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a) The information in 4 analog signals is to be multiplexed and transmitted over a telephone channel that has 400-3100 Hz bandwidth. Each of the analog baseband signals is band-limited to 500 Hz. Design a communication system (block diagram) that will allow the transmission of these 4 sources over the telephone channel using:

i) Frequency division multiplexing with SSB (single sideband) subcarriers
ii) Time division multiplexing using PCM, assume 8-bit samples

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