SSC General Science & Technology Sample Paper NCERT Sample Paper-7

  • question_answer
    Which one of the following channels is used by the Wi MAX for the uplink and downlink in the mobile telecommunications?

    A)  Frequency Division Multiple Access (FDMA)

    B)  Orthogonal Frequency   Division Multiple Access (OFDMA)

    C)  Code Division Multiple Access (CDMA)

    D)  Time Division Multiple Access (TDMA)

    Correct Answer: B

    Solution :

    [b] Orthogonal Frequency Division Multiplexing (OFDM) is a technique for transmitting large amounts of digital data over a radio wave. The technology works by splitting the radio signal into multiple smaller sub-signals that are then transmitted simultaneously at different frequencies to the receiver. OFDM reduces the amount of crosstalk in signal transmissions.

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