Advantages Of CDMA

what is CDMA ? what is its advantages compared to other?

Replies

  • [Prototype]
    [Prototype]
    The most significant advantage is the security.
  • naveee
    naveee
    [Prototype]
    The most significant advantage is the security.
    code division multiple access....... is used in mobile fones ???
  • [Prototype]
    [Prototype]
    naveee
    code division multiple access....... is used in mobile fones ???
    You don't know? Reliance, Tata Indicom, Virgin, all had CDMA service. The Reliance basically started with the CDMA service only.

    Besides, the new dongles, which uses EVDO are also based on CDMA.
  • [Prototype]
    [Prototype]
    Steven Brooks
    Hello Community,

    CDMA is Code-Division Multiple Access abbreviation, full known as Code Division Multiple Access, is a more advanced digital interface technology, which is characterized by a high frequency of utilization, mobile low power consumption, good quality voice calls.
    Compared with GSM phones, CDMA mobile phone has the following advantages:

    1. Outstanding Voice and Call Quality
    2. Greatest Coverage for Lower Cost
    3. Packet Data
    4. Longer Talk Time, Longer Battery Life and Smaller Phones
    5. Rapid Deployment
    6. Continuing Technology Advances
    7. Wide Product Selection

    Thanks and Regards,
    Steven Brooks
    Please explain how it have high frequency utilization when pseudo random codes are added and considering it uses spread spectrum modulation?
  • naveee
    naveee
    [Prototype]
    Please explain how it have high frequency utilization when pseudo random codes are added and considering it uses spread spectrum modulation?
    we use dc (battery) supply for mobiles ...... will frequency comes in dc source?????
  • [Prototype]
    [Prototype]
    naveee
    we use dc (battery) supply for mobiles ...... will frequency comes in dc source?????
    You're mixing up the things. The supply doesn't play any role. GSM as well requires frequency. Its totally unrelated to modulation technique used. There's separate oscillator circuits for that work.
  • arunchary
    arunchary
    cdma draws more power compare to gsm mobile phones.because of property and accessing criteria of cdma.according to technology everyone is allocated with unique code access while in communicating,but in gsm it wont happen and more over cdma as more security compare to gsm phones.
    but only one disadvantage in cdma is more power is consumed by a phone for searching signal across areas,it wont applicable in gsm technology.
    you can also search this site for advance concepts in gsm and cdma

    #-Link-Snipped-#
  • naveee
    naveee
    [Prototype]
    You're mixing up the things. The supply doesn't play any role. GSM as well requires frequency. Its totally unrelated to modulation technique used. There's separate oscillator circuits for that work.
    do we need capacitor to operate the frequency ?????
  • Jeffrey Arulraj
    Jeffrey Arulraj
    well this is not simple circuitory you are taking about

    most cell phones have special tuners which use varactors instead of capacitors

    by the way what is your confusion why this post here in the heading CDMA
  • arunchary
    arunchary
    capacitor is used for block the frequency,in the sense reduce the frequency components not for operate....
  • naveee
    naveee
    arunchary
    capacitor is used for block the frequency,in the sense reduce the frequency components not for operate....
    then why variable capacitor is used in radio circuits (for tuning )
  • Jeffrey Arulraj
    Jeffrey Arulraj
    naveee
    then why variable capacitor is used in radio circuits (for tuning )
    variable frequencies are old fashioned they are out dated

    now voltage dependant caps are used

    variable caps are used for frequency selection purpose
  • Nishant Patel
    Nishant Patel
    do not concern about freq. generation in mobile. its done internally through crystal oscillator. we just apply d.c. supply(with battery).
    remember uController, supply is d.c. but freq. is generated by crystal.

    main diff. b/w cdma and gsm, cdma has only one freq. over diff. cells; while in gsm all cell areas are given diff. freq. allocation or commn.
  • arunchary
    arunchary
    for the purpose of resonance criteria we can observe the frequency tuning and selection,and also we can observe the voltage depending capacitor like 1uf of 100v .example FM radios where frequency tuning is happen with respect to desired frequency to match.that's why we can listen clealy across matched frequency and apart nothing.it can be applicable in all frequency selection modules.
  • Jeffrey Arulraj
    Jeffrey Arulraj
    why this discussion here in the title advantages of CDMA

    really confusing

    #-Link-Snipped-#

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