Quiz 1: Basics of Wireless Communication

The RF channel in a radio transmitter produces

• High frequency carrier waves

• Both audio signal and high frequency carrier waves

• Low frequency carrier waves

• Audio signals

In a communications system, noise is most likely to affect the signal

• at the transmitter

• in the channel

• in the information source

• at the destination

Indicate the false statement. Modulation is used to

• reduce the bandwidth used

• separate differing transmissions

• ensure that intelligence may be transmitted over long distances

• allow the use of practicable antennas

Indicate the false statement. From the transmitter the signal deterioration because of noise is usually

• unwanted energy

• predictable in character

• present in the transmitter

• due to any cause

Amplitude modulation is the process of

• superimposing a low frequency on a high frequency

• superimposing a high frequency on a low frequency

• carrier interruption

• frequency shift and phase shift

The baud rate

• is always equal to the bit transfer rate

• is equal to twice the bandwidth of an ideal channel

• is not equal to the signaling rate

• is equal to one-half the bandwidth of an ideal channel

A forward error-correcting code corrects errors by

• requiring partial retransmission of the signal

• requiring retransmission of the entire signal

• requiring no part of the signal to be retransmitted

• using parity to correct the errors in all cases

Full duplex operation

• requires two pairs of cables

• can transfer data in both directions at once

• requires modems at both ends of the circuit

• all of the above

The data transmission rate of a modem is measured in

• bytes per second

• baud rate

• bits per second

• megahertz

Which of the steps is not included in the process of reception?

• decoding

• encoding

• storage

• interpretation