Code division multiple access

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  • Code Division Multiple Access

    540 Words  | 2 Pages

    INTRODUCTION: Code division multiple access (CDMA) is a technology which is used for radio communication purpose. Multiple access technique is a broad area for communication purpose , CDMA is an example of multiple access technology, through which several number of transmitter can send information in a single communication channel. In case of CDMA a particular bandwidth can shared between several number of users. To permit this technique to achieve without undue interference between users, spread

  • The Importance Of Multicarrier Techniques For A Single Carrier System

    1279 Words  | 6 Pages

    subcarriers [1, 2]. Thus the signal bandwidth becomes very less compared with coherence bandwidth ensuring no ISI in time domain and flat fading in frequency domain. Multicarrier systems such as Orthogonal Frequency Division Multiplexing (OFDM) and Multi Carrier Code Division Multiple Access (MC-CDMA) were considered to be the best technologies for 4G wireless communication [1, 2]. Fig. explains the spectrum of multicarrier and single carrier systems. In the single carrier system the information symbols

  • Advantages And Disadvantages Of Downlink Multiplexing

    834 Words  | 4 Pages

    mapped to more than one code additionally, which is essential when the single code capability in either the terminal or base station is surpassed. Downlink Shared Channel Transmitting data with elevated peak rate and small activity cycle in the downlink rapidly causes the channelisation codes under a solitary scrambling code to start to come to an end. In order to circumvent this complication, fundamentally two alternatives exist: exercise of either supplementary scrambling codes. The supplementary

  • Multiple Access Protocols Is A Type Channel Partitioning Protocol

    945 Words  | 4 Pages

    this, multiple access protocols coordinate the transmission. There are three classes of multiple access protocols, random access, taking-turns and channel partitioning. With random access protocol, each node tries to randomly to access the complete broadcast link, without any regard to the other nodes. Taking-turns protocol utilizes some type of turning mechanism, which designates which node is allowed to transmit. Channel partitioning protocol divides the channel (time slots, frequency, code) and

  • Advantages And Disadvantages Of FDMA (MAC)

    1443 Words  | 6 Pages

    medium access control(MAC). The problem presented to us is how to access a communication medium in such a way that transmissions from different users will not interfere with each other or at least keep the interference, if any, to a minimum degree so that users can reliably communicate with their intended destinations. The full name of the mentioned multiple scheme are as follows: FDMA – Frequency division multiple access WDMA – Wavelength division multiple access CDMA – Code division multiple access

  • Mobile Telephone Call : A Mobile Device Essay

    892 Words  | 4 Pages

    Mobile telephone call: A mobile device initiates a call by sending the number of the called device on the preselected setup channel. In this process, the the mobile device firstly checks whether the setup channel is idle by examining information that comes from the BS channel. If it finds that the setup channel is idle, the mobile device may transmit the information of number to the BS. The BS then sends the request to the MTSO. Mobile device paging: The MTSO then tries to complete the connection

  • Data Processing And Processing Of Data

    1010 Words  | 5 Pages

    example in detail later. MULTIPLE ACCESS TECHNIQUES These techniques allow a large number of users to access information through the same channel in wireless communication systems, also regarded as air-interface as mentioned previously. Thus, also making effective use of allocated bandwidth. The following three techniques come under this category: FDMA – Frequency División Multiple Access TDMA – Time Division Multiple Access CDMA – Coded Detection Multiple Access For, FDMA, an allocated bandwidth

  • Advantages And Disadvantages Of 5.1 Ofdm-IDMA Scheme

    1335 Words  | 6 Pages

    5.1 OFDM-IDMA Scheme Various multiple access technique like TDMA, CDMA, FDMA has been used in wireless network for communication. But OFDM i.e orthogonal frequency division multiple access offers number of advantages over these multiple access techniques, such as this scheme can provide simple treatment against ISI and also reduces cross cell interference. The IDMA in combination with OFDM allow effective and simple turbo type iterative MUD algorithm which can be easily implemented to large number

  • Cdma Based Bus Arbitration System

    1693 Words  | 7 Pages

    CDMA BASED BUS ARBITRATION IN SoC Mayank Chakraverty(1) , Ritaban Chakravarty(2) , Sandeep Mandava(3) M.Tech Nanotechnology, Nanotechnology Division, School of Electronics Engineering , VIT University, Vellore. , , 09962265270(1), 09566810791(2) , 09092517336(3) ABSTRACT Future SoC will be implemented with the latest arbitration scheme. CDMA is the latest

  • Nokia Forms 3G Joint Venture in China Essay

    7753 Words  | 32 Pages

    Nokia and China Puritan have committed to forming a joint venture in China focused on 3G, or more specifically, TD-SCDMA (time division-synchronous code division multiple access) and W-CDMA. The joint venture will focus on research and development, manufacturing and sales of 3G network systems. The JV will begin offering its first TD-SCDMA and W-CDMA systems next year under China Puritan's Potevio label. The TD-SCDMA standard is being billed as a Chinese alternative to 3G. In addition to