SSC General Science & Technology Sample Paper NCERT Sample Paper-4

  • question_answer
    Which one of the following is correct about the CDMA channel access standard in the radio- telecommunications?

    A)  Time division is mainly used in the channel access of CDMA

    B)  Frequency division standard is utilised in the CDMA channel access

    C)  Spread-spectrum technology with special codes is used in the CDMA channel access

    D)  None of the statements given in 'a', 'b' and 'c' is correct about the channel access of CDMA

    Correct Answer: C

    Solution :

    [c] Code division multiple access (CDMA) is a channel access method used by various radio communication technologies. CDMA is an example of multiple access, where several transmitters can send information simultaneously over a single communication channel. This allows several users to share a band of frequencies. To permit this without undue interference between the users, CDMA employs spread-spectrum technology and a special coding scheme (where each transmitter is assigned a code). CDMA is used as the access method in many mobile phone standards such as cdma One, CDMA2000 (the 3G evolution of cdma One), and WCDMA (the 3G standard used by GSM carriers), which are often referred to as simply CDMA.

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