What is defined as the weakening of signal amplitude as the signal passes through a medium?
Answer(s): C
Attenuation: Describes the progressive loss of signal strength as it travels through a medium (like air, cables, walls). It's caused by factors like absorption, distance, and obstacles.Other Phenomena:Diffraction: Bending of waves around obstacles.Reflection: Waves bouncing off surfaces.**Scattering: ** Waves dispersing in multiple directions.
Attenuation: https://en.wikipedia.org/wiki/Attenuation
How is ASK modulation different from FSK modulation?
Answer(s): A
Key Modulation Differences:ASK (Amplitude Shift Keying): Digital data is represented by changes in the amplitude (strength) of a carrier wave.FSK (Frequency Shift Keying): Digital data is represented by changes in the frequency of a carrier wave.
ASK: https://en.wikipedia.org/wiki/Amplitude-shift_keying FSK: https://en.wikipedia.org/wiki/Frequency-shift_keying
What does the number in the various Quadrature Amplitude Modulation levels, such as 16 in QAM- 16 and 64 in QAM-64, indicate? (Choose the single best answer.)
QAM Constellations: QAM (Quadrature Amplitude Modulation) uses a constellation diagram where points represent unique combinations of amplitude and phase. Bits per Symbol: The number in QAM-XX indicates the number of points:QAM-16: 16 points = 2^4 = 4 bits per symbolQAM-64: 64 points = 2^6 = 6 bits per symbolHigher Data Rates: More points in the constellation enable transmitting more bits per symbol, leading to higher data rates at the same bandwidth.
QAM: https://en.wikipedia.org/wiki/Quadrature_amplitude_modulation
What modulation is used by LoRa?
Answer(s): B
LoRa Modulation: LoRa (Long Range) is a proprietary wireless technology that utilizes Chirp Spread Spectrum (CSS) modulation.CSS Characteristics:Spread spectrum technique for resilience against interference. Chirps (frequency sweeps) enable operation below the noise floor for long range.
LoRa: https://en.wikipedia.org/wiki/LoRaChirp Spread Spectrum (CSS): https://en.wikipedia.org/wiki/Chirp_spread_spectrum
What primary component is required to implement a wireless transceiver in a device?
Answer(s): D
Wireless Transceiver: A transceiver is a combination of a transmitter and receiver used for wireless communication.Radio: The radio is the primary component responsible for:Modulation: Encoding data onto a carrier wave.Demodulation: Extracting data from a received signal.Transmission/Reception: Handling the actual sending and receiving of modulated signals over the air.
Transceiver: https://en.wikipedia.org/wiki/Transceiver
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