Q. A frequency hopped system does not provide security.

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Q. All users in CDMA system uses __________ carrier frequency.

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Q. ___________ problem occurs when many mobile users share the same channel.

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Q. In CDMA, symbol duration is ___________ than channel delay spread.

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Q. ____________ is used to improve reception by collecting time delayed versions of the required signal.

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Q. ____________ arises from the fact that the spreading sequences of different users are not orthogonal.

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Q. In ___________ technique, many subscribers attempt to access a single channel in an uncoordinated manner.

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Q. Packet radio uses _________ and __________ signals for perfect feedback.

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Q. Packet radio has high spectral efficiency.

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Q. ___________ is defined as average number of messages successfully transmitted per unit time in packet radio multiple access technique.

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Q. What is the time period during which the packets are susceptible to collisions with transmissions from other users?

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Q. For a PR multiple access technique, packet transmissions occur with __________ distribution.

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Q. If λ is mean arrival rate and τ is the packet duration, then traffic occupancy of a packet radio network is equal to _________

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Q. Pure ALOHA is __________

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Q. For pure ALOHA protocol, the vulnerable period is ___________ the packet duration.

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Q. The vulnerable period of slotted ALOHA is _________ packet duration.

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Q. In slotted ALOHA, time is divided into different length of time slots.

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Q. CSMA stands for _________

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Q. __________ is the time required for a terminal to sense whether or not the channel is idle.

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Q. Which of the following is based on time division multiplexing?

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