Wireless Medium Access Control and CDMA-based Communication Lesson 08 Auto-correlation and Barker Codes

Size: px
Start display at page:

Download "Wireless Medium Access Control and CDMA-based Communication Lesson 08 Auto-correlation and Barker Codes"

Transcription

1 Wireless Medium Access Control and CDMA-based Communication Lesson 08 Auto-correlation and Barker Codes 1

2 Coding Methods in CDMA Use distinctive spreading codes to spread the symbols before transmission At the receiving end, a correlator used to despread the original signal Unwanted signals not correlated and, thus, not despread 2

3 CDMA codes The original data rates are called symbols per second and the code chipping rates are called chip rates These codes uniquely distinguish sets of data from each other 3

4 CDMA codes Carefully designed sequences of ones and zeros These sequences are produced from the codes as per the chips at rates much higher than those of the symbols (Spread factor > 1) Example: f s = 19.2 ks/s, f chip = Mchip/s and spread factor = 64 4

5 CDMA codes Enable unique identification of signals from different sources and allow different signals to be transmitted through the same space, time, and frequency slots without interference No correlation to other codes or to time shifted versions of themselves 5

6 Correlation Consider coded symbols of n bits between time interval t 0 and t 0 + (n 1)T, where T is the period between successive bits The sequence at the receiver in the interval between t 0 ' and t 0 '+(n 1)T when (t 0 ' t 0 ) = the propagation delay 6

7 Correlation between Codes When the receiver attempts to correlate the received coded symbols with respect to any of the codes which it internally generates, it is not able to correlate even when it uses exactly the same code as the one used for transmission 7

8 Reasons for no correlation Propagation delay The receiver uses the code for extracting symbols within the interval t 0 " and t 0 "+(n 1)T and t 0 " and t 0 do not differ by n.t Inappropriate code The reason can be that the sequence of bits in the code itself is such that correlation is not possible by using a correlation method at the receiver 8

9 Correlation functions Propagation delay taken care of by the receiver by successively shifting the receiver generated sequence by a period = m. T m = 0, 1, 2, 3,, (n 1) 9

10 Sum of product (SOP) A code symbol a i for i = 0, 1,..., n 2, n 1 is given by the SOP from i = 0 to n k for all values of k between 1 and n SOP = a i.a i+ k 10

11 Correlation Method The correlation method is to find the sum of products (SOP) to correlate the sequence of bits between t 0 " + (m. T) and t 0 " + (n 1)T + (m.t) with the received coded signal Vary m till the SOP is maximum Inappropriate code taken care of by using an autocorrelation code 11

12 Autocorrelation code A multi-bit code which, when used for coding the symbols before a transmission, enables the receiver to automatically correlate and extract the symbols using the correlation method SOP = a i.a i+ k 1 for i = 1 k < n SOP maximum when k = 0 12

13 Example Barker code Assume that the chipping signal symbol is 1 for +1 and 0 for 1 The Barker code is a sequence of n values (code-symbols) of +1 and 1 {+1, +1, +1, 1, 1, 1, +1, 1, 1, +1, 1} 11-bit Code in LAN 13

14 13-bit Barker code C13 {+1, +1, +1, +1, +1, 1, 1, +1, +1, 1, +1, 1, +1} 14

15 Good autocorrelation function Gives a large value of sum e i r i when e i = r i A very low value, when e i r i for 0 i < n e i = expected chip symbol and r i = received chip symbol in an i th sequence at the receiver 15

16 Pseudo-noise (PN) sequence The code appears random and noise-like but is actually not random 16

17 Sum of the 13 products between the coded and received sequences for n = 13 17

18 Summary Correlation defined by a large value of sum e i r i when e i = r i and a very low value, when e i r i for 0 i < n Correlation method is to successively shift the code by 1 till e i = r i shown by maximum value of SOP for all values of i Barker code autocorrelation code Pseudo-noise code 18

19 End of Lesson 08 Auto-correlation and Barker Codes 19

Code Division Multiple Access.

Code Division Multiple Access. Code Division Multiple Access Mobile telephony, using the concept of cellular architecture, are built based on GSM (Global System for Mobile communication) and IS-95(Intermediate Standard-95). CDMA allows

More information

Wireless Medium Access Control and CDMA-based Communication Lesson 16 Orthogonal Frequency Division Medium Access (OFDM)

Wireless Medium Access Control and CDMA-based Communication Lesson 16 Orthogonal Frequency Division Medium Access (OFDM) Wireless Medium Access Control and CDMA-based Communication Lesson 16 Orthogonal Frequency Division Medium Access (OFDM) 1 4G File transfer at 10 Mbps High resolution 1024 1920 pixel hi-vision picture

More information

Multiple Access Techniques for Wireless Communications

Multiple Access Techniques for Wireless Communications Multiple Access Techniques for Wireless Communications Contents 1. Frequency Division Multiple Access (FDMA) 2. Time Division Multiple Access (TDMA) 3. Code Division Multiple Access (CDMA) 4. Space Division

More information

Lecture 3. Direct Sequence Spread Spectrum Systems. COMM 907:Spread Spectrum Communications

