# Tutorial6 - s 3 ( t ) = A sin(2 π f c t + 225 ° ) for...

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EE 3008 Bandpass DM Questions Part 2 Q1) A binary message m(t) = 1100 1100 1111 0010 0 transmitted using a DPSK transmitter. Find the auxiliary bit stream b(t) generated by the transmitter. (Assuming starting with 1 and using the rule that same 1, different 0.) Q2) Consider a communication channel with a bandwidth of 2400Hz. If QPSK technique is used, what is the possible transmission rate? (Assume that rectangular pulses are used in the baseband signals, and that 90% energy preservation is required.) Q3) Consider a QPSK modulated system with the four possible symbols represented by s 1 ( t ) = A sin(2 π f c t + 45 ° ) for “11”; s 2 ( t ) = A sin(2 π f c t + 135 ° ) for “10”;
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Unformatted text preview: s 3 ( t ) = A sin(2 π f c t + 225 ° ) for “00”; s 4 ( t ) = A sin(2 π f c t + 315 ° ) for “01”. Suppose the data sequence “1101100001” is transmitted at a speed of 100,000 bits/sec with a carrier frequency f c = 150 kHz. (i) Plot the transmitted signal with respect to time t . (ii) Express the four symbols as the addition of the in-phase component (a sin function) and the quadrature component (a cos function), and draw a constellation to represent the four symbols. (iii) Based on (ii), show that the QPSK signal in (i) can be expressed by the addition of two BPSK signals. Plot these two BPSK signals....
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## This note was uploaded on 01/11/2011 for the course EE 3008 taught by Professor Pingli during the Fall '08 term at City University of Hong Kong.

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