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    BANNARI AMMAN INSTITUTE OF TECHNOLOGY SATHYAMANGALAM Department of ECE Class S5 ECE B Subject Code 11L501 Subject Digital Communication Prepared By Mr.C.Kamalanadhan,Mrs.P.Ramya Time: 75 Minutes Lesson. No 2 1. Content List: QPSK 2. Skills Addressed: Reading ,Writing ,Listening, Understanding, Drawing Mind Map, Analyzing   3. Objectives: 1.   To Understand the concept of QPSK and also know the probability and power spectra Of QPSK 4. Lesson Links:    Compare the difference between QPSK and BPSK    What are the advantages of QPSK 5. Alpha Breathing : (2 Mins) The three steps for alpha breathing are    Breathe in    Breathe out    Hold (Repeat the three steps for 8 times) 6. Evocation : (5 mins )   7. Introduction:( 20-25 mins) Attached as Power Point Presentation in Annexure  –   I QPSK.pdf  8. Brain Activation: (2 mins) Any one of the following activities like    Right brain activities    Solving puzzles    Brain GYM    Optical Illusions    Perpetual calendar recalling Puzz.ppt  9. Survey and Reading by students: (15-18 mins) Text book   :Simon Haykin, Communication Systems John Wiley, 2001 Page No: 354-361 For more questions Refer Annexure V 10. Discussion: ( 9 mins) The students will be asked to discuss the relevant topic among their team/other team/Faculty. The students those who have not taken part will be noted and kindle them to do. 11. Mind Map: (5-7 mins)  Refer Annexure-II  12. Summary: (5 mins) Refer Annexure-III 13. Gazing/Rote memory: (2 mins) Refer Annexure-IV 14. Assessment: Refer Annexure-V 15. Learning outcomes: By learning this topic the students will be able to understand Pass band data transmission and QPSK and it will help them to apply knowledge in real time applications . Annexure-III Summary    This modulation scheme is very important for developing concepts of two-dimensional I-Q modulations as well as for its practical relevance    In a sense, QPSK is an expanded version from binary PSK where in a symbol consists of two bits and two ortho normal basis functions are used.    A group of two bits is often called a ‘di    bit’. So, four di  bits are possible. Each symbol carries same energy Annexure IV Rote Memory Bandwidth requirement Signaling scheme Signal space diagram Annexure V Short Answers 1.   Draw the constellation diagram for QPSK Signaling scheme   2.   Compare the bandwidth efficiency BPSK and QPSK modulated signal   3.   Write The Formula To Calculate Bandwidth For QPSK      Higher order questions 1.   With the help of block diagram and relevant expressions/waveform explain QPSK Transmitter and Receiver 2.   Compare psd and bandwidth requirements of QPSK with that of BPSK 3.   Represent QPSK Signal in signal space and find distance between them what is the significance of the distance.  4.   Explain QPSK modulation scheme with constellation diagram  Multiple Choice Questions: 1.   The phase shift of QPSK when symbol change occurs a) 2π b) π c ) π/2 d) 3π/2  2.   If the baud rate is 400 for a QPSK signal, the bit rate is ________ bps A) 100 B) 400 C) 800 D) 1600 3.   How many carrier frequencies are used in QPSK?   A) 2 B) 1 C) 0 D) 5 4.   The constellation diagram of QPSK has ______ dots A) 2 B) 4 C)1 D) 0
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