CDMA Presentation
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This document summarizes key aspects of cellular telephony systems and the CDMA technique. It begins by outlining cellular telephony and multiple access techniques like TDMA, FDMA, and CDMA. It then focuses on CDMA, explaining that it uses spread spectrum techniques to allow multiple users to share frequencies simultaneously through encoding with pseudo-random digital sequences. The document outlines the spread spectrum technique used in CDMA and how it transmits and reconstructs data. It concludes by listing advantages of CDMA like high spectral capacity and call quality, and disadvantages such as limitations in international roaming and degradation of audio quality with large numbers of users.
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CDMA allows multiple users to access the same wireless channel using pseudo-random codes to distinguish users. It spreads signals across a wide bandwidth and uses coding to prevent interference between signals. CDMA provides advantages like higher capacity, better quality, and enhanced security compared to other multiple access techniques like FDMA and TDMA. However, limitations like imperfect synchronization and varying signal strengths reduce CDMA's capacity in practice compared to theoretical calculations. The main application of CDMA is in mobile phone networks due to its efficient use of bandwidth.Cdma
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you can be friend with me on orkut
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Code Division Multiple Access.
CDMA Overview
Spread Spectrum
CDMA Characteristics
Advantage/Disadvantage
Future Trend & Conclusion
Please like and Comments
Mr.Vishal Pawar
MITSOT
www.mitsot.com
www.kmallonline.com
http://telecommunicationsdemystified.blogspot.in/
http://marketingmythsdemystified.blogspot.in/CDMA Introducton
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損 Direct Spread CDMA TDD
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Global 3G comprises of 3 modes :
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CDMA stands for Code Division Multiple Access. It is a digital wireless communication technology that allows multiple users to access a single channel using unique code assignments. CDMA has evolved through standards like IS-95, CDMA2000, and WCDMA. It provides benefits like increased capacity, soft handoffs, and lower power consumption compared to other technologies. While CDMA has advantages, it also faces challenges like higher licensing costs and reduced coverage area with increasing subscriber loads. Overall, CDMA remains an effective multiple access technique for wireless communications.More Related Content
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The document discusses spread spectrum technology and CDMA. It describes three types of spread spectrum techniques: frequency hopping, time hopping, and direct sequence. It then discusses CDMA2000 and how the bandwidth required varies depending on the spreading factor and type. It provides details on the transmission characteristics of CDMA2000 such as modulation schemes and channel spacing.TDMA
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TDMA (Time Division Multiple Access) is a digital transmission technology that allows multiple users to share the same frequency channel by dividing the signal into different time slots. It allocates a single frequency channel for a short time and then switches to another channel, with the digital samples from a single transmitter occupying different time slots across several frequency bands simultaneously. The current TDMA standard for cellular divides each channel into six time slots, with each signal using two slots, providing three times the capacity of earlier analog cellular standards.3g cdma-qualcom
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There are others : IS95 HDR, EDGE, etc.
損 Direct Spread CDMA TDD
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Global 3G comprises of 3 modes :
Marketed as Global 3G CDMA implying a single unified standard. In reality,
Mostly dominated by Direct Sequence CDMA.
Market is expected to be fragmented amongst several competing
IMT2000 guidelines defined by the ITU.
Analog was 1G. GSM/IS95 were 2G. Next is 3G.
What is 3G ?
standards.
across the world.
Envisioned as a single Global standard allowing seamless roaming
Used interchangeably with IMT2000 although there are some specific
A loosely defined term referring to next generation wireless systems.
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This document compares and contrasts the GSM and CDMA mobile communication technologies. It outlines that GSM uses TDMA and FDMA to allow multiple users to access the frequency channel simultaneously through time and frequency division. CDMA allows multiple users by assigning each a unique code and spreading their information across the entire frequency band. The document discusses the features and techniques of both standards, and compares their advantages and disadvantages, such as GSM providing better building penetration versus CDMA's increased capacity. It notes that while CDMA was dominant in North America, GSM networks are expanding globally.GSM 
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1. 1G wireless networks used analog signals which could be intercepted, had low capacity, and unreliable voice quality. 2G introduced digital signals, SMS, and email but still had slow data speeds around 10kbps. 3G brought higher speeds up to 2Mbps, supported new services like video calls and streaming.
2. Common 2G standards included GSM, IS-136, and PDC. CDMA2000 and W-CDMA were major 3G standards using CDMA and W-CDMA technologies respectively. 2.5G technologies like GPRS provided some 3G capabilities on existing 2G networks.
