Wireless Communication Networks Quiz

<p>To radiate and receive electromagnetic waves that carry information.</p> Signup and view all the answers

<p>To map digital data to analog signals.</p> Signup and view all the answers

<p>Channel capacity</p> Signup and view all the answers

<p>C=2B for binary signals and C=2B log2 M for multilevel signaling, where M is the number of discrete signal levels.</p> Signup and view all the answers

<p>To allow multiple signals to be carried on a single transmission medium.</p> Signup and view all the answers

<p>To use several antennas at the receiver and transmitter to increase data rates and transmission range.</p> Signup and view all the answers

<p>Analog signals are continuous time and continuous values, while digital signals are discrete time and discrete values.</p> Signup and view all the answers

<p>To protect against narrow band interference by spreading the narrow band signal into a broad band signal using a special code.</p> Signup and view all the answers

<p>DSSS involves XOR of the signal with a pseudo-random number (chipping sequence) and requires precise power control, while FHSS involves discrete changes of carrier frequency and has two versions: fast hopping and slow hopping.</p> Signup and view all the answers

<p>Channel capacity</p> Signup and view all the answers

<p>C=2B for binary signals and C=2B log2 M for multilevel signaling, where M is the number of discrete signal levels.</p> Signup and view all the answers

<p>Allows multiple signals to be carried on a single transmission medium.</p> Signup and view all the answers

<p>To transmit and receive signals.</p> Signup and view all the answers

<p>To map digital data to analog signals.</p> Signup and view all the answers

<p>Uses several antennas at the receiver and transmitter to increase data rates and transmission range.</p> Signup and view all the answers

<p>Analog signals are continuous time and continuous values, while digital signals are discrete time and discrete values.</p> Signup and view all the answers

<p>To transfer composed signals into the frequency domain.</p> Signup and view all the answers

<p>DSSS involves XOR of the signal with a pseudo-random number (chipping sequence) and requires precise power control, while FHSS involves discrete changes of carrier frequency and has two versions: fast hopping and slow hopping.</p> Signup and view all the answers

<p>To protect against narrow band interference by spreading the narrow band signal into a broad band signal using a special code.</p> Signup and view all the answers

<p>To increase data rates and transmission range by using several antennas at the receiver and transmitter.</p> Signup and view all the answers

<p>Impairments like noise.</p> Signup and view all the answers

<p>FDMA allocates different frequency bands to different users, while TDMA assigns different time slots to different users.</p> Signup and view all the answers

<p>To use multiple closely spaced orthogonal sub-carriers to transmit a high-rate stream of data and mitigate the effects of narrow coherence bandwidth.</p> Signup and view all the answers

<p>Data rate, bandwidth, noise, and error rate.</p> Signup and view all the answers

<p>DSSS involves XOR of the signal with a pseudo-random number (chipping sequence) and requires precise power control, while FHSS involves discrete changes of carrier frequency and has two versions: fast hopping and slow hopping.</p> Signup and view all the answers

<p>Fourier transformation is used to transfer composed signals into the frequency domain.</p> Signup and view all the answers

<p>Antennas can be isotropic radiators, dipoles, directed, sectorized, or diverse. They differ in terms of their directivity, radiation pattern, and gain.</p> Signup and view all the answers

<p>Multiple-Input Multiple-Output (MIMO) uses several antennas at the receiver and transmitter to increase data rates and transmission range by exploiting spatial diversity.</p> Signup and view all the answers

<p>Channel capacity is the maximum rate at which data can be transmitted over a given communication path, and it is limited by impairments like noise. Key concepts related to it include data rate, bandwidth, noise, and error rate.</p> Signup and view all the answers

<p>Multiplexing allows multiple signals to be carried on a single transmission medium. Different types of multiplexing techniques include FDMA, TDMA, CDMA, OFDMA, SDMA, and PDMA. They differ in terms of how they allocate resources to different users.</p> Signup and view all the answers

<p>Shannon's capacity formula (C=B log2(1+SNR)) represents the theoretical maximum data rate that can be achieved but assumes white noise. It is used to calculate the maximum achievable data rate given a signal-to-noise ratio.</p> Signup and view all the answers

<p>Modulation techniques such as ASK, FSK, and PSK are used to map digital data to analog signals. They differ in terms of how they vary the amplitude, frequency, or phase of the carrier signal.</p> Signup and view all the answers

<p>Signal propagation can be affected by fading, shadowing, reflection, refraction, scattering, and diffraction, and can change over time and location due to mobility. These factors can impact the quality of the signal by introducing noise, interference, or attenuation.</p> Signup and view all the answers

<p>To transfer composed signals into the frequency domain.</p> Signup and view all the answers

<p>DSSS involves XOR of the signal with a pseudo-random number, while FHSS involves discrete changes of carrier frequency.</p> Signup and view all the answers

<p>To determine the maximum rate at which data can be transmitted over a given communication path.</p> Signup and view all the answers

<p>C = 2B log2(M)</p> Signup and view all the answers

<p>To allow multiple signals to be carried on a single transmission medium.</p> Signup and view all the answers

<p>FDMA assigns different time slots to different users, while TDMA allocates different frequency bands to different users.</p> Signup and view all the answers

