Question: Please help :) 1. A five-bit dataword can represent how many encoded symbols (i.e., A, B, C, 1, 2, 3, etc.)? a. 16 symbols b.
Please help :)
1. A five-bit dataword can represent how many encoded symbols (i.e., A, B, C, 1, 2, 3, etc.)?
| a. 16 symbols | ||
| b. 32 symbols | ||
| c. 64 symbols | ||
| d. 128 symbols |
2. Select the correct statement(s) regarding FDM and TDM.
| a. FDM and TDM are both identical in the way channels are aggregated; therefore their terms can be used interchangeably | ||
| b. FDM aggregates channels by separating each by time slots, whereas TDM aggregates channels by frequency | ||
| c. FDM separates channels in the frequency domain, whereas TDM separates time slots in the time domain | ||
| d. TDM requires guard channels in between information channels, whereas FDM does not require the use of guard channels |
3. A carrier wave has an amplitude of 2 volts, a frequency of 120 kHz, and -/2 radian phase angle. Select the correct carrier wave equation.
| a. c(t) = 2 cos(2*12kHz*t - ) | ||
| b. c(t) = 2cos(2*120E3Hz*t + ) | ||
| c. c(t) = 2cos(2*120E3Hz*t - 1.57) | ||
| d. None of the above are correct |
4.Select the true statement regarding Amplitude Modulation (AM).
| a. when using DSB-LC AM modulation, the frequency bandwidth is fm | ||
| b. both DSB-LC and DSB-SC have a frequency bandwidth of 2fm | ||
| c. SSB modulation provides the highest quality AM signal | ||
| d. there are no true statements |
5. Select the correct statement(s) regarding FM.
| a. FM is considered envelope modulation because the amplitude of the modulated carrier does not change with the message | ||
| b. AM is better than FM regarding noise rejection | ||
| c. Bessel functions are used to determine modulated carrier amplitudes in the time domain | ||
| d. all statements are correct |
6. Select the correct statement(s) regarding 4B5B.
| a. a four bit dataword is mapped to a 5 bit codeword; this results in only half of the possible codewords being mapped to legitimate datawords | ||
| b. 4B5B means that only 80% of the codeword represents information, with 20% representing overhead | ||
| c. 4B5B avoids long string of logical 1s and 0s, thus enabling use of simpler line coding techniques | ||
| d. all statements are correct |
7. With error control, n-k bits are added to a dataword (k-bits in length) to create a codeword (n-bits in length).
True
False
8.Select the true statement regarding error control algorithms.
| a. ARQ is solely an error detection algorithm | ||
| b. the concept of codeword and dataword is only applicable to error correction | ||
| c. CRC is an error detection method that requires the use of a shared polynomial between communicating nodes | ||
| d. PCM is a prime example of an error detection method |
9. Select the correct statement(s) regarding spread spectrum technologies.
| a. both direct sequence spread spectrum (DSSS) and frequency hopping spread spectrum (FHSS) results in the signal being spread over a wider frequency bandwidth | ||
| b. both direct sequence spread spectrum (DSSS) and frequency hopping spread spectrum (FHSS) requires a pseudorandom noise (PN) code and pseudorandom hop sequence, respectively, to be shared between transmitter and receiver | ||
| c. the transmit power requirements using DSSS and FHSS are the same as a narrow band transmission, even though DSSS and FHSS spreads the signal across a wider frequency spectrum | ||
| d. all statements are correct |
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