ECET 375 week 2 homework

ECET 375 week 2 homework

Ch2:10 – Define frequency Spectrum and bandwidth
Frequency spectrum is the wide range of frequencies found in the Frequency domain.
Bandwidth is the specific start and stop of the allowable frequency range.
Ch2:11 – Define electrical noise
Defined as any undesirable electrical energy that falls within the passband of a signal.
Ch2:12 – Give a brief description of the following forms of electrical noise; man-made, thermal, correlated and impulse
Man-made: noise that is produced by device.
Thermal: is the rapid and random movement of electrons agitating and is present in all electronic components and communications systems.
Correlated: noise that is mutually to the signal and must not be present in a circuit.
Impulse - are high-amplitude peaks of short duration in the total noise spectrum.

Ch2:16 – Brief describe the significant of the Shannon limit for information capacity.
Shannon limit indicates that the higher the signal to noise the better the BER.

Ch2:17 – What is meant by the M-ary encoding?
M-ary comes from the term "binary", but M represents a digit concerning the number of conditions, levels, or combinations possible for a given number of binary variables.

Ch5:1 – Contrast the advantage and disadvantage of digital transmission
Advantages: offer noise immunity, processing and combining using multiplexing, resistant to additive noise, and easier to measure and evaluate than analog signals.
Disadvantages: requires more bandwidth, requires additional encoding and decoding circuitry, requires precise clock synchronization between transmitters and receivers, and are incompatible with older analog transmission systems.

Ch5:2 – list and briefly describe the four most common methods of pulse transmission
PWM: Pulse width modulation. The width of the pulse corresponds to the amplitude of the analog signal it represents.
PPM: Pulse position modulation. Width of pulse is constant, but it's position within a prescribed time slot...

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