<3rd generation CDMA wireless systems>

Size: px
Start display at page:

Download "<3rd generation CDMA wireless systems>"

Transcription

1 <3rd generation CDMA wireless systems> <Avneesh Agrawal, Qualcomm> Page 1

2 Overview What is 3G? A brief overview of IS95 Key design choices for CDMA 3G systems. Bandwidth Modulation Coding Power Control Transmit Diversity Base Station Synchronization. Acquisition Beam Forming Multi-user detection Peak To Average Power Objective is not to provide detailed justifications, but instead provide some insight into the level of optimization that went into designing the physical layer of the next generation wireless systems. Page 2

3 What is 3G? A loosely defined term referring to next generation wireless systems. Analog was 1G. GSM/IS95 were 2G. Next is 3G. Used interchangeably with IMT2000 although there are some specific IMT2000 guidelines defined by the ITU. Envisioned as a single Global standard allowing seamless roaming across the world. Market is expected to be fragmented amongst several competing standards. Mostly dominated by Direct Sequence CDMA. Marketed as Global 3G CDMA implying a single unified standard. In reality, Global 3G comprises of 3 modes :» Multi-carrier CDMA FDD» Direct Spread CDMA FDD» Direct Spread CDMA TDD There are others : IS95 HDR, EDGE, etc. Page 3

4 The Big Picture IS-41 AMPS CDMA-95 CDMA-95B CDMA-MC1x CDMA-MC3x IP IS95 HDR Indicative timeline of commercial launch GSM-MAP GSM HCSD Page 4 GPRS CDMA-DS FDD EDGE CDMA-TDD EDGE II

5 IS95 Forward Link (BS to mobile) Walsh 0 Pilot Channel (all 0's) A 800 bps Walsh m User m Forward Traffic Channel Rate Set kbps 4.0 kbps 2.0 kbps 0.8 kbps Add CRC Add 8 tail bits 9.6 kbps 4.8 kbps 2.4 kbps 1.2 kbps Conv Code Rate 1/2 K = ksps 9.6 ksps 4.8 ksps 2.4 ksps Symbol Repetition 19.2 ksps Mcps Power Control Bits Block Interleaver Mux 19.2 ksps 800 Hz A Long Code Generator Decimator Decimator 42 bit Long Code 800 bps Walsh j User j Forward Traffic Channel Rate Set 2 Add CRC Add 8 tail bits Conv Code Rate 1/2 K = 9 Symbol Repetition and Puncture Power Control Bits Block Interleaver Mux A kbps 6.25 kbps 2.75 kbps 1.05 kbps 14.4 kbps 7.2 kbps 3.6 kbps 1.8 kbps 28.8 ksps 14.4 ksps 7.2 ksps 3.6 ksps 19.2 ksps Mcps 19.2 ksps 800 Hz Long Code Generator Decimator Decimator 42 bit Long Code Sync Channel Paging Channel (x n) Other users traffic channel A Page 5

6 IS95 Forward Link (contd.) I-channel PN sequence Mcps cos (2π f t) Baseband Filter X A Σ s(t) Baseband Filter X Q-channel PN sequence Mcps sin (2π f t) Page 6

7 IS95 Reverse Link (Mobile to Base Station) 8.6 kbps 4.0 kbps 2.0 kbps 0.8 kbps Add CRC Add 8 tail bits 9.6 kbps 4.8 kbps 2.4 kbps 1.2 kbps Conv Code Rate 1/3 K = 9 OR Rate 1/2 K= ksps 14.4 ksps 7.2 ksps 3.6 ksps Symbol Repetition 28.8 ksps Block Interleaver 64-ary Orthogonal Modulator Data Burst Randomizer Mcps Mcps B kbps 6.25 kbps 2.75 kbps 1.05 kbps 14.4 kbps 7.2 kbps 3.6 kbps 1.8 kbps Long Code Generator Page 7

8 IS95 Reverse Link (contd.) I-channel PN sequence Mcps cos (2π f t) Baseband Filter X B 1/2 PN Chip Delay = ns Σ s(t) D Baseband Filter X Q-channel PN sequence Mcps sin (2π f t) Page 8

9 3G CDMA Page 9

10 3G Standards Focus on 2 systems WCDMA FDD and CDMA2000 Expected to be the dominant 3G standards, although IS95 HDR is gaining popularity. HDR is a data only system. WCDMA (CDMA-Direct Sequence) Strongly pushed by ETSI (Europe) and ARIB (Japan) CDMA Air interface (3.84 Mcps), GSM protocol stack. NTT DoCoMo (under pressure from IS95 deployment by DDI/IDO in Japan) is targeting initial deployment in Fall, CDMA2000 (CDMA - Multicarrier) An evolution over IS95 Two versions : 1x ( MHz) and 3x ( 3 carriers at MHz each) There seems to be little debate on which system has higher capacity (as technically, the two systems are very similar) Success depends largely on cost, time to market and political factors. Focus of this talk is on Physical Layer Page 10

11 WCDMA Forward Link OVSF Codes = BitReverse(Walsh Codes) DPDCH 1 /DPCCH S/P C ch,1... Σ I C scramb DPDCH DPDCH N S/P C ch,2 S/P C ch,n... Σ Q *j I+jQ Root Raised Cosine Filter (roll-off =.22) I Gold Code PN sequence Q Page 11

12 WCDMA Forward Link Channelization code and long scrambling code C, spreading length = M Tx. Antenna 1 Pilot Ant1 TPC Diversity Pilot Ant2 Ant1 M U X Tx. Antenna 2 Data Channel Encoder TFI Rate Matching Interleaver M U X STTD Encoder Ant2 QPSK symbols DPDCH DPCCH DPCCH Data1 N data1 bits TPC N TPC bits TFCI N TFCI bits T slot = 2560 chips, 10*2 k bits (k=0..7) DPDCH Data2 N data2 bits Pilot N pilot bits Slot #0 Slot #1 Slot #i Slot #14 One radio frame, T f = 10 ms Page 12