Lecture 3. Direct Sequence Spread Spectrum Systems. COMM 907:Spread Spectrum Communications COMM 907: Spread Spectrum Communications Lecture 3 Direct Sequence Spread Spectrum Systems Performance of DSSSS with BPSK Modulation in presence of Interference (Jamming) Broadband Interference (Jamming):

More information

Laboratory 5: Spread Spectrum Communications

Laboratory 5: Spread Spectrum Communications Laboratory 5: Spread Spectrum Communications Cory J. Prust, Ph.D. Electrical Engineering and Computer Science Department Milwaukee School of Engineering Last Update: 19 September 2018 Contents 0 Laboratory

More information

Multiple Access Schemes

Multiple Access Schemes Multiple Access Schemes Dr Yousef Dama Faculty of Engineering and Information Technology An-Najah National University 2016-2017 Why Multiple access schemes Multiple access schemes are used to allow many

More information

CHAPTER 2. Instructor: Mr. Abhijit Parmar Course: Mobile Computing and Wireless Communication ( )

CHAPTER 2. Instructor: Mr. Abhijit Parmar Course: Mobile Computing and Wireless Communication ( ) CHAPTER 2 Instructor: Mr. Abhijit Parmar Course: Mobile Computing and Wireless Communication (2170710) Syllabus Chapter-2.4 Spread Spectrum Spread Spectrum SS was developed initially for military and intelligence

More information

Wireless Medium Access Control and CDMA-based Communication Lesson 14 CDMA2000

Wireless Medium Access Control and CDMA-based Communication Lesson 14 CDMA2000 Wireless Medium Access Control and CDMA-based Communication Lesson 14 CDMA2000 1 CDMA2000 400 MHz, 800 MHz, 900 MHz, 1700 MHz, 1800 MHz, 1900 MHz, and 2100 MHz Compatible with the cdmaone standard A set

More information

Spread Spectrum Modulation

Spread Spectrum Modulation Spread Spectrum Modulation A collective class of signaling techniques are employed before transmitting a signal to provide a secure communication, known as the Spread Spectrum Modulation. The main advantage

More information

Lecture 9: Spread Spectrum Modulation Techniques

Lecture 9: Spread Spectrum Modulation Techniques Lecture 9: Spread Spectrum Modulation Techniques Spread spectrum (SS) modulation techniques employ a transmission bandwidth which is several orders of magnitude greater than the minimum required bandwidth

More information

T325 Summary T305 T325 B BLOCK 3 4 PART III T325. Session 11 Block III Part 3 Access & Modulation. Dr. Saatchi, Seyed Mohsen.

T325 Summary T305 T325 B BLOCK 3 4 PART III T325. Session 11 Block III Part 3 Access & Modulation. Dr. Saatchi, Seyed Mohsen. T305 T325 B BLOCK 3 4 PART III T325 Summary Session 11 Block III Part 3 Access & Modulation [Type Dr. Saatchi, your address] Seyed Mohsen [Type your phone number] [Type your e-mail address] Prepared by:

More information

Required Background (You must satisfy All of the following requirements ) BSEE GPA>3 for technical Courses

Required Background (You must satisfy All of the following requirements ) BSEE GPA>3 for technical Courses Syllabus of EL6033 Grading Policy Midterm Exam: 35% Final Exam: 35% Homework and Class Participation (email discussions): 30% Required Background (You must satisfy All of the following requirements ) BSEE

More information

Spread Spectrum. Chapter 18. FHSS Frequency Hopping Spread Spectrum DSSS Direct Sequence Spread Spectrum DSSS using CDMA Code Division Multiple Access

Spread Spectrum. Chapter 18. FHSS Frequency Hopping Spread Spectrum DSSS Direct Sequence Spread Spectrum DSSS using CDMA Code Division Multiple Access Spread Spectrum Chapter 18 FHSS Frequency Hopping Spread Spectrum DSSS Direct Sequence Spread Spectrum DSSS using CDMA Code Division Multiple Access Single Carrier The traditional way Transmitted signal

More information

Noise Effective Code Analysis on the Basis of Correlation in CDMA Technology

Noise Effective Code Analysis on the Basis of Correlation in CDMA Technology Manarat International University Studies, 2 (1): 183-191, December 2011 ISSN 1815-6754 @ Manarat International University, 2011 Noise Effective Code Analysis on the Basis of Correlation in CDMA Technology

More information

SPREADING CODES 1. INTRODUCTION. Ion POPA Societatea Română de Televiziune Studioul Teritorial Iaşi

SPREADING CODES 1. INTRODUCTION. Ion POPA Societatea Română de Televiziune Studioul Teritorial Iaşi SPREADING CODES Ion POPA Societatea Română de Televiziune Studioul Teritorial Iaşi REZUMAT. În această lucrare am realizat un studiu al codurilor de împrăştiere pe baza caruia am conceput mai multe programe

More information

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 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 information

CDMA - QUESTIONS & ANSWERS

CDMA - QUESTIONS & ANSWERS CDMA - QUESTIONS & ANSWERS http://www.tutorialspoint.com/cdma/questions_and_answers.htm Copyright tutorialspoint.com 1. What is CDMA? CDMA stands for Code Division Multiple Access. It is a wireless technology

More information

Spread Spectrum: Definition

Spread Spectrum: Definition Spread Spectrum: Definition refers to the expansion of signal bandwidth, by several orders of magnitude in some cases, which occurs when a key is attached to the communication channel an RF communications

