Multiple access techniques

TDMA is a multiple access technique that has

• Different users in different time slots

• Each user is assigned unique frequency slots

• Each user is assigned a unique code sequence

• Each signal is modulated with frequency modulation technique

TDMA allows the user to have

• Use of same frequency channel for same time slot

• Use of same frequency channel for different time slot

• Use of same time slot for different frequency channel

• Use of different time slot for different frequency channels

GSM is an example of

• TDMA cellular systems

• FDMA cellular systems

• CDMA cellular systems

• SDMA cellular systems

Preamble contains ________

• Address

• Data

• Guard bits

• Trail bits

__________ are utilized to allow synchronization of the receivers between different slots and frames.

• Preamble

• Data

• Guard bits

• Trail bits

Because of _______ transmissions in TDMA, the handoff process in __________

• Continuous, complex

• Continuous, simple

• Discontinuous, complex

• Discontinuous, simple

_________ synchronization overhead is required in TDMA due to _______ transmission.

• High, burst

• High, continuous

• Low, burst

• No, burst

A TDMA system uses 25 MHz for the forward link, which is broken into radio channels of 200 kHz. If 8 speech channels are supported on a single radio channel, how many simultaneous users can be accommodated?

• 25

• 200

• 1600

• 1000

What is the time duration of a bit if data is transmitted at 270.833 kbps in the channel?

• 270.833 s

• 3 μs

• 3.692 μs

• 3.692 s

_______ of TDMA system is a measure of the percentage of transmitted data that contains information as opposed to providing overhead for the access scheme.

• Efficiency

• Figure of merit

• Signal to noise ratio

• Mean