13 WCDMA Reverse Link DPDCH Data N data bits DPCCH Pilot N pilot bits TFCI N TFCI bits FBI N FBI bits TPC N TPC bits T slot = 2560 chips, 10*2 k bits (k=0..6) Channelization codes gain factors C ch,1 β d Slot #0 Slot #1 Slot #i Slot #14 DPDCH 1 C ch,3 β d 1 radio frame: T f = 10 ms DPDCH 3 Σ I C ch,d5 β d DPDCH 5 C scramb I+jQ C ch,2 β d DPDCH 2 C ch,4 β d DPDCH 4 Σ Q *j C ch,6 β d DPDCH 6 C ch,0 β c DPCCH Page 13

14 Bandwidth Both systems support wider bandwidth. Biggest advantage is ability to support higher peak rates. Although HDR supports the same peak rates in a 1.25 MHz channel. Other advantages (increased frequency diversity, better interference statistics, etc.) have not been properly quantified. The disadvantage is increased design complexity WCDMA has a bandwidth of 3.84 Mcps. Big PR effort against IS95 : Wideband vs Narrowband CDMA. CDMA2000 1x is the same as IS95. 3x MultiCarrier is Mcps. Both WCDMA and CDMA2000 3x MC support data rates around 2 Mbps. Only a single user (in good channel conditions) / sector can be supported at these rates, i.e. high rate service is not going to be cheap! Page 14

15 Reverse Link Modulation IS95 used 64-ary orthogonal modulation» This allowed non-coherent demod at the receiver. Coherent demodulation at receiver was considered risky.» Peak data rate (I.e kbps) was much lower than the signal bandwidth ( Mcps).» Assumed a conventional receiver (I.e single user CDMA receiver) at the base station. This implies that primary objective is to reduce transmit power at the mobile.» So, with this system, objective is to use the best (given the constraints of implementation complexity) rate 1/p code, where p = processing gain.» IS95 used a convolutional code (rate 1/2 or 1/3) followed by a (6,64) orthogonal block code, followed by a repetition code. Page 15

16 Forward Link Modulation IS95 used BPSK because» More tolerant to phase errors. Performance in fast fading channels was a concern.» General view was that IS95 was interference limited and hence more efficient modulation was not necessary. Clearly, increased bandwidth would have allowed more powerful lower rate codes, and hence could have increased capacity. In benign channel conditions (e.g. wireless local loop), the number of available walsh channels was limiting forward link capacity. Page 16

17 3G Modulation WCDMA, CDMA2000 : both are going for QPSK modulation (on both links) with pilot for phase reference.» Increased capacity, lower rate codes.» Coherent demodulation not perceived as a problem. In fact, the overhead of pilot on the up link more than compensated by improvements in synchronization and power control.» Supporting higher data rates. Hence, there is insufficient processing gain for 64- ary orthogonal modulation. HDR is using adaptive modulation (upto 16 QAM) and adaptive processing gain to improve capacity. Page 17

18 IS95 3G Coding Convolutional codes only. Rate 1/2 or 1/3 on uplink, K = 9. Rate 1/2 or 3/4 on downlink. The rate 3/4 code is used for the highest data rate (14.4 kbps), and is not a good code Same conv codes for CDMA2000, WCDMA and HDR, except that the rate 3/4 code has been removed and a rate 1/3 code on the downlink has been introduced. Turbo Codes for data.» CDMA2000 and WCDMA use the same parallel Concatenated Codes. K = 4, rate 1/3. The turbo interleavers are different» HDR : Serial Concatenated codes. K = 5, rate 1/2 outer code followed by K = 3, rate 1/2 inner code Page 18

19 IS95 3G Power Control Fast Reverse Link Power Control at 800 Hz Very slow Forward Power Control» IS95 A forward power control was a few Hz.» IS95 B increased it to 50 Hz Slow Forward Power Control big limitation. In order to guarantee voice quality, base station has to put a floor on minimum transmit power. Generally, the forward link is the capacity limiting link. CDMA2000 uses 800 Hz for both uplink and downlink. WCDMA uses 1500 Hz for both links. Improved forward power control has a significant improvement on system capacity. HDR uses rate control instead of power control. Page 19

20 No transmit diversity for IS95 CDMA2000 uses 2 forms: Transmit Diversity OTD : Orthogonal Transmit Diversity.» Transmit consecutive symbols on adjacent antennas using orthogonal codes. STS : Space Time Spreading» Ant 1 : S1 x W1(t) - S2* x W2(t)» Ant 2 : S1* x W2(t) + S2 x W1(t)» W1(t), W2(t) are orthogonal sequences. WCDMA supports several forms of Transmit Diversity STTD : Space Time Transmit Diversity» Ant 1 : transmit S1 S2, S1 & S2 are complex symbols» Ant 2 : transmit -S2* S1*» For STS & STTD, performance equivalent to two antenna receive diversity in flat fading environment. Page 20

21 Transmit Diversity Feedback Mode Transmit Diversity» WCDMA provides fast feedback (upto 1500 Hz) mode transmit diversity.» Allows receiver to control the amplitude and phase of the two antennas. Time Switched Transmit Diversity» Signal is transmitted alternately from two antennas using predetermined pattern. STTD S 1 S 2 Ant 1 Path 1 Mobile Antenna S 1 S 2 STTD encoder T 2T -S 2 * S 1 * 0 T 2T Ant 2 Path j N data Page 21

