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Modulating Radio Frequency Carriers to Carry Digital Data

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Digital radio transmission requires the use of a carrier wave which is modulated by the digital data.
a. What are the three possible ways in which a radio frequency carrier can be modulated to carry
digital data?
b. Write down the equation for the occupied bandwidth of a digital band pass (radio) link that
has ideal RRC filters with alpha = 0.4 and a symbol rate Rs sps.
c. A digital radio link uses BPSK modulation and has a bit rate of 38.4 kbps. If the transmitter
and receiver have ideal RRC filters with alpha = 0.4, what is the bandwidth occupied by the RF
signal?
d. What is the RF bandwidth required by the radio link specified in part (c) above?

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Solution Preview

a. What are the three possible ways in which a radio frequency carrier can be modulated to carry digital data?

There are 3 components of a radio frequency carrier wave that can be modulated (shaped) to convey information:

(1) The amplitude of the carrier can be shaped or modulated by the information signal to convey the information. This is know as Amplitude Modulation (AM). There exists many types of AM depending on whether the modulating signal is analogue or digital in nature and the bandwidth used

(2) The frequency of the carrier can be shaped or modified by the modulating signal to convey ...

Solution Summary

The expert examines modulating radio frequency carriers to carry digital data.

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