More information

Performance Analysis of DSSS and FHSS Techniques over AWGN Channel

Performance Analysis of DSSS and FHSS Techniques over AWGN Channel Performance Analysis of DSSS and FHSS Techniques over AWGN Channel M. Katta Swamy, M.Deepthi, V.Mounika, R.N.Saranya Vignana Bharathi Institute of Technology, Hyderabad, and Andhra Pradesh, India. Corresponding

More information

ECS455: Chapter 4 Multiple Access

ECS455: Chapter 4 Multiple Access ECS455: Chapter 4 Multiple Access 4.4 DS/SS 1 Dr.Prapun Suksompong prapun.com/ecs455 Office Hours: BKD 3601-7 Tuesday 9:30-10:30 Tuesday 13:30-14:30 Thursday 13:30-14:30 Spread spectrum (SS) Historically

More information

SPREADING CODES PERFORMANCE FOR CORRELATION FUNCTION USING MATLAB

SPREADING CODES PERFORMANCE FOR CORRELATION FUNCTION USING MATLAB International Journal of Electronics, Communication & Instrumentation Engineering Research and Development (IJECIERD) ISSN 2249-684X Vol. 3, Issue 2, Jun 2013, 15-24 TJPRC Pvt. Ltd. SPREADING CODES PERFORMANCE

More information

Spread Spectrum Signal for Digital Communications

Spread Spectrum Signal for Digital Communications Wireless Information Transmission System Lab. Spread Spectrum Signal for Digital Communications Institute of Communications Engineering National Sun Yat-sen University Multiple Access Schemes Table of

More information

Spread Spectrum (SS) is a means of transmission in which the signal occupies a

Spread Spectrum (SS) is a means of transmission in which the signal occupies a SPREAD-SPECTRUM SPECTRUM TECHNIQUES: A BRIEF OVERVIEW SS: AN OVERVIEW Spread Spectrum (SS) is a means of transmission in which the signal occupies a bandwidth in excess of the minimum necessary to send

More information

Chapter 7 Spread-Spectrum Modulation

Chapter 7 Spread-Spectrum Modulation Chapter 7 Spread-Spectrum Modulation Spread Spectrum Technique simply consumes spectrum in excess of the minimum spectrum necessary to send the data. 7.1 Introduction o Definition of spread-spectrum modulation

More information

ECS455: Chapter 4 Multiple Access

ECS455: Chapter 4 Multiple Access ECS455: Chapter 4 Multiple Access 4.4 DS/SS 1 Dr.Prapun Suksompong prapun.com/ecs455 Office Hours: BKD 3601-7 Wednesday 15:30-16:30 Friday 9:30-10:30 Spread spectrum (SS) Historically spread spectrum was

More information

Chapter 2 Direct-Sequence Systems

Chapter 2 Direct-Sequence Systems Chapter 2 Direct-Sequence Systems A spread-spectrum signal is one with an extra modulation that expands the signal bandwidth greatly beyond what is required by the underlying coded-data modulation. Spread-spectrum

More information

SC - Single carrier systems One carrier carries data stream

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

More information

ECE 5325/6325: Wireless Communication Systems Lecture Notes, Spring 2013

ECE 5325/6325: Wireless Communication Systems Lecture Notes, Spring 2013 ECE 5325/6325: Wireless Communication Systems Lecture Notes, Spring 2013 Lecture 17 Today: Spread Spectrum: (1) Frequency Hopping, (2) Direct Sequence Reading: Today Molisch 18.1, 18.2. Thu: MUSE Channel

More information

Cross Spectral Density Analysis for Various Codes Suitable for Spread Spectrum under AWGN conditions with Error Detecting Code

Cross Spectral Density Analysis for Various Codes Suitable for Spread Spectrum under AWGN conditions with Error Detecting Code Cross Spectral Density Analysis for Various Codes Suitable for Spread Spectrum under AWG conditions with Error Detecting Code CH.ISHATHI 1, R.SUDAR RAJA 2 Department of Electronics and Communication Engineering,

More information

Ternary Zero Correlation Zone Sequences for Multiple Code UWB

Ternary Zero Correlation Zone Sequences for Multiple Code UWB Ternary Zero Correlation Zone Sequences for Multiple Code UWB Di Wu, Predrag Spasojević and Ivan Seskar WINLAB, Rutgers University 73 Brett Road, Piscataway, NJ 8854 {diwu,spasojev,seskar}@winlabrutgersedu

More information

Basics of Spread Spectrum Systems

Basics of Spread Spectrum Systems IMPERIAL COLLEGE LONDON, DEPARTMENT of ELECTRICAL and ELECTRONIC ENGINEERING. COMPACT LECTURE NOTES on COMMUNICATION SYSTEMS. Prof. Athanassios Manikas, Autumn 2007 Basics of Spread Spectrum Systems 1.