22 Base Station Synchronization CDMA systems generally have a frequency reuse factor of 1, and hence do not require any frequency planning. However, they do need to do code planning in order to ensure that they do not allocate the same PN codes to adjacent base stations. In IS95 and CDMA2000, different base stations use a different offset of the same PN sequence. Base stations are synchronized using GPS. Hence, having different offsets ensures that the PN sequences from different base stations will not coincide with one another. The offsets are at a minimum of 256 chips apart. WCDMA does not require synchronization. Mostly a political issue as some governments do not want to have their communications infrastructure rely on a US defense program. Once again, this was a big PR effort against IS95 & CDMA2000. Most of the initial deployments are expected to be in synchronous mode. Page 22

23 Base Station Synchronization Async. Systems cannot use offsets of the same PN sequence for different base stations and hence we need an efficient way to generate multiple PN sequences. WCDMA uses Gold codes for PN sequences. Gold codes are constructed as linear combinations (in GF(2) ) of two m-sequences. Cyclic shifts of one sequence with respect to another create different codes. IS95 & CDMA2000 use an m-sequence (I.e. maximal length LFSR) for generating the PN sequence. Asynchronous base stations have some problems : Initial Acquisition» Instead of searching for a single PN sequence, with async. Systems, the mobile has to search for multiple PN sequences. Handoff searching.» Every handoff search is like initial acquisition.» In contrast, for sync. Systems, handoff searching is simpler. E.g. for IS95, the initial acquisition window size is 2 15 chips. For handoff searching, the uncertainty is much less (= max delay spread) Page 23

24 Acquisition Fast acquisition is very important for a mobile user in a multi-cellular environment. Even more important for CDMA systems where minimizing transmit power to close the link is a key determinant of system capacity. So, phone should always try to lock onto the strongest pilot. CDMA2000 uses a continuous pilot like IS95. WCDMA uses a 3 step hierarchical search process to reduce acquisition time. Page 24

25 WCDMA Searching Total of 512 Gold Codes divided into 64 groups of 8 codes each. In addition, there are 2 Synchronization sequences, SCH1 and SCH2. SCH1 is a 256 chip PN code common to all base stations. Repeats every slot (1 slot = 2560 chips) SCH2 can be one 16 different sequences. Code length is 256 chips and it is time aligned with SCH1. Sequence length is 15 slots (10 ms). Sequence is sub-set of a Reed Solomon Code. Comma Free Property. That means, no cyclic shift of a code is a valid code. So, receiver can unambiguously determine start of 15 slot sequence. 64 different sequences, each representing one code group Step 1 : Use 256 chip match filter to determine modulo slot (I.e chips) timing. Step 2 : Identify code group and derive frame timing (10 ms timing) Step 3 : Exhaustive search against 8 possible codes in a code group. Page 25

26 WCDMA Synchronization Channel Slot #0 Slot #1 Slot #14 Primary SCH ac p ac p ac p Secondary SCH ac s i,0 ac s i,1 ac s i, chips 2560 chips One 10 ms SCH radio frame Page 26

27 Beam Forming IS95 only supports fixed sectorization. Beam Forming is considered important for 3G systems. All 3G systems (that I am aware of) support beam forming. Requirement is simple : Each channel with beam forming should have a dedicated pilot for phase reference. None of the systems provide a mechanism for the phone to provide the CSI (Channel State Information) to the transmitter (with the exception of Feedback Mode Transmit Diversity in WCDMA). Beam form on remote scatterers Have fixed spot beams for high capacity areas. Page 27

28 Multi-User Detection Does not seem to be much interest in multi-user detectors. A year ago, NTT was a big proponent of multi-user receivers, but lately there has been little development on that front. Biggest problem is designing multi-user receivers with reasonable complexity for a multi-cellular environment. WCDMA standard supports short spreading codes (256 chips as opposed to the regular chips) to aid in multi-user detection. With long codes, the correlation matrix of the codes changes every symbol. Schemes such as interference cancellation do not require standards support. In IS95 the downlink was the capacity limiting link. With WCDMA & CDMA2000, the downlink capacity has been improved, but with asymmetric data rates, downlink may still be the capacity limiting link. Having multi-user receivers on the base station would have little impact on capacity. Page 28

29 Peak To Average Power IS95 uses 2 schemes to reduce Peak To Average Power 3G Offset QPSK modulation to reduce Peak to Average. Constant power transmission. For lower data rates, transmission is discontinued for some duration. The Peak to average remains the same; however, peak to average when the Power Amplifier is on is reduced. HPSK (Hybrid Phase Shift Keying)» c = c1 (w0 + j c2*w1)» c1 = PN sequence changing at chip rate.» c2 = PN sequence changing at half the chip rate.» W0 = { 1 1}; W1 = {1-1}» phase transitions less than 90 degrees half the time. Continuous transmission => worse peak to average» Compensated by improved power control, time diversity and receiver synchronization. Page 29

30 Summary Forward Link Capacity Improvements Fast Forward Power Control More spectrally efficient modulation Turbo codes and lower rate convolutional codes. Transmit diversity Dedicated pilots for support of beam forming. Support higher peak data rates. Protocol improvements to improve packet data transmission. Page 30

31 Summary Reverse Link Capacity Improvements Coherent Reverse Link Improved synchronization and power control because of Reverse Link Pilot. Improved time diversity and power control because of continuous transmission. QPSK modulation Turbo codes Multi-user detection Faster Power Control (for WCDMA) Improved Access Channel Reservation based schemes as opposed to slotted Aloha in IS95 Page 31

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

A Simulation Tool for Third Generation CDMA Systems Presentation to IEEE Sarnoff Symposium

A Simulation Tool for Third Generation CDMA Systems Presentation to IEEE Sarnoff Symposium A Simulation Tool for Third Generation CDMA Systems Presentation to IEEE Sarnoff Symposium March 22, 2000 Fakhrul Alam, William Tranter, Brian Woerner Mobile and Portable Radio Research Group () e-mail:

