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