More information

Chapter 7 Spread-Spectrum Modulation

Chapter 7 Spread-Spectrum Modulation Chapter 7 Spread-Spectrum Modulation Spread Spectrum Technique simply consumes spectrum in excess of the minimum spectrum necessary to send the data. 7.1 Introduction Definition of spread-spectrum modulation

More information

Chapter 7. Multiple Division Techniques

Chapter 7. Multiple Division Techniques Chapter 7 Multiple Division Techniques 1 Outline Frequency Division Multiple Access (FDMA) Division Multiple Access (TDMA) Code Division Multiple Access (CDMA) Comparison of FDMA, TDMA, and CDMA Walsh

More information

ABHELSINKI UNIVERSITY OF TECHNOLOGY

ABHELSINKI UNIVERSITY OF TECHNOLOGY CDMA receiver algorithms 14.2.2006 Tommi Koivisto tommi.koivisto@tkk.fi CDMA receiver algorithms 1 Introduction Outline CDMA signaling Receiver design considerations Synchronization RAKE receiver Multi-user

More information

Medium Access Control

Medium Access Control CMPE 477 Wireless and Mobile Networks Medium Access Control Motivation for Wireless MAC SDMA FDMA TDMA CDMA Comparisons CMPE 477 Motivation Can we apply media access methods from fixed networks? Example

More information

Multi-Carrier Systems

Multi-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 information

Mobile Computing. Chapter 3: Medium Access Control

Mobile Computing. Chapter 3: Medium Access Control Mobile Computing Chapter 3: Medium Access Control Prof. Sang-Jo Yoo Contents Motivation Access methods SDMA/FDMA/TDMA Aloha Other access methods Access method CDMA 2 1. Motivation Can we apply media access

More information

Reti di Telecomunicazione. Channels and Multiplexing

Reti di Telecomunicazione. Channels and Multiplexing Reti di Telecomunicazione Channels and Multiplexing Point-to-point Channels They are permanent connections between a sender and a receiver The receiver can be designed and optimized based on the (only)

More information

Initial Synchronization

Initial Synchronization Wireless Information Transmission System Lab. Initial Synchronization Institute of Communications Engineering National Sun Yat-sen University Contents Introduction and Over-sampling Downlink Synchronization

More information

Simulation of Optical CDMA using OOC Code

Simulation of Optical CDMA using OOC Code International Journal of Scientific and Research Publications, Volume 2, Issue 5, May 22 ISSN 225-353 Simulation of Optical CDMA using OOC Code Mrs. Anita Borude, Prof. Shobha Krishnan Department of Electronics

More information

Multiplexing Module W.tra.2

Multiplexing Module W.tra.2 Multiplexing Module W.tra.2 Dr.M.Y.Wu@CSE Shanghai Jiaotong University Shanghai, China Dr.W.Shu@ECE University of New Mexico Albuquerque, NM, USA 1 Multiplexing W.tra.2-2 Multiplexing shared medium at

More information

Wireless Transmission & Media Access

Wireless Transmission & Media Access Wireless Transmission & Media Access Signals and Signal Propagation Multiplexing Modulation Media Access 1 Significant parts of slides are based on original material by Prof. Dr.-Ing. Jochen Schiller,

More information

EEE 309 Communication Theory

EEE 309 Communication Theory EEE 309 Communication Theory Semester: January 2016 Dr. Md. Farhad Hossain Associate Professor Department of EEE, BUET Email: mfarhadhossain@eee.buet.ac.bd Office: ECE 331, ECE Building Part 08 Multiplexing

More information

Medium Access Schemes

Medium Access Schemes Medium Access Schemes Winter Semester 2010/11 Integrated Communication Systems Group Ilmenau University of Technology Media Access: Motivation The problem: multiple users compete for a common, shared resource

More information

Spread spectrum. Outline : 1. Baseband 2. DS/BPSK Modulation 3. CDM(A) system 4. Multi-path 5. Exercices. Exercise session 7 : Spread spectrum 1

Spread spectrum. Outline : 1. Baseband 2. DS/BPSK Modulation 3. CDM(A) system 4. Multi-path 5. Exercices. Exercise session 7 : Spread spectrum 1 Spread spectrum Outline : 1. Baseband 2. DS/BPSK Modulation 3. CDM(A) system 4. Multi-path 5. Exercices Exercise session 7 : Spread spectrum 1 1. Baseband +1 b(t) b(t) -1 T b t Spreading +1-1 T c t m(t)

More information

SPREAD SPECTRUM (SS) SIGNALS FOR DIGITAL COMMUNICATIONS

SPREAD SPECTRUM (SS) SIGNALS FOR DIGITAL COMMUNICATIONS Dr. Ali Muqaibel SPREAD SPECTRUM (SS) SIGNALS FOR DIGITAL COMMUNICATIONS VERSION 1.1 Dr. Ali Hussein Muqaibel 1 Introduction Narrow band signal (data) In Spread Spectrum, the bandwidth W is much greater

More information

Communications Theory and Engineering

Communications Theory and Engineering Communications Theory and Engineering Master's Degree in Electronic Engineering Sapienza University of Rome A.A. 2018-2019 TDMA, FDMA, CDMA (cont d) and the Capacity of multi-user channels Code Division

More information

ECS455: Chapter 4 Multiple Access

ECS455: Chapter 4 Multiple Access ECS455: Chapter 4 Multiple Access 4.9 Async. CDMA: Gold codes and GPS 1 Dr.Prapun Suksompong prapun.com/ecs455 Office Hours: BKD 3601-7 Tuesday 9:30-10:30 Tuesday 13:30-14:30 Thursday 13:30-14:30 Asynchronous

