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    Baseband digital trnamission and multi level coding

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    A baseband digital data link transmits polar binary NRZ current pulses at a rate of 1.0 Msps. The link uses ideal RRC filters with roll off factor r = 0.5.

    a. Calculate the bandwidth occupied by the baseband binary signal.

    b. If the available channel bandwidth is 0.5 MHz, which of these can be used to transmit the digital data successfully?


    c. The E1 transmission system transmits voice signals using 8 bit words. What is the number of voice channels in an E1 frame?

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    Solution Preview

    a. Answer: 1.5 MHz

    Use occupied bandwidth B = (1+r)*SR where r is rolloff = 0.5, SR is Symbol Rate given as
    SR = 1.0 Msps.

    b. Answer: 8-ASK

    Here we need to squeeze up the BW used by a factor of ...

    Solution Summary

    A baseband digital signal is presented with NRZ pulses at 1 Mbps. The link uses RRC filters with rolloff of 0.5 and we go on to determine the bandwidth occuipied by the baseband binary signal. From this we are told that the link only has a bandwidth of 0.5 MHz so we go on to determine a suitable multi level modulation scheme to fit our bit rate. Finally E1 carriers are considered and the number of 8 bit words in an E1 carrier determined