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A baseband link is equipped with an equalizer such that its operating bandwidth is 1.00 MHz. Over this bandwidth the attenuation is constant at 25 dB and the phase shift is linear with frequency. The link is used for the transmission of digital signals. The transmitter and receiver have ideal RRC filters with roll off factor r = 1.0. The transmitter pulses are binary ASK using on-off keying (OOK).

a. What is maximum pulse rate (i.e. symbol rate) for this link?

b. What is the bit rate of the signal?

c. If the filters in the transmitter and receiver are changed for ideal RRC filters with roll off factor r = 0.25, what is the maximum symbol rate for this link?

d. The transmission line has an impedance of 600 ohms and is terminated in a load of 600 ohms. The transmitter delivers an average power of 0.1 W to the input of the line. What is average power at the receiving end of the line? What is the average voltage of the received pulses?

#### Solution Preview

Operating Bandwidth B = 1 MHz

Filter roll off factor r = 1 or (100%)

a. Symbol Rate SR is given in terms of the Operating (or occupied) Bandwidth and the filter roll off factor by (1).

SR = B/(1+r) (1)

SR = 1 MHz/(1+1) = 500 KSymbols/s

b. For an M level modulation scheme the number of bits/level or bits/symbol m is given by (2).

m = log2{M} (2)

As we are just considering ASK (OOK) which is an M = 2 level scheme then the number of bits/symbol is just