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

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

ETSI SMG#24 TDoc SMG 903 / 97. December 15-19, 1997 Source: SMG2. Concept Group Alpha - Wideband Direct-Sequence CDMA: System Description Summary

ETSI SMG#24 TDoc SMG 903 / 97. December 15-19, 1997 Source: SMG2. Concept Group Alpha - Wideband Direct-Sequence CDMA: System Description Summary ETSI SMG#24 TDoc SMG 903 / 97 Madrid, Spain Agenda item 4.1: UTRA December 15-19, 1997 Source: SMG2 Concept Group Alpha - Wideband Direct-Sequence CDMA: System Description Summary Concept Group Alpha -

More information

CDMA Tutorial April 29, Michael Souryal April 29, 2006

CDMA Tutorial April 29, Michael Souryal April 29, 2006 Michael Souryal April 29, 2006 Common Components Encoding, modulation, spreading Common Features/Functionality Power control, diversity, soft handoff System Particulars cdmaone (IS-95) cdma2000 Sources:

More information

CDMA & WCDMA (UMTS) AIR INTERFACE. ECE 2526-WIRELESS & CELLULAR COMMUNICATION SYSTEMS Monday, June 25, 2018

CDMA & WCDMA (UMTS) AIR INTERFACE. ECE 2526-WIRELESS & CELLULAR COMMUNICATION SYSTEMS Monday, June 25, 2018 CDMA & WCDMA (UMTS) AIR INTERFACE ECE 2526-WIRELESS & CELLULAR COMMUNICATION SYSTEMS Monday, June 25, 2018 SPREAD SPECTRUM OPTIONS (1) Fast Frequency Hopping (FFSH) Advantages: Has higher anti-jamming

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

RF Lecture Series Modulation Fundamentals Introduction to WCDMA

RF Lecture Series Modulation Fundamentals Introduction to WCDMA RF Lecture Series Modulation Fundamentals Introduction to WCDMA Jeff Brenner Verigy Austin, TX 1. Introduction Second generation (2G) mobile communication standards were developed to provide higher bandwidth

More information

TELE4652 Mobile and Satellite Communications

TELE4652 Mobile and Satellite Communications Mobile and Satellite Communications Lecture 12 UMTS W-CDMA UMTS W-CDMA The 3G global cellular standard set to supersede GSM Universal Mobile Telecommunication System (UMTS) Slow on the uptake by mid-2008

More information

RFCD 202: Introduction to W-CDMA

RFCD 202: Introduction to W-CDMA RFCD 202: Introduction to W-CDMA Technical data is subject to change Copyright@2003 Agilent Technologies Printed on Dec. 4, 2002 5988-8504ENA This paper examines the core concepts of one operating mode

More information

Concept Group Alpha - Wideband Direct-Sequence CDMA (WCDMA) EVALUATION DOCUMENT (3.0) Part 1: System Description Performance Evaluation

Concept Group Alpha - Wideband Direct-Sequence CDMA (WCDMA) EVALUATION DOCUMENT (3.0) Part 1: System Description Performance Evaluation ETSI SMG Tdoc SMG 905/97 Meeting no 24 Madrid, Spain 15-19 December 1997 Source: SMG2 Concept Group Alpha - Wideband Direct-Sequence CDMA (WCDMA) EVALUATION DOCUMENT (3.0) Part 1: System Description Performance

More information

Cellular Network Planning and Optimization Part VI: WCDMA Basics. Jyri Hämäläinen, Communications and Networking Department, TKK, 24.1.

Cellular Network Planning and Optimization Part VI: WCDMA Basics. Jyri Hämäläinen, Communications and Networking Department, TKK, 24.1. Cellular Network Planning and Optimization Part VI: WCDMA Basics Jyri Hämäläinen, Communications and Networking Department, TKK, 24.1.2008 Outline Network elements Physical layer Radio resource management

More information

Lecture 3 Cellular Systems

Lecture 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 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

Channelisation Codes (2)

Channelisation Codes (2) Channelisation Codes (2) Scram. #0 +Chan. #1 Scram. #0 +Chan. #0 Scram. #1 +Chan. #0 R.Scram. #1 +Chan. #0 R.Scram. #1 +Chan. #1 R.Scram. #0 +Chan. #0 R.Scram. #0 +Chan. #1 p. 51 Channelisation Codes (3)

More information

TELE4652 Mobile and Satellite Communication Systems

TELE4652 Mobile and Satellite Communication Systems TELE4652 Mobile and Satellite Communication Systems Lecture 10 IS-95 CDMA A second generation cellular standard, based on CDMA technology, was proposed by Qualcomm in the early 1990s. It was standardised

More information

ECE 476/ECE 501C/CS Wireless Communication Systems Winter Lecture 9: Multiple Access, GSM, and IS-95

ECE 476/ECE 501C/CS Wireless Communication Systems Winter Lecture 9: Multiple Access, GSM, and IS-95 ECE 476/ECE 501C/CS 513 - Wireless Communication Systems Winter 2003 Lecture 9: Multiple Access, GSM, and IS-95 Outline: Two other important issues related to multiple access space division with smart

More information

An Overview of the QUALCOMM CDMA Digital Cellular Proposal

An Overview of the QUALCOMM CDMA Digital Cellular Proposal An Overview of the QUALCOMM CDMA Digital Cellular Proposal Zeljko Zilic ELE 543S- Course Project Abstract.0 Introduction This paper describes a proposed Code Division Multiple Access (CDMA) digital cellular

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

Designing and Testing 3GPP W-CDMA Base Stations

Designing and Testing 3GPP W-CDMA Base Stations Agilent Designing and Testing 3GPP W-CDMA Base Stations Application Note 1355 DTCH data bits DCCH data bits Add CRC & tail bits Add CRC & tail bits Conv. coder Conv. coder Rate matching Rate matching Interleaver

