided Channel Estimation for MIMO MC-CDMA Stephan Sand (DLR) Fabrice Portier CNRS/IETR NEWCOM Dept. 1, SWP 2, Barcelona, Spain, 3 rd November, 2005 Outline System model Frame structure MIMO Pilot
More informationAn 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
More informationPractical 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
More informationENHANCED BANDWIDTH EFFICIENCY IN WIRELESS OFDMA SYSTEMS THROUGH ADAPTIVE SLOT ALLOCATION ALGORITHM
ENHANCED BANDWIDTH EFFICIENCY IN WIRELESS OFDMA SYSTEMS THROUGH ADAPTIVE SLOT ALLOCATION ALGORITHM K.V. N. Kavitha 1, Siripurapu Venkatesh Babu 1 and N. Senthil Nathan 2 1 School of Electronics Engineering,
More informationEnhanced Channel Estimation Based On Basis Expansion Using Slepian Sequences for Time Varying OFDM Systems
Enhanced Channel Estimation Based On Basis Expansion Using Slepian Sequences for Time Varying OFDM Systems Rashmi Aun Hukkeri PG Student, EXTC,Saraswati College of Engg. Navi Mumbai, Maharashtra, India
More informationNext Generation Synthetic Aperture Radar Imaging
Next Generation Synthetic Aperture Radar Imaging Xiang-Gen Xia Department of Electrical and Computer Engineering University of Delaware Newark, DE 19716, USA Email: xxia@ee.udel.edu This is a joint work
More informationMassive MIMO: Signal Structure, Efficient Processing, and Open Problems I
Massive MIMO: Signal Structure, Efficient Processing, and Open Problems I Saeid Haghighatshoar Communications and Information Theory Group (CommIT) Technische Universität Berlin CoSIP Winter Retreat Berlin,
More informationBasic idea: divide spectrum into several 528 MHz bands.
IEEE 802.15.3a Wireless Information Transmission System Lab. Institute of Communications Engineering g National Sun Yat-sen University Overview of Multi-band OFDM Basic idea: divide spectrum into several
More informationCOMPARISON OF LOCALIZED, INTERLEAVED AND BLOCK-INTERLEAVED FDMA IN TERMS OF PILOT MULTIPLEXING AND CHANNEL ESTIMATION
COMPARISON OF LOCALIZED, INTERLEAVED AND BLOCK-INTERLEAVED FDMA IN TERMS OF PILOT MULTIPLEXING AND CHANNEL ESTIMATION Anja Sohl and Anja Klein Darmstadt University of Technology Communications Engineering
More informationIEEE Broadband Wireless Access Working Group <
Project IEEE 802.6 Broadband Wireless Access Working Group Title Proposal for Incorporating Single-carrier FDMA into 802.6m Date Submitted Source(s) 2007--07 Jianfeng Kang, Adrian
More informationABSTRACT PERFORMANCE EVALUATION OF SUBCARRIER MAPPING TECHNIQUES FOR MULTIUSER IN PRESENCE OF DOPPLER IN LTE UPLINK
ABSTRACT PERFORMANCE EVALUATION OF SUBCARRIER MAPPING TECHNIQUES FOR MULTIUSER IN PRESENCE OF DOPPLER IN LTE UPLINK Kushal Kumar Ponugoti, M.S. Department of Electrical Engineering Northern Illinois University,
More informationA 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,
More informationINTERFERENCE SELF CANCELLATION IN SC-FDMA SYSTEMS -A CAMPARATIVE STUDY
INTERFERENCE SELF CANCELLATION IN SC-FDMA SYSTEMS -A CAMPARATIVE STUDY Ms Risona.v 1, Dr. Malini Suvarna 2 1 M.Tech Student, Department of Electronics and Communication Engineering, Mangalore Institute
More informationRashad Irshad. MSC Radio and Mobile Communications. University of Hertfordshire, UK
SC-FDMA Technique for LTE Systems Rashad Irshad MSC Radio and Mobile Communications University of Hertfordshire, UK Abstract:- Due to the requirements of high speed and low delays it is very difficult
More informationLecture 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
More informationFrom OFDM to LTE. Fabrizio Tomatis (ST-E) Based on slides from Andrea Ancora (ST-E)
From OFDM to LTE Fabrizio Tomatis (ST-E) Based on slides from Andrea Ancora (ST-E) Introduction OFDM History Principles of Wireless Communications OFDM principles Serial-to-parallel conversion Cyclic prefix
More informationSimulative 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,
More informationMITIGATING 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
More informationEvaluation 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
More informationPerformance Enhancement of Multi User Detection for the MC-CDMA
Performance Enhancement of Multi User Detection for the MC-CDMA Ramabhai Patel M.E., Department of Electronics & Communication, L.D.College of Engineering, Gujarat, India ABSTRACT:The bit error rate of
More informationFREQUENCY 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
More informationBit Error Rate Performance Evaluation of Various Modulation Techniques with Forward Error Correction Coding of WiMAX
Bit Error Rate Performance Evaluation of Various Modulation Techniques with Forward Error Correction Coding of WiMAX Amr Shehab Amin 37-20200 Abdelrahman Taha 31-2796 Yahia Mobasher 28-11691 Mohamed Yasser
More informationChannel Estimation by 2D-Enhanced DFT Interpolation Supporting High-speed Movement
Channel Estimation by 2D-Enhanced DFT Interpolation Supporting High-speed Movement Channel Estimation DFT Interpolation Special Articles on Multi-dimensional MIMO Transmission Technology The Challenge
More information