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yahoo journals, bing journals, International Journal of Engineering Research and Development, google journals, hard copy of journalGSM & CDMA & OFDM
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Cellular networks have evolved over generations from 1G to 5G. 1G networks were analog and allowed only voice calls within a single country. 2G networks were digital and allowed texting and basic data services. Frequency reuse is a technique where frequencies are assigned to different cells to allow for increased capacity and coverage across a geographic area. Newer generations like 3G, 4G, and 5G have brought higher data speeds and more advanced services like video calling.W cdma
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W-CDMA is a 3G mobile technology that provides higher data speeds than previous technologies. It was developed by 3GPP and first launched commercially by NTT DoCoMo in Japan. W-CDMA uses CDMA to allow multiple signals over one channel, with each user assigned a unique code. It employs spread spectrum techniques like direct sequence SS and frequency hopping SS. The presentation provides information on W-CDMA history, duplexing, multiple access techniques, coding and decoding, applications, and concludes it is a growing mobile technology.3 g
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The document summarizes third generation (3G) mobile technology standards including GSM, EDGE, CDMA2000, UMTS, DECT, and WiMAX. 3G allows for simultaneous voice and data services, higher data rates up to 14 Mbps download and 5.8 Mbps upload, and enables more advanced services and greater network capacity. Key 3G standards include UMTS which uses W-CDMA, security, and roaming capabilities between operators.CMC notes Unit 5.pptx
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This document provides an overview of the evolution of modern wireless communication systems from 1G to 5G networks. It summarizes the key technologies and standards for each generation, including AMPS for 1G, GSM, IS-136 and PDC for 2G, UMTS/W-CDMA, CDMA2000, and TD-SCDMA for 3G. It also discusses 2.5G and 3G technologies like GPRS, EDGE, HSPA that enhanced earlier standards. The document details wireless transmission protocols like Bluetooth, WLAN, and technologies like wireless local loop and LMDS.Cellular network and frequency reusability.pptx
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This document discusses cellular network concepts and frequency reusability. It describes how cellular networks are divided into multiple cells served by base stations to allow for frequency reuse. It explains different multiple access techniques used in cellular networks like FDMA, TDMA, and CDMA. It also covers mobility management techniques like handoff management and location management. Finally, it provides an overview of the generations of cellular networks, from 1G to 5G, describing their key technologies and characteristics.Business prospect of launching blackberry with video calling in CDMA
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The document discusses the prospects of launching a Blackberry smartphone with video calling capabilities in the CDMA network. It provides details on the CDMA and GSM technologies, including their advantages and disadvantages. It then compares the two networks specifically in terms of video calling facilities. It determines that GSM networks have faster data speeds and stronger support for video calling compared to CDMA. Therefore, the document concludes that launching a Blackberry with video calling in CDMA networks would not be a successful business prospect due to CDMA's limitations for video capabilities compared to GSM.CDMA Presentation
- 1. Cellular Telephony (CDMA Technique + Data) Presented by Md. Mazed Rayhan Shuvo Roll: 1309023 & Ashikur Rahman Roll: 1309024
- 2. 2 Key Points Cellular Telephony Systems Cellular Telephony System Techniques Why CDMA technique? What is CDMA ? Spread Spectrum Technique in CDMA CDMA Data transmission and reconstruction Advantages of CDMA Disadvantages of CDMA
- 3. Cellular Telephony System3 Both wire and wireless telecommunication of voice, video, and data Based on large number of subscribers and MSC-CO Introduced by Bell Telephone Laboratories in 1971, as Advanced Mobile Phone System Usage of different multiple access technique like TDMA, FDMA , CDMA Evolution of 1G, 2G, 3G and 4G
- 4. 4
- 5. Cellular Telephony System Techniques5 Time Division Multiple Access (TDMA): Most 2G cellular systems are based on TDMA. TDMA technology was popular in Europe, Japan and Asian countries. Frequency Division Multiple Access (FDMA): FDMA is a channel access method used in multiple-access protocols as a channelization protocol. Code Division Multiple Access (CDMA): CDMA is an example of multiple access, where several subscribers can send information simultaneously over a single communication channel. This allows several users to share a band of frequencies.
- 6. Why CDMA technique?6 FDMA vs TDMA vs CDMA Techniques
- 7. What is CDMA ?7 A digital wireless technology that uses spread-spectrum techniques. CDMA does not assign a specific frequency to each user. Instead, every channel uses the full available spectrum. Individual conversations are encoded with a pseudo-random digital sequence. Provides better capacity for voice and data communications than other commercial mobile technologies, allowing more subscribers to connect at any given time. It is the common platform on which 3G technologies are built.
- 8. 8 Code Division Multiple Access Technique
- 9. Spread Spectrum Technique in CDMA9
- 10. CDMA Data transmission and reconstruction (using spread spectrum) 10
- 11. Advantages of CDMA11 High spectral capacity. Reusing the same frequency in every cell eliminates the need for frequency planning. Rejection of narrow band interference (i.e. in FDMA) Usage of the soft hand off, which is undetectable and provides a more reliable and higher quality signal. Call dropout occurrence is very rare. Covers more area than GSM.
- 12. Disadvantages of CDMA12 Lack of international roaming capabilities compared to GSM Limited variety of the handset e.g. Citycell in Bangladesh The ability to upgrade or change to another handset is not easy Near-far problem After a certain number of users, in the same area audio quality degrades.
- 13. 13 Thanks to all