More information

RADIO LINK ASPECT OF GSM

RADIO LINK ASPECT OF GSM RADIO LINK ASPECT OF GSM The GSM spectral allocation is 25 MHz for base transmission (935 960 MHz) and 25 MHz for mobile transmission With each 200 KHz bandwidth, total number of channel provided is 125

More information

3G TECHNOLOGY WHICH CAN PROVIDE AUGMENTED DATA TRANSFER RATES FOR GSM STANDARTS AND THE MODULATION TECHNIQUES

3G TECHNOLOGY WHICH CAN PROVIDE AUGMENTED DATA TRANSFER RATES FOR GSM STANDARTS AND THE MODULATION TECHNIQUES 3G TECHNOLOGY WHICH CAN PROVIDE AUGMENTED DATA TRANSFER RATES FOR GSM STANDARTS AND THE MODULATION TECHNIQUES Mustafa ALKAN Ejder ORUÇ Nur ERZEN Özgür GENÇ malkan@tk.gov.tr eoruc@tk.gov.tr nerzen@tk.gov.tr

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

WCDMA / UMTS. Principle of Spectrum Spreading. Frequency used

WCDMA / UMTS. Principle of Spectrum Spreading. Frequency used WCDMA / UMTS UMTS (Universal Mobile Telecommunications System) is a new mobile standard. We talk about the third generation of telephony or 3G. Purists prefer the term W-CDMA (Wideband Code Division Multiple

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

Mobile Communication Systems. Part 7- Multiplexing

Mobile Communication Systems. Part 7- Multiplexing Mobile Communication Systems Part 7- Multiplexing Professor Z Ghassemlooy Faculty of Engineering and Environment University of Northumbria U.K. http://soe.ac.uk/ocr Contents Multiple Access Multiplexing

More information

Chapter 6 Applications. Office Hours: BKD Tuesday 14:00-16:00 Thursday 9:30-11:30

Chapter 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

Agilent Designing and Testing 3GPP W-CDMA Base Transceiver Stations

Agilent Designing and Testing 3GPP W-CDMA Base Transceiver Stations Agilent Designing and Testing 3GPP W-CDMA Base Transceiver Stations Application Note 1355 DTCH data bits DCCH data bits Add CRC & tail bits Add CRC & tail bits Conv. coder Conv. coder Rate matching Rate

More information

Mobile Radio Communications

Mobile Radio Communications Session 8: Mobile networks Session 8, page 1 Mobile (cellular) networks MSC PSTN PLMN BSC Session 8, page 2 Cellular systems around the world US systems (public cellular, cell phone systems) AMPS: Advance

More information

CSC344 Wireless and Mobile Computing. Department of Computer Science COMSATS Institute of Information Technology

CSC344 Wireless and Mobile Computing. Department of Computer Science COMSATS Institute of Information Technology CSC344 Wireless and Mobile Computing Department of Computer Science COMSATS Institute of Information Technology Wireless Cellular Networks: 2.5G and 3G 2.5G Data services over 2G networks GSM: High-speed

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

Chapter #4. An Overview of IS-95 and cdma INTRODUCTION

Chapter #4. An Overview of IS-95 and cdma INTRODUCTION Chapter #4 An Overview of IS-95 and cdma2000 Key words: Abstract: IS-95, cdma2000 The cdma2000 system is the third-generation extension of the existing IS-95 CDMA system currently deployed worldwide. This

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

Transmit Diversity Schemes for CDMA-2000

Transmit Diversity Schemes for CDMA-2000 1 of 5 Transmit Diversity Schemes for CDMA-2000 Dinesh Rajan Rice University 6100 Main St. Houston, TX 77005 dinesh@rice.edu Steven D. Gray Nokia Research Center 6000, Connection Dr. Irving, TX 75240 steven.gray@nokia.com

More information

Technical Aspects of LTE Part I: OFDM

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

More information

Chapter 5 3G Wireless Systems. Mrs.M.R.Kuveskar.

Chapter 5 3G Wireless Systems. Mrs.M.R.Kuveskar. Chapter 5 3G Wireless Systems Mrs.M.R.Kuveskar. Upgrade paths for 2G Technologies 2G IS-95 GSM- IS-136 & PDC 2.5G IS-95B HSCSD GPRS EDGE Cdma2000-1xRTT W-CDMA 3G Cdma2000-1xEV,DV,DO EDGE Cdma2000-3xRTT

More information

Chapter 8: GSM & CDAMA Systems

Chapter 8: GSM & CDAMA Systems Chapter 8: GSM & CDAMA Systems Global System for Mobile Communication (GSM) Second Generation (Digital) Cellular System Operated in 900 MHz band GSM is also operated in 1800 MHz band and this version of

More information

A COMPARISON STUDY OF 3G SYSTEM PROPOSALS: CDMA2000 VS. WCDMA

A COMPARISON STUDY OF 3G SYSTEM PROPOSALS: CDMA2000 VS. WCDMA A COMPARISON STUDY OF 3G SYSTEM PROPOSALS: CDMA2000 VS. WCDMA Emre A. Yavuz and Dr. Victor Leung University of British Colombia, 2356 Main Mall, Vancouver, BC, CANADA, V6T 1Z4 emrey@ece.ubc.ca ABSTRACT

More information

Designing and Testing cdma2000 Base Stations. Application Note 1357

Designing and Testing cdma2000 Base Stations. Application Note 1357 Designing and Testing cdma2000 Base Stations Application Note 1357 Table of Contents Introduction...........................................3 1 Basic Concepts of cdma2000..........................4 1.1