More information

Satellite Telemetry Data Transmission Immunity from the ASI and Jamming Using DSSS Optimized PN Codes in DS-CDMA Systems

Satellite Telemetry Data Transmission Immunity from the ASI and Jamming Using DSSS Optimized PN Codes in DS-CDMA Systems IOSR Journal of Electronics and Communication Engineering (IOSR-JECE) e-issn: 2278-2834,p- ISSN: 2278-8735.Volume 12, Issue 1, Ver. II (Jan.-Feb. 2017), PP 01-12 www.iosrjournals.org Satellite Telemetry

More information

W-CDMA for UMTS Principles

W-CDMA for UMTS Principles W-CDMA for UMTS Principles Introduction CDMA Background/ History Code Division Multiple Access (CDMA) Why CDMA? CDMA Principles / Spreading Codes Multi-path Radio Channel and Rake Receiver Problems to

More information

Implementation of DSSS System using Chaotic Sequence using MATLAB and VHDL

Implementation of DSSS System using Chaotic Sequence using MATLAB and VHDL 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. 4, Issue. 5, May 2015, pg.598

More information

Spread Spectrum Techniques

Spread Spectrum Techniques 0 Spread Spectrum Techniques Contents 1 1. Overview 2. Pseudonoise Sequences 3. Direct Sequence Spread Spectrum Systems 4. Frequency Hopping Systems 5. Synchronization 6. Applications 2 1. Overview Basic

More information

CDMA is used to a limited extent on the 800-MHz band, but is much more common in the 1900-MHz PCS band. It uses code-division multiple access by

CDMA is used to a limited extent on the 800-MHz band, but is much more common in the 1900-MHz PCS band. It uses code-division multiple access by IS-95 CDMA PCS CDMA Frequency Use CDMA Channels Forward Channel Reverse Channel Voice Coding Mobile Power Control Rake Receivers and Soft handoffs CDMA Security CDMA is used to a limited extent on the

More information

ORTHOGONAL frequency division multiplexing (OFDM)

ORTHOGONAL 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 information

Politecnico di Milano Facoltà di Ingegneria dell Informazione. 3 Basic concepts. Wireless Networks Prof. Antonio Capone

Politecnico di Milano Facoltà di Ingegneria dell Informazione. 3 Basic concepts. Wireless Networks Prof. Antonio Capone Politecnico di Milano Facoltà di Ingegneria dell Informazione 3 Basic concepts Wireless Networks Prof. Antonio Capone Wireless Networks Wireless or wired, what is better? Well, it depends on the situation!

More information

Interference Reduction in Overlaid WCDMA and TDMA Systems

Interference Reduction in Overlaid WCDMA and TDMA Systems JOURNAL OF NETWORKS, VOL. 6, NO. 4, APRIL 2011 587 Interference Reduction in Overlaid WCDMA and TDMA Systems Maan A. S. Al-Adwany 1 & Amin M. Abbosh 2 1 University of Mosul/ College of Electronics Eng.,

More information

COMPARATIVE ANALYSIS OF PEAK CORRELATION CHARACTERISTICS OF NON-ORTHOGONAL SPREADING CODES FOR WIRELESS SYSTEMS

COMPARATIVE ANALYSIS OF PEAK CORRELATION CHARACTERISTICS OF NON-ORTHOGONAL SPREADING CODES FOR WIRELESS SYSTEMS International Journal of Distributed and Parallel Systems (IJDPS) Vol.3, No.3, May 212 COMPARATIVE ANALYSIS OF PEAK CORRELATION CHARACTERISTICS OF NON-ORTHOGONAL SPREADING CODES FOR WIRELESS SYSTEMS Dr.

More information

By Nour Alhariqi. nalhareqi

By Nour Alhariqi. nalhareqi By Nour Alhariqi nalhareqi - 2014 1 Outline Basic background Research work What I have learned nalhareqi - 2014 2 DS-CDMA Technique For years, direct sequence code division multiple access (DS-CDMA) appears

More information

SNR Performance Analysis of Rake Receiver for WCDMA

SNR Performance Analysis of Rake Receiver for WCDMA International Journal of Computational Engineering & Management, Vol. 15 Issue 2, March 2012 www..org SNR Performance Analysis of Rake Receiver for WCDMA 62 Nikhil B. Patel 1 and K. R. Parmar 2 1 Electronics

More information

Low Correlation Zone Signal Sets

Low Correlation Zone Signal Sets Low Correlation Zone Signal Sets Guang Gong Department of Electrical & Computer Engineering University of Waterloo CANADA Joint work with Solomon W. Golomb and Hong-Yeop Song Outline of Presentation Outline

More information

Lecture 8 Mul+user Systems

Lecture 8 Mul+user Systems Wireless Communications Lecture 8 Mul+user Systems Prof. Chun-Hung Liu Dept. of Electrical and Computer Engineering National Chiao Tung University Fall 2014 Outline Multiuser Systems (Chapter 14 of Goldsmith

More information

CDMA Mobile Radio Networks

CDMA Mobile Radio Networks - 1 - CDMA Mobile Radio Networks Elvino S. Sousa Department of Electrical and Computer Engineering University of Toronto Canada ECE1543S - Spring 1999 - 2 - CONTENTS Basic principle of direct sequence