<p>To use multiple closely spaced orthogonal sub-carriers to transmit a high-rate stream of data.</p> Signup and view all the answers

<p>To use multiple antennas at the receiver and transmitter to increase data rates and transmission range.</p> Signup and view all the answers

<p>To use multiple antennas at the receiver and transmitter to increase data rates and transmission range.</p> Signup and view all the answers

<p>Periodic signals have parameters such as period, frequency, amplitude, and phase shift. Frequency is the reciprocal of the period, while amplitude is the maximum deviation of the signal from its mean value. Phase shift determines the position of the signal in time.</p> Signup and view all the answers

<p>Fourier transformation is used to transfer composed signals into the frequency domain, where they can be analyzed and manipulated in terms of their spectral content. This is useful for signal processing, modulation, and demodulation.</p> Signup and view all the answers

<p>The two types of Spread Spectrum Technology are Direct Sequence Spread Spectrum (DSSS) and Frequency Hopping Spread Spectrum (FHSS). DSSS involves XOR of the signal with a pseudo-random number (chipping sequence) and requires precise power control. FHSS involves discrete changes of carrier frequency and has two versions: fast hopping and slow hopping.</p> Signup and view all the answers

<p>Antennas are used to transmit and receive electromagnetic signals in wireless communication networks. They can be isotropic radiators, dipoles, directed, sectorized, or diverse, and are chosen based on the application requirements.</p> Signup and view all the answers

<p>Modulation techniques are used to map digital data to analog signals, which can be transmitted over wireless communication networks. They include amplitude shift keying (ASK), frequency shift keying (FSK), and phase shift keying (PSK), among others.</p> Signup and view all the answers

<p>The maximum data rate that can be achieved in wireless communication networks is determined by the channel capacity, which is the maximum rate at which data can be transmitted over a given communication path, and is limited by impairments like noise. It is determined by parameters such as data rate, bandwidth, noise, and error rate.</p> Signup and view all the answers

<p>Multiplexing allows multiple signals to be carried on a single transmission medium, increasing the efficiency and capacity of wireless communication networks. Some of the techniques used include frequency division multiple access (FDMA), time division multiple access (TDMA), code division multiple access (CDMA), orthogonal frequency division multiple access (OFDMA), space division multiple access (SDMA), and polarization division multiple access (PDMA).</p> Signup and view all the answers

<p>Multiple-Input Multiple-Output (MIMO) uses several antennas at the receiver and transmitter to increase data rates and transmission range in wireless communication networks. It works by exploiting the spatial diversity of the wireless channel to transmit multiple independent data streams simultaneously.</p> Signup and view all the answers

<p>Signal propagation in wireless communication networks can be affected by fading, shadowing, reflection, refraction, scattering, and diffraction, among others. These factors can change over time and location due to mobility, and can have significant impacts on the quality of wireless communication.</p> Signup and view all the answers

<p>Direct Sequence Spread Spectrum (DSSS) and Frequency Hopping Spread Spectrum (FHSS)</p> Signup and view all the answers

<p>To protect against narrow band interference by spreading the narrow band signal into a broad band signal using a special code.</p> Signup and view all the answers

<p>C=2B for binary signals and C=2B log2 M for multilevel signaling, where M is the number of discrete signal levels.</p> Signup and view all the answers

<p>C=B log2(1+SNR)</p> Signup and view all the answers

<p>To allow multiple signals to be carried on a single transmission medium.</p> Signup and view all the answers

<p>Data rate, bandwidth, noise, and error rate</p> Signup and view all the answers

<p>FDMA allocates different frequency bands to different users, while TDMA assigns different time slots to different users.</p> Signup and view all the answers

<p>Multiple-Input Multiple-Output uses several antennas at the receiver and transmitter to increase data rates and transmission range.</p> Signup and view all the answers

<p>Fading, shadowing, reflection, refraction, scattering, and diffraction, and can change over time and location due to mobility.</p> Signup and view all the answers

<p>Fast hopping involves rapidly switching between frequencies in a pseudo-random sequence, while slow hopping involves changing frequencies less frequently and in a predetermined sequence.</p> Signup and view all the answers

<p>To protect against narrow band interference by spreading the narrow band signal into a broad band signal using a special code.</p> Signup and view all the answers

<p>The Shannon's capacity formula (C=B log2(1+SNR)) represents the theoretical maximum data rate that can be achieved but assumes white noise.</p> Signup and view all the answers

<p>Guided media are physical cables that transmit signals through a physical path, while unguided media are wireless signals that propagate through the air or vacuum.</p> Signup and view all the answers

<p>Data rate, bandwidth, noise, and error rate.</p> Signup and view all the answers

<p>Direct Sequence Spread Spectrum (DSSS) and Frequency Hopping Spread Spectrum (FHSS).</p> Signup and view all the answers

<p>To use several antennas at the receiver and transmitter to increase data rates and transmission range.</p> Signup and view all the answers

<p>Period, frequency, amplitude, and phase shift.</p> Signup and view all the answers

<p>To transmit and receive electromagnetic waves in specific directions and patterns.</p> Signup and view all the answers