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

Wireless Networks (PHY): Design for Diversity

Wireless Networks (PHY): Design for Diversity Wireless Networks (PHY): Design for Diversity Y. Richard Yang 9/20/2012 Outline Admin and recap Design for diversity 2 Admin Assignment 1 questions Assignment 1 office hours Thursday 3-4 @ AKW 307A 3 Recap:

More information

GSM and WCDMA RADIO SYSTEMS ETIN15. Lecture no: Ove Edfors, Department of Electrical and Information Technology

GSM and WCDMA RADIO SYSTEMS ETIN15. Lecture no: Ove Edfors, Department of Electrical and Information Technology RADIO SYSTEMS ETIN15 Lecture no: 11 GSM and WCDMA Ove Edfors, Department of Electrical and Information Technology Ove.Edfors@eit.lth.se 2015-05-12 Ove Edfors - ETIN15 1 Contents (Brief) history of mobile

More information

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

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/

More information

Spread Spectrum Basics Spreading Codes IS-95 Features- Transmitter/Receiver Power Control Diversity Techniques RAKE Receiver Soft Handoff

Spread Spectrum Basics Spreading Codes IS-95 Features- Transmitter/Receiver Power Control Diversity Techniques RAKE Receiver Soft Handoff CDMA Mobile Communication & IS-95 1 Outline Spread Spectrum Basics Spreading Codes IS-95 Features- Transmitter/Receiver Power Control Diversity Techniques RAKE Receiver Soft Handoff 2 Spread Spectrum A

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

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

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

More information

Performance Evaluation of 3G CDMA Networks with Antenna Arrays

Performance Evaluation of 3G CDMA Networks with Antenna Arrays Jul. 2003 1 Performance Evaluation of 3G CDMA Networks with Antenna Arrays IEEE 4th Workshop on Applications and Services in Wireless Networks Dr. D. J. Shyy The Corporation Jin Yu and Dr. Yu-Dong Yao

More information

WCDMA and cdma The Radio Interfaces for Future Mobile Multimedia Communications - Part II

WCDMA and cdma The Radio Interfaces for Future Mobile Multimedia Communications - Part II WCDMA and cdma2000 - The Radio Interfaces for Future Mobile Multimedia Communications - Part II Emre A. Yavuz 6.0 WCDMA The WCDMA scheme has been developed as a joint effort between ETSI and ARIB during

More information

Level 6 Graduate Diploma in Engineering Wireless and mobile communications

Level 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 information

EC 551 Telecommunication System Engineering. Mohamed Khedr

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

More information

Adoption of this document as basis for broadband wireless access PHY

Adoption of this document as basis for broadband wireless access PHY Project Title Date Submitted IEEE 802.16 Broadband Wireless Access Working Group Proposal on modulation methods for PHY of FWA 1999-10-29 Source Jay Bao and Partha De Mitsubishi Electric ITA 571 Central

More information

Mobile Comms. Systems. Radio Interface

Mobile Comms. Systems. Radio Interface Radio Interface Multiple Access Techniques MuAT (1/23) The transmission of bidirectional information in duplex systems (uplink - UL - and downlink - DL - channels) can be done by dividing in: frequency:

More information

Chapter 7 Multiple Division Techniques for Traffic Channels

Chapter 7 Multiple Division Techniques for Traffic Channels Introduction to Wireless & Mobile Systems Chapter 7 Multiple Division Techniques for Traffic Channels Outline Introduction Concepts and Models for Multiple Divisions Frequency Division Multiple Access

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

Mobile Communications TCS 455

Mobile Communications TCS 455 Mobile Communications TCS 455 Dr. Prapun Suksompong prapun@siit.tu.ac.th Lecture 21 1 Office Hours: BKD 3601-7 Tuesday 14:00-16:00 Thursday 9:30-11:30 Announcements Read Chapter 9: 9.1 9.5 HW5 is posted.

More information

Keysight Technologies Designing and Testing 3GPP W-CDMA Base Transceiver Stations (Including Femtocells)

Keysight Technologies Designing and Testing 3GPP W-CDMA Base Transceiver Stations (Including Femtocells) Keysight Technologies Designing and Testing 3GPP W-CDMA Base Transceiver Stations (Including Femtocells) Application Note DTCH data bits DCCH data bits Add CRC & tail bits Add CRC & tail bits Conv. coder

More information

ALi Linear n-stage t ShiftRegister output tsequence

ALi Linear n-stage t ShiftRegister output tsequence PN CODE GENERATION (cont d) ALi Linear n-stage t ShiftRegister output tsequence Modulo-2 Adder h hn-1 h hn-2 h h2 h h1 X n-1 X n-2 X 1 X 0 Output Note: hi=1 represents a closed circuit; hi=0 represents

More information

SNS COLLEGE OF ENGINEERING COIMBATORE DEPARTMENT OF INFORMATION TECHNOLOGY QUESTION BANK

SNS 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 information

Page 1. What is a Survey? : Wireless Networks Lecture 8: Cellular Networks. Deliverables. Surveys. Cell splitting.