More information

On the Uplink Capacity of Cellular CDMA and TDMA over Nondispersive Channels

On the Uplink Capacity of Cellular CDMA and TDMA over Nondispersive Channels On the Uplink Capacity of Cellular CDMA and TDMA over Nondispersive Channels Hikmet Sari (1), Heidi Steendam (), Marc Moeneclaey () (1) Alcatel Access Systems Division () Communications Engineering Laboratory

More information

CDMA Example with MATLAB

CDMA Example with MATLAB CDMA Example with MATLAB Firstly we generate a small random sequence of binary data, that we represent as a sampled waveform with 64 samples per bit. % CDMA example clear all data = randint(1,15,2); for

More information

Wireless Networks. Why Wireless Networks? Wireless Local Area Network. Wireless Personal Area Network (WPAN)

Wireless Networks. Why Wireless Networks? Wireless Local Area Network. Wireless Personal Area Network (WPAN) Wireless Networks Why Wireless Networks? rate MBit/s 100.0 10.0 1.0 0.1 0.01 wired terminals WMAN WLAN CORDLESS (CT, DECT) Office Building stationary walking drive Indoor HIPERLAN UMTS CELLULAR (GSM) Outdoor

More information

CH 5. Air Interface of the IS-95A CDMA System

CH 5. Air Interface of the IS-95A CDMA System CH 5. Air Interface of the IS-95A CDMA System 1 Contents Summary of IS-95A Physical Layer Parameters Forward Link Structure Pilot, Sync, Paging, and Traffic Channels Channel Coding, Interleaving, Data

More information

Multiple Access Techniques

Multiple Access Techniques Multiple Access Techniques EE 442 Spring Semester Lecture 13 Multiple Access is the use of multiplexing techniques to provide communication service to multiple users over a single channel. It allows for

More information

Mobile Radio Systems OPAM: Understanding OFDM and Spread Spectrum

Mobile Radio Systems OPAM: Understanding OFDM and Spread Spectrum Mobile Radio Systems OPAM: Understanding OFDM and Spread Spectrum Klaus Witrisal witrisal@tugraz.at Signal Processing and Speech Communication Laboratory www.spsc.tugraz.at Graz University of Technology

More information

MODULATION AND MULTIPLE ACCESS TECHNIQUES

MODULATION AND MULTIPLE ACCESS TECHNIQUES 1 MODULATION AND MULTIPLE ACCESS TECHNIQUES Networks and Communication Department Dr. Marwah Ahmed Outlines 2 Introduction Digital Transmission Digital Modulation Digital Transmission of Analog Signal

More information

Carrier Frequency Offset Estimation in WCDMA Systems Using a Modified FFT-Based Algorithm

Carrier Frequency Offset Estimation in WCDMA Systems Using a Modified FFT-Based Algorithm Carrier Frequency Offset Estimation in WCDMA Systems Using a Modified FFT-Based Algorithm Seare H. Rezenom and Anthony D. Broadhurst, Member, IEEE Abstract-- Wideband Code Division Multiple Access (WCDMA)

More information

Significant technological

Significant technological From September 2005 High Frequency Electronics Copyright 2005 Summit Technical Media High Capacity Optical Networks Using OCDMA and OTDM Techniques By Daniel Lopes, Humberto Abdalla, Jr., and Antonio J.M.

More information

CSCD 433/533 Wireless Networks

CSCD 433/533 Wireless Networks CSCD 433/533 Wireless Networks Lecture 8 Physical Layer, and 802.11 b,g,a,n Differences Winter 2017 1 Topics Spread Spectrum in General Differences between 802.11 b,g,a and n Frequency ranges Speed DSSS

More information

Module 3: Physical Layer

Module 3: Physical Layer Module 3: Physical Layer Dr. Associate Professor of Computer Science Jackson State University Jackson, MS 39217 Phone: 601-979-3661 E-mail: natarajan.meghanathan@jsums.edu 1 Topics 3.1 Signal Levels: Baud

More information

IEEE P Wireless Access Method and Physical Layer Specification

IEEE P Wireless Access Method and Physical Layer Specification doc: IEEE P802.11 93/5 IEEE P802.11 Wireless Access Method and Physical Layer Specification Comparison between 3-channel FDMA and CDMA Direct Sequence Spread Spectrum System. Jan Boer, Rajeev Krishnamoorthy

More information

Digi-Wave Technology Williams Sound Digi-Wave White Paper

Digi-Wave Technology Williams Sound Digi-Wave White Paper Digi-Wave Technology Williams Sound Digi-Wave White Paper TECHNICAL DESCRIPTION Operating Frequency: The Digi-Wave System operates on the 2.4 GHz Industrial, Scientific, and Medical (ISM) Band, which is

More information

Spread Spectrum Signal for Digital Communications

Spread Spectrum Signal for Digital Communications Wireless Information Transmission System Lab. Spread Spectrum Signal for Digital Communications Institute of Communications Engineering National Sun Yat-sen University Multiple Access Schemes Table of

