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Ten voice signals are to be multiplexed and transmitted. The analog signal occupies 4 kHz of bandwidth and can be digitized using a vocoder at 12 kb/s. Calculate the required bandwidth for each of the following possibilities.
(a) FDMA using analog FM with 12 kHz deviation (use Carson's rule to find the bandwidth for one signal). Ignore guard bands between channels.
(b) FDMA using SSBSC AM. Ignore guard bands.
(c) TDM using GMSK. Assume a noiseless channel.
(d) TDMA using QPSK. Assume a noiseless channel.
(e) CDMA using frequency-hopping with 10 available channels. Use GMSK and assume a noiseless channel.
(f) CDMA using direct-sequence, QPSK with a chipping rate of 10:1.
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