Page 1. What is a Survey? : Wireless Networks Lecture 8: Cellular Networks. Deliverables. Surveys. Cell splitting. What is a Survey? 18-759: Wireless Networks Lecture 8: Cellular Networks Dina Papagiannaki & Peter Steenkiste Departments of Computer Science and Electrical and Computer Engineering Spring Semester 2009

More information

WCDMA Basics Chapter 2 OBJECTIVES:

WCDMA Basics Chapter 2 OBJECTIVES: WCDMA Basics Chapter 2 This chapter is designed to give the students a brief review of the WCDMA basics of the WCDMA Experimental System. This is meant as a review only as the WCDMA basics have already

More information

The 5th Smart Antenna Workshop 21 April 2003, Hanyang University, Korea Broadband Mobile Technology Fumiyuki Adachi

The 5th Smart Antenna Workshop 21 April 2003, Hanyang University, Korea Broadband Mobile Technology Fumiyuki Adachi The 5th Smart Antenna Workshop 21 April 2003, Hanyang University, Korea Broadband Mobile Technology Fumiyuki Adachi Dept. of Electrical and Communications Engineering, Tohoku University, Japan adachi@ecei.tohoku.ac.jp

More information

Lecture overview. UMTS concept UTRA FDD TDD

Lecture overview. UMTS concept UTRA FDD TDD Lecture overview 3G UMTS concept UTRA FDD TDD 3 rd Generation of Mobile Systems Goal to create a global system enabling global roaming International Mobile Telecommunications (IMT-2000) requirements: Throughput

More information

ETSI SMG#24 TDoc SMG2 898 / 97 Madrid, Spain December 15-19, 1997 Source: SMG2. Concept Group Delta WB-TDMA/CDMA: Evaluation Summary

ETSI SMG#24 TDoc SMG2 898 / 97 Madrid, Spain December 15-19, 1997 Source: SMG2. Concept Group Delta WB-TDMA/CDMA: Evaluation Summary ETSI SMG#24 TDoc SMG2 898 / 97 Madrid, Spain December 15-19, 1997 Source: SMG2 Concept Group Delta WB-TDMA/CDMA: Evaluation Summary Introduction In the procedure to define the UMTS Terrestrial Radio Access

More information

Multiple Access Techniques

Multiple 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 information

Wireless Networks: An Introduction

Wireless 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 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

Wireless WANS and MANS. Chapter 3

Wireless WANS and MANS. Chapter 3 Wireless WANS and MANS Chapter 3 Cellular Network Concept Use multiple low-power transmitters (100 W or less) Areas divided into cells Each served by its own antenna Served by base station consisting of

More information

Evolution of Cellular Systems. Challenges for Broadband Wireless Systems. Convergence of Wireless, Computing and Internet is on the Way

Evolution of Cellular Systems. Challenges for Broadband Wireless Systems. Convergence of Wireless, Computing and Internet is on the Way International Technology Conference, 14~15 Jan. 2003, Hong Kong Technology Drivers for Tomorrow Challenges for Broadband Systems Fumiyuki Adachi Dept. of Electrical and Communications Engineering, Tohoku

More information

ISHIK UNIVERSITY Faculty of Science Department of Information Technology Fall Course Name: Wireless Networks

ISHIK UNIVERSITY Faculty of Science Department of Information Technology Fall Course Name: Wireless Networks ISHIK UNIVERSITY Faculty of Science Department of Information Technology 2017-2018 Fall Course Name: Wireless Networks Agenda Lecture 4 Multiple Access Techniques: FDMA, TDMA, SDMA and CDMA 1. Frequency

More information

10EC81-Wireless Communication UNIT-6

10EC81-Wireless Communication UNIT-6 UNIT-6 The first form of CDMA to be implemented is IS-95, specified a dual mode of operation in the 800Mhz cellular band for both AMPS and CDMA. IS-95 standard describes the structure of wideband 1.25Mhz

More information

Chapter 1 Acknowledgment:

Chapter 1 Acknowledgment: Chapter 1 Acknowledgment: This material is based on the slides formatted by Dr Sunilkumar S. Manvi and Dr Mahabaleshwar S. Kakkasageri, the authors of the textbook: Wireless and Mobile Networks, concepts

More information

IJPSS Volume 2, Issue 9 ISSN:

IJPSS Volume 2, Issue 9 ISSN: INVESTIGATION OF HANDOVER IN WCDMA Kuldeep Sharma* Gagandeep** Virender Mehla** _ ABSTRACT Third generation wireless system is based on the WCDMA access technique. In this technique, all users share the

More information

Smart Scheduling and Dumb Antennas

Smart Scheduling and Dumb Antennas Smart Scheduling and Dumb Antennas David Tse Department of EECS, U.C. Berkeley September 20, 2002 Berkeley Wireless Research Center Opportunistic Communication One line summary: Transmit when and where

More information

Performance Analysis of WiMAX Physical Layer Model using Various Techniques

Performance Analysis of WiMAX Physical Layer Model using Various Techniques Volume-4, Issue-4, August-2014, ISSN No.: 2250-0758 International Journal of Engineering and Management Research Available at: www.ijemr.net Page Number: 316-320 Performance Analysis of WiMAX Physical

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

RADIO SYSTEMS ETIN15. Lecture no: GSM and WCDMA. Ove Edfors, Department of Electrical and Information Technology

RADIO SYSTEMS ETIN15. Lecture no: GSM and WCDMA. Ove Edfors, Department of Electrical and Information Technology RADIO SYSTEMS ETIN15 Lecture no: 11 GSM and WCDMA Ove Edfors, Department of Electrical and Information Technology Ove.Edfors@eit.lth.se 1 Contents (Brief) history of mobile telephony Global System for

More information

Cellular Wireless Networks. Chapter 10

Cellular Wireless Networks. Chapter 10 Cellular Wireless Networks Chapter 10 Cellular Network Organization Use multiple low-power transmitters (100 W or less) Areas divided into cells Each cell is served by base station consisting of transmitter,

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

References. What is UMTS? UMTS Architecture

References. What is UMTS? UMTS Architecture 1 References 2 Material Related to LTE comes from 3GPP LTE: System Overview, Product Development and Test Challenges, Agilent Technologies Application Note, 2008. IEEE Communications Magazine, February

More information

Abstract. Marío A. Bedoya-Martinez. He joined Fujitsu Europe Telecom R&D Centre (UK), where he has been working on R&D of Second-and