More information

Access Methods and Spectral Efficiency

Access Methods and Spectral Efficiency Access Methods and Spectral Efficiency Yousef Dama An-Najah National University Mobile Communications Access methods SDMA/FDMA/TDMA SDMA (Space Division Multiple Access) segment space into sectors, use

More information

Lauri Pirttiaho, NMP/Oulu

Lauri Pirttiaho, NMP/Oulu Contents: General about radio communications systems 3GPP WCDMA L1, the physical layer structure Transmitting and receiving Channels Codings Procedures Not included: Lauri Pirttiaho, NMP/Oulu diversity

More information

CDMA Technology. Pr. S.Flament Pr. Dr. W.Skupin On line Course on CDMA Technology

CDMA Technology. Pr. S.Flament   Pr. Dr. W.Skupin   On line Course on CDMA Technology CDMA Technology Pr. Dr. W.Skupin www.htwg-konstanz.de Pr. S.Flament www.greyc.fr/user/99 On line Course on CDMA Technology CDMA Technology : Introduction to spread spectrum technology CDMA / DS : Principle

More information

By Ryan Winfield Woodings and Mark Gerrior, Cypress Semiconductor

By Ryan Winfield Woodings and Mark Gerrior, Cypress Semiconductor Avoiding Interference in the 2.4-GHz ISM Band Designers can create frequency-agile 2.4 GHz designs using procedures provided by standards bodies or by building their own protocol. By Ryan Winfield Woodings

More information

A LITERATURE REVIEW IN METHODS TO REDUCE MULTIPLE ACCESS INTERFERENCE, INTER-SYMBOL INTERFERENCE AND CO-CHANNEL INTERFERENCE

A LITERATURE REVIEW IN METHODS TO REDUCE MULTIPLE ACCESS INTERFERENCE, INTER-SYMBOL INTERFERENCE AND CO-CHANNEL INTERFERENCE Ninth LACCEI Latin American and Caribbean Conference (LACCEI 2011), Engineering for a Smart Planet, Innovation, Information Technology and Computational Tools for Sustainable Development, August 3-5, 2011,

More information

CH 4. Air Interface of the IS-95A CDMA System

CH 4. Air Interface of the IS-95A CDMA System CH 4. Air Interface of the IS-95A CDMA System 1 Contents Summary of IS-95A Physical Layer Parameters Forward Link Structure Pilot, Sync, Paging, and Traffic Channels Channel Coding, Interleaving, Data

More information

2 INTRODUCTION TO GNSS REFLECTOMERY

2 INTRODUCTION TO GNSS REFLECTOMERY 2 INTRODUCTION TO GNSS REFLECTOMERY 2.1 Introduction The use of Global Navigation Satellite Systems (GNSS) signals reflected by the sea surface for altimetry applications was first suggested by Martín-Neira

More information

WIRELESS COMMUNICATIONS

WIRELESS COMMUNICATIONS WIRELESS COMMUNICATIONS P. Muthu Chidambara Nathan Associate Professor Department of Electronics and Communication Engineering National Institute of Technology Tiruchirappalli, Tamil Nadu New Delhi-110001

More information

Performance of a Flexible Form of MC-CDMA in a Cellular System

Performance of a Flexible Form of MC-CDMA in a Cellular System Performance of a Flexible Form of MC-CDMA in a Cellular System Heidi Steendam and Marc Moeneclaey Department of Telecommunications and Information Processing, University of Ghent, B-9000 GENT, BELGIUM

More information

MULTIPLE ACCESS SCHEMES OVERVIEW AND MULTI - USER DETECTOR

MULTIPLE ACCESS SCHEMES OVERVIEW AND MULTI - USER DETECTOR 2 MULTIPLE ACCESS SCHEMES OVERVIEW AND MULTI - USER DETECTOR 2.1 INTRODUCTION In the mobile environment, multiple access schemes are used to allow many mobile users to share simultaneously a finite amount

More information

BER Calculation of DS-CDMA over Communication Channels

BER Calculation of DS-CDMA over Communication Channels BER Calculation of DS-CDMA over Communication Channels Dr. Saroj Choudhary A, Purneshwari Varshney B A Associate Professor, Department of Applied Science, Jodhpur National University, Jodhpur, Rajasthan,

More information

A MODIFIED DIRECT-SEQUENCE SPREAD SPECTRUM MODULATION SCHEME FOR BURST TRANSMISSIONS. Bart Scheers and Vincent Le Nir

A MODIFIED DIRECT-SEQUENCE SPREAD SPECTRUM MODULATION SCHEME FOR BURST TRANSMISSIONS. Bart Scheers and Vincent Le Nir A MODIFIED DIRECT-SEQUENCE SPREAD SPECTRUM MODULATION SCHEME FOR BURST TRANSMISSIONS Bart Scheers and Vincent Le Nir CISS Department Royal Military Academy RMA) Brussels, Belgium {bart.scheers, vincent.lenir}@rma.ac.be

More information

Multistage Symbol-by-Symbol Bayesian Interference Cancellation for UMTS-CDMA Links Affected by Severe Multipath

Multistage Symbol-by-Symbol Bayesian Interference Cancellation for UMTS-CDMA Links Affected by Severe Multipath 1 Multistage Symbol-by-Symbol Bayesian Interference Cancellation for UMTS-CDMA Links Affected by Severe Multipath Roberto Cusani 1, Jari Mattila, Marco Di Felice 1 1 INFO-COM Dpt., University of Rome La

