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    • ( 1 ) Class of orthogonal spreading coded used in CDMA communication.

    • 1) Color code
    • 2) Walsh code
    • 3) PCS code
    • 4) CDMA
    • Discussion in forum
      Answer : 2) Walsh code
      Solution : Walsh codes are a set of perfectly orthogonal codes used to separate users on the downlink (DL) channel in CDMA systems (for example in CDMA2000, UMTS cellular standards etc.).








      discussion


      Answer : 2) Walsh code

    • ( 2 ) In a spread spectrum system, the tendency for a stronger signals to interfere with the reception of weaker signals

    • 1) near-far field
    • 2) near-far effect
    • 3) direct-sequence
    • 4) spread-spectrum
    • Discussion in forum
      Answer : 2) near-far effect
      Solution : The near-far problem is a condition in which a receiver captures a strong signal and thereby makes it impossible for the receiver to detect a weaker signal.








      discussion


      Answer : 2) near-far effect

    • ( 3 ) The bandwidth of WCDMA is __ times larger than CDMAone

    • 1) 4
    • 2) 5
    • 3) 6
    • 4) 7
    • Discussion in forum
      Answer : 1) 4
      Solution : The bandwidth of WCDMA is 4 times larger than CDMA








      discussion


      Answer : 1) 4

    • ( 4 ) When a signal from a mobile cellular unit drops below a certain level, what action occurs?

    • 1) The unit is "handed off" to a closer cell.
    • 2) The call is terminated.
    • 3) The MTSO increases power level.
    • 4) The cell site switches antenna.
    • Discussion in forum
      Answer : 1) The unit is "handed off" to a closer cell.
      Solution : The unit is "handed off" to a closer cell.








      discussion


      Answer : 1) The unit is "handed off" to a closer cell.

    • ( 5 ) Transmission of brief text messages, such as pages or e-mail, by cellular radio or PCS.

    • 1) SMS
    • 2) MMS
    • 3) paging
    • 4) raking
    • Discussion in forum
      Answer : 1) SMS
      Solution : Short message service is a mechanism of delivery of short messages over the mobile networks. It is a store and forward way of transmitting messages to and from mobiles. The message (text only) from the sending mobile is stored in a central short message center (SMS) which then forwards it to the destination mobile.








      discussion


      Answer : 1) SMS

    • ( 6 ) Cellular telephones use which operation?

    • 1) simplex
    • 2) half-duplex
    • 3) full-duplex
    • 4) triplex
    • Discussion in forum
      Answer : 3) full-duplex
      Solution : Cellular telephones use full-duplex operation








      discussion


      Answer : 3) full-duplex

    • ( 7 ) Transmission of data in two directions on a channel by using different time slots for each directions

    • 1) time-division multiplexing
    • 2) time-division multiple access
    • 3) time-division duplexing
    • 4) time-division
    • Discussion in forum
      Answer : 3) time-division duplexing
      Solution : Time division duplex (TDD) refers to duplex communication links where uplink is separated from downlink by the allocation of different time slots in the same frequency band. It is a transmission scheme that allows asymmetric flow for uplink and downlink data transmission. Users are allocated time slots for uplink and downlink transmission.








      discussion


      Answer : 3) time-division duplexing

    • ( 8 ) What is the frequency deviation of AMPS?

    • 1) 12 kHz
    • 2) 6 kHz
    • 3) 3 kHz
    • 4) 18 kHz
    • Discussion in forum
      Answer : 1) 12 kHz
      Solution : AMPS system uses frequency modulation with 12khz deviation.








      discussion


      Answer : 1) 12 kHz

    • ( 9 ) A transmit channel has a frequency of 837.6 MHz. The receive channel frequency is

    • 1) 729.6 MHz
    • 2) 837.6 MHz
    • 3) 867.6 MHz
    • 4) 882.6 MHz
    • Discussion in forum
      Answer : 4) 882.6 MHz
      Solution : A transmit channel has a frequency of 837.6 MHz. The receive channel frequency is 882.6 MHz








      discussion


      Answer : 4) 882.6 MHz

    • ( 10 ) What is the transmission rate of a GSM cellular system?

    • 1) 128 kbps
    • 2) 240 kbps
    • 3) 64 kbps
    • 4) 270 kbps
    • Discussion in forum
      Answer : 4) 270 kbps
      Solution : The transmission rate of a GSM cellular system is 270 kbps








      discussion


      Answer : 4) 270 kbps





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