Unformatted text preview: d Vth = V /2.
3. [4 points]: For M = 1, what is the corresponding BER now? (You need not derive your answer
in detail; it will sufﬁce to explain what modiﬁcations you need to make to the earlier BERbipol
expression, and why.) BERonoﬀ = 4. [4 points]: For a given M and noise variance, by what factor does V in onoff signaling have to
be increased in order to get a BER that matches the case of bipolar signaling under the original V ? V must be increased by a factor of : 5. [2 points]: If V for onoff signaling is increased by the factor you determined in the preceding
problem, by what factor does the average power at the transmitter increase? Average power at the transmitter increases by : Page 4 of 17 6.02 Fall 2012, Quiz 2 6. [3 points]: Suppose (for either bipolar or onoff signaling) the probability of a “1” being sent
becomes greater than the probability of a “0” being sent. Will Vth have to be increased, decreased,
or left unchanged from its previous value for optimum performance, i.e., minimum BER? Circle the
correct answer, and e...
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This document was uploaded on 03/17/2014 for the course ELECTRICAL 6.02 at MIT.
 Fall '12
 GeorgeVerghese

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