More information

Unit 1 Introduction to Spread- Spectrum Systems. Department of Communication Engineering, NCTU 1

Unit 1 Introduction to Spread- Spectrum Systems. Department of Communication Engineering, NCTU 1 Unit 1 Introduction to Spread- Spectrum Systems Department of Communication Engineering, NCTU 1 What does it mean by spread spectrum communications Spread the energy of an information bit over a bandwidth

More information

CONSTRUCTION AND PERFORMANCE STUDIES OF A PSEUDO-ORTHOGONAL CODE FOR FIBER OPTIC CDMA LAN

CONSTRUCTION AND PERFORMANCE STUDIES OF A PSEUDO-ORTHOGONAL CODE FOR FIBER OPTIC CDMA LAN International Journal of Soft Computing and Engineering (IJSCE) ISSN: 31-307, Volume-1, Issue-6, January 01 CONSTRUCTION AND PERFORMANCE STUDIES OF A PSEUDO-ORTHOGONAL CODE FOR FIBER OPTIC CDMA LAN Raj

More information

DESIGN AND IMPLEMENTATION OF WCDMA RAKE RECEIVER USED IN 3G WIRELESS COMMUNICATION

DESIGN AND IMPLEMENTATION OF WCDMA RAKE RECEIVER USED IN 3G WIRELESS COMMUNICATION http:// DESIGN AND IMPLEMENTATION OF WCDMA RAKE RECEIVER USED IN 3G WIRELESS COMMUNICATION Kapil Sahu 1, Sarita Boolchandani 2, Brijesh Kumar 3 1,2,3 E & C Dept., Vivekananda Institute of Technology-East,

More information

UNIT 4 Spread Spectrum and Multiple. Access Technique

UNIT 4 Spread Spectrum and Multiple. Access Technique UNIT 4 Spread Spectrum and Multiple Access Technique Spread Spectrum lspread spectrumis a communication technique that spreads a narrowband communication signal over a wide range of frequencies for transmission

More information

Design of Spread-Spectrum Communication System Based on FPGA

Design of Spread-Spectrum Communication System Based on FPGA Sensors & Transducers 203 by IFSA http://www.sensorsportal.com Design of Spread-Spectrum Communication System Based on FPGA Yixin Yan, Xiaolei Liu, 2* Xiaobing Zhang College Measurement Control Technology

More information

DESIGN AND ANALYSIS OF DS-CDMA DETECTED MULTIPATH SIGNALS USING THE RAKE RECEIVER SIMULATOR FOR WIRELESS COMMUNICATION.

DESIGN AND ANALYSIS OF DS-CDMA DETECTED MULTIPATH SIGNALS USING THE RAKE RECEIVER SIMULATOR FOR WIRELESS COMMUNICATION. International Journal of Computational Engineering Research Vol, 03 Issue, 7 DESIGN AND ANALYSIS OF DS-CDMA DETECTED MULTIPATH SIGNALS USING THE RAKE RECEIVER SIMULATOR FOR WIRELESS COMMUNICATION. 1, Parisae.Veera

More information

BER Analysis for Synchronous All-Optical CDMA LANs with Modified Prime Codes

BER Analysis for Synchronous All-Optical CDMA LANs with Modified Prime Codes BER Analysis for Synchronous All-Optical CDMA LANs with Modified Prime Codes Pham Manh Lam Faculty of Science and Technology, Assumption University Bangkok, Thailand Abstract The analysis of the BER performance

More information

CDMA Principle and Measurement

CDMA Principle and Measurement CDMA Principle and Measurement Concepts of CDMA CDMA Key Technologies CDMA Air Interface CDMA Measurement Basic Agilent Restricted Page 1 Cellular Access Methods Power Time Power Time FDMA Frequency Power

More information

Generation of Orthogonal Logistic Map Sequences for Application in Wireless Channel and Implementation using a Multiplierless Technique

Generation of Orthogonal Logistic Map Sequences for Application in Wireless Channel and Implementation using a Multiplierless Technique Generation of Orthogonal Logistic Map Sequences for Application in Wireless Channel and Implementation using a Multiplierless Technique KATYAYANI KASHYAP 1, MANASH PRATIM SARMA 1, KANDARPA KUMAR SARMA

More information

Correlation, Interference. Kalle Ruttik Department of Communications and Networking School of Electrical Engineering Aalto University

Correlation, Interference. Kalle Ruttik Department of Communications and Networking School of Electrical Engineering Aalto University Correlation, Interference Kalle Ruttik Department of Communications and Networking School of Electrical Engineering Aalto University Correlation Correlation Digital communication uses extensively signals

More information

Computational Complexity of Multiuser. Receivers in DS-CDMA Systems. Syed Rizvi. Department of Electrical & Computer Engineering

Computational Complexity of Multiuser. Receivers in DS-CDMA Systems. Syed Rizvi. Department of Electrical & Computer Engineering Computational Complexity of Multiuser Receivers in DS-CDMA Systems Digital Signal Processing (DSP)-I Fall 2004 By Syed Rizvi Department of Electrical & Computer Engineering Old Dominion University Outline

More information