Abstract. Marío A. Bedoya-Martinez. He joined Fujitsu Europe Telecom R&D Centre (UK), where he has been working on R&D of Second-and Abstract The adaptive antenna array is one of the advanced techniques which could be implemented in the IMT-2 mobile telecommunications systems to achieve high system capacity. In this paper, an integrated

More information

The BER Evaluation of UMTS under Static Propagation Conditions

The BER Evaluation of UMTS under Static Propagation Conditions Proceedings of the 5th WSEAS Int. Conf. on System Science and Simulation in Engineering, Tenerife, Canary Islands, Spain, December 16-18, 2006 310 The BER Evaluation of UMTS under Static Propagation Conditions

More information

PERFORMANCE ANALYSIS OF DOWNLINK POWER CONTROL IN WCDMA SYSTEM

PERFORMANCE ANALYSIS OF DOWNLINK POWER CONTROL IN WCDMA SYSTEM PERFORMANCE ANALYSIS OF DOWNLINK POWER CONTROL IN WCDMA SYSTEM Dr. M. Mahbubur Rahman, Md. Khairul Islam, Tarek Hassan-Al-Mahmud, A. R. Mahmud Abstract: WCDMA (Wideband Code Division Multiple Access) plays

More information

NAVAL POSTGRADUATE SCHOOL Monterey, California THESIS ANALYSIS OF LARGE AREA SYNCHRONOUS CODE- DIVISION MULTIPLE ACCESS (LAS-CDMA) Stephen A.

NAVAL POSTGRADUATE SCHOOL Monterey, California THESIS ANALYSIS OF LARGE AREA SYNCHRONOUS CODE- DIVISION MULTIPLE ACCESS (LAS-CDMA) Stephen A. NAVAL POSTGRADUATE SCHOOL Monterey, California THESIS ANALYSIS OF LARGE AREA SYNCHRONOUS CODE- DIVISION MULTIPLE ACCESS (LAS-CDMA) by Stephen A. Brooks June 2002 Thesis Advisor: Co-Advisor: R. Clark Robertson

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

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

Opportunistic Communication in Wireless Networks

Opportunistic Communication in Wireless Networks Opportunistic Communication in Wireless Networks David Tse Department of EECS, U.C. Berkeley October 10, 2001 Networking, Communications and DSP Seminar Communication over Wireless Channels Fundamental

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

Lecture 12: Summary Advanced Digital Communications (EQ2410) 1

Lecture 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 information

3. 3. Noncoherent Binary Modulation Techniques

3. 3. Noncoherent Binary Modulation Techniques 3. 3. Noncoherent Binary Modulation Techniques A digital communication receiver with no provision make for carrier phase recovery is said to be noncoherent. A. Noncoherent Orthogonal Modulation Scheme.

More information

Investigation on Multiple Antenna Transmission Techniques in Evolved UTRA. OFDM-Based Radio Access in Downlink. Features of Evolved UTRA and UTRAN

Investigation 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 information

DATA CHUNKING IN QUASI-SYNCHRONOUS DS-CDMA. A Thesis. presented to. the Faculty of California Polytechnic State University, San Luis Obispo

DATA CHUNKING IN QUASI-SYNCHRONOUS DS-CDMA. A Thesis. presented to. the Faculty of California Polytechnic State University, San Luis Obispo DATA CHUNKING IN QUASI-SYNCHRONOUS DS-CDMA A Thesis presented to the Faculty of California Polytechnic State University, San Luis Obispo In Partial Fulfillment of the Requirements for the Degree Master

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

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

CHAPTER 2 WCDMA NETWORK

CHAPTER 2 WCDMA NETWORK CHAPTER 2 WCDMA NETWORK 2.1 INTRODUCTION WCDMA is a third generation mobile communication system that uses CDMA technology over a wide frequency band to provide high-speed multimedia and efficient voice

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

Field Experiments of 2.5 Gbit/s High-Speed Packet Transmission Using MIMO OFDM Broadband Packet Radio Access

Field Experiments of 2.5 Gbit/s High-Speed Packet Transmission Using MIMO OFDM Broadband Packet Radio Access NTT DoCoMo Technical Journal Vol. 8 No.1 Field Experiments of 2.5 Gbit/s High-Speed Packet Transmission Using MIMO OFDM Broadband Packet Radio Access Kenichi Higuchi and Hidekazu Taoka A maximum throughput

More information

UNIT - 1 [INTRODUCTION TO WIRELESS COMMUNICATION SYSTEMS] OLUTION OF MOBILE RADIO COMMUNICATION

UNIT - 1 [INTRODUCTION TO WIRELESS COMMUNICATION SYSTEMS] OLUTION OF MOBILE RADIO COMMUNICATION i CONTENTS UNIT - 1 [INTRODUCTION TO WIRELESS COMMUNICATION SYSTEMS]... 1.1-1.26 1.1 INTRODUCTION... 1.2 1.2 EVOL OLUTION OF MOBILE RADIO COMMUNICATION... 1.2 1.3 EXAMPLES OF WIRELESS COMMUNICATION SYSTEMS...

More information

HSPA & HSPA+ Introduction

HSPA & HSPA+ Introduction HSPA & HSPA+ Introduction www.huawei.com Objectives Upon completion of this course, you will be able to: Understand the basic principle and features of HSPA and HSPA+ Page1 Contents 1. HSPA & HSPA+ Overview

More information

FPGA Simulation of WCDMA Baseband Receiver Carrier Synchronization Unit

FPGA Simulation of WCDMA Baseband Receiver Carrier Synchronization Unit FPGA Simulation of WCDMA Baseband Receiver Carrier Synchronization Unit Sujatha E 1, Dr. C Subhas 2 Assistant professor, Dept. of EConE, Sree Vidyanikethan Engineering College, Tirupati, A.P, India